User Manual Sirius 600 Audio Converters - Grass Valley 600… · 3.2 4791 Input Card The 4791 Input...

User Manual

Sirius 600 Audio Converters4790 and 4791 Input Cards4795 and 4796 Output Cards

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Sirius Audio Converters www.snellgroup.com

Issue 3 Rev 2 © 2014 Snell Limited

Sirius Audio Converters www.snellgroup.com Contents

Contents

1. About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.1 Contact Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.2 Copyright and Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3. Hybrid Audio Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93.1 4790 Input Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1.1 Adjusting the Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93.2 4791 Input Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.2.1 Adjusting the Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113.3 4795 Output Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.3.1 Test Tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.3.2 Adjusting the Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.4 4796 Output Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.4.1 Test Tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.4.2 Adjusting the Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.5 Audio Modify Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4. Rear Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194.1 4U Frame - Analogue Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194.2 7U Frame - Analogue Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.3 16U Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.4 50-way D-type Connector Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235.1 4790 and 4791 Input Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235.2 4795 and 4796 Output Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24


Sirius Audio Converters www.snellgroup.com Contents


Sirius Audio Converters www.snellgroup.com About this Manual

1. About this Manual

This manual describes the Sirius Audio Converters fitted in the Sirius 600 router range.

If you have any questions regarding the installation and setup of your product, please refer to the Customer Service contact details (see section 1.1).

1.1 Contact Details

For details of our Regional Customer Support Offices please visit the Snell web site.

http://www.snellgroup.com/support/customer-support/

Customers with a support contract should call their personalized number, which can be found in their contract, and be ready to provide their contract number and details.

1.2 Copyright and Disclaimer

Copyright protection claimed includes all forms and matters of copyrightable material and information now allowed by statutory or judicial law or hereinafter granted, including without limitation, material generated from the software programs which are displayed on the screen such as icons, screen display looks etc.

Information in this manual and software are subject to change without notice and does not represent a commitment on the part of Snell Limited. The software described in this manual is furnished under a license agreement and can not be reproduced or copied in any manner without prior agreement with Snell Limited. or their authorized agents.

Reproduction or disassembly of embedded computer programs or algorithms prohibited.

No part of this publication can be transmitted or reproduced in any form or by any means, electronic or mechanical, including photocopy, recording or any information storage and retrieval system, without permission being granted, in writing, by the publishers or their authorized agents.

Snell operates a policy of continuous improvement and development. Snell reserves the right to make changes and improvements to any of the products described in this document without prior notice.


http://www.snellgroup.com/support/customer-support/

Sirius Audio Converters www.snellgroup.com About this Manual


Sirius Audio Converters www.snellgroup.com Introduction

2. Introduction

The Sirius 600 audio input and output cards provide the necessary conversion to enable stereo analogue sources or destinations to be routed through any Sirius 600 digital crosspoint card, and to be used in combination with the Sirius 600 AES digital audio cards.

• 4790: Eight channel stereo analogue audio input ADC

• 4791: Eight channel stereo analogue audio input ADC

• 4795: Eight channel stereo analogue audio output DAC

• 4796: Eight channel stereo analogue audio output DAC

These cards can therefore be directly substituted for the AES input, or AES output cards, for users requiring an analogue or mixed Sirius 600 audio router. The hybrid cards can also perform the same audio modify functions as the digital cards, allowing use in a mixed mono/stereo environment. These features are documented in Section 3.5.

The cards have input and output gain adjustment with a range of +15 to +24 dBU at 0DBFS, these are user adjustable for each channel and stored in non-volatile RAM. The output card can also generate test tones to assist with the lining-up process. These features are documented in chapter 3.

These cards operate in synchronous or asynchronous AES environment. If a valid AES11 reference is supplied to the Sirius 600 frame, this provides clean click-free switching, and enables all the audio modify features. In an asynchronous Sirius 600 frame with no reference, the input card free-runs at 48 kHz, and the output card converts from any sample rate in the range 32 to 54 kHz, although no audio modify features function.

The DAC Auto detect determines which reference is selected:

• ADC Reference = I2S

• No Reference = AES Free-runs at 48 kHz,

Both cards have on-board circuitry for input and output monitoring via the Sirius 600 monitoring card.

