cxa2054s Sony Electronics, cxa2054s Datasheet - Page 20

• Manufacturer Part Number: cxa2054s
• Description: Us Audio Multiplexing Decoder
• Manufacturer: Sony Electronics

Adjustment Method (Adjust this through Tuner and IF when this IC is mounted on the set.)
1. ATT adjustment
2. Stereo, SAP VCO adjustment
3. Stereo, SAP, dbx filter adjustment
4. Separation adjustment
1) TEST BIT is set to “TEST1=0” and “TEST-DA=0”.
2) Input a 100 Hz, 245 mVrms sine wave signal to COMPIN and monitor the TVOUT-L output level. Then,
3) Adjustment range : ±30 %
1) TEST BIT is set to “TEST1=0” and “TEST-DA=1”.
2) Monitor the TVOUT-R output (4 f
3) Adjustment range : ±20 %
1) TEST BIT is set to “TEST1=1” and “TEST-DA=0”.
2) Input a 9.4 kHz, 600 mVrms 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 300
3) Next, set the frequency only of the input signal to 3 kHz and adjust the “SPECTRAL” adjustment data to
4) Then, 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 TVOUT-L output goes to the standard value
(490mVrms).
Adjustment bits :
adjustment data so that this frequency is as close to 4 f
Adjustment bits :
condition, adjust the “FILTER” adjustment data.
Adjustment bits :
Align with the center of the STA5=1 (adjustment OK) condition range.
Hz NR-ON) to COMPIN. At this time, adjust the “WIDEBAND” adjustment data to reduce TVOUT-R
output to the minimum.
reduce TVOUT-R output to the minimum.
Adjustment range : ±30 %
Adjustment bits :
1
0
0
4 bits
6 bits
6 bits
6 bits
H
free running) frequency in a no input state, and adjust “VCO”
“SPECTRAL”
Adjustment range:
Adjustment bits:
Adjustment point
—20—
H
(62.936 kHz) as possible.
±15 %
6 bits
3F
Control data
“FILTER”
Measurement data
STA5 “FILTER”
CXA2054S