tl/h/7960 LM3189 fm if system april 1987 LM3189 fm if system general description 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 desir- able 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 log- ic. 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 pack- age and can operate over the ambient temperature range of b 40 cto a 85 c. features y exceptional limiting sensitivity: 12 m v typ at b 3db point y low distortion: 0.1% typ (with double-tuned coil) y single-coil tuning capability y improved (s a n)/n ratio y externally programmable recovered audio level y provides specific signal for control of inter-channel mut- ing (squelch) y provides specific signal for direct drive of a tuning me- ter y on channel step for search control y provides programmable agc voltage for rf amplifier y provides a specific circuit for flexible audio output y internal supply voltage regulators y 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, q 0 j 75 (toko no. kacs k586hm or equivalent) c 1995 national semiconductor corporation rrd-b30m115/printed in u. s. a.
absolute maximum ratings 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 16v dc current out of pin 12 5 ma dc current out of pin 13 5 ma dc current out of pin 15 2 ma power dissipation (note 2) 1500 mw operating temperature range b 40 cto a 85 c storage temperature range b 65 cto a 150 c lead temperature (soldering, 10 sec.) 260 c electrical characteristics t a e 25 c, v a e 12v symbol parameter conditions min typ max units (see single-tuned test circuit) static (dc) characteristics i 11 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 v i (lim) input limiting voltage ( b 3 db point) 12 25 m v amr am rejection (term. 6) v in e 0.1v 45 55 db v o (af) recovered af voltage (term. 6) am mod. e 30% f o e 10.7 mhz, 325 500 650 mv thd total harmonic distortion (note 1) f mod e 400 hz, single tuned (term. 6) deviation g 75 khz 0.5 1 % double tuned (term. 6) v in e 0.1v 0.1 % s a n/n signal plus noise to noise ratio 65 80 db (term. 6) f dev deviation mute frequency f mod e 0 g 40 khz v16 rf agc threshold 1.25 v v12 on channel step v in e 0.1v f dev k g 40 khz 0 v f dev l g 40 khz 5.6 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, q o (unloaded) j 75 (toko no. kacs k586hm or equivalent) ** c e 0.01 m f for 50 m s de-emphasis (europe) e 0.015 m f for 75 m s de-emphasis (usa) tl/h/7960 3 test circuit for LM3189n using a double-tuned detector coil all resistance values are in x * t:prieq o (unloadede j 75 (tunes with 100 pf (c12)) 20t of 34e on 7/32 dia form seceq o (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 (v c ) e 150 mv above values permit proper operation of mute (squelch) circuit ``e'' type slugs, spacing 4 mm ** c e 0.01 m f for 50 m s de-emphasis (europe) e 0.015 m f for 75 m s de-emphasis (usa) tl/h/7960 4 3
complete fm if system for high quality tuners 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 receiver requirements. see graph for typical limiting and noise characteristics for each circuit configuration which can be compared to the LM3189n alone. 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 q o (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 if input signal am rejection (30% mod) vs (pin 12) vs if input signal mute control output voltage (pin 5) (pin 6) vs mute input typical audio attenuation of input signal voltage meter output as a function muting action, tuner agc, and tuning of change in frequency) at term 7 as a function afc characteristics (current a function of load resistance deviation mute threshold as (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. as used herein: 1. life support devices or systems are devices or 2. a critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. national semiconductor national semiconductor national semiconductor national semiconductor corporation europe hong kong ltd. japan ltd. 1111 west bardin road fax: ( a 49) 0-180-530 85 86 13th floor, straight block, tel: 81-043-299-2309 arlington, tx 76017 email: cnjwge @ tevm2.nsc.com ocean centre, 5 canton rd. fax: 81-043-299-2408 tel: 1(800) 272-9959 deutsch tel: ( a 49) 0-180-530 85 85 tsimshatsui, kowloon fax: 1(800) 737-7018 english tel: ( a 49) 0-180-532 78 32 hong kong fran 3 ais tel: ( a 49) 0-180-532 93 58 tel: (852) 2737-1600 italiano tel: ( a 49) 0-180-534 16 80 fax: (852) 2736-9960 national does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and national reserves the right at any time without notice to change said circuitry and specifications.
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