There are also two builds of connector panel to accompany the input and output cards:

• 1767: fitted with 50-way D-type plug for 8 stereo inputs

• 1768: fitted with 50-way D-type socket for 8 stereo outputs

4790 and 4795 cards can only be used with the following 'series 1' crosspoint cards:

• 3906: 128x32 HD/SDV/Audio Crosspoint (4U/7U frame)

• 3907: 128/32 SDV/Audio Crosspoint (4U/7U frame)

• 3909: 256x64 SDV/Audio Crosspoint (16U frame)

• 4907: 128x32 Audio Crosspoint (4U/7U frame)

• 4909: 256x64 Audio Crosspoint Audio/AES/Data/Timecode (16U frame)


Sirius Audio Converters www.snellgroup.com Introduction

4791 and 4796 cards can be used with any of the 'series 1' crosspoint cards listed above, and the following 'series 2' crosspoint cards:

• 3908: 256x32 HD/SD/Audio Crosspoint module (16U frame)

• 3912: 128x32 HD/SD/Audio Crosspoint module (4U and 7U frame)

• 3913: 256x64 HD/SD/Audio Crosspoint module for Sirius Gold

• 3962: 128x32 3G/HD/SD/Audio Crosspoint module (4U and 7U frame)

• 3969: 256x64 3G/HD/SD/Audio Crosspoint module (16U frame)

• 4905: 256x32 Audio Crosspoint module 16U frame)

• 4911: 128x32/128x64 Audio Crosspoint module (4U and 7U frame)

• 4913: 256x64 Audio Crosspoint module for Sirius Gold


Sirius Audio Converters www.snellgroup.com Hybrid Audio Cards

3. Hybrid Audio Cards

3.1 4790 Input Card

The 4790 Input Card has eight inputs of stereo analogue audio, with separate balanced left and right channels and non-volatile gain adjustment. These are converted to digital signals of an internal format designed to feed Sirius 600 AES or Audio Hybrid output cards via any Sirius 600 digital crosspoint. If the frame is supplied with a valid AES11reference, which can be in the range 32 to 54 kHz, all digital outputs from the card are aligned to the reference. With no reference detected the card runs at approximately 48 kHz, as set by an on-board oscillator. The outputs have 24bit resolution with channel status indicating Professional, Locked (with frame reference) or Unlocked, Flat (no emphasis), Stereo, with no aux bits. The sample rate status is flagged as '48 kHz' if the on-board crystal locks to the frame reference, otherwise it is set to 'not indicated'.

The front edge of the card has push buttons for adjusting and storing the gain setting, a HEX switch for selecting the channel, and a piano type DIL switch for mode selection. A green LED indicates that power is present, a red LED to indicate that no reference has been detected, and a tri-color LED to show gain status. Section 3.1.1 describes the Gain adjustments.

3.1.1 Adjusting the Gain

Fig 2. shows the front edge switches. Only position 4 of the piano type DIL switch is used. When set Down (ON), the UP and DOWN buttons increment and decrement the gain of the mono analogue channel, see Table 1.

Note: This card only works with series one crosspoint cards.

Fig 1. 4790 Input Card

Fig 2. Adjusting the Gain

Switch Position Channel Switch Position Channel

0 1 LEFT 8 5 LEFT

1 1 RIGHT 9 5 RIGHT

2 2 LEFT A 6 LEFT

3 2 RIGHT B 6 RIGHT

4 3 LEFT C 7 LEFT

5 3 RIGHT D 7 RIGHT

Table 1. Adjusting The Gain

Store LED D9 Down Channel Up Switch 54 Up - Inhibit

4 Down - Adjust



At large signal levels the gain increment is 0.25dB, and at lower levels it is 0.025dB. The UP and Down buttons are auto-repeating at a rate of 2 steps per second if kept pressed. When the required gain level has been achieved, it is committed to non-volatile memory by pressing the STORE button, if this is not pressed the channel reverts to the last saved gain setting when the module is re-powered. A tri-color LED indicates the status of the gain adjustment for the current channel:

The switch position for normal operation is Switch 5, position 4 UP (INHIBIT).

