Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to ... · General Description The MAX4012...
Transcript of Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to ... · General Description The MAX4012...
General DescriptionThe MAX4012 single, MAX4016 dual, MAX4018 triple,and MAX4020 quad op amps are unity-gain-stabledevices that combine high-speed performance with Rail-to-Rail outputs. The MAX4018 has a disable feature thatreduces power-supply current to 400µA and places itsoutputs into a high-impedance state. These devicesoperate from a 3.3V to 10V single supply or from ±1.65Vto ±5V dual supplies. The common-mode input voltagerange extends beyond the negative power-supply rail(ground in single-supply applications).These devices require only 5.5mA of quiescent supplycurrent while achieving a 200MHz -3dB bandwidth anda 600V/µs slew rate. These parts are an excellent solu-tion in low-power/low-voltage systems that require widebandwidth, such as video, communications, and instru-mentation. In addition, when disabled, their high-outputimpedance makes them ideal for multiplexing applications.The MAX4012 comes in a miniature 5-pin SOT23 and 8-pin SO package, while the MAX4016 comes in 8-pinµMAX® and SO packages. The MAX4018/MAX4020 areavailable in a space-saving 16-pin QSOP, as well as a14-pin SO.
ApplicationsSet-Top BoxesSurveillance Video SystemsBattery-Powered InstrumentsVideo Line DriverAnalog-to-Digital Converter InterfaceCCD Imaging SystemsVideo Routing and Switching Systems
____________________________Features♦ Low-Cost
♦ High Speed:200MHz -3dB Bandwidth (MAX4012)150MHz -3dB Bandwidth(MAX4016/MAX4018/MAX4020)30MHz 0.1dB Gain Flatness600V/µs Slew Rate
♦ Single 3.3V/5.0V Operation
♦ Rail-to-Rail Outputs
♦ Input Common-Mode Range Extends Beyond VEE
♦ Low Differential Gain/Phase: 0.02%/0.02°
♦ Low Distortion at 5MHz:-78dBc SFDR-75dB Total Harmonic Distortion
♦ High-Output Drive: ±120mA
♦ 400µA Shutdown Capability (MAX4018)
♦ High-Output Impedance in Off State (MAX4018)
♦ Space-Saving SOT23, SO, µMAX, or QSOPPackages
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________________________________________________________________ Maxim Integrated Products 1
VEE
IN-IN+
1 5 VCCOUT
MAX4012
SOT23-5
TOP VIEW
2
3 4
OUTIN+
N.C.VEE
1
2
8
7
N.C.
VCCIN-
N.C.
SO
3
4
6
5
MAX4012
Pin Configurations
RO50Ω
IN
VOUTZO = 50Ω
UNITY-GAIN LINE DRIVER(RL = RO + RTO)
RF24Ω
RTO50Ω
RTIN50Ω
MAX4012
Typical Operating Circuit
19-1246; Rev 3; 8/04
Ordering Information
Ordering Information continued at end of data sheet.
Pin Configurations continued at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
PARTTEMP
RANGEPIN-PACKAGE
5 SOT23-5MAX4012EUK-T -40°C to +85°C
TOPMARK
ABZP
8 SOMAX4012ESA -40°C to +85°C —
8 SOMAX4016ESA -40°C to +85°C —
8 µMAXMAX4016EUA -40°C to +85°C —
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS (VCC = 5V, VEE = 0, EN_ = 5V, RL = ∞ to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Supply Voltage (VCC to VEE) ..................................................12VIN_-, IN_+, OUT_, EN_ .....................(VEE - 0.3V) to (VCC + 0.3V)Output Short-Circuit Duration to VCC or VEE............. ContinuousContinuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C) ...........571mW8-Pin SO (derate 5.9mW/°C above +70°C) .................471mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) ............330mW14-Pin SO (derate 8.3mW/°C above +70°C) ...............667mW16-Pin QSOP (derate 8.3mW/°C above +70°C) ..........667mW
Operating Temperature Range ...........................-40°C to +85°CStorage Temperature Range .............................-65°C to +150°CLead Temperature (soldering, 10s) .................................+300°C
Guaranteed by CMRR test
(VEE - 0.2V) ≤ VCM ≤ (VCC - 2.25V)
Any channels for MAX4016/MAX4018/MAX4020
(Note 2)
(Note 2)
Differential mode (-1V ≤ VIN ≤ +1V)
CONDITIONS
µV/°C8TCVOSInput Offset VoltageTemperature Coefficient
mV4 20VOS
VVEE - VCC -0.20 2.25
VCMInput Common-Mode Voltage Range
Input Offset Voltage (Note 2)
dBAVOLOpen-Loop Gain (Note 2)
dB70 100CMRRCommon-Mode Rejection Ratio
mV±1Input Offset Voltage Matching
µA5.4 20IBInput Bias Current
µA0.1 20IOSInput Offset Current
kΩ70RINInput Resistance
UNITSMIN TYP MAXSYMBOLPARAMETER
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or at any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposureto absolute maximum rating conditions for extended periods may affect device reliability.
