GS2970A datasheet(82/150 Pages) SEMTECH

Part #	GS2970A

Description	3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing

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Manufacturer	SEMTECH [Semtech Corporation]

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82 / 150 page

GS2970A 3Gb/s, HD, SD SDI Receiver

Data Sheet

54244 - 2

September 2012

82 of 150

The timing of the serial audio output signals and the ACLK output signal is shown in

Figure 4-35: ACLK to Data Signal Output Timing.

Figure 4-35:ACLK to Data Signal Output Timing

When AUDIO_EN/DIS is set HIGH, audio extraction is enabled and the audio output

signals are extracted from the video data stream. When set LOW, the serial audio

outputs, ACLK and WCLK outputs are set LOW.

In addition, all functional logic associated with audio extraction is disabled to reduce

power consumption.

WCLK

Word clock

AMCLK

Audio Master Clock, selectable 128fs, 256fs, or 512fs

Table 4-16:Serial Audio Pin Descriptions (Continued)

Audio

Pin Name

Description

I/O Timing Specs:

AOUT*

ACLK

A1

A0

A2

128fs = 162.76ns (AES/EBU)

64fs = 325.52ns (other modes)

20%

80%

tr

20%

80%

tf

A3

Audio Outputs:

toh

tod

toh

tr/tf (min)

Cload

tod

tr/tf (max)

Cload

toh

tr/tf (min)

Cload

tod

tr/tf (max)

Cload

AOUT

1.500ns

0.600ns

6 pF

7.000ns

2.200ns

15 pF

1.500ns

0.600ns

6 pF

7.000ns

2.300ns

15 pF

Audio Outputs

3.3V

1.8V

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