Grass valley 8920ADT DATASHEET

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

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.

8900V-R

	J1	J2
Left			Right
Analog			Analog
Input	J3	J4	Input

Delay	J5	J6		8900CTB-04
				connects here
Control
				for balanced
Input
			AES/EBU	analog inputs
Delay	J7	J8	Outputs
Control
Output
	J9	J10
Reference			Reference
Input			Input
	Loopthru			8900CTB-02
				connects here
				for 110Ω output

+	Filter	24-bit		AES	Dual 75
Analog 1			FPGA	TX	Single 110
		Stereo
+
	Filter	ADC		Delay
Analog 2
Loopthrough
Reference Input	AES or Video

RS-232	Delay Control I/F	Controller
		LEDs
	Buffered
		Remote

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