MAX4475-MAX4489

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General DescriptionThe MAX4475MAX4478/MAX4488/MAX4489 wide-band, low-noise, low-distortion operational amplifiersoffer rail-to-rail outputs and single-supply operationdown to 2.7V. They draw 2.2mA of quiescent supplycurrent per amplifier while featuring ultra-low distortion(0.0002% THD+N), as well as low input voltage-noisedensity (4.5nV/Hz) and low input current-noise density(0.5fA/Hz). These features make the devices an idealchoice for applications that require low distortion and/orlow noise.

For power conservation, the MAX4475/MAX4488 offer alow-power shutdown mode that reduces supply currentto 0.01A and places the amplifiers outputs into a high-

impedance state. These amplifiers have outputs whichswing rail-to-rail and their input common-mode voltagerange includes ground. The MAX4475MAX4478 areunity-gain stable with a gain-bandwidth product of10MHz. The MAX4488/4489 are internally compensatedfor gains of +5V/V or greater with a gain-bandwidthproduct of 42MHz. The single MAX4475/MAX4476/MAX4488 are available in space-saving, 6-pin SOT23and TDFN packages.

ApplicationsADC Buffers

DAC Output Amplifiers

Low-Noise Microphone/Preamplifiers

Digital ScalesStrain Gauges/Sensor Amplifiers

Medical Instrumentation

Featureso Low Input Voltage-Noise Density: 4.5nV/Hzo Low Input Current-Noise Density: 0.5fA/Hzo Low Distortion: 0.0002% THD+N (1k load)o Single-Supply Operation from +2.7V to +5.5Vo Input Common-Mode Voltage Range Includes

Groundo Rail-to-Rail Output Swings with a 1k Loado 10MHz GBW Product, Unity-Gain Stable

(MAX4475MAX4478)o 42MHz GBW Product, Stable with AV +5V/V

(MAX4488/MAX4489)o Excellent DC Characteristics

VOS = 70VIBIAS = 1pALarge-Signal Voltage Gain = 120dB

o Low-Power Shutdown Mode:Reduces Supply Current to 0.01APlaces Output in High-Impedance State

o Available in Space-Saving SOT23, TDFN, MAX,and TSSOP Packages

MAX4475MAX

4478/MAX4488/MAX4489

SOT23, Low-Noise, Low-Distortion,Wide-Band, Rail-to-Rail Op Amps

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

Selector Guide

19-2137; Rev 5; 7/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxims website at www.maxim-ic.com.

Ordering Information continued at end of data sheet.

+Denotes a lead(Pb)-free/RoHS-compliant package.*EP = Exposed pad (connect to VSS).

/V denotes an automotive qualified part.T = Tape and reel.

Pin Configurations and Typical Operating Circuit appear at

end of data sheet.

PART TEMP RANGEPIN-

PACKAGE

TOP

MARK

MAX4475AUT+T -40C to +125C 6 SOT23 AAZV

MAX4475AUA+ -40C to +125C 8 MAX

MAX4475ASA+ -40C to +125C 8 SO

MAX4475ATT+T -40C to +125C 6 TDFN-EP* +ADD

MAX4475AUT/V+T -40C to +125C 6 SOT23 +ACQQ

PARTGAIN BW

(MHz)

STABLEGAIN(V/V)

NO. OFAMPS SHDN

MAX4475 10 1 1 Yes

MAX4476 10 1 1

MAX4477 10 1 2

MAX4478 10 1 4

MAX4488 42 5 1 Yes

MAX4489 42 5 2

25

20

10

5

010 1k 10k100 100k

INPUT VOLTAGE-NOISE DENSITYvs. FREQUENCY

MAX4475toc20

FREQUENCY (Hz)

15

VINEQUIVALENTINPUTNOISEVOLTAGE(nV/Hz)

Typical Operating Characteristic

MAX is a registered trademark of Maxim Integrated Products, Inc.

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MAX4475

MAX4478/MAX

4488/MAX4489


2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, SHDN= VDD, TA = -40C to +125C, unless otherwise noted.

Typical values are at TA = +25C.) (Notes 1, 2)

Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.