Common mode (-0.2V ≤ VCM ≤ +2.75V) MΩ3
0.25V ≤ VOUT ≤ 4.75V, RL = 2kΩ 61
0.5V ≤ VOUT ≤ 4.5V, RL = 150Ω 52 59
1.0V ≤ VOUT ≤ 4V, RL = 50Ω 57
VVOUTOutput Voltage Swing(Note 2)
RL = 2kΩ0.06
0.06
RL = 150Ω0.30
0.30
0.6 1.5
0.6 1.5
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEERL = 75Ω
RL = 75Ωto ground
1.1 2.0VCC - VOH
0.05 0.50VOL - VEE
±70 ±120
±150
8
Sinking or sourcing
ROUT
ISC
Open-Loop Output Resistance
Output Short-Circuit Current
ΩmA
mAOutput Current±60
RL = 20Ω to VCC orVEE
IOUTTA = +25°C
TA = TMIN to TMAX
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DC ELECTRICAL CHARACTERISTICS (continued)(VCC = 5V, VEE = 0, EN_ = 5V, RL = ∞ to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
VCC = 5V, VEE = 0, VCM = 2.0V
VCC = 5V, VEE = -5V, VCM = 0
VCC to VEE
CONDITIONS
dB
46 57
PSRRPower-Supply Rejection Ratio(Note 3)
54 66
V3.15 11.0VSOperating Supply-VoltageRange
UNITSMIN TYP MAXSYMBOLPARAMETER
VCC = 3.3V, VEE = 0, VCM = 0.90V 45
EN_ = 0, 0 ≤ VOUT ≤ 5V (Note 4) kΩ28 35ROUT (OFF)Disabled Output Resistance
VVCC - 2.6VILEN_ Logic-Low Threshold
VVCC - 1.6VIHEN_ Logic-High Threshold
0.5
EN_ = 5V µA0.5 10IIHEN_ Logic Input High Current
EnabledmA
5.5 7.0IS
Quiescent Supply Current (per Amplifier) MAX4018, disabled (EN_ = 0) 0.40 0.65
(VEE + 0.2V) ≤ EN_ ≤ VCCµA
200 400IILEN_ Logic Input Low Current
EN_ = 0
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Note 1: The MAX4012EUT is 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed bydesign.
Note 2: Tested with VCM = 2.5V.Note 3: PSR for single 5V supply tested with VEE = 0, VCC = 4.5V to 5.5V; for dual ±5V supply with VEE = -4.5V to -5.5V,
VCC = 4.5V to 5.5V; and for single 3.3V supply with VEE = 0, VCC = 3.15V to 3.45V.Note 4: Does not include the external feedback network’s impedance.Note 5: Guaranteed by design.
AC ELECTRICAL CHARACTERISTICS (VCC = 5V, VEE = 0, VCM = 2.5V, EN_ = 5V, RF = 24Ω, RL = 100Ω to VCC/2, VOUT = VCC/2, AVCL = 1, TA = +25°C, unless otherwisenoted.)
