Grass valley 8921DAC DATASHEET
8921DAC Four-Channel Audio D-to-A Converter w/Delay 17
Key Features
•Two 32-96 kHz AES/EBU digital audio inputs, either balanced or unbalanced
•24-bit D-to-A conversion
•Four balanced analog audio outputs 0 dBFS supports up to +24 dBu
•Four buffered digital balanced outputs
•Independent control of each audio:
—Channel including
—Channel pairing
—Level adjustments
—Phase inversion
—Delay of up to 5 seconds
—Tone generation
•Card-edge control and status indicators
The 8921DAC provides conversion of two digital audio streams, either balanced or unbalanced, to four analog audio outputs. In addition to digital to analog conversion, it
offers per-channel independent delay with up to 5 seconds per channel. Its various modes enable modification of the outgoing analog signal, such as channel gain, swapping, channel summing, phase inversion, and more. Many adjustments to this card can be performed directly on the module’s card-edge controls while a few of the more complex adjustments require the Web-based interface or the Newton control panel.
Pin 3 |
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G |
Pin 1 |
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Pin 2 |
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8900A-R |
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Pin 2 |
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Pin 1 |
G |
J1 |
+ |
Pin 3 |
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Analog Audio |
J3 |
Analog Audio |
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Out 1 |
Out 2 |
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J2 |
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Analog Audio |
J5 |
Analog Audio |
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Out 3 |
Out 4 |
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J4 |
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AES Out 1 |
J6 |
AES Out 3 |
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AES Out 2 |
J7 |
AES Out 4 |
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J8 |
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AES 1 A/B In |
J9 |
AES 2 C/D In |
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J11
AES 1 A/B In 
AES 2 C/D In
J12
J13
Not Used 
Not Used
J14
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AES |
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Distributors |
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AES |
Unbalanced |
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Input 1 |
Balanced |
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D-to-A |
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Audio |
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Convertion |
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Sample |
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Delay |
Processing |
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4x4 |
Sum |
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Rate |
and |
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Router |
Swap |
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Unbalanced |
Converter |
Gain |
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Invert |
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AES |
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Etc. |
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Input 2 |
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Balanced |
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D-to-A |
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Convertion |
AES 1
AES 2
AES 3
AES 4
Balanced
Analog Audio 1&2
Balanced
Analog Audio 3&4
Local |
Microprocessor |
LEDs |
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Control |
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Specifications
Supported Frame Types
GeckoFlex with 8900A-R GeckoFlex Audio rear module, Gecko audio frames: 8900TX-A, 8900TF-A, 8900TFN-A
Power Rating
8 Watts – single slot
Digital Input
Digital audio input signal:
•Balanced:AES-3id-1992
•Unbalanced:AES-3id-1995
Number of inputs: Two balanced or unbalanced
Connector type:
•Balanced: mini-screw terminal block
•Unbalanced: BNC
Common mode range:
•Balanced: 20 Vp-p DC – 20 kHz
•Unbalanced: N/A
Sampling rate: Input sampling rate 32 to 96 kHz and output sampling rate 48 kHz
Input return loss: >25 dB (100 kHz to 10 MHz)
Input impedance:
•Balanced: 110Ω
•Unbalanced: 75Ω
Ethernet Control via frame bus
Analog Output
Number of outputs: Four channels, single output each channel
Output impedance: 5Ω single-ended and 10Ω differential
Connector type: Mini-screw terminal block
Performance
Signal/noise ratio: >104 dB unweighted 22 kHz filter, >107 dB “A” weighted
THD + noise swept, 20 Hz to 20 kHz: >0.01% 22 kHz filter, +24 dBu (≥–80 dB)
Interchannel crosstalk: <–100 dB 20 Hz to 20 kHz
Frequency response: ±0.1 dB 20 Hz to 20 kHz wrt 1 kHz @ 48 kHz
Other
Operating temperature range: 0° to 45°C Non-operating temperature range: –10° to +70°C
Humidity: 10% to 90% non-condensing
Ordering Information
This module can be mounted in a GeckoFlex frame when ordered with the 8900A-R GeckoFlex Audio Rear module.
8921DAC
Four-channel audio digital-to-analog converter with delay
8900-A-CBL (Gecko Frames only)
Package of four three-terminal to dual BNC cables, used for unbalanced outputs on modules in a Gecko frame
8900-GFA-CBL (GeckoFlex Frames only)
Package of four three-terminal to dual BNC cables, used for unbalanced outputs on 8900A-R modules in a GeckoFlex frame
For detailed specifications, installation, and setup instructions see: www.grassvalley.com/docs/modular
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