Power-Supply Voltage (VDD to VSS)......................-0.3V to +6.0VAnalog Input Voltage (IN_+, IN_-)....(VSS - 0.3V) to (VDD + 0.3V)SHDNInput Voltage....................................(VSS - 0.3V) to +6.0VOutput Short-Circuit Duration to Either Supply ..........ContinuousContinuous Input Current (IN+, IN-) .............................. ...10mAContinuous Power Dissipation (TA = +70C)

6-Pin SOT23 (derate 9.1mW/C above +70C)...........727mW6-Pin TDFN (derate 18.2mW/C above 70C)...........1454mW8-Pin MAX (derate 4.5mW/C above +70C) ............362mW8-Pin SO (derate 5.88mW/C above +70C)...............471mW

14-Pin SO (derate 8.33mW/C above +70C)..............667mW14-Pin TSSOP (derate 9.1mW/C above +70C) .........727mW

Operating Temperature Range .........................-40C to +125CJunction Temperature......................................................+150CStorage Temperature Range ........................... ..-65C to +150CLead Temperature (soldering, 10s) ............................ .....+300CSoldering Temperature (reflow)

SOT23, MAX, TSSOP, TDFN, and 8-Pin SO...............+260C14-Pin SO.....................................................................+240C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range VDD (Note 3) 2.7 5.5 V

VDD = 3V 2.2Normal mode

VDD = 5V 2.5 4.4mAQuiescent Supply Current Per

AmplifierID

Shutdown mode (SHDN= VSS) (Note 2) 0.01 1.0 A

TA = +25C 70 350Input Offset Voltage VOS

TA = -40C to +125C 750V

Input Offset Voltage Tempco TCVOS 0.3 6 V/C

Input Bias Current IB (Note 4) 1 150 pA

Input Offset Current IOS (Note 4) 1 150 pA

Differential Input Resistance RIN 1000 G

TA = +25C -0.2 VDD - 1.6Input Common-Mode VoltageRange

VCMGuaranteed by

CMRR Test TA = -40C to +125C -0.1 VDD - 1.7V

(VSS - 0.2V)

VCM (VDD -

1.6V)

TA = +25C 90 115

Common-Mode Rejection Ratio CMRR(VSS - 0.1V)

VCM (VDD -

1.7V)

TA = -40C to +125C 90

dB

Power-Supply Rejection Ratio PSRR VDD = 2.7 to 5.5V 90 120 dB

RL = 10k to VDD/2;VOUT= 100mV to (VDD- 125mV)

90 120

RL = 1k to VDD/2;

VOUT= 200mV to (VDD- 250mV)85 110Large-Signal Voltage Gain AVOL

RL = 500 to VDD/2;

VOUT= 350mV to (VDD- 500mV)85 110

dB

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MAX4475MAX

4478/MAX4488/MAX4489


_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, SHDN= VDD, TA = -40C to +125C, unless otherwise noted.

Typical values are at TA = +25C.) (Notes 1, 2)

AC ELECTRICAL CHARACTERISTICS(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, SHDN= VDD, TA = +25C.)


VDD- VOH 10 45|VIN+- VIN-| 10mV,

RL= 10k to VDD/2 VOL- VSS 10 40

VDD- VOH 80 200|VIN+- VIN-| 10mV,

RL= 1k to VDD/2 VOL- VSS 50 150

VDD- VOH 100 300

Output Voltage Swing VOUT

|VIN+- VIN-| 10mV,

RL= 500 to VDD/2 VOL- VSS 80 250

mV

Output Short-Circuit Current ISC 48 mA

Output Leakage Current ILEAKShutdown mode (SHDN= VSS),

VOUT = VSS to VDD0.001 1.0 A

SHDNLogic Low VIL 0.3 x VDD V

SHDNLogic High VIH 0.7 x VDD V

SHDNInput Current SHDN= VSS to VDD 0.01 1 A

Input Capacitance CIN 10 pF


MAX4475MAX4478 AV = +1V/V 10Gain-Bandwidth Product GBWP

MAX4488/MAX4489 AV = +5V/V 42MHz

MAX4475MAX4478 AV = +1V/V 3Slew Rate SRMAX4488/MAX4489 AV = +5V/V 10

V/s

MAX4475MAX4478 AV = +1V/V 0.4Full-Power Bandwidth (Note 5)