PARAMETER SYMBOL MIN TYP MAX UNITS
Bandwidth for 0.1dB GainFlatness
BW0.1dB 6 30 MHz
Large-Signal -3dB Bandwidth BWLS 140 MHz
Slew Rate SR 600 V/µs
Settling Time to 0.1% tS 45 ns
Rise/Fall Time tR, tF 1 ns
-78dBc
Small-Signal -3dB Bandwidth BWSS
200
MHz150
Harmonic Distortion HD-82
-75 dB
Two-Tone, Third-OrderIntermodulation Distortion
IP3 35 dBc
Input 1dB Compression Point 11 dBm
Differential Phase Error DP 0.02 degrees
Differential Gain Error DG 0.02 %
Input Noise-Voltage Density en 10 nV/√Hz
Input Noise-Current Density in 1.3 pA/√Hz
Input Capacitance CIN 1 pF
Disabled Output Capacitance COUT (OFF) 2 pF
Output Impedance ZOUT 6 ΩAmplifier Enable Time tON 100 ns
CONDITIONS
VOUT = 2VP-P
VOUT = 2V step
VOUT = 2V step
f1 = 10.0MHz, f2 = 10.1MHz, VOUT = 1VP-P
VOUT = 100mVP-P
fC = 5MHz, VOUT = 2VP-P
fC = 10MHz, AVCL = 2
NTSC, RL = 150ΩNTSC, RL = 150Ω
VOUT = 20mVP-P
f = 10kHz
f = 10kHz
MAX4018, EN_ = 0
f = 10MHz
MAX4018
MAX4012
MAX4016/MAX4018/MAX4020
VOUT = 20mVP-P (Note 5)
2nd harmonic
3rd harmonic
Total harmonic distortion
Spurious-Free DynamicRange
SFDR -78 dBcfC = 5MHz, VOUT = 2VP-P
Amplifier Disable Time tOFF 1 µsMAX4018
Amplifier Gain Matching 0.1 dBMAX4016/MAX4018/MAX4020,f = 10MHz, VOUT = 20mVP-P
Amplifier Crosstalk XTALK -95 dBMAX4016/MAX4018/MAX4020,f = 10MHz, VOUT = 2VP-P, RS = 50Ω to ground
4
-6100k 1M 10M 100M 1G
MAX4012SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = 1)
-4
MAX
4012
-01
FREQUENCY (Hz)
GAIN
(dB)
-2
0
2
3
-5
-3
-1
1
AVCL = 1VOUT = 20mVP-P
3
-7100k 1M 10M 100M 1G
MAX4016/MAX4018/MAX4020SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = 1)
-5
MAX
4012
-02
FREQUENCY (Hz)
GAIN
(dB)
-3
-1
1
2
-6
-4
-2
0
AVCL = 1VOUT = 20mVP-P
9
-1100k 1M 10M 100M 1G
MAX4012SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = 2)
1
MAX
4012
-03
FREQUENCY (Hz)
GAIN
(dB)
3
5
7
8
0
2
4
6
AVCL = 2VOUT = 20mVP-P
9
-1100k 1M 10M 100M 1G
MAX4016/MAX4018/MAX4020SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = 2)
1
MAX
4012
-04
FREQUENCY (Hz)
GAIN
(dB)
3
5
7
8
0
2
4
6
AVCL = 2VOUT = 20mVP-P
0.5
-0.50.1M 1M 10M 100M 1G
MAX4016/MAX4018/MAX4020GAIN FLATNESS vs. FREQUENCY
-0.3
MAX
4012
-07
FREQUENCY (Hz)
GAIN
(dB)
-0.1
0.1
0.3
0.4
-0.4
-0.2
0
0.2
AVCL = 1VOUT = 20mVP-P
4
-6100k 1M 10M 100M 1G
LARGE-SIGNAL GAIN vs. FREQUENCY
-4
MAX
4012
-05
FREQUENCY (Hz)
GAIN
(dB)
-2
0
2
3
-5
-3
-1
1
VOUT = 2VP-PVOUT BIAS = 1.75V
0.7
-0.30.1M 1M 10M 100M 1G
MAX4012GAIN FLATNESS vs. FREQUENCY
-0.1
MAX
4012
-06
FREQUENCY (Hz)
GAIN
(dB)
0.1
0.3
0.5
0.6
-0.2
0
0.2
0.4
AVCL = 1VOUT = 20mVP-P
50
-150100k 1M 10M 100M 1G
MAX4016/MAX4018/MAX4020CROSSTALK vs. FREQUENCY
-110
MAX
4212
-08
FREQUENCY (Hz)
CROS
STAL
K (d
B)
-70
-30
10
30
-130
-90
-50
-10
RS = 50Ω1000
0.10.1M 1M 10M 100M
CLOSED-LOOP OUTPUT IMPEDANCEvs. FREQUENCY
MAX
4012
-09
FREQUENCY (Hz)
IMPE
DANC
E (Ω
)
100
1
10
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Typical Operating Characteristics(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
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0