6 4 LEFT E 8 LEFT

7 4 RIGHT F 8 RIGHT

D9 Color Status

BLUE Gain being decreased

GREEN Gain being increased

RED Gain setting being stored

OFF Normal statusTable 2. D9 LED Color





3.2 4791 Input Card

The 4791 Input Card has eight inputs of stereo analogue audio, with separate balanced left and right channels and non-volatile gain adjustment. These are converted to digital signals of an internal format designed to feed Sirius 600 AES or Audio Hybrid output cards via any Sirius 600 digital crosspoint. If the frame is supplied with a valid AES11reference, which can be in the range 32 to 54 kHz, all digital outputs from the card are aligned to the reference. With no reference detected the card runs at approximately 48 kHz, as set by an on-board oscillator. The outputs have 24bit resolution with channel status indicating Professional, Locked (with frame reference) or Unlocked, Flat (no emphasis), Stereo, with no aux bits. The sample rate status is flagged as '48 kHz' if the on-board crystal locks to the frame reference, otherwise it is set to 'not indicated'.

The front edge of the card has push buttons for adjusting and storing the gain setting, a HEX switch for selecting the channel, and a piano type DIL switch for mode selection. A green LED indicates that power is present, a red LED to indicate that no reference has been detected, and a tri-color LED to show gain status. Section 3.2.1 describes the Gain adjustments.


Fig 2. shows the front edge switches, for details of the Switch 5 setting options see Table 3.




4 Down - Adjust



SW5 Position

Description

SW5-1

Select either a free running count in the channel status sample address field or Legacy mode for older or non compliant AES equipment.

SW5-1 UP

Selects a dynamic free-running count in the Channel Status Sample-Address field. Each block of Channel Status will have a different value in this field and calculates a new CRCC-value. This tests downstream equipment for correct CRCC-detection and could be used to track missing samples.

SW5-1 DOWN

Selects “Legacy-mode”. This sets the Sample-Address field at all zeros. This results in static Channel Status, as may be required to satisfy older or non-compliant AES equipment.

SW5-2

On power-up each ADC must run its Calibration routine at least once. This measures DC-offsets on the input pins and then subtracts this value from all future conversions. This results in a better, lower noise-floor figure.

If the AES Reference is removed & re-connected, the disruption this causes to the internal clocks usually invalidates the calibration.

For best noise-floor when the Reference is lost, or never present, use “Once-only calibration” (SW5-2 UP).

For best noise-floor after the Reference is reconnected, use “Re-calibrate after Ref-lock” (SW5-2 DOWN).

SW5-2 UP

Selects “Once-only Calibration”, this occurs only on power-up.

This is the normal situation for a system where the AES reference is not expected to change.

SW5-2 DOWN

Selects “Re-calibrate after Reference-lock”. Every time the card detects the change from No-reference (red NOREF Led On) to a good Reference (NOREF Led off), the calibration routine is run after a delay set by SW5-3.

This may cause a short period of muted samples during measurement, but gives a better noise-figure once completed. Ideally any analogue signals connected to the ADC inputs should be muted or unpowered during re-calibration for best results.

SW5-3

Select the delay before the calibration routine is run.

SW5-3 UP Selects a 4-second delay before running the calibration routine.

SW5-3 DOWN

Selects a 10-second delay before running the calibration routine.

This setting applies to both power-up calibration and Re-calibrate after Ref-lock (if used).

SW5-4

Enable or disable gain adjustment buttons.

SW5-4 UP Disables the UP and DOWN buttons for gain adjustment.

SW5-4 Down

The UP and DOWN buttons increment and decrement the gain of the mono analogue channel, see Table 4.

