Philips TDA9605H

1999 Apr 14 42

Philips Semiconductors Product speciﬁcation

Audio processor with head ampliﬁer for VHS hi-ﬁ TDA9605H

Table 41 Test modes for evaluation and measurement purposes

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 6dB 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.

TEST HRL NIL3 NIL2 NIL1 NIL0 MODE DESCRIPTION

100001test1 record mode; left channel FM carrier only (1.3 or1.4 MHz)

100010test2 record mode; right channel FM carrier only (1.7 or1.8 MHz)

100011test3 playback mode; left channel band-pass ﬁlter with HF AGC off;

EOS =1 (test output on pin ENVOUT); notes 1 and2

100100test4 playback mode; right channel band-pass ﬁlter with HF AGC off;

EOS =1 (test output on pin ENVOUT); notes 1 and2

100101test5 playback mode; HF AGC (left channel band-pass ﬁlter);

EOS =1 (test output on pin ENVOUT); notes 1and 2

100110test6 playback mode; HF AGC (right channel band-pass ﬁlter);

EOS =1 (test output on pin ENVOUT); notes 1and 2

101000test8 playback mode; head ampliﬁer output signal;

EOS =1 (test output on pinENVOUT; notes 2and 3

101010test 10 playback mode; HF envelope of right channel carrier;

EOS =1 (test output on pin ENVOUT)

111001test 25 noise reduction and modem; note4

test 25a leftchannel FM modulator (left carrier only);

record mode; volume setting = −3 dB; test input= line input left

test 25b left and right noise reduction (compressor);

record mode;output select function = mute;

test output = line output

test 25c left and right channel FM demodulator; playbackmode;

output select function= mute; test output =line output

111010test 26 noise reduction and modem; note4

test 26a rightchannel FM modulator (right carrier only);

record mode; volume setting = −3 dB; test input= line input right

test 26b left and right channel audio lowpass ﬁlter; recordmode;

volume setting = −3 dB; output select function= mute;

test input= line input; test output = line output

test 26c left and right channel noise reduction (expander); playbackmode;

volume setting = −3 dB; test input= line input; note 5