Specifications
Ordering Information
J1
J2
J3
J4
J5
J7
J9
J11
J13
J12
J14
J6
J8
Pin 3
Pin 2
Pin 1
Pin 1
Pin 2
Pin 3
AES 1 A/B In
Analog Audio
Out 1
Analog Audio
Out 2
Analog Audio
Out 4
Analog Audio
Out 3
AES 1 A/B In
AES Out 1
AES Out 3
AES Out 4
AES Out 2
AES 2 C/D In
AES 2 C/D In
Not Used
Not Used
8900A-R
+
_
G
G
_
+
Ethernet Control via frame bus
Microprocessor
LEDs
AES 1
AES 2
AES 3
AES 4
Local
Control
AES
Input 2
AES
Input 1
Unbalanced
Unbalanced
Balanced
Balanced
Balanced
Analog Audio 1&2
Balanced
Analog Audio 3&4
Sum
Swap
Invert
Etc.
Audio
Processing
D-to-A
Convertion
Sample
Rate
Converter
4x4
Router
Delay
and
Gain
D-to-A
Convertion
AES
Distributors
17
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
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.
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
•
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
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
8921DAC
Four-Channel Audio D-to-A Converter w/Delay
For detailed specifications, installation, and setup
instructions see:
www.grassvalley.com/docs/modular
