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12
8920ADT Audio A-to-D Converter with Autotracking Delay
Key Features
•
24-bit resolution
•
75Ω or 110Ω output
•
Wide range of output modes (swap, invert,
sum, tones)
•
Loop-through reference input (video,
AES-3id, AES word clock)
•
48 kHz sampling rate
•
Terminal block input via adapter
8900CTB-04
•
Up to 1.365 second delay in 2 ms
increments
•
Auto-tracks frame sync delays
(8900FSS, 8981FS, RS-232 serial data)
•
Remote control via Ethernet frame
interface
Specifications
Supported Frame Types
GeckoFlex with 8900V-R GeckoFlex Video rear module,
Gecko video frames: 8900TX-V, 8900TF-V, 8900TFN-V
Power Rating
6 Watts – single slot
Analog Input Signal
Number of inputs: Stereo pair
Connector type: Terminal block 8900CTB-04
Input impedance: >22 kΩ
Input level: +0 to +30 dBu
Sampling rate: 48 kHz
AES Reference Input
Signal type: Composite video, AES-3id-1992,
word clock (48 kHz sample rate)
Number of inputs: One loop-through
Input return loss: >90 dB at 50/60 Hz,
>45 dB to 20 kHz
Output
Signal type: AES-3id-1992 (75Ω), AES3 (110Ω)
Number of channels: Dual 75Ω outputs, single 110Ω
output
Connectors: BNC (75Ω) terminal block adapter
(110Ω)
The 8920ADT takes the best features of
our 8920ADC and 8916, and incorporates
them into one cost-effective, space-
saving module. It provides conversion
of analog audio to digital audio with the
capability to simultaneously adjust for lip
sync errors. It offers two forms of delay
that are summed—a fixed delay of up to
1.365 seconds and a variable delay based
on a signal from one of our video frame
synchronizers, enabling you to adjust for a
large, fixed lip sync error while continuously
adjusting audio delay to match the video
delay created by the frame sync. The
8920ADT also provides various modes of
controlling the output audio signal such as
channel swapping, channel summing, and
phase inversion.
+
Filter
Analog 1
+
Filter
Analog 2
Loopthrough
Reference Input
RS-232
Delay Control I/F
Buffered
Performance
Signal/noise ratio:
• >102 dB, 20 Hz to 20 kHz
• >105 dB "A" weighted
THD+noise, 20 Hz to 20 kHz: <0.005%,
20 Hz to 20 kHz, +24 dBu
Interchannel crosstalk: <–95 dB, 20 Hz to 20 kHz
Frequency response: ±0.05 dB relative to 1 kHz,
20 Hz to 20 kHz
Delay: Maximum: 1365 ms
Delay increments: 2 ms
Operating temperature: 0° to 45°C
Humidity range: 0% to 90% non-condensing
Indicators and Controls
Indicators: Tracking, level, remote override, power,
communications active, CH1 and CH2 >–20 dBFS,
CH1 and CH2 >–0.5 dBFS, clip level, internal fault,
ref. locked, remote lock out
Controls: Level, delay
Remote: All controls and indicators via Ethernet
8900V-R
J1
Left
Analog
Input
J3
Delay
J5
Control
Input
Delay
J7
Control
Output
J9
Reference
Input
Loopthru
24-bit
FPGA
Stereo
ADC
Delay
AES or Video
Controller
LEDs
Remote
Ordering Information
This module can be mounted in a GeckoFlex
frame when ordered with the 8900V-R GeckoFlex
Video rear module.
8920ADT
Audio A-to-D converter with autotracking delay 75Ω
unbalanced outputs
8920ADT-110
Audio A-to-D converter with auto-tracking delay 110Ω
balanced output supplied with one each 8900CTB-04
and 8900CTB-02
For detailed specifications, installation, and setup
instructions see:
www.grassvalley.com/docs/modular
J2
Right
Analog
Input
J4
8900CTB-04
J6
connects here
for balanced
analog inputs
AES/EBU
Outputs
J8
J10
Reference
Input
8900CTB-02
connects here
for 110Ω output
Dual 75
AES
TX
Single 110
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