TDA9605 datasheet(21/52 Pages) PHILIPS

21 / 52 page

1999 Apr 14

Philips Semiconductors

Product speciﬁcation

Audio processor with head ampliﬁer for VHS hi-ﬁ

TDA9605H

7.4.3

RECORD MODE

During the record-mute mode, the recording output current on pin RECOUT is muted and the head amplifier is partly

disabled. The record mode, set by I2C-bus control, can also be changed to the record-mute mode by an external control

signal on pin RMHID. Sometimes the record-mute mode is named loop-through mode or EE mode.

Table 11 Dropout cancelling (bit DOC), sample-and-hold high-state (bit SHH) and detector time hi-ﬁ (bit DETH) in the

record mode

Note

1. Power-on reset state.

7.4.4

SYSTEM STANDARD SELECTION

Bit NTSC selects between the NTSC and PAL (SECAM) system carrier frequencies for the CCO modulators or PLL

demodulators and the band-pass filters. FM carrier frequencies of 1.3 and 1.7 MHz are used for the NTSC system where

1.4 and 1.8 MHz are used for the PAL system. Different code settings for the auto-calibration circuit assure proper

calibration using the standard HID control signal frequency of 29.97 Hz for NTSC mode and 25 Hz for PAL mode. After

auto-calibration is completed bit NTSC enables instant switching between the NTSC and PAL system.

Table 12 System standard selection (bit NTSC)

Note

1. Power-on reset state.

AFM

DOC

SHH

DETH

MODE

DESCRIPTION

1000

record-mute

record-mute and no recording output current; note 1

1001

record and 3 dB mix

recording with 3 dB output carrier ratio (1 : 1.4)

1010

record and 4.5 dB mix

recording with 4.5 dB output carrier ratio (1 : 1.7)

1011

record and 6 dB mix

recording with 6 dB output carrier ratio (1 : 2)

1100

record and 8 dB mix

recording with 8 dB output carrier ratio (1 : 2.5)

1101

record and 9.5 dB mix

recording with 9.5 dB standard output carrier ratio (1 : 3)

1110

record and 11 dB mix

recording with 11 dB output carrier ratio (1 : 3.5)

1111

record and 12.5 dB mix

recording with 12.5 dB output carrier ratio (1 : 4.2)

NTSC

MODE

DESCRIPTION

PAL

hi-ﬁ circuit in PAL mode

NTSC

hi-ﬁ circuit in NTSC mode; note 1

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