TDA3845 datasheet(2/18 Pages) PHILIPS

2 / 18 page

January 1993

Philips Semiconductors

Objective speciﬁcation

Quasi split-sound circuit and AM

demodulator

TDA3845; TDA3845T

FEATURES

• Power supply from 5 V (200 mW) to 8 V source also an

alternative 12 V source (12 V not for TDA3845T)

• Gain controlled wideband IF amplifier (AC coupled with

three stages)

• High precision internal 90° phase shifter for quadrature

demodulator

• Amplitude detector for gain control which operates as a

peak detector for FM sound and as a mean level

detector for AM sound (switchable)

• In-phase wideband synchronous demodulator for AM

detection

• Stabilizer circuit for ripple rejection and constant output

signals

• ESD protection for all pins

• Suitable for all FM standards and L as well as L-accent

standard

• NICAM compatible.

GENERAL DESCRIPTION

The TDA3845 is a quasi split-sound IF circuit which is

designed to provide high performance television FM/AM

sound.

QUICK REFERENCE DATA

ORDERING INFORMATION

Note

1. SOT38-1; 1996 November 28.

2. SOT109-1; 1996 November 28.

SYMBOL

PARAMETER

MIN.

TYP.

MAX.

UNIT

positive supply voltage

VP1

pin 14

4.5

5.0

8.8

VP2

pin 11 (not for TDA3845T)

10.8

12.0

13.2

supply current

−

V1-16(RMS)

minimum IF input voltage (RMS value)

−

100

µV

IF control range

−

V12-13(RMS)

intercarrier output voltage 5.5 MHz (RMS value)

100

−

(S +W)/W

signal-to-weighted-noise ratio

(relative to 1 kHz; 50 kHz deviation)

at 5.5 MHz for 2T/20T

−

at 5.742 MHz for 2T/20T

−

V6-13(RMS)

AF output voltage AM (RMS value)

440

550

660

(S +W)/W

signal-to-weighted-noise ratio; AM mode

−

THD

total harmonic distortion; AM mode

−

12%

Tamb

operating ambient temperature

−

+70

°C

EXTENDED

TYPE NUMBER

PACKAGE

PINS

PIN POSITION

MATERIAL

CODE

TDA3845

DIL

plastic

SOT38(1)

TDA3845T

SO16

plastic

SOT109A(2)

TDA3845 Datasheet(PDF) 2 Page - NXP Semiconductors

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