1996 Nov 20

5

Philips Semiconductors

Product specification

Dual channel TV FM intercarrier

sound demodulator

TDA9821

Second sound carrier mute

The output of the second FM demodulator is muted when

the signal level (signal and/or noise) at pin 15 is less than

typically 0.5 mV (RMS value). This avoids an incorrect

stereo or dual sound identification when a mono signal is

transmitted. Therefore, with a mono transmission, there is

no audio output at pin 7. When the signal level at pin 15 is

greater than typically 1.0 mV (RMS value) mute is

switched off.

LIMITING VALUES

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

Notes

1. Equivalent to discharging a 200 pF capacitor via a 0

Ω series resistor.

2. Equivalent to discharging a 100 pF capacitor via a 1.5 k

Ω series resistor.

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage (pin 14)

−0.5

+9.0

V

input signal (pins 1 and 15)

−0.5

+5.0

V

short-circuit time (each pin except pins 13 and 14 to

be tested; one at the time)

−

10

s

storage temperature

device

−25

+125

°C

device in packing

−25

+85

°C

junction temperature

−

150

°C

operating ambient temperature

0

70

°C

electrostatic handling for all pins

note 1

−500

+500

V

note 2

−4000

+4000

V

SYMBOL

PARAMETER

VALUE

UNIT

thermal resistance from junction to ambient in free air

74

K/W