Table 3. SW5 DIL Switch Settings






0 1 LEFT 8 5 LEFT

1 1 RIGHT 9 5 RIGHT

2 2 LEFT A 6 LEFT

3 2 RIGHT B 6 RIGHT

4 3 LEFT C 7 LEFT

5 3 RIGHT D 7 RIGHT

6 4 LEFT E 8 LEFT

7 4 RIGHT F 8 RIGHT


D9 Color Status







3.3 4795 Output Card

The 4795 Input Card has eight outputs of stereo analogue audio, with separate left and right channels and non-volatile gain adjustment. These are converted from digital signals of an internal format produced from either an AES or Audio Hybrid input card via any Sirius 600 digital crosspoint. If the frame is supplied with a valid AES11reference, which can be in the range 32 to 54 kHz, the card looks for synchronous digital signals, which allows all audio modify functions to be available. With no reference detected the card converts signals of any sample rate in the range 32 to 54 kHz. Each channel uses a 24 bit Delta-Sigma converter and is fed through a low-pass Butterworth filter. An auto-mute is applied to invalid1 signals.

The front edge of the card has push buttons for adjusting and storing the gain setting, a HEX switch for selecting the channel, and a piano type DIL switch for gain mode and test tone selection. A green LED indicates that power is present, a red LED to indicate that no reference has been detected, and a tri-color LED to show gain status. Gain adjustments and test tone selection are detailed in the next Sections.

3.3.1 Test Tones

The 4-way piano type DIL switch on the card front edge is used to switch test tones to the channel outputs to aid level adjustment, as follows:

The term 'Occulting' refers to a pulsed tone, on for 0.75 second and off for 0.25 second. The switch position for normal operation is all switches UP.

Note: This card only works with series one crosspoint cards.


1. The Validity bit is set to Do not convert to analogue

Fig 6. Test Tones

Mode Sw1 Sw2 Sw3 Outputs

0 DOWN DOWN DOWN 1 kHz Left and Right at -18dBFS

1 UP DOWN DOWN 1 kHz Right, Left Occulting, -18dBFS

2 DOWN UP DOWN 1 kHz Left and Right, 0dBFS

3 UP UP DOWN 1 kHz Right, Left Occulting, 0dBFS

4 DOWN DOWN UP 440Hz Left and Right, 0dBFS

5 UP DOWN UP 440Hz Right, Left Occulting. 0dBFS

6 DOWN UP UP Silence Left and Right

7 UP UP UP Both Outputs from crosspointTable 6. 4-way piano type DIL switch

Switch 5Positions 1, 2 and 3 select test tones




Fig 7. shows the front edge switches. Position 4 of the piano type DIL switch is used to select the adjustment mode. When set Down (ON), the UP and DOWN buttons increments and decrements the gain of the mono analogue channel, see Table 7.





0 1 LEFT 8 5 LEFT

1 1 RIGHT 9 5 RIGHT

2 2 LEFT A 6 LEFT

3 2 RIGHT B 6 RIGHT

4 3 LEFT C 7 LEFT

5 3 RIGHT D 7 RIGHT

6 4 LEFT E 8 LEFT

7 4 RIGHT F 8 RIGHTTable 7. Switch Position

D9 Color Status






4 Down - Adjust



3.4 4796 Output Card

The 4796 Input Card has eight outputs of stereo analogue audio, with separate left and right channels and non-volatile gain adjustment. These are converted from digital signals of an internal format produced from either an AES or Audio Hybrid input card via any Sirius 600 digital crosspoint (the card auto-detects whether the signal is synchronous or asynchronous and converts either). If the frame is supplied with a valid AES11reference, which can be in the range 32 to 54 kHz, the card looks for synchronous digital signals, which allows all audio modify functions to be available. With no reference detected the card converts the signals of any sample rate in the range 32 to 54 kHz. Each channel uses a 24 bit Delta-Sigma converter and is fed through a low-pass Butterworth filter. An auto-mute is applied to invalid2 signals.

The front edge of the card has push buttons for adjusting and storing the gain setting, a HEX switch for selecting the channel, and a piano type DIL switch for gain mode and test tone selection. A green LED indicates that power is present, a red LED to indicate that no reference has been detected, and a tri-color LED to show gain status. Gain adjustments and test tone selection are detailed in the next Sections.

3.4.1 Test Tones

The 4-way piano type DIL switch on the card front edge is used to switch test tones to the channel outputs to aid level adjustment, as follows:

The term 'Occulting' refers to a pulsed tone, on for 0.75 second and off for 0.25 second. The switch position for normal operation is all switches UP.


