Filter
Top Products
1999 Apr 14 22
Philips Semiconductors Product specification
Audio processor with head amplifier for VHS hi-fi TDA9605H
7.4.5 HEAD AMPLIFIER PLAYBACK AMPLIFICATION
Eight settings of playback amplification can be selected for the head amplifier. The amplification values are valid for the
head signals from pins PBIN1 or PBIN2 to the internal node between the head amplifier and HF AGC circuit. The setting
of the playback amplification results in a selection of the hi-fi detection level (auto-normal function). The hi-fi detection
level indicated is the RMS value of the left channel carrier signal on pins PBIN1 and PBIN2.
The signal at the internal node can be monitored for testing purposes via pin ENVOUT using test 8 of the test mode.
It should be noted that the output level of test 8 shows 6 dB attenuation compared to the internal node level.
Table 13 Head amplifier control (bits HAC2, HAC1 and HAC0) in the playback mode
7.4.6 H
EAD AMPLIFIER RECORD CURRENT
A total of twelve settings of the recording current can be selected for the head amplifier record output pin RECOUT.
Bit HRL of the select byte selects between high and low current settings. The recording current is defined as the
peak-to-peak value of the current of the record output signal which includes both the left and right carrier signal.
The selected recording current is independent of the selected record mix ratio setting, but recording is disabled during
the record-mute mode as defined by the bits DOC, SHH and DETH or the control signal on pin RMHID.
Table 14 Head amplifier control (bits HAC2, HAC1 and HAC0) and head record current low (bit HRL) in the record
mode
AFM HAC2 HAC1 HAC0 MODE DESCRIPTION
0 0 0 0 48 dB hi-fi detection level equals 13 µV (RMS) from head
0 0 0 1 51 dB hi-fi detection level equals 9.4 µV (RMS) from head
0 0 1 0 54 dB hi-fi detection level equals 6.7 µV (RMS) from head
0 0 1 1 57 dB hi-fi detection level equals 4.7 µV (RMS) from head
0 1 0 0 60 dB hi-fi detection level equals 3.3 µV (RMS) from head
0 1 0 1 63 dB hi-fi detection level equals 2.4 µV (RMS) from head
0 1 1 0 66 dB hi-fi detection level equals 1.7 µV (RMS) from head
0 1 1 1 69 dB hi-fi detection level equals 1.2 µV (RMS) from head
AFM HAC2 HAC1 HAC0 HRL MODE DESCRIPTION
1000025mA(p-p) high recording current is 25 mA (p-p)
1001030mA(p-p) high recording current is 30 mA (p-p)
1010035mA(p-p) high recording current is 35 mA (p-p)
1011042mA(p-p) high recording current is 42 mA (p-p)
1100050mA(p-p) high recording current is 50 mA (p-p)
1101060mA(p-p) high recording current is 60 mA (p-p)
1110071mA(p-p) high recording current is 71 mA (p-p)
1111084mA(p-p) high recording current is 84 mA (p-p)
1000112.5 mA (p-p) low recording current is 12.5 mA (p-p)
1001115mA(p-p) low recording current is 15 mA (p-p)
1010117.5 mA (p-p) low recording current is 17.5 mA (p-p)
10111 21mA(p-p) low recording current is 21 mA (p-p)