LM3189 FM IF System. General Description. Provides a specific circuit for flexible audio output

                                                                          April 1987

LM3189 FM IF System

General Description                                               Features

The LM3189N is a monolithic integrated circuit that provides ^Y Exceptional limiting sensitivity: 12 mV typ at ^b3 dB all the functions of a comprehensive FM IF system. The point

block diagram of the LM3189N includes a three stage FM IF ^Y Low distortion: 0.1% typ (with double-tuned coil) amplifier/limiter configuration with level detectors for each Y Single-coil tuning capability stage, a doubly balanced quadrature FM detector and an Y Improved (S a N)/N ratio audio amplifier that features the optional use of a muting Y Externally programmable recovered audio level

(squelch) circuit.

^Y Provides specific signal for control of inter-channel mutThe advanced circuit design of the IF system includes desir- ing (squelch) able deluxe features such as programmable delayed AGC Y Provides specific signal for direct drive of a tuning mefor the RF tuner, an AFC drive circuit, and an output signal ter to drive a tuning meter and/or provide stereo switching log^Y On channel step for search control

ic. In addition, internal power supply regulators maintain a

^Y Provides programmable AGC voltage for RF amplifier nearly constant current drain over the voltage supply range

_of a_{8.5V to} a_16V.                                                                                        ^Y Provides a specific circuit for flexible audio output

^Y Internal supply voltage regulators

The LM3189N is ideal for high fidelity operation. Distortion

in an LM3189N FM IF system is primarily a function of the Y Externally programmable ON channel step width, and phase linearity characteristic of the outboard detector coil. ^{deviation at which muting occurs}

The LM3189N has all the features of the LM3089N plus additions.

The LM3189N utilizes the 16-lead dual-in-line plastic package and can operate over the ambient temperature range of ^b40§C to ^a85§C.

Block Diagram

TL/H/7960–1

All resistance values are in X

*L tunes with 100 pF (C) at 10.7 MHz, Q₀ ^j 75 (Toko No. KACS K586HM or equivalent)

Absolute Maximum Ratings

If Military/Aerospace specified devices are required, Power Dissipation (Note 2) 1500 mW please contact the National Semiconductor Sales Operating Temperature Range b40§C to a85§C

Office/Distributors for availability and specifications.

Storage Temperature Range                          ^b65§C to ^a150§C

Supply Voltage Between Pin 11 and Pins 4, 14                     16V

Lead Temperature (Soldering, 10 sec.)                              260§C

DC Current Out of Pin 12                                                     5 mA

DC Current Out of Pin 13                                                     5 mA

DC Current Out of Pin 15                                                     2 mA

Electrical Characteristics T_A ^e 25§C, V^ae 12V

Symbol

Parameter

Conditions

(See Single-Tuned Test Circuit)

Min

Typ

Max

Units

STATIC (DC) CHARACTERISTICS

I11

Quiescent Circuit Current

20

31

44

mA

DC Voltages:

V1

Terminal 1 (IF Input)

1.2

2.0

2.4

V

V2

Terminal 2 (AC Return to Input)

No Signal Input, Non Muted

1.2

2.0

2.4

V

V3

Terminal 3 (DC Bias to Input)

1.2

2.0

2.4

V

V15

Terminal 15 (RF AGC)

7.5

9.5

11

V

V10

Terminal 10 (DC Reference)

5

5.75

6

V

DYNAMIC CHARACTERISTICS

VI(lim)

Input Limiting Voltage (^b3 dB Point)

f_o ^e 10.7 MHz,

12

25

mV

AMR

AM Rejection (Term. 6)

VIN e 0.1V

AM Mod. ^e 30%

45

55

dB

VO(AF)

Recovered AF Voltage (Term. 6)

325

500

650

mV

THD

Total Harmonic Distortion (Note 1)

fmod e 400 Hz,

Single Tuned (Term. 6)

Deviation g75 kHz

0.5

1

%

Double Tuned (Term. 6)

VIN e 0.1V

0.1

%

S ^a N/N

Signal Plus Noise to Noise Ratio

(Term. 6)

65

80

dB

fDEV

Deviation Mute Frequency

fmod ^e 0

^g40

kHz

V16

RF AGC Threshold

1.25

V

V12

On Channel Step

VIN e 0.1V

fDEV kg40 kHz fDEV lg40 kHz

0 5.6

V

Note 1: THD characteristics are essentially a function of the phase characteristics of the network connected between terminals 8, 9, and 10.

Note 2: For operation in ambient temperatures above 25§C, the device must be derated based on a 150§C maximum junction temperature and a thermal resistance of 80§C/W junction to ambient.

Connection Diagram

Dual-In-Line Package

TL/H/7960–2

Top View

Order Number LM3189N

See NS Package Number N16E