-100100k 1M 10M 100M
HARMONIC DISTORTION vs. FREQUENCY (AVCL = 1)
-80
MAX
4012
-10
FREQUENCY (Hz)
HARM
ONIC
DIS
TORT
ION
(dBc
)
-60
-40
-20
-10
-90
-70
-50
-30
VOUT = 2VP-PAVCL = 1
2ND HARMONIC
3RD HARMONIC
0
-100100k 1M 10M 100M
HARMONIC DISTORTION vs. FREQUENCY (AVCL = 2)
-80
MAX
4012
-11
FREQUENCY (Hz)
HARM
ONIC
DIS
TORT
ION
(dBc
)
-60
-40
-20
-10
-90
-70
-50
-30
VOUT = 2VP-PAVCL = 2
2ND HARMONIC
3RD HARMONIC
0
-100100k 1M 10M 100M
HARMONIC DISTORTION vs. FREQUENCY (AVCL = 5)
-80
MAX
4012
-12
FREQUENCY (Hz)
HARM
ONIC
DIS
TORT
ION
(dBc
)
-60
-40
-20
-10
-90
-70
-50
-30
VOUT = 2VP-PAVCL = 5
2ND HARMONIC
3RDHARMONIC
0
-10
-20
-30
-60
-70
-90
-80
-40
-50
-100
MAX
4012
-13
LOAD (Ω)0 200 400 600 800 1000
HARMONIC DISTORTION vs. LOAD
HARM
ONIC
DIS
TORT
ION
(dBc
)
f = 5MHzVOUT = 2VP-P
3rd HARMONIC
2rd HARMONIC
0
-100100k 1M 10M 100M
COMMON-MODE REJECTIONvs. FREQUENCY
-80
MAX
4012
-16
FREQUENCY (Hz)
CMR
(dB)
-60
-40
-20
-10
-90
-70
-50
-30
0
-10
-20
-30
-60
-70
-90
-80
-40
-50
-100
MAX
4012
-14
OUTPUT SWING (Vp-p)0.5 1.0 1.5 2.0
HARMONIC DISTORTION vs. OUTPUT SWING
HARM
ONIC
DIS
TORT
ION
(dBc
)
fO = 5MHz
3RD HARMONIC
2ND HARMONIC
-0.010 100
0 100
DIFFERENTIAL GAIN AND PHASE
-0.01
0.00
0.00
0.01
0.01
0.02
0.02
0.03
0.03
IRE
IRE
DIFF
. PHA
SE (d
eg)
DIFF
. GAI
N (%
)
MAX
4012
-15
VCM = 1.35V
VCM = 1.35V
20
-80100k 1M 10M 100M
POWER-SUPPLY REJECTIONvs. FREQUENCY
-60
MAX
4012
-17
FREQUENCY (Hz)
POW
ER-S
UPPL
Y RE
JECT
ION
(dB)
-40
-20
0
10
-70
-50
-30
-10
4.5
4.0
3.5
2.5
2.0
1.5
3.0
1.0
MAX
4012
-18
LOAD RESISTANCE (Ω)25 50 75 100 125 150
OUTPUT SWING vs. LOAD RESISTANCE
OUTP
UT S
WIN
G (V
p-p)
AVCL = 2
RL to VCC/2
RL to GROUND
Typical Operating Characteristics (continued)(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
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IN(50mV/
div)
OUT(25mV/
div)
VOLT
AGE
SMALL-SIGNAL PULSE RESPONSE(AVCL = 1)
MAX4012-19
20ns/divVCM = 2.5V, RL = 100Ω to GROUND
IN(25mV/
div)
OUT(25mV/
div)
VOLT
AGE
SMALL-SIGNAL PULSE RESPONSE(AVCL = 2)
MAX4012-20
20ns/divVCM = 1.25V, RL = 100Ω to GROUND
IN(50mV/
div)
OUT(25mV/
div)
VOLT
AGE
SMALL-SIGNAL PULSE RESPONSE (CL = 5pF, AVCL = 1)
MAX4012-21
20ns/divVCM = 1.75V, RL = 100Ω to GROUND
IN(1V/div)
OUT(1V/div)
VOLT
AGE
LARGE-SIGNAL PULSE RESPONSE(AVCL = 1)
MAX4012-22
20ns/divVCM = 1.75V, RL = 100Ω to GROUND
100
10
11 10 1k 10M1M
VOLTAGE-NOISE DENSITYvs. FREQUENCY
MAX
4012
-25
FREQUENCY (Hz)
VOLT
AGE-
NOIS
E DE
NSIT
Y
100 10k 100k
IN(500mV/
div)
OUT(500mV/
div)
VOLT
AGE
LARGE-SIGNAL PULSE RESPONSE(AVCL = 2)
MAX4012-23
20ns/divVCM = 0.9V, RL = 100Ω to GROUND
IN(1V/div)
OUT(500mV/
div)
VOLT
AGE
LARGE-SIGNAL PULSE RESPONSE (CL = 5pF, AVCL = 2)
MAX4012-24
20ns/divVCM = 1.75V, RL = 100Ω to GROUND
10
11 10 1k 10M1M
CURRENT-NOISE DENSITYvs. FREQUENCY
MAX
4012
-26
FREQUENCY (Hz)
CURR
ENT-
NOIS
E DE
NSIT
Y
100 10k 100k
EN_
5.0V (ENABLE)
0(DISABLE)
1V
0
OUT
ENABLE RESPONSE TIMEMAX4012-27
1µs/divVIN = 1.0V
Typical Operating Characteristics (continued)(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
