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Philips Semiconductors
Audio processor with head amplifier for VHS hi-fi
Table 41 Test modes for evaluation and measurement purposes
TEST HRL NIL3 NIL2 NIL1 NIL0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
1
1
0
1
1
1
1
1
1
1
Notes
1. This test can be used with a HIGH-level input signal by setting bit HPD = 1; test input signal applied to pin HMSW.
2. Auto-normal is activated (bit AUTN = 1) during the test, i.e. the playback audio signal is not available.
3. The output level on pin ENVOUT shows 6 dB attenuation compared to the internal signal of the head amplifier output.
4. This test connects internal signal lines between the noise reduction and (de-)modulator circuit. The signals found
here are not compensated for temperature or tolerance spread and therefore level measurements are only relative.
Absolute values are not an indication of the overall performance. Typical audio level of the test inputs and outputs is
approximately 6.5 dBV for the standard 8 dBV line level and 50 kHz FM deviation.
5. The expander test requires the auto-normal function to be set inactive; i.e. an FM carrier signal should be available.
1999 Apr 14
MODE
0
0
1
test 1
0
1
0
test 2
0
1
1
test 3
1
0
0
test 4
1
0
1
test 5
1
1
0
test 6
0
0
0
test 8
0
1
0
test 10
0
0
1
test 25
test 25a left channel FM modulator (left carrier only);
test 25b left and right noise reduction (compressor);
test 25c left and right channel FM demodulator; playback mode;
0
1
0
test 26
test 26a right channel FM modulator (right carrier only);
test 26b left and right channel audio lowpass filter; record mode;
test 26c left and right channel noise reduction (expander); playback mode;
record mode; left channel FM carrier only (1.3 or 1.4 MHz)
record mode; right channel FM carrier only (1.7 or 1.8 MHz)
playback mode; left channel band-pass filter with HF AGC off;
EOS = 1 (test output on pin ENVOUT); notes 1 and 2
playback mode; right channel band-pass filter with HF AGC off;
EOS = 1 (test output on pin ENVOUT); notes 1 and 2
playback mode; HF AGC (left channel band-pass filter);
EOS = 1 (test output on pin ENVOUT); notes 1 and 2
playback mode; HF AGC (right channel band-pass filter);
EOS = 1 (test output on pin ENVOUT); notes 1 and 2
playback mode; head amplifier output signal;
EOS = 1 (test output on pin ENVOUT; notes 2 and 3
playback mode; HF envelope of right channel carrier;
EOS = 1 (test output on pin ENVOUT)
noise reduction and modem; note 4
record mode; volume setting = 3 dB; test input = line input left
record mode; output select function = mute;
test output = line output
output select function = mute; test output = line output
noise reduction and modem; note 4
record mode; volume setting = 3 dB; test input = line input right
volume setting = 3 dB; output select function = mute;
test input = line input; test output = line output
volume setting = 3 dB; test input = line input; note 5
42
Product specification
TDA9605H
DESCRIPTION
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