LM3189 FM IF System General Description Features The LM3189N is a monolithic integrated circuit that provides all the functions of a comprehensive FM IF system. The block diagram of the LM3189N includes a three stage FM IF amplifier/limiter configuration with level detectors for each stage, a doubly balanced quadrature FM detector and an audio amplifier that features the optional use of a muting (squelch) circuit. The advanced circuit design of the IF system includes desirable deluxe features such as programmable delayed AGC for the RF tuner, an AFC drive circuit, and an output signal to drive a tuning meter and/or provide stereo switching logic. In addition, internal power supply regulators maintain a nearly constant current drain over the voltage supply range of a 8.5V to a 16V. The LM3189N is ideal for high fidelity operation. Distortion in an LM3189N FM IF system is primarily a function of the phase linearity characteristic of the outboard detector coil. 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 b 40§ C to a 85§ C. Y Y Y Y Y Y Y Y Y Y Y Y Exceptional limiting sensitivity: 12 mV typ at b3 dB point Low distortion: 0.1% typ (with double-tuned coil) Single-coil tuning capability Improved (S a N)/N ratio Externally programmable recovered audio level Provides specific signal for control of inter-channel muting (squelch) Provides specific signal for direct drive of a tuning meter On channel step for search control Provides programmable AGC voltage for RF amplifier Provides a specific circuit for flexible audio output Internal supply voltage regulators Externally programmable ON channel step width, and deviation at which muting occurs 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) C1995 National Semiconductor Corporation TL/H/7960 RRD-B30M115/Printed in U. S. A. LM3189 FM IF System April 1987 Absolute Maximum Ratings Power Dissipation (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage Between Pin 11 and Pins 4, 14 DC Current Out of Pin 12 DC Current Out of Pin 13 DC Current Out of Pin 15 1500 mW Operating Temperature Range b 40§ C to a 85§ C Storage Temperature Range Lead Temperature (Soldering, 10 sec.) 16V 5 mA 5 mA 2 mA b 65§ C to a 150§ C 260§ C Electrical Characteristics TA e 25§ C, V a e 12V Symbol Conditions (See Single-Tuned Test Circuit) Parameter Min Typ Max Units 20 31 44 mA 1.2 1.2 1.2 7.5 5 2.0 2.0 2.0 9.5 5.75 2.4 2.4 2.4 11 6 V V V V V 12 25 mV STATIC (DC) CHARACTERISTICS I11 Quiescent Circuit Current V1 V2 V3 V15 V10 DC Voltages: Terminal 1 (IF Input) Terminal 2 (AC Return to Input) Terminal 3 (DC Bias to Input) Terminal 15 (RF AGC) Terminal 10 (DC Reference) No Signal Input, Non Muted DYNAMIC CHARACTERISTICS VI(lim) Input Limiting Voltage (b3 dB Point) AMR AM Rejection (Term. 6) VIN e 0.1V 45 55 VO(AF) Recovered AF Voltage (Term. 6) AM Mod. e 30% 325 500 650 mV THD Total Harmonic Distortion (Note 1) Single Tuned (Term. 6) Double Tuned (Term. 6) 0.5 0.1 1 % % S a N/N Signal Plus Noise to Noise Ratio (Term. 6) fDEV Deviation Mute Frequency V16 RF AGC Threshold V12 On Channel Step fo e 10.7 MHz, fmod e 400 Hz, Deviation g 75 kHz VIN e 0.1V 65 fmod e 0 VIN e 0.1V fDEV k g 40 kHz fDEV l g 40 kHz dB 80 dB g 40 kHz 1.25 V 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 2 Test Circuits Test Circuit for LM3189N Using a Single-Tuned Detector Coil All resistance values are in X *L tunes with 100 pF (C) at 10.7 MHz, Qo(unloaded) j 75 (Toko No. KACS K586HM or equivalent) **C e 0.01 mF for 50 ms de-emphasis (Europe) e 0.015 mF for 75 ms de-emphasis (USA) TL/H/7960 – 3 Test Circuit for LM3189N Using a Double-Tuned Detector Coil All resistance values are in X *T:PRIÐQo(unloadedÐ j 75 (tunes with 100 pF (C12)) 20t of 34e on 7/32× dia form SECÐQo(unloaded) j 75 (tunes with 100 pF (C2)) 20t of 34e on 7/32× dia form kQ(percent of critical coupling) j 70% (adjusted for coil voltage (VC) e 150 mV Above values permit proper operation of mute (squelch) circuit ‘‘E’’ type slugs, spacing 4 mm **C e 0.01 mF for 50 ms de-emphasis (Europe) e 0.015 mF for 75 ms de-emphasis (USA) TL/H/7960 – 4 3 Complete FM IF System for High Quality Tuners receiver requirements. See graph for Typical Limiting and Noise Characteristics for each circuit configuration which can be compared to the LM3189N alone. The circuit provides a complete FM IF system for a high quality receiver. Either one or two stages of amplification and bandpass filtering may be desired, depening on the Complete FM IF System for High Quality Receivers All resistance values are in X CF: Ceramic filters, Toko CSFE or equivalent *L tunes with 100 pF (C) at 10.7 MHz Qo(unloaded) j 75 (Toko No. KACS K586 HM or equivalent) TL/H/7960 – 5 Printed Circuit Board and Component Layout TL/H/7960 – 6 Component Side 4 Typical Performance Characteristics AM Rejection (30% Mod) vs IF Input Signal Mute Control Output (Pin 12) vs IF Input Signal Typical Audio Attenuation (Pin 6) vs Mute Input Voltage (Pin 5) Muting Action, Tuner AGC, and Tuning Meter Output as a Function of Input Signal Voltage AFC Characteristics (Current at Term 7 as a Function of Change in Frequency) Deviation Mute Threshold as a Function of Load Resistance (Between Term 7 and Term 10) Typical Limiting and Noise Characteristics TL/H/7960 – 7 5 Schematic Diagram TL/H/7960 – 8 6 Schematic Diagram (Continued) TL/H/7960 – 9 7 LM3189 FM IF System Physical Dimensions inches (millimeters) Dual-In-Line Package (N) Order Number LM3189N See NS Package Number N16E LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. 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