2. The Validity bit is set to Do not convert to analogue

Fig 9. Test Tones

Mode Sw1 Sw2 Sw3 Outputs

0 DOWN DOWN DOWN 1 kHz Left and Right at -18dBFS

1 UP DOWN DOWN 1 kHz Right, Left Occulting, -18dBFS

2 DOWN UP DOWN 1 kHz Left and Right, 0dBFS

3 UP UP DOWN 1 kHz Right, Left Occulting, 0dBFS

4 DOWN DOWN UP 440Hz Left and Right, 0dBFS

5 UP DOWN UP 440Hz Right, Left Occulting. 0dBFS

6 DOWN UP UP Silence Left and Right

7 UP UP UP Both Outputs from crosspointTable 9. 4-way piano type DIL switch

Switch 5Positions 1, 2 and 3 select test tones




Fig 7. shows the front edge switches. Position 4 of the piano type DIL switch is used to select the adjustment mode. When set Down (ON), the UP and DOWN buttons increment and decrement the gain of the mono analogue channel, see Table 10.

At large signal levels the gain increment is 0.25dB, and at lower levels it is 0.025dB. The UP and Down buttons are auto-repeating at a rate of 2 steps per second if kept pressed. When the required gain level has been achieved, it is committed to non-volatile memory by pressing the STORE button, if this is not pressed, the channel reverts to the last saved gain setting when the module is re-powered. A tri-color LED indicates the status of the gain adjustment for the current channel:


3.5 Audio Modify Features

When operating in synchronous mode, the 4791 and 4796 cards allow the user to apply audio modify functions to individual channels. These functions enable the router to be used in a mixed mono/stereo environment such that non stereo inputs may be routed to stereo outputs, and vice versa.

The different input and output modes are configured in the Sirius 600 configurable database, see Section 7 of the main Sirius 600 user guide, no audio modification is available with the fixed database. Each input and output may either have its mode fixed in the database, or be switched dynamically from a 6276 or 6277 control panel. See Section 7.9.4.14 and 7.9.4.15 of the Sirius 600 user guide for full configuration and operational details. The modes for inputs and outputs are as follows:



0 1 LEFT 8 5 LEFT

1 1 RIGHT 9 5 RIGHT

2 2 LEFT A 6 LEFT

3 2 RIGHT B 6 RIGHT

4 3 LEFT C 7 LEFT

5 3 RIGHT D 7 RIGHT

6 4 LEFT E 8 LEFT

7 4 RIGHT F 8 RIGHTTable 10. Switch Position

D9 Color Status






4 Down - Adjust



Any type of input can be routed to any type of output, and the digital output is modified appropriately. Although it may appear that audio is being modified independently by the input and output cards, all processing is actually performed by the output card in the digital domain, according to data received from the Sirius 600 control card.

Mode of Analogue Input Mode of Analogue Output

Normal stereo Normal stereo

Left channel to both Mono (left+right)/2

Right channel to both Left and right swapped

Left and right swappedTable 12.


Sirius Audio Converters www.snellgroup.com Rear Panel Connections

4. Rear Panel Connections

4.1 4U Frame - Analogue Audio

Fig 11. shows the physical layout, and does not take account of any level mapping configured on the control or interface module, in which case appropriate offsets must be applied, see the Sirius 600 User Manual.

Fig 11. 4U Frame

RS 485

1 2

U B

625 525

ALARMS

CTRL A CTRL B

ADDR

LTC

EXP

3

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

41-48

49-56 Inputs

Outputs

25-32

33-40

9-16

17-24 1-8

41-48

49-56

25-32

33-40

9-16

17-241-8



4.2 7U Frame - Analogue Audio

Fig 12. 7U Frame

RS 485

1 2

U B

625 525

ALARMS

CTRL A CTRL B

ADDR

LTC

EXP

3

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

IN

PU

T

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

OU

TP

UT

49-56

57-64Inputs

Outputs

33-40

41-48

17-24

25-32 9-16

41-48

49-56

25-32

33-40

9-16

17-241-8

57-64 1-8

73-8

0

65-7

2

89-9

6

81-8

8

105

-11

2

97-

104

113-

120

12

1-12

8

Outputs

12

1-12

8

113-

120

105

-11

2

97-

104

89-9

6

81-8

8

73-8

0

65-7

2Inputs



4.3 16U Frame

Fig 13. 16U Frame



4.4 50-way D-type Connector Pinout

Table 13. lists the pin allocations for the 50-way D-type plug and socket used for balanced AES connections.

