J1
J2
J3
J4
J5
J7
J9
J11
J13
J12
J14
J6
J8
AES 1-1
AES 1-2
AES 1-3
Pin 3
Pin 3
Pin 2 Pin 2
Pin 1
Pin 1
Audio In 1 Audio In 2
Audio In 4Audio In 3
Loopthru
Looping
Reference Input
Tracking Input
(J5 to pins 2-3)
or AES 1 Out
(J5 to pins 1-2)
Tracking Output
(J6 to pins 2-3)
or AES 2 Out
(J6 to pins 1-2)
AES 2-1
AES 2-2
AES 2-3
G
_
+
8900A-R
+
_
G
Sum
Swap
Invert
Etc.
A-to-D
Conversion
Gain,
Delay
and Pairing
Audio
Processing
Reference
Input
Unbalanced AES 1/
Tracking Input
Unbalanced AES 2/
Tracking Input
Balanced
AES 2
Balanced
AES 1
LEDs
Ethernet
Audio
Input 1
Audio
Input 2
Audio
Input 3
Audio
Input 4
Specifications Ordering Information
16
This module can be mounted in a GeckoFlex
frame when ordered with the 8900A-R GeckoFlex
Audio Rear module.
8921ADT
Four-channel audio analog-to-digital converter with
delay tracking
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
Key Features
User-selectable 48 kHz or 96 kHz sampling•
rates
24-bit ADC A-to-D conversion•
>105 dB “A” weighted signal-to-noise•
ratio
Independent control of each audio•
channel including channel pairing, level
adjustment, swapping, summation, phase
inversion, delay up to 1.5 seconds, test
tone generation
Auto tracking delay of video frame•
synchronizers (8900FSS, 8981FS)
Four inputs, two pairs of balanced High Z•
analog audio inputs:
—Supports levels up to +30 dBu
Looping reference input supports NTSC/•
PAL color black, AES signal, 48 kHz or
96 kHz DARS
Options:•
— 8900-A-CBL package of four cables,
breakout cable package converts three-
pin balanced AES audio to dual 75Ω
BNCs, unbalanced AES audio
—8900-GFA-CBL package of four
cables, breakout cable package for
GeckoFlex 8900A-R rear module with
three-terminal to dual BNCs converts
balanced AES audio to dual 75Ω,
unbalanced AES audio
The 8921ADT provides conversion of four
channels of analog audio to two digital audio
streams. In addition to conversion, it offers two
forms of delay. These delays are summed—a
fixed delay of up to 1.5 seconds and a variable
delay based on a signal from video decoders
fitted with frame synchronizers or directly from
a frame sync card, enabling adjustment for
large, fixed lip sync errors while continually
adjusting audio delay to match video delay
created by the frame synchronizer. Operational
modes allow modification to the outgoing
signal, such as levels, channel swapping,
channel summing, and phase inversion plus
channel pairing for the digital audio streams.
Many adjustments to this card can be
performed directly on the module card-edge
controls, while a few of the more complex
adjustments require the Web-based interface
or the Newton control panel.
Supported Frame Types
GeckoFlex with 8900A-R GeckoFlex Audio rear
module, Gecko audio frames: 8900TX-A, 8900TF-A,
8900TFN-A
Power Rating
4.7 Watts – single slot
Analog Inputs
Number of inputs: Four balanced
Impedance: >22 kΩ
Common mode input voltage: 20V maximum
Connector: Three-pin mini-terminal strip
Reference Input
Number of inputs: One differential loop-through
Impedance: High Z loop-through
Input return loss: >40 dB 100 kHz to 10 MHz
@ 75Ω
Common mode input voltage: ±1V maximum
Digital Outputs
Number of outputs: Three balanced and one
unbalanced per channel
Signal type:
•Balanced:AES-3id-1992
•Unbalanced:AES-3id-2001
Output voltage level:
•Balanced:3Vp-p±0.2V@110Ω
•Unbalanced:1Vp-p±0.2V@75Ω
Output impedance:
•Balanced:110Ω
•Unbalanced:75Ω
Connector type: Three-pin mini-terminal strip
Sample rate: 48 kHz or 96 kHz jumper selectable
8921ADT Four-Channel Audio A-to-D Converter w/Delay Tracking
For detailed specifications, installation, and setup
instructions see:
www.grassvalley.com/docs/modular