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70
50
60
40
30
20
MAX
4012
-28
LOAD RESISTANCE (Ω)0 200 400 600 800 1k
OPEN-LOOP GAINvs. LOAD RESISTANCE
OPEN
-LOO
P GA
IN (d
B)
400
350
300
250
150
50
100
200
0
MAX
4012
-29
LOAD RESISTANCE (Ω)1000 200 500400300 600
CLOSED-LOOP BANDWIDTHvs. LOAD RESISTANCE
CLOS
ED-L
OOP
BAND
WID
TH (M
Hz)
10
-90100k 10M 100M1M
OFF-ISOLATION vs. FREQUENCY
-80
MAX
4012
-30
FREQUENCY (Hz)
OFF-
ISOL
ATIO
N (d
B)
-70
-60
-50
-40
-30
-20
-10
0
7
6
4
5
3
MAX
4012
-31
TEMPERATURE (°C)-25-50 0 755025 100
SUPPLY CURRENTvs. TEMPERATURE
SUPP
LY C
URRE
NT (m
A)
10
8
6
4
2
0
MAX
4012
-34
SUPPLY VOLTAGE (V)43 5 6 7 8 9 10 11
SUPPLY CURRENTvs. SUPPLY VOLTAGE
SUPP
LY C
URRE
NT (m
A)
6.0
5.5
4.5
5.0
4.0
MAX
4012
-32
TEMPERATURE (°C)-25-50 0 755025 100
INPUT BIAS CURRENTvs. TEMPERATURE
INPU
T BI
AS C
URRE
NT (µ
A)
0.20
0.16
0.12
0.04
0.08
0
MAX
4012
-33
TEMPERATURE (°C)-25-50 0 755025 100
INPUT OFFSET CURRENTvs. TEMPERATURE
INPU
T OF
FSET
VOL
TAGE
5
4
3
1
2
0
MAX
4012
-35
TEMPERATURE (°C)-25-50 0 755025 100
INPUT OFFSET VOLTAGEvs. TEMPERATURE
INPU
T OF
FSET
VOL
TAGE
(mV)
5.0
4.8
4.6
4.2
4.4
4.0
MAX
4012
-36
TEMPERATURE (°C)-25-50 0 755025 100
OUTPUT VOLTAGE SWINGvs. TEMPERATURE
OUTP
UT V
OLTA
GE S
WIN
G (V
p-p)
RL = 150Ω TO VCC/2
Typical Operating Characteristics (continued)(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
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Pin Description
PIN
MAX4012 MAX4012 MAX4018 MAX4020
SO-8 SOT23
MAX4016SO/µMAX
SO QSOP SO QSOP
NAME FUNCTION
1, 5, 8 — — — 8, 9 — 8, 9 N.C.No Connection. Not internally connected. Tieto ground or leave open.
6 1 — — — — — OUT Amplifier Output
4 2 4 11 13 11 13 VEENegative Power Supply or Ground (in single-supply operation)
3 3 — — — — — IN+ Noninverting Input
2 4 — — — — — IN- Inverting Input7 5 8 4 4 4 4 VCC Positive Power Supply
— — 1 7 7 1 1 OUTA Amplifier A Output— — 2 6 6 2 2 INA- Amplifier A Inverting Input
— — 3 5 5 3 3 INA+ Amplifier A Noninverting Input— — 7 8 10 7 7 OUTB Amplifier B Output
— — 6 9 11 6 6 INB- Amplifier B Inverting Input— — 5 10 12 5 5 INB+ Amplifier B Noninverting Input— — — 14 16 8 10 OUTC Amplifier C Output
— — — 13 15 9 11 INC- Amplifier C Inverting Input— — — 12 14 10 12 INC+ Amplifier C Noninverting Input
— — — — — 14 16 OUTD Amplifier D Output— — — — — 13 15 IND- Amplifier D Inverting Input
— — — — — 12 14 IND+ Amplifier D Noninverting Input— — — — — — — EN Enable Amplifier
— — — 1 1 — — ENA Enable Amplifier A— — — 3 3 — — ENB Enable Amplifier B
— — — 2 2 — — ENC Enable Amplifier C
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20 Detailed Description
The MAX4012/MAX4016/MAX4018/MAX4020 are sin-gle-supply, rail-to-rail, voltage-feedback amplifiers thatemploy current-feedback techniques to achieve600V/µs slew rates and 200MHz bandwidths. Excellentharmonic distortion and differential gain/phase perfor-mance make these amplifiers an ideal choice for a widevariety of video and RF signal-processing applications.
