TDA9614H datasheet(13/60 Pages) PHILIPS

13 / 60 page

1995 Mar 21

Philips Semiconductors

Preliminary speciﬁcation

Audio processor for VHS hi-ﬁ

and linear audio

TDA9614H

Fig.4 Timing diagram of automatic calibration.

handbook, full pagewidth

MBE281

max 240 ms

max 10 ms

HID

CALS

LEFT

OSCILLATOR

RIGHT

OSCILLATOR

CALR

BANDPASS

FILTERS

If CALS is reset during CALR = 0, the calibration will be

stopped if it was not finished yet. If required, a new

calibration can be started using CALS.

WARNING: the IC should not be calibrated in a test or

standby mode.

6.3.4

PAL/NTSC MODE

Depending on bit NTSC the IC is calibrated in PAL or

NTSC mode using bit CALS. After an automatic calibration

the oscillator frequencies can be switched between PAL

and NTSC using bit NTSC. This centre frequency shift is

done without automatic calibration. During playback (PB)

or loop-through (LT) a change in bit NTSC will

automatically calibrate the bandpass filters again. This will

take <10 ms.

WARNING: A change of PB to REC, LT to REC and

PAL to NTSC should not be combined in one transmitted

byte. The PAL to NTSC transition should be preceded by

the PB to REC or LT to REC transition.

6.4

I2C-bus

The TDA9614H is controlled via the 2-wire I2C-bus, in

accordance with the I2C-bus specification. As slave

receiver for programming there is one module address,

with R/W bit = 0, a subaddress byte and eight data bytes.

If more than one data byte follows the subaddress, these

bytes are stored in the successive registers by the

automatic address increment feature. As slave transmitter

(R/W bit = 1) there is one read byte.

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