LM1800 Phase-Locked Loop FM Stereo Demodulator General Description Features The LM1800 is a second generation integrated FM stereo demodulator using phase locked loop techniques to regenerate the 38 kHz subcarrier. The numerous features integrated on the die make possible a system delivering high fidelity sound while still meeting the cost requirements of inexpensive stereo receivers. More information available in AN-81. Y Y Y Y Y Y Automatic stereo/monaural switching 45 dB power supply rejection No coils, all tuning performed with single potentiometer Wide operating supply voltage range Excellent channel separation Emitter follower output buffers Connection Diagram Order Number LM1800N See NS Package Number N16A TL/H/7888 – 1 Top View Typical Application TL/H/7888 – 2 C1995 National Semiconductor Corporation TL/H/7888 RRD-B30M115/Printed in U. S. A. LM1800 Phase-Locked Loop FM Stereo Demodulator April 1987 Absolute Maximum Ratings Operating Temperature Range If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Operating Supply Voltage Range Supply Voltage Power Dissipation (Note 3) Lead Temperature (Soldering, 10 sec) Storage Temperature Range 18V 1500 mW 0§ C to a 70§ C a 10V to a 18V b 65§ C to a 150§ C 260§ C Electrical Characteristics (Note 1) Parameter Conditions Supply Current Lamp ‘‘Off’’ Lamp Driver Saturation 100 mA Lamp Current Min Lamp Driver Leakage Max Units 21 30 mA 1.3 1.8 1.0 Pilot Level for Lamp ‘‘ON’’ Pin 11 Adjusted to 19.00 kHz Pilot Level for Lamp ‘‘OFF’’ Pin 11 Adjusted to 19.00 kHz Stereo Lamp Hysteresis Stereo Channel Separation Typ 100 Hz (Note 2) 1000 Hz (Note 2) 10000 Hz (Note 2) Monaural Channel Unbalance 200 mVrms, 1000 Hz Input Monaural Voltage Gain 200 mVrms, 400 Hz Input Total Harmonic Distortion 500 mVrms, 1000 Hz Input Total Harmonic Distortion 500 mVrms, 1000 Hz Input, 1800A Only Capture Range 25 mVrms of Pilot Supply Ripple Rejection 200 mVrms of 200 Hz Ripple 15 Dynamic Output Resistance 20 mVrms 3.0 7.0 mVrms 3.0 6.0 dB 30 40 45 45 dB dB dB 0.3 1.5 dB 140 200 260 mVrms 0.4 1.0 % 0.1 g 2.0 Dynamic Input Resistance V nA 0.3 % g 6.0 % of fo 35 45 dB 20 45 kX 900 1300 2000 X SCA Rejection (Note 4) 70 dB Ultrasonic Freq. Rejection Combined 19 and 38 kHz, Ref. to Output 33 dB Note 1: TA e 25§ C and V a e 12V unless otherwise stated. Note 2: The stereo input signal is made by summing 123 mVrms LEFT or RIGHT modulated signal with 25 mVrms of 19 kHz pilot tone, measuring all voltages with an average responding meter calibrated in rms. The resulting waveform is about 800 mVp-p. Note 3: 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. Note 4: Measured with a stereo composite signal consistency of 80% stereo, 10% pilot and 10% SCA as defined in the FCC Rules on Broadcasting. Note 5: VCO ‘‘OFF’’ curve represents the distortion attainable using good 19 kHz and 38 kHz filters. 2 Typical Performance Characteristics Supply Ripple Rejection Channel Separation TL/H/7888 – 4 TL/H/7888 – 3 Monaural Distortion vs Input Amplitude Monaural Distortion vs Frequency TL/H/7888 – 5 TL/H/7888 – 6 3 LM1800 Phase-Locked Loop FM Stereo Demodulator Physical Dimensions inches (millimeters) Molded Dual-In-Line Package (N) Order Number LM1800N NS Package Number N16A 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 systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Europe Fax: (a49) 0-180-530 85 86 Email: cnjwge @ tevm2.nsc.com Deutsch Tel: (a49) 0-180-530 85 85 English Tel: (a49) 0-180-532 78 32 Fran3ais Tel: (a49) 0-180-532 93 58 Italiano Tel: (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-043-299-2309 Fax: 81-043-299-2408 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.