MAX4488/MAX4489 AV = +5V/V 1.25MHz

Peak-to-Peak Input Noise Voltage en(P-P) f = 0.1Hz to 10Hz 260 nVP-P

f = 10Hz 21

f = 1kHz 4.5Input Voltage-Noise Density en

f = 30kHz 3.5

nV/Hz

Input Current-Noise Density in f = 1kHz 0.5 fA/Hz

f = 1kHz 0.0002VOUT= 2VP-P,

AV= +1V/V

(MAX4475MAX4478),RL= 10k to GNDf = 20kHz 0.0007

f = 1kHz 0.0002VOUT= 2VP-P,

AV= +1V/V

(MAX4475MAX4478),

RL= 1k to GNDf = 20kHz 0.001

f = 1kHz 0.0004

Total Harmonic Distortion Plus

Noise (Note 6)THD + N

VOUT= 2VP-P,

AV= +5V/V

(MAX4488/MAX4489),


%

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4

2

10

8

6

12

14

16

18

-50 -30 -20-40 -10 0 10 20 30 40 50

INPUT OFFSET VOLTAGE DISTRIBUTION

MAX4475-

8toc1

VOS (V)

PERCENTAGE

OFUNITS(%)

0 -250

-100

-150

-200

0-50

200

150

100

50

250

-50 -25 0 25 50 75 100 125

OFFSET VOLTAGE vs. TEMPERATURE

MAX4475toc02

TEMPERATURE (C)

INPUTOFFSETVOLTAGE(V)

VCOM = 0V

0

10

30

20

40

50

-0.5 1.50.5 2.5 3.5 4.5

INPUT OFFSET VOLTAGE

vs. INPUT COMMON-MODE VOLTAGE

MAX4475toc03

INPUT COMMON-MODE VOLTAGE (V)

INPUTOFFSET

VOLTAGE(V)

VDD = 3V

VDD = 5V

Typical Operating Characteristics

(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, input noise floor of test equipment =10nV/Hz for all distortion

measurements, TA = +25C, unless otherwise noted.)

MAX4475

MAX4478/MAX

4488/MAX4489


4 _______________________________________________________________________________________

Note 1: All devices are 100% tested at TA = +25C. Limits over temperature are guaranteed by design.Note 2: SHDN is available on the MAX4475/MAX4488 only.Note 3: Guaranteed by the PSRR test.Note 4: Guaranteed by design.Note 5: Full-power bandwidth for unity-gain stable devices (MAX4475MAX4478) is measured in a closed-loop gain of +2V/V to

accommodate the input voltage range, VOUT = 4VP-P.

Note 6: Lowpass-filter bandwidth is 22kHz for f = 1kHz and 80kHz for f = 20kHz. Noise floor of test equipment = 10nV/Hz.


f = 1kHz 0.0005Total Harmonic Distortion Plus

Noise (Note 6)THD + N

VOUT= 2VP-P,

AV= +5V/V

(MAX4488/MAX4489),


%

Capacitive-Load Stability No sustained oscillations 200 pF

Gain Margin GM 12 dB

MAX4475MAX4478, AV = +1V/V 70Phase Margin M

MAX4488/MAX4489, AV = +5V/V 80degrees

Settling Time To 0.01%, VOUT = 2V step 2 s

Delay Time to Shutdown tSH 1.5 s

Enable Delay Time from Shutdown tEN VOUT = 2.5V, VOUT settles to 0.1% 10 s

Power-Up Delay Time VDD = 0 to 5V step, VOUT stable to 0.1% 13 s

AC ELECTRICAL CHARACTERISTICS (continued)(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, SHDN= VDD, TA = +25C.)

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Typical Operating Characteristics (continued)(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, input noise floor of test equipment =10nV/Hz for all distortion


MAX4475MAX

4478/MAX4488/MAX4489


_______________________________________________________________________________________ 5

0

0.05

0.10

0.15

0.20

0.25

0 4 52 31 6 7 8 9 10

OUTPUT VOLTAGE

vs. OUTPUT LOAD CURRENT

MAX4475toc04

OUTPUT LOAD CURRENT (mA)

OUTPUTVOLTAGE(V)

VDD - VOH

VOL

VDD = 3V OR 5VVDIFF = 10mV

0

20

10

40

30

60

50

70

-50 0 25-25 50 75 100 125

OUTPUT VOLTAGE SWING (VOH)

vs. TEMPERATURE

MAX4475toc05

TEMPERATURE (C)

VDD-

VOH(mV)

RL = 1k

RL = 10k

0

20

10

40

30

60

50

70

-50 0 25-25 50 75 100 125

OUTPUT VOLTAGE SWING (VOL)vs. TEMPERATURE

MAX4475toc06

TEMPERATURE (C)

