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TDA9605H/N1

Audio processor with head amplifier for VHS hi-fi

Philips Electronics 

Philips Semiconductors

Audio processor with head amplifier for VHS hi-fi

Product specification

TDA9605H

FUNCTION

Playback head amplifier disable

Power output muting

Operating mode

MODES

CONTROL BITS

standard operating mode and playback HPD

disabled

power mute

MUTE

standard operating mode, active standby STBP and STBA

and passive standby

7.4 Control byte at subaddress 00H

The control byte is used to set the parameters of hi-fi processing and head amplifier control.

7.4.1 AUDIO FM MODE

Bit AFM controls the main mode of the hi-fi processing and head amplifier. The function of other bits of the control byte

and bit EOS of the output byte depends on the state of bit AFM.

Table 9 Audio FM mode selection (bit AFM)

AFM

MODE

0 playback

1 record

DESCRIPTION

hi-fi processing in playback mode and head amplifier in playback mode

hi-fi processing in record mode and head amplifier is in record mode or record-mute mode

7.4.2 PLAYBACK MODE

When during the playback mode no FM carrier is detected from tape, the normal audio signal on pin LININ is

automatically selected by the output select function.

For this auto-normal mode:

• The timing of the hi-fi carrier detection can be selected via bit DETH which defines the auto-normal release time:

– Fast mode: hi-fi detection delay is 1 to 2 HID control signal periods (for NTSC: 33 to 66 ms; for PAL: 40 to 80 ms)

– Slow mode: hi-fi detection delay is 7 to 8 HID control signal periods (for NTSC: 233 to 267 ms;

for PAL: 280 to 320 ms).

• The state of hi-fi detection and auto-normal can be monitored by I2C-bus control bit AUTN of the read byte.

• In case automatic selection of the normal audio signal is not required the normal input level control can be set to mute

(bits NIL3 to NIL0 of the select byte).

Table 10 Dropout cancelling (bit DOC), sample-and-hold high-state (bit SHH) and detector time hi-fi (bit DETH) in the

playback mode; note 1

AFM DOC SHH DETH

MODE

DESCRIPTION

0 0 X X playback and DOC off

dropout cancelling disabled

0 1 X X playback and DOC on

dropout cancelling active

0X0

X playback and sample-and-hold time = 6 µs head switch noise cancel time set to 6 µs

0X1

X playback and sample-and-hold time = 8 µs head switch noise cancel time set to 8 µs

0 X X 0 playback and hi-fi detect = fast

fast mode hi-fi detector timing

0 X X 1 playback and hi-fi detect = slow

slow mode hi-fi detector timing

Note

1. X = don’t care.

1999 Apr 14

20

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