The output voltage swing comes to within 50mV of eachsupply rail. Local feedback around the output stageassures low open-loop output impedance to reducegain sensitivity to load variations. This feedback alsoproduces demand-driven current bias to the outputtransistors for ±120mA drive capability, while constrain-ing total supply current to less than 7mA. The inputstage permits common-mode voltages beyond the nega-tive supply and to within 2.25V of the positive supply rail.
Applications InformationChoosing Resistor Values
Unity-Gain ConfigurationThe MAX4012/MAX4016/MAX4018/MAX4020 are inter-nally compensated for unity gain. When configured forunity gain, the devices require a 24Ω resistor (RF) inseries with the feedback path. This resistor improvesAC response by reducing the Q of the parallel LC cir-
cuit formed by the parasitic feedback capacitance andinductance.
Inverting and Noninverting ConfigurationsSelect the gain-setting feedback (RF) and input (RG)resistor values to fit your application. Large resistor val-ues increase voltage noise and interact with the amplifi-er’s input and PC board capacitance. This cangenerate undesirable poles and zeros and decreasebandwidth or cause oscillations. For example, a nonin-verting gain-of-two configuration (RF = RG) using 1kΩresistors, combined with 1pF of amplifier input capaci-tance and 1pF of PC board capacitance, causes a poleat 159MHz. Since this pole is within the amplifier band-width, it jeopardizes stability. Reducing the 1kΩ resis-tors to 100Ω extends the pole frequency to 1.59GHz,but could limit output swing by adding 200Ω in parallelwith the amplifier’s load resistor. Table 1 shows sug-gested feedback, gain resistors, and bandwidth forseveral gain values in the configurations shown inFigures 1a and 1b.
Layout and Power-Supply BypassingThese amplifiers operate from a single 3.3V to 11V powersupply or from dual supplies to ±5.5V. For single-supplyoperation, bypass VCC to ground with a 0.1µF capacitoras close to the pin as possible. If operating with dual sup-plies, bypass each supply with a 0.1µF capacitor.
Low-Cost, High-Speed, Single-SupplyOp Amps with Rail-to-Rail Outputs
10 ______________________________________________________________________________________
IN
RG
VOUT = [1+ (RF / RG)] VIN
RF
RTO
RTIN
RO
VOUTMAX40_ _
INRG
VOUT = -(RF / RG) VIN
RF
RTO
RS
RTIN
RO
VOUTMAX40_ _
Figure 1a. Noninverting Gain Configuration Figure 1b. Inverting Gain Configuration
Maxim recommends using microstrip and stripline tech-niques to obtain full bandwidth. To ensure that the PCboard does not degrade the amplifier’s performance,design it for a frequency greater than 1GHz. Pay care-ful attention to inputs and outputs to avoid large para-sitic capacitance. Whether or not you use a constant-impedance board, observe the following guidelineswhen designing the board:
• Don’t use wire-wrap boards because they are tooinductive.
• Don’t use IC sockets because they increase parasiticcapacitance and inductance.
• Use surface-mount instead of through-hole compo-nents for better high-frequency performance.
• Use a PC board with at least two layers; it should beas free from voids as possible.
• Keep signal lines as short and as straight as possi-ble. Do not make 90° turns; round all corners.
Rail-to-Rail Outputs, Ground-Sensing Input
The input common-mode range extends from (VEE - 200mV) to (VCC - 2.25V) with excellent common-mode rejection. Beyond this range, the amplifier outputis a nonlinear function of the input, but does not under-go phase reversal or latchup.
The output swings to within 60mV of either power-supply rail with a 2kΩ load. The input ground-sensingand the rail-to-rail output substantially increase thedynamic range. With a symmetric input in a single 5Vapplication, the input can swing 2.95VP-P, and the out-put can swing 4.9VP-P with minimal distortion.
Enable Input and Disabled OutputThe enable feature (EN_) allows the amplifier to beplaced in a low-power, high-output-impedance state.Typically, the EN_ logic low input current (IIL) is small.However, as the EN voltage (VIL) approaches the nega-tive supply rail, IIL increases (Figure 2). A single resis-tor connected as shown in Figure 3 prevents the rise inthe logic-low input current. This resistor provides afeedback mechanism that increases VIL as the logicinput is brought to VEE. Figure 4 shows the resultinginput current (IIL).