VOL(mV)

RL = 1k

RL = 10k

50

60

70

80

90

100

110

120

130

0 50 100 150 200 250

LARGE-SIGNAL VOLTAGE GAIN

vs. OUTPUT VOLTAGE SWING

MAX4475toc07

VOUT SWING FROM EITHER SUPPLY (mV)

AV(dB)

RL = 200kRL = 20kRL = 2k

VDD = 3VRL REFERENCED TO GND

50

60

70

80

90

100

110

120

130

0 50 100 150 200 250



MAX4475toc08


AV(dB)

RL = 200kRL = 20k

RL

= 2k

VDD = 3VRL REFERENCED TO VDD

50

60

70

80

90

100

110

120

130

0 50 100 150 200 250



MAX4475toc09


AV(dB)

RL = 200k

RL = 20kRL = 2k

VDD = 5VRL REFERENCED TO GND

50

60

70

80

90

100

110

120

130

0 50 100 150 200 250



MAX4475toc10


AV(dB)

RL = 200k

RL = 2kRL = 20k

VDD = 5VRL REFERENCED TO VDD

50

70

60

100

90

80

130

120

110

140

-50 0 25-25 50 75 100 125


vs. TEMPERATURE

MAX4475toc11

TEMPERATURE (C)

AVOL(dB)

RL = 100k

RL = 10k

VOUT = 150mV TO 4.75V0

1.0

0.5

2.0

1.5

2.5

3.0

-50 25 50-25 0 75 100 125

SUPPLY CURRENT vs. TEMPERATURE

MAX4475toc12

TEMPERATURE (C)

SUPPLYCURRENT

(mA)

PER AMPLIFIER

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MAX4475

MAX4478/MAX

4488/MAX4489


6 _______________________________________________________________________________________



0

1.0

0.5

2.0

1.5

2.5

3.0

2.5 3.5 4.03.0 4.5 5.0 5.5

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX4475toc13

SUPPLY VOLTAGE (V)

SUPPLYCURRENT(mA)

PER AMPLIFIER

0

1.0

0.5

2.0

1.5

2.5

3.0

0 21 3 4 5

SUPPLY CURRENT vs. OUTPUT VOLTAGE

MAX4475toc14

OUTPUT VOLTAGE (V)

SUPPLYCURRENT(mA)

VDD = 5V

VDD = 3V

-20

-15

-10

-5

0

5

10

15

20

2.5 3.53.0 4.0 4.5 5.0 5.5

INPUT OFFSET VOLTAGEvs. SUPPLY VOLTAGE

MAX4475toc15

SUPPLY VOLTAGE (V)

INPUTOFFSETVOLTAGE(V)

MAX4475MAX4478

GAIN AND PHASE vs. FREQUENCY

INPUT FREQUENCY (Hz)

100 100k 1M 10M1k 10k 100M

GAIN(dB)

60

-40

-30

-20

-100

10

20

50

40

30

-180

PHA

SE(degrees)

180

-144

-108

-72-36

0

36

144

108

72

MAX4475 toc16

VDD = 3V OR 5VRL = 50kCL = 20pF

AV = +1000V/V

GAIN

PHASE

MAX4488/MAX4489GAIN AND PHASE vs. FREQUENCY

INPUT FREQUENCY (Hz)

100 100k 1M 10M1k 10k 100M

GAIN(dB)

60

-40

-30

-20

-100

10

20

50

40

30

-180

PHA

SE(degrees)

180

-144

-108

-72-36

0

36

144

108

72

MAX4475 toc17

VDD = 3V OR 5VRL = 50kCL = 20pFAV = +1000V/V

GAIN

PHASE

1000 100,000-130

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

0

0.001 0.1 10

MAX4475MAX4478POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

MAX4475toc18

FREQUENCY (kHz)

VDD = 3V OR 5V1000

100

10

1

0.1

0.01

1 100 1k10 10k

OUTPUT IMPEDANCE vs. FREQUENCY

MAX4475toc19

FREQUENCY (Hz)

OUTPUTIMPEDANC

E()

AV = +5

AV = +1

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MAX4475MAX

4478/MAX4488/MAX4489


_______________________________________________________________________________________ 7

25

20

10

5

010 1k 10k100 100k

INPUT VOLTAGE-NOISE DENSITYvs. FREQUENCY

MAX4475toc20

FREQUENCY (Hz)

