NTE723 Integrated Circuit FM Sound System Description: The NTE723 is a monolithic integrated circuit FM detector/limiter and audio preamplifier that requires a minimum of external components for operation. It includes three stages of IF limiting and a differential–peak–detection circuit. Features: D Simple detector alignment: one coil D Sensitivity: 3dB limiting voltage 250µV typical at 10.7MHz D Low harmonic distortion D Excellent AM rejection 55dB typ. at 10.7MHz D Internal audio preamplifier Absolute Maximum Ratings: Power Supply Current (Pin5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA Supply Voltage (Pin5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.5V Power Dissipation (Note 1), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 715mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Lead Temperature (During Soldering , 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C Note 1. 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 175°C/W junction to ambient. Electrical Characteristics: (TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit VCC = 8.5V 8.5 15 – mA VCC = 11.2V – 17.5 – mA VCC = 12.5V – 19 29 mA – 6.1 – V – 5.4 – V – 5.2 – V Static Characteristics Supply Current I5 Detector Output Level, High V7 Detector Output Level, Low V8 Audio Amplifier Output V12 VCC = 11.2 Electrical Characteristics (Cont’d): (TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit – 250 600 µV – 55 – dB VO(AF) – 1.5 – V THD – 1 2 % VIN = 100mV, f = 400Hz – 21 – dB VOUT = 2V, f = 400Hz – 1.5 5.0 % Dynamic Characteristics (V+ = 11.2V, fo = 10.7MHz, ∆f = ±75kHz, fm = 400Hz) Input Limiting Threshold VIN(LIM) AM Rejection AMR Recovered AF Voltage (At Pin12) Total Harmonic Distortion AM: 1kHz @ 30%, VIN = 100mV Audio Preamplifier Voltage Gain AV(AF) Total Harmonic Distortion THD Pin Connection Diagram IF Input 1 14 Audio Input IF Input Bias 2 13 Tone Control GND 3 12 Audio Output Zener Regulator 4 11 N.C. VCC 5 10 Detector N.C. 6 9 Detector De–Emphasis 7 8 Buffer Output 14 8 1 7 .300 (7.62) .785 (19.95) Max .200 (5.08) Max .100 (2.45) .600 (15.24) .099 (2.5) Min