When the MAX4018 is disabled, the amplifier’s outputimpedance is 35kΩ. This high resistance and the low2pF output capacitance make this part ideal inRF/video multiplexer or switch applications. For largerarrays, pay careful attention to capacitive loading. Seethe Output Capacitive Loading and Stability section formore information.
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Low-Cost, High-Speed, Single-SupplyOp Amps with Rail-to-Rail Outputs
______________________________________________________________________________________ 11
RF (Ω) 24 500
RG (Ω) ∞ 500
COMPONENT
RS (Ω) — 0
RTIN (Ω) 49.9 56
Small-Signal -3dB Bandwidth (MHz) 200 90
RTO (Ω) 49.9 49.9
Table 1. Recommended Component Values
Note: RL = RO + RTO; RTIN and RTO are calculated for 50Ω applications. For 75Ω systems, RTO = 75Ω; calculate RTIN from the following equation:
500
500
—
49.9
105
49.9
500
250
0
62
60
49.9
500
124
—
49.9
25
49.9
500
100
0
100
33
49.9
500
56
—
49.9
11
49.9
500
50
0
∞
25
49.9
500
20
—
49.9
6
49.9
GAIN (V/V)
1200
50
0
∞
10
49.9
+1 -1 +2 -2 +5 -5 +10 -10 +25 -25
R = 75
1-75R
TIN
G
Ω
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To implement the mux function, the outputs of multipleamplifiers can be tied together, and only the amplifierwith the selected input will be enabled. All of the otheramplifiers will be placed in the low-power shutdownmode, with their high output impedance presentingvery little load to the active amplifier output. For gainsof +2 or greater, the feedback network impedance ofall the amplifiers used in a mux application must beconsidered when calculating the total load on theactive amplifier output
Output Capacitive Loading and StabilityThe MAX4012/MAX4016/MAX4018/MAX4020 are opti-mized for AC performance. They are not designed todrive highly reactive loads, which decreases phasemargin and may produce excessive ringing and oscilla-tion. Figure 5 shows a circuit that eliminates this prob-lem. Figure 6 is a graph of the optimal isolation resistor(RS) vs. capacitive load. Figure 7 shows how a capaci-tive load causes excessive peaking of the amplifier’sfrequency response if the capacitor is not isolated fromthe amplifier by a resistor. A small isolation resistor(usually 20Ω to 30Ω) placed before the reactive loadprevents ringing and oscillation. At higher capacitiveloads, AC performance is controlled by the interactionof the load capacitance and the isolation resistor.Figure 8 shows the effect of a 27Ω isolation resistor onclosed-loop response.
Coaxial cable and other transmission lines are easilydriven when properly terminated at both ends with theircharacteristic impedance. Driving back-terminatedtransmission lines essentially eliminates the line’scapacitance.
Low-Cost, High-Speed, Single-SupplyOp Amps with Rail-to-Rail Outputs
12 ______________________________________________________________________________________
OUT
IN-EN_
IN+
10kΩ
ENABLE
MAX40_ _
20
-1600 50 100 150 300 350 500
-100
-120
0
mV ABOVE VEE
INPU
T CU
RREN
T (µ
A)
200 250 400 450
-60
-140
-20
-40
-80
0
-100 50 100 150 300 350 500
-7
-8
-1
mV ABOVE VEE
INPU
T CU
RREN
T (µ
A)
200 250 400 450
-3
-5
-9
-2
-4
-6
Figure 2. Enable Logic-Low Input Current vs. VIL
Figure 4. Enable Logic-Low Input Current vs. VIL with 10kΩSeries Resistor
Figure 3. Circuit to Reduce Enable Logic-Low Input Current
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Low-Cost, High-Speed, Single-SupplyOp Amps with Rail-to-Rail Outputs
______________________________________________________________________________________ 13
RG RF
RISO
50Ω
CL
VOUT
VIN
RTIN
MAX40_ _
Figure 5. Driving a Capacitive Load through an Isolation Resistor
30
25
20
5
10
15
0
CAPACITIVE LOAD (pF)500 100 200150 250
ISOL
ATIO
N RE
SIST
ANCE
, RIS
O (Ω
)
Figure 6. Capacitive Load vs. Isolation Resistance
6
-4100k 10M 100M1M 1G
-2
FREQUENCY (Hz)
GAIN
(dB)
0
2
4
5
-3
-1
1
3
CL = 10pF
CL = 15pF
CL = 5pF
Figure 7. Small-Signal Gain vs. Frequency with LoadCapacitance and No Isolation Resistor
3
-7100k 10M 100M1M 1G
-5
FREQUENCY (Hz)
GAIN
(dB)
-3
-1
1
2
-6
-4
-2
0CL = 68pF
RISO = 27Ω
CL = 120pF
CL = 47pF
Figure 8. Small-Signal Gain vs. Frequency with LoadCapacitance and 27Ω Isolation Resistor
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Low-Cost, High-Speed, Single-SupplyOp Amps with Rail-to-Rail Outputs
14 ______________________________________________________________________________________
TOP VIEW
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUTC
INC-
INC+
VEEVCC
ENB
ENC
ENA
MAX4018
INB+
INB-
OUTBOUTA
INA-
INA+
SO
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUTD
IND-
IND+
VEEVCC
INA+
INA-
OUTA
MAX4020
INC+
INC-
OUTCOUTB
INB-
INB+
SO
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
OUTC
INC-
INC+
VEE
INB+
INB-
OUTB
N.C.