15

VINEQUIVALENTINPUTNOISEVOLTAGE(nV/Hz)

1s/div

0.1Hz TO 10HzP-P NOISE

VDD = 3V OR 5VVP-P NOISE = 260nVP-P

200nV/div

MAX4475 toc21

MAX4475

TOTAL HARMONIC DISTORTION PLUS NOISEvs. OUTPUT VOLTAGE SWING

MAX4475toc22

OUTPUT VOLTAGE (VP-P)

THD+N(%)

10

0.0001

0.001

0.01

0.1

1

0 21 3 4

fO = 20kHz, FILTER BW = 80kHz

fO = 3kHz, FILTER BW = 30kHz

AV = +1RL = 100k

MAX4488/MAX4489

TOTAL HARMONIC DISTORTION PLUS NOISEvs. OUTPUT VOLTAGE SWING

OUTPUT VOLTAGE (VP-P)

0 21 3

THD

+N(%)

10

0.00001

0.0001

0.001

0.01

1

0.1

MAX4475toc23

VDD = +3V, fO = 20kHz

FILTER BW = 80kHz

VDD = 3V, fO = 3kHzFILTER BW = 30kHz

AV = +5RL = 100k

0.01

0.0001

0 10k 20k

MAX4488/MAX4489

TOTAL HARMONIC DISTORTIONPLUS NOISE vs. FREQUENCY

MAX4475toc24

FREQUENCY (Hz)

THD+N(%)

0.001

5k 15k

FILTER BW = 22kHzRL = 10k TO GNDR1 = 5.6k, R2 = 53kVOUT = 2VP-P

AV

= +10, VDD

= 3V

AV = +10, VDD = 5V

0.01

0.001

0 20k

MAX4475MAX4478TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

MAX4475toc25

FREQUENCY (Hz)

TH

D+N(%)

5k 10k 15k

FILTER BW = 80kHzVOUT = 2VP-PAV = +1RL = 1k

RL TO VDD/2 RL TO GND

RL TO VDD

1

0.0001

0 5k 15k 20k

MAX4488/MAX4489TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

0.001

0.01

0.1

MAX4475toc26

FREQUENCY (Hz)

THD+N(%)

10k

FILTER BW = 80kHzRL = 10k TO GNDR1 = 2.43k, R2 = 10kVOUT = 2.75VP-P

AV = +5, VDD = 3V

AV = +5, VDD = 5V



1s/div

MAX4475MAX4478

LARGE-SIGNAL PULSE RESPONSE

VDD = 3V, RL = 10k, CL = 100pFVIN = 2V

0.5V

MAX4475 toc27

2.5V

4s/div

MAX4475MAX4478SMALL-SIGNAL PULSE RESPONSE

VDD = 3V, RL = 10k, CL = 100pFVIN = 100mV PULSE

0.5V

MAX4475 toc28

0.6V

20mV/di

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Pin Description

MAX4475

MAX4478/MAX

4488/MAX4489


8 _______________________________________________________________________________________



1s/div

MAX4488/MAX4489LARGE-SIGNAL PULSE RESPONSE

VDD = 3V, RL = 10k, CL = 50pFVIN = 20mV PULSE, AV = +5V/V

MAX4475 toc29

VOUT200mV/div

1s/div

MAX4488/MAX4489SMALL-SIGNAL PULSE RESPONSE

VDD = 3V, RL = 10k, CL = 50pFVIN = 20mV PULSE, AV = +5V/V

MAX4475 toc30

VOUT50mV/div

1.6V

1.5V

-20

-9010 1000100 100k 100M10M

MAX4477/MAX4478/MAX4489CROSSTALK vs. FREQUENCY

-60

-50

-40

-30MAX4475toc31

FREQUENCY (Hz)

CROSSTALK(dB)

10k 1M

-70

-80

PIN

MAX4475/MAX4488

MAX4475/MAX4488

MAX4476MAX4477/MAX4489

MAX4478

SOT23/TDFN SO/MAX SOT23/TDFN SO/MAX SO/TSSOP

NAME FUNCTION

1 6 1 1, 7 1, 7, 8, 14OUT, OUTA,

OUTB, OUTC,OUTD

Amplifier Output

2 4 2 4 11 VSSNegative Supply. Connectto ground for single-supply operation

3 3 3 3, 5 3, 5, 10, 12IN+, INA+,

INB+, INC+,IND+

Noninverting AmplifierInput

4 2 4 2, 6 2, 6, 9, 13IN-, INA-, INB-,

INC-, IND-Inverting Amplifier Input

6 7 6 8 4 VDD Positive Supply

5 8 SHDN

Shutdown Input. Connectto VDD for normaloperation (amplifier(s)enabled).