Fig 14. 50-way D-type Connector Pinout

Channel Function Pin Channel Function Pin

1 Left

Signal + 18

5 Left

Signal + 26

Signal 2 Signal 10

Signal GND 34 Signal GND 42

1 Right

Signal + 35

5 Right

Signal + 43

Signal 19 Signal 27


2 Left

Signal + 20

6 Left

Signal + 28

Signal 4 Signal 12


2 Right

Signal + 37

6 Right

Signal + 45

Signal 21 Signal 29


3 Left

Signal + 22

7 Left

Signal + 30

Signal 6 Signal 14


3 Right

Signal + 39

7 Right

Signal + 47

Signal 23 Signal 31


4 Left

Signal + 24

8 Left

Signal + 32

Signal 8 Signal 16


4 Right

Signal + 41

8 Right

Signal + 49

Signal 25 Signal 33


Screen Chassis GND 1 Screen Chassis GND 50 Table 13. 50-way D-type Connector Pinout

1

18

34

17

33

50

17

33

50

1

18

Output connector 50-way D-type socket

Input connector 50-way D-type plug


Sirius Audio Converters www.snellgroup.com Specifications

5. Specifications

5.1 4790 and 4791 Input Cards

Inputs

Number and type: 8 analogue stereo, balanced, differential, on each 4791 card

Level adjustment: Between +15 and +24 dBu for 0 dBFS, with 0.025 dB to 0.25 dB gain resolution (15 - 24 dBU)

Input Impedance: 10 kOhm

Frequency Response: +/-0.1 dB 40 Hz - 15 kHz

+/-0.3 dB 20 Hz - 20 kHz at +18 dBU

(within the limits of the gain resolution)

THD: 0.02% at +18 dBU band limited 20 Hz to 20 kHz

0.025% unlimited

Noise: -77dB CCIR 468-2 q-pk, at +18dBU

-88dB DIN RMS 22Hz - 22 kHz

Channel Phase Variation 20 Hz - 200 Hz <10º

200 Hz - 4 kHz <5º

4 kHz - 15 kHz <10º

CMRR: <60 dB at 0 dBU, -48 dB at +18 dBU

Left/Right crosstalk: 96 dB at 16 kHz, 102 dB at 1 kHz

Outputs

Number and type: 8 stereo channels at 32 Hz - 54 kHz, 24 bit internal format when referenced, full AES3 when free running

Power Consumption: Approximately 95 mA at 48 V (4.56 W)


Sirius Audio Converters www.snellgroup.com Specifications

5.2 4795 and 4796 Output Cards

All measurements are into high impedance only.

Outputs

Number and type: 8 electronically balanced stereo analogue on each 4796

Level adjustment: Between +15 and +24 dBu for 0 dBFS, with 0.025 dB to 0.25 dB gain resolution (15 - 24 dBU)

Input Impedance: 40 Ohm

Frequency Response: +/-0.1 dB 40 Hz - 15 kHz

+/-0.3 dB 20 Hz - 20 kHz at +18 dBU

(within the limits of the gain resolution)

THD: <0.1% band limited 22 Hz to 22 kHz

Noise: -77 dB CCIR 468-2 q-pk, at +18 dBU

-88 dB DIN RMS 22 Hz - 22 kHz

Channel Phase Variation 20 Hz - 200 Hz <10º

200 Hz - 4 kHz <5º

4 kHz - 15 kHz <10º

Left/Right crosstalk: 96 dB at 16 kHz, 110 dB at 1 kHz

Inputs

Number and type: 8 stereo channels at 32 Hz - 54 kHz, 24bit internal format when referenced, full AES3 when free running

Power Consumption: Approximately 266 mA at 48 V (12.7 W)


User Manual Sirius 600 Audio Converters - Grass Valley 600… · 3.2 4791 Input Card The 4791 Input...

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