Grass valley 8920ADT DATASHEET

Ω

Ω

Delay Control I/F

Loopthrough

Reference Input

AES or Video

LEDs

Filter

Analog 1

Analog 2

Filter

Delay

Controller

FPGA

Remote

Buffered

RS-232

24-bit
Stereo

ADC

Dual 75

Single 110

AES

TX

+

+

12

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

8900V-R

Left

Analog

Input

Delay

Control

Input

Delay

Control

Output

AES/EBU
Outputs

Reference
Input

Reference

Input

Loopthru

Right
Analog
Input

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

The 8920ADT takes the best features of
our 8920ADC and 8916, and incorporates
them into one cost-effective, space­saving 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.

8900CTB-04
connects here
for balanced
analog inputs

8900CTB-02
connects here
for 110Ω output

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)

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

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