CXA2074Q/S データシートの表示（PDF） - Sony Semiconductor

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CXA2074Q/S

US Audio Multiplexing Decoder

Sony Semiconductor 

CXA2074Q/S

Adjustment Method (Adjust this IC through Tuner and IF when this IC is mounted on the set.)

1. ATT adjustment

1) TEST BIT is set to “TEST1 = 0” and “TEST-DA = 0”.

2) Input a 100Hz, 245mVrms sine wave signal to COMPIN and monitor the LPOUT-L output level. Then,

adjust the “ATT” data for ATT adjustment so that the LPOUT-L output goes to the standard value

(490mVrms).

3) Adjustment range: ±30%

Adjustment bits: 4 bits

2. Stereo, SAPVCO adjustment

1) TEST BIT is set to “TEST1 = 0” and “TEST-DA = 1”.

2) Monitor the LPOUT-R output (4fH free running) frequency in a no input state, and adjust “VCO”

adjustment data so that this frequency is as close to 4fH (62.936kHz) as possible.

3) Adjustment range: ±20%

Adjustment bits: 6 bits

3. Stereo, SAP block, dbx filter adjustment

1) TEST BIT is set to “TEST1 = 1” and “TEST-DA = 0”.

2) Input a 9.4kHz, 600mVrms sine wave signal to COMPIN. While monitoring the STATUS FLAG (STA5)

condition, adjust the “FILTER” adjustment data.

3) Adjustment range: ±20%

Adjustment bits: 6 bits

Align “FILTER” with the center of the STA5 = 1 (adjustment OK) condition range.

Adjustment point

Control data

0

3F "FILTER"

1

0

Measurement data

STA5 "FILADJ"

4.Separation adjustment

1) TEST BIT is set to “TEST1 = 0” and “TEST-DA = 0”.

2) Set the unit to stereo mode and input the left channel only signal (modulation factor 30%, frequency 300Hz

NR-ON) to COMPIN. At this time, adjust the “WIDEBAND” adjustment data to reduce LPOUT-R output to

the minimum.

3) Next, set the frequency only of the input signal to 3kHz and adjust the “SPECTRAL” adjustment data to

reduce LPOUT-R output to the minimum.

4) The adjustments in 2 and 3 above are performed to optimize the separation.

5) “WIDEBAND”

“SPECTRAL”

Adjustment range: ±30% Adjustment range: ±15%

Adjustment bits: 6 bits Adjustment bits: 6 bits

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