1, 5 5 N.C.No Connection. Notinternally connected.

EP (TDFNonly)

EP (TDFN

only) EP

Exposed Paddle. Connectto VSS.

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Detailed DescriptionThe MAX4475MAX4478/MAX4488/MAX4489 single-supply operational amplifiers feature ultra-low noiseand distortion. Their low distortion and low noise makethem ideal for use as preamplifiers in wide dynamic-range applications, such as 16-bit analog-to-digitalconverters (see Typical Operating Circuit). Their high-input impedance and low noise are also useful for sig-nal conditioning of high-impedance sources, such aspiezoelectric transducers.

These devices have true rail-to-rail ouput operation,drive loads as low as 1k while maintining DC accura-cy, and can drive capactive loads up to 200pF withoutoscillation. The input common-mode voltage range

extends from (VDD - 1.6V) to 200mV below the negativerail. The push-pull output stage maintains excellent DCcharacteristics, while delivering up to 5mA of current.

The MAX4475MAX4478 are unity-gain stable, whilethe MAX4488/MAX4489 have a higher slew rate andare stable for gains 5V/V. The MAX4475/MAX4488feature a low-power shutdown mode, which reducesthe supply current to 0.01A and disables the outputs.

Low DistortionMany factors can affect the noise and distortion that thedevice contributes to the input signal. The followingguidelines offer valuable information on the impact ofdesign choices on Total Harmonic Distortion (THD).

Choosing proper feedback and gain resistor values fora particular application can be a very important factorin reducing THD. In general, the smaller the closed-loop gain, the smaller the THD generated, especiallywhen driving heavy resistive loads. The THD of the partnormally increases at approximately 20dB per decade,as a function of frequency. Operating the device nearor above the full-power bandwidth significantlydegrades distortion.

Referencing the load to either supply also improves theparts distortion performance, because only one of theMOSFETs of the push-pull output stage drives the out-put. Referencing the load to midsupply increases theparts distortion for a given load and feedback setting.

(See the Total Harmonic Distortion vs. Frequency graphin the Typical Operating Characteristics.)

For gains 5V/V, the decompensated devicesMAX4488/MAX4489 deliver the best distortion perfor-mance, since they have a higher slew rate and providea higher amount of loop gain for a given closed-loopgain setting. Capacitive loads below 100pF do not sig-nificantly affect distortion results. Distortion perfor-mance is relatively constant over supply voltages.

MAX4475MAX

4478/MAX4488/MAX4489


_______________________________________________________________________________________ 9

CZ

RF

VOUT

VIN

RG

VOUT100mV/div

VIN100mV/div

100mV

0V

AV = +2RF = RG = 100k

2s/div

Figure 1. Adding Feed-Forward Compensation

Figure 2a. Pulse Response with No Feed-ForwardCompensation

VOUT

100mV/div

VIN100mV/div

AV = +2RF = RG = 100k

2s/div

Figure 2b. Pulse Response with 10pF Feed-ForwardCompensation

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MAX4475

MAX4478/MAX

4488/MAX4489


10 ______________________________________________________________________________________

Low Noise

The amplifiers input-referred noise-voltage density isdominated by flicker noise at lower frequencies, and bythermal noise at higher frequencies. Because the ther-mal noise contribution is affected by the parallel combi-nation of the feedback resistive network (RF || RG,Figure 1), these resistors should be reduced in caseswhere the system bandwidth is large and thermal noiseis dominant. This noise contribution factor decreases,however, with increasing gain settings.

For example, the input noise-voltage density of the cir-cuit with RF = 100k, RG = 11k (AV = +5V/V) isen = 14nV/Hz, en can be reduced to 6nV/Hz bychoosing RF = 10k, RG = 1.1k (AV = +5V/V), at theexpense of greater current consumption and potentially

higher distortion. For a gain of 100V/V with RF = 100k,RG = 1.1k, the en is still a low 6nV/Hz.