ENA
ENC
ENB
VCC
INA+
INA-
OUTA
N.C.
MAX4018
QSOP
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
OUTD
IND-
IND+
VEE
INC+
INC-
OUTC
N.C.
OUTA
INA-
INA+
VCC
INB+
INB-
OUTB
N.C.
MAX4020
QSOP
INB-
INB+VEE
1
2
8
7
VCC
OUTBINA-
INA+
OUTA
SO/µMAX
3
4
6
5
MAX4016
Pin Configurations (continued)
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Low-Cost, High-Speed, Single-SupplyOp Amps with Rail-to-Rail Outputs
______________________________________________________________________________________ 15
___________________Chip InformationOrdering Information (continued)
PARTTEMP
RANGETOP
MARKPIN-PACKAGE
14 SO
16 QSOP
14 SO
16 QSOP
MAX4018ESD -40°C to +85°C
MAX4018EEE -40°C to +85°C
MAX4020ESD -40°C to +85°C
MAX4020EEE -40°C to +85°C
—
—
—
—
MAX4012 TRANSISTOR COUNT: 95MAX4016 TRANSISTOR COUNT: 190MAX4018 TRANSISTOR COUNT: 299MAX4020 TRANSISTOR COUNT: 362
SO
T-23
5L
.EP
S
E1
121-0057
PACKAGE OUTLINE, SOT-23, 5L
Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informationgo to www.maxim-ic.com/packages.)
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Low-Cost, High-Speed, Single-SupplyOp Amps with Rail-to-Rail Outputs
16 ______________________________________________________________________________________
8LU
MA
XD
.EP
S
PACKAGE OUTLINE, 8L uMAX/uSOP
11
21-0036 JREV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
MAX0.043
0.006
0.014
0.120
0.120
0.198
0.026
0.007
0.037
0.0207 BSC
0.0256 BSC
A2 A1
ce
b
A
L
FRONT VIEW SIDE VIEW
E H
0.6±0.1
0.6±0.1
ÿ 0.50±0.1
1
TOP VIEW
D
8
A2 0.030
BOTTOM VIEW
16∞
S
b
L
HE
De
c
0∞
0.010
0.116
0.116
0.188
0.016
0.005
84X S
INCHES
-
A1
A
MIN
0.002
0.950.75
0.5250 BSC
0.25 0.36
2.95 3.05
2.95 3.05
4.78
0.41
0.65 BSC
5.03
0.66
6∞0∞
0.13 0.18
MAXMIN
MILLIMETERS
- 1.10
0.05 0.15
α
α
DIM
QS
OP
.EP
S
E1
121-0055
PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH
Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informationgo to www.maxim-ic.com/packages.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
17 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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Low-Cost, High-Speed, Single-SupplyOp Amps with Rail-to-Rail Outputs
SO
ICN
.EP
S
PACKAGE OUTLINE, .150" SOIC
11
21-0041 BREV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
MAX
0.010
0.069
0.019
0.157
0.010
INCHES
0.150
0.007
E
C
DIM
0.014
0.004
B
A1
MIN
0.053A
0.19
3.80 4.00
0.25
MILLIMETERS
0.10
0.35
1.35
MIN
0.49
0.25
MAX
1.75
0.0500.016L 0.40 1.27
0.3940.386D
D
MINDIM
D
INCHES
MAX
9.80 10.00
MILLIMETERS
MIN MAX
16 AC
0.337 0.344 AB8.758.55 14
0.189 0.197 AA5.004.80 8
N MS012
N
SIDE VIEW
H 0.2440.228 5.80 6.20
e 0.050 BSC 1.27 BSC
C
HE
e B A1
A
D
0∞-8∞L
1
VARIATIONS:
Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informationgo to www.maxim-ic.com/packages.)