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TDA1591

PLL stereo decoder and noise blanker

NXP Semiconductors. 

Philips Semiconductors

PLL stereo decoder and noise blanker

Product specification

TDA1591

FUNCTIONAL DESCRIPTION

Adapting the MPX input to the level of the FM demodulator

output is realized by the value of input resistor R1

(see Fig.3). The total gain of the stereo decoder is

applicable by varying the feedback resistors R2 and R3

(see Figs 1 and 4).

In mute position and the VCO switched off (pin 7), the

output amplifiers can be used for cassette playback,

AM stereo purpose or other signal sources.

The Stereo Noise Controller (SNC) provides a smooth

mono to stereo take-over (see Fig.5).

For High Cut Control (HCC), the de-emphasis time

constant can be changed to higher values

(see Figs 7 and 8). This function is controlled by an analog

input signal.

The noise blanking facility is achieved by gating the stereo

decoder output signal.

The interference detector generates a gating pulse

preferable forced by the level detector voltage of the IF

part.

LIMITING VALUES

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

SYMBOL

VP

Ptot

Tstg

Tamb

Ves

PARAMETER

supply voltage (pin 5)

total power dissipation

storage temperature

operating ambient temperature

electrostatic handling; note 1

pins 1 and 16

pin 5

all other pins

MIN.

0

0

−55

−40

−400

−300

−600

Note

1. Equivalent to discharging a 200 pF capacitor through a 0 Ω series resistor.

MAX.

13.2

0.25

+150

+85

+400

+300

+600

UNIT

V

W

°C

°C

V

V

V

1996 Sep 02

5

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