Using a Feed-Forward CompensationCapacitor, CZ

The amplifiers input capacitance is 10pF. If the resis-tance seen by the inverting input is large (feedbacknetwork), this can introduce a pole within the amplifiersbandwidth resulting in reduced phase margin.Compensate the reduced phase margin by introducinga feed-forward capacitor (CZ) between the invertinginput and the output (Figure 1). This effectively cancelsthe pole from the inverting input of the amplifier.Choose the value of CZ as follows:

CZ = 10 x (RF/ RG) [pF]

In the unity-gain stable MAX4475MAX4478, the use ofa proper CZ is most important for AV = +2V/V, andAV = -1V/V. In the decompensated MAX4488/MAX4489, CZ is most important for AV = +10V/V.Figures 2a and 2b show transient response both withand without CZ.

Using a slightly smaller CZ than suggested by the for-mula above achieves a higher bandwidth at theexpense of reduced phase and gain margin. As a gen-eral guideline, consider using CZ for cases where RG ||RF is greater than 20k (MAX4475MAX4478) orgreater than 5k (MAX4488/MAX4489).

Applications InformationThe MAX4475MAX4478/MAX4488/MAX4489 combinegood driving capability with ground-sensing input andrail-to-rail output operation. With their low distortion andlow noise, they are ideal for use in ADC buffers, med-ical instrumentation systems and other noise-sensitiveapplications.

Ground-Sensing and Rail-to-Rail Outputs

The common-mode input range of these devicesextends below ground, and offers excellent common-mode rejection. These devices are guaranteed not toundergo phase reversal when the input is overdriven(Figure 3).

Figure 4 showcases the true rail-to-rail output operation

of the amplifier, configured with AV = 5V/V. The outputswings to within 8mV of the supplies with a 10k load,making the devices ideal in low-supply voltage applica-tions.

Power Supplies and LayoutThe MAX4475MAX4478/MAX4488/MAX4489 operatefrom a single +2.7V to +5.5V power supply or from dualsupplies of 1.35V to 2.75V. For single-supply opera-tion, bypass the power supply with a 0.1F ceramic

VOUT2V/div

VIN2V/div

0V

AV = +1VDD = +5VRL = 10k

40s/div

VOUT1V/div

5V

0V

20s/div

Figure 3. Overdriven Input Showing No Phase Reversal

Figure 4. Rail-to-Rail Output Operation

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capacitor placed close to the VDD pin. If operating fromdual supplies, bypass each supply to ground.

Good layout improves performance by decreasing theamount of stray capacitance and noise at the op ampsinputs and output. To decrease stray capacitance, min-imize PC board trace lengths and resistor leads, and

place external components close to the op amps pins.Typical Application Circuit

The Typical Application Circuit shows the singleMAX4475 configured as an output buffer for theMAX5541 16-bit DAC. Because the MAX5541 has anunbuffered voltage output, the input bias current of theop amp used must be less than 6nA to maintain 16-bitaccuracy. The MAX4475 has an input bias current ofonly 150pA (max), virtually eliminating this as a source

of error. In addition, the MAX4475 has excellent open-loop gain and common-mode rejection, making this anexcellent ouput buffer amplifier.

DC-Accurate Lowpass FilterThe MAX4475MAX4478/MAX4488/MAX4489 offer aunique combination of low noise, wide bandwidth, and

high gain, making them an excellent choice for activefilters up to 1MHz. The Typical Operating Circuitshowsthe dual MAX4477 configured as a 5th orderChebyschev filter with a cutoff frequency of 100kHz.The circuit is implemented in the Sallen-Key topology,making this a DC-accurate filter.


Typical Application Circuit

0 to +2.5VOUTPUT

SHDN

84

CS

SCLK

DIN2

3SERIALINTERFACE

VDD

DGND

REF

OUT

AGND

+5V +2.5V +5V

7

6

U1

MAX5541ESA

U2

MAX4475AUA

Typical Operating Circuit

1

2

3

4

5

6

7

8

470pF

3.09k1%

3.83k1%

13.7k1%

7.87k1%

10.0k1%

10.0k1%

15.0k1%

7.15k1%

10.0k1%

0.1F

220pF

220pF

220pF

220pF

5V

MAX44771/2

MAX44771/2

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Ordering Information (continued)


______________________________________________________________________________________ 13

Chip InformationPROCESS: BiCMOS

PART TEMP RANGEPIN-

PACKAGE

TOP

MARK

MAX4476AUT+T -40C to +125C 6 SOT23 AAZX

MAX4476ATT+T -40C to +125C 6 TDFN-EP* +ADF




MAX4478AUD+ -40C to +125C 14 TSSOP

MAX4478AUD/V+ -40C to +125C 14 TSSOP

MAX4478ASD+ -40C to +125C 14 SO

MAX4488AUT+T -40C to +125C 6 SOT23 AAZW



MAX4488ATT+T -40C to +125C 6 TDFN-EP* +ADE


+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad (connect to VSS).

