cxa2074q Sony Electronics, cxa2074q Datasheet - Page 21

• Manufacturer Part Number: cxa2074q
• Description: Us Audio Multiplexing Decoder
• Manufacturer: Sony Electronics

Adjustment Method (Adjust this IC through Tuner and IF when this IC is mounted on the set.)
1. ATT adjustment
2. Stereo, SAPVCO adjustment
3. Stereo, SAP block, dbx filter adjustment
4.Separation 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,
3) Adjustment range: ±30%
1) TEST BIT is set to “TEST1 = 0” and “TEST-DA = 1”.
2) Monitor the LPOUT-R output (4f
3) Adjustment range: ±20%
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)
3) Adjustment range: ±20%
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
3) Next, set the frequency only of the input signal to 3kHz and adjust the “SPECTRAL” adjustment data to
4) The adjustments in 2 and 3 above are performed to optimize the separation.
5) “WIDEBAND”
adjust the “ATT” data for ATT adjustment so that the LPOUT-L output goes to the standard value
(490mVrms).
Adjustment bits:
adjustment data so that this frequency is as close to 4f
Adjustment bits:
condition, adjust the “FILTER” adjustment data.
Adjustment bits:
Align “FILTER” with the center of the STA5 = 1 (adjustment OK) condition range.
NR-ON) to COMPIN. At this time, adjust the “WIDEBAND” adjustment data to reduce LPOUT-R output to
the minimum.
reduce LPOUT-R output to the minimum.
Adjustment range: ±30%
Adjustment bits:
1
0
0
6 bits
4 bits
6 bits
6 bits
“SPECTRAL”
Adjustment range: ±15%
Adjustment bits:
H
free running) frequency in a no input state, and adjust “VCO”
Adjustment point
– 21 –
6 bits
H
(62.936kHz) as possible.
3F
Control data
"FILTER"
Measurement data
STA5 "FILADJ"
CXA2074Q/S