TDA9845T datasheet(7/20 Pages) PHILIPS

Il numero della parte	TDA9845T

Spiegazioni elettronici	TV and VTR stereo/dual sound processor with digital identification

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Produttore elettronici	PHILIPS [NXP Semiconductors]

Homepage	http://www.nxp.com

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7 / 20 page

1995 Mar 20

7

Philips Semiconductors

Preliminary speciﬁcation

TV and VTR stereo/dual sound processor

with digital identiﬁcation

TDA9845

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

1

⁄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 7). No additional

DC load on this pin is allowed.

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

logic will be reset. The AF channel (Main) is muted

(

≤1 ms).

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 A: discharging a 200 pF capacitor through a

Ω series resistor.

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

VP

supply voltage (pin 18)

−0.3

10

V

Vi

voltage at pins 1, 2 and 20

−0.3

9.0

V

Vi

voltage at pins 3 to 13, 17 and 19

−0.3

VP

V

Vi

voltage at pins 14 and 15

−0.3

10

V

Tstg

storage temperature

−25

+150

°C

Tamb

operating ambient temperature

0

+70

°C

Vesd

electrostatic handling for all pins

note 1

−500

+500

V

SYMBOL

PARAMETER

VALUE

UNIT

Rth j-a

thermal resistance from junction to ambient in free air

DIP20

73

K/W

SO20

90

K/W

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