TDA7421 datasheet(3/38 Pages) STMICROELECTRONICS

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THERMAL DATA

Symbol

Parameter

Value

Unit

Rth j-amb

Thermal resistance Junction-Ambient

typ.

°C/W

PIN DESCRIPTION

Name

Function

AM MIX1 IN -

Input "-" to the AM 1st mixer (differential input)

AM MIX1 IN +

Input "+" to the AM 1st mixer (differential input)

FM MIX IN -

Input "-" to the FM mixer (differential input)

FM MIX IN +

Input "+" to the FM mixer (differential input)

FM RF AGC IN

Input to the RF AGC circuit

FM AGC OUT

Voltage output to the FM AGC

RF GND

RF circuits ground

VCO B

Local oscillator input to the transistor base (two-pin oscillator)

VCO E

Local oscillator input to the transistor emitter (two-pin oscillator)

OSC GND

Oscillator ground

XTAL D

Crystal oscillator input to MOS drain (two-pin oscillator)

XTAL G

Crystal oscillator input to MOS gate (two-pin oscillator)

OSC VCC

Oscillator positive supply

FM ANT ADJ

Tuning varicap voltage for antenna FM filter

FM RF ADJ

Tuning varicap voltage for RF FM filter

PLL VCC

PLL positive supply

LP OUT

Op Amp output to PLL loop filters

LP IN1

PLL "N. 1" loop filter connection to Op Amp inverting input

LP IN2

PLL "N. 2" loop filter connection to Op Amp inverting input

LP IN3

PLL "N. 3" loop filter connection to Op Amp inverting input

PLL VREF

Voltage reference to Op Amp noninverting input

PLL GND

PLL ground

SLEEP

2C bus disconnect signal

SDA

2C bus data

SCL

2C bus clock

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Tamb

Operating Temperature Range

-40 to 85

°C

Tstg

Storage Temperature Range

-55 to 150

°C

VCC

Analog Supply Voltages (PLL, RF, IF1, IF2, OSC)

10.2

VDD

Digital Supply Voltage

5.5

TDA7421

3/38

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