TDA9840 datasheet(8/28 Pages) PHILIPS

8 / 28 page

1998 Jul 03

Philips Semiconductors

Product speciﬁcation

TV and VTR stereo/dual sound processor

with digital identiﬁcation and I2C-bus control

TDA9840

Power supply

The different supply voltages and currents required for the

analog and digital circuits are derived from an internal

band-gap reference circuit. The AF reference voltage is

⁄2VP. For a fast setting to 1⁄2VP an internal start-up circuit

is added. A good ripple rejection is achieved with the

external capacitor Cref = 100 µF/16 V in conjunction with

the high ohmic input of the 1

⁄2VP pin (pin 6). Additional

DC-load on this pin is prohibited.

Power-on reset

When a power-on reset is activated by switching on the

supply voltage or because of a supply voltage breakdown,

the 117/274 Hz DPLL, the 117/274 Hz integrator and the

registers will be reset. Both AF channels

(Main and SCART) are muted.

Fast mode / test mode

The TDA9840 has a fast mode (test mode) to reduce the

integration time of the 117/274 Hz integrator from

approximately 1 to 0.5 s.

ESD protection

All pins are ESD protected. The protection circuits

represent the latest state of the art.

Internal circuit

The internal pin loading diagram is given in Fig.7.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

Note

1. Charge device model class B: discharging a 200 pF capacitor through a 0

Ω series resistor.

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage (pin 18)

−0.3

voltage at pins 1 and 20

−0.3

5.5

voltage at pins 2 to 15, 17 and 19

−0.3

Tstg

storage temperature

−25

+150

°C

Tamb

operating ambient temperature

+70

°C

Vesd

electrostatic handling for all pins

note 1

−±300

SYMBOL

PARAMETER

VALUE

UNIT

Rth j-a

thermal resistance from junction to ambient in free air

DIP20

K/W

SO20

K/W

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