TDA9605 datasheet(13/52 Pages) PHILIPS

13 / 52 page

1999 Apr 14

Philips Semiconductors

Product speciﬁcation

Audio processor with head ampliﬁer for VHS hi-ﬁ

TDA9605H

Otherwise, the audio envelope output voltage may

become >2.5 V which makes it impossible to detect the

completion of the calibration on pin ENVOUT.

Calibration relies upon the frequency accuracy of the HID

control signal. The calibration result may be incorrect

when the HID control signal is disturbed during a critical

part of the calibration. An additional check is incorporated

to detect such a situation by reading bit CALE during

calibration. When bit CALE = 1, the calibration result is

detected to be unreliable due to external causes. A new

auto-calibration can be started by setting bit CALS = 0

followed by setting bit CALS = 1. Bit CALE always reads

logic 1 when bit CALS is logic 0.

The oscillators and band-pass filters can be switched

between NTSC and PAL system frequencies after a

calibration in NTSC or PAL mode without the need of

additional calibration. Switching between these system

modes is executed immediately and can be done in any

operating mode. The frequency accuracy of system

switching is 100

±3 kHz for both carriers. To obtain the

best possible frequency accuracy in the record mode it is

good practice to recalibrate after system switching.

6.6

Power muting

Switching off and on of the power supply voltage or using

the built-in passive standby mode results in rising and

dropping of the output DC voltages and causes strong

disturbances on the output pins. The TDA9605H includes

three integrated mute switches to block such disturbances

so avoiding the need for an external mute circuit. Pop-free

line and RF converter output signals are realized by

connecting the integrated power mute switches behind the

line and RFC output capacitors.

Power muting is active when bit MUTE = 1 (see Fig.8).

Power muting is automatically activated when VCC is

switched on, because this situation is the Power-on reset

default state. The integrated mute switches on

pins MUTEC, MUTEL and MUTER are closed and form a

low-impedance path to ground. Furthermore, the

pins RFCOUT, LINEL and LINER are current limited to

−1 mA to avoid excessive supply currents and to achieve

good noise attenuation without the need for a series

resistor between the output and mute pins. Pins DECL and

DECR are also current limited for using the integrated

power mute switches or for assisting external muting.

Fig.8 Examples of power mute control and the auto-mute function.

handbook, full pagewidth

MGR843

VCC

auto-mute

(VCC < 7 V)

bit MUTE (I2C-bus)

(1)

bit STBP (I2C-bus)

MUTEC

MUTEL

MUTER

RFCOUT

LINEL

LINER

output signal

with power mute

tmute

auto-mute

active

operation

power

off

power

off

active

operation

power off

(standby)

active

operation

passive

standby

(1) Power-on reset.

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