/V denotes an automotive qualified part.

T = Tape and reel.

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PACKAGE TYPE PACKAGE CODE OUTLINE NO.LAND

PATTERN NO.

6 SOT23 U6F-6 21-0058 90-0175

8 MAX U8-1 21-0036 90-0092

14 TSSOP U14-2 21-0066 90-0117

8 SO S8-4 21-0041

14 SO S14-4 21-0041

6 TDFN-EP T633-2 21-0137 90-0058

Package InformationFor the latest package outline information and land patterns, go towww.maxim-ic.com/packages. Note that a +, #, or - in thepackage code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the

package regardless of RoHS status.
http://pdfserv.maxim-ic.com/package_dwgs/21-0058.PDFhttp://pdfserv.maxim-ic.com/land_patterns/90-0175.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0036.PDFhttp://pdfserv.maxim-ic.com/land_patterns/90-0092.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0066.PDFhttp://pdfserv.maxim-ic.com/land_patterns/90-0117.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0041.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0041.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0137.PDFhttp://pdfserv.maxim-ic.com/land_patterns/90-0058.PDFhttp://www.maxim-ic.com/packageshttp://www.maxim-ic.com/packageshttp://www.maxim-ic.com/packageshttp://www.maxim-ic.com/packageshttp://pdfserv.maxim-ic.com/land_patterns/90-0058.PDFhttp://pdfserv.maxim-ic.com/land_patterns/90-0117.PDFhttp://pdfserv.maxim-ic.com/land_patterns/90-0092.PDFhttp://pdfserv.maxim-ic.com/land_patterns/90-0175.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0137.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0041.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0041.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0066.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0036.PDFhttp://pdfserv.maxim-ic.com/package_dwgs/21-0058.PDF

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Package Information (continued)For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a +, #, or - in thepackage code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the


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MAX4475

MAX4478/MAX

4488/MAX4489


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MAX4475

MAX4478/MAX

4488/MAX4489


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COMMON DIMENSIONS

SYMBOL MIN. MAX.

A 0.70 0.80

D 2.90 3.10

E 2.90 3.10

A1 0.00 0.05

L 0.20 0.40

PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e

PACKAGE VARIATIONS

0.25 MIN.k

A2 0.20 REF.

2.00 REF0.250.050.50 BSC2.300.1010T1033-1

2.40 REF0.200.05- - - -0.40 BSC1.700.10 2.300.1014T1433-1

1.500.10 MO229 / WEED-3

0.40 BSC - - - - 0.200.05 2.40 REFT1433-2 14 2.300.101.700.10

T633-2 6 1.500.10 2.300.10 0.95 BSC MO229 / WEEA 0.400.05 1.90 REF

T833-2 8 1.500.10 2.300.10 0.65 BSC MO229 / WEEC 0.300.05 1.95 REF

T833-3 8 1.500.10 2.300.10 0.65 BSC MO229 / WEEC 0.300.05 1.95 REF

2.300.10 MO229 / WEED-3 2.00 REF0.250.050.50 BSC1.500.1010T1033-2

0.250.05 2.00 REF10 0.50 BSC MO229 / WEED-32.300.101.500.10T1033MK-1

0.40 BSC - - - - 0.200.05 2.40 REFT1433-3F 14 2.300.101.700.10

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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 21

2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products Inc

Revision History

REVISION

NUMBER

REVISION

DATEDESCRIPTION

PAGES

CHANGED

4 12/09Added lead-free designations and an automotive part to the Ordering Information

and added input current spec in Absolute Maximum Ratingssection1, 2, 13

5 7/10 Added /V designation to the MAX4475 product and soldering temperature 1, 2

MAX4475-MAX4489

Documents

Transcript of MAX4475-MAX4489