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TDA9615H

13.2 V, audio processor for VHS hi-fi

Philips Electronics 

Philips Semiconductors

Audio processor for VHS hi-fi

Preliminary specification

TDA9615H

Control byte; subaddress 00 (hi-fi and general control)

Table 5 Bits of control byte

BIT

AFM

DOC

SHH

DETH

NTSC

MUTE

STBP

STBA

DESCRIPTION

audio FM mode; see Table 6

dropout cancel; see Table 6

sample-and-hold high-state; see Table 6

detector high; see Table 6

NTSC television system standard; see Table 7

power mute; see Table 8

standby mode passive; see Table 9

standby mode active; see Table 9

Table 6 Bits AFM, DOC, SHH and DETH

AFM

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

1

DOC

X(1)

0

1

X(1)

X(1)

X(1)

X(1)

X(1)

0

0

0

0

1

1

1

1

SHH

X(1)

X(1)

X(1)

0

1

X(1)

X(1)

X(1)

0

0

1

1

0

0

1

1

DETH

MODE

REMARKS

X(1) playback(2)

X(1) playback

DOC off

X(1) playback

DOC on

X(1) playback

X(1) playback

sample-and-

hold time = 6 µs

sample-and-

hold time = 8 µs

0 playback

detect = fast

1 playback

detect = slow

X(1) record/loop-through

0 loop-through(3)(4)

1 record

0 dB mix

0 record

6 dB mix

1 record

8 dB mix

0 record

9.5 dB mix

1 record

11 dB mix

0 record

12.5 dB mix

1 record

13.5 dB mix

DESCRIPTION

hi-fi circuit in playback mode

no dropout cancelling

dropout cancelling active

headswitch noise cancel time is 6 µs

headswitch noise cancel time is 8 µs

hi-fi detector timing: fast mode

hi-fi detector timing: slow mode

hi-fi circuit in record/loop-through mode

no FM output signal (EE mode)

0 dB FM output carrier ratio (1 : 1)

6 dB FM output carrier ratio (1 : 2)

8 dB FM output carrier ratio (1 : 2.5)

standard 9.5 dB FM output carrier ratio (1 : 3)

11 dB FM output carrier ratio (1 : 3.5)

12.5 dB FM output carrier ratio (1 : 4.2)

13.5 dB FM output carrier ratio (1 : 4.7)

Notes

1. X = don’t care.

2. Auto-normal function: if during hi-fi ‘playback’ mode no FM carrier is detected at FMIN (pin 37) the ‘Normal’ mode

audio signal (LININ; pin 21) is automatically selected by the output select function.

a) Hi-fi carrier detection time (i.e. auto-normal release time) can be selected via bit DETH:

‘fast’ mode: 1 to 2 HID periods (33 to 66 ms NTSC, 40 to 80 ms PAL)

‘slow’ mode: 7 to 8 HID periods (233 to 267 ms NTSC, 280 to 320 ms PAL).

b) The status of hi-fi detection can be monitored via the I2C-bus; see bit AUTN of the read byte (see Table 31).

c) If muting is required instead of automatic selection of the ‘Normal’ mode audio signal the normal input level

function should be set to mute; see bits NIL3 to NIL0 of the select byte.

1997 Jun 16

11

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