NTE1608 Integrated Circuit AM Tuner w/Electronic Tuning Description: The NTE1608 is a high performance integrated circuit in a 20–Lead DIP type package to be used as an AM electronic tuner. It provides an automatic search–stop signal, local oscillator buffer–output, and the low level local oscillation, as well as providing all other functions required of an AM tuner. Moreover, the stable local oscillation from LW to SW facilities the use of many bands. Functions: D RF Amplifier D IF Amplifier D MIX D AGC D OSC (with ALC) D Detection D Local Oscillation Buffer–Output D Signal Meter Driving Output (also used as an Automatic Search Stop–Signal). Features: D Narrow–Band Signal Meter: Available as an automatic search–stop signal (also available as a wide–band signal meter). Signal meter output = 1/2 frequency ± 1.5kHz typ. D Local Oscillation Buffer–Output:: Facilitates the design of electronic tuning systems and frequency representation. D OSC (with ALC): The oscillation output has been stabilized at a low level (350mVrms) for a varactor diode, and tracking error has been minimized. D RF Amplifier: Excellent in usable sensitivity by incorporating low–noise transistors in cascode circuit (45dB/m typ) D MIX: Double balanced differential MIX prevents the influence of spurious radiation and IF interferences (IF interference = 85dB typ) D Low Noise: Excellent in S/N for intermediate input (57dB typ). D Compensation for VCC Fluctuation: Allows little gain fluctuation and little distortion fluctuation (8 to 16V). D Low Shock Noise: Able to decrease the shock noise by selecting AGC time constant when changing VCC–on and/or switching the mode. Electrical Characteristics: (TA = +25°C unless otherwise specified) Supply Voltage (Pin8, Pin14), VCCmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Output Voltage (Pin5, Pin7), Vo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24V Input Voltage (Pin3), Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6V Supply Current (Pin5 + Pin7 + Pin8 + Pin14), ICCmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32mA Output High Drive Current (Pin18), I18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Output High Drive Current (Pin20), I20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA Allowable Power Dissipation, PDmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Recommended Operating Condition: (TA = +25°C unless otherwise specified) Recommended Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Electrical Characteristics: (TA = +25°C, VCC = 12V, fr = 1MHz, fm = 400Hz unless otherwise specified) Parameter Symbol Current Dissipation Detector Output Signal–to–Noise Ratio Total Harmonic Distortion Signal Meter Output ICC vo S/N Test Conditions Min Typ Max Unit Quiescent 16 25 35 mA With 107dBµ Input 19 29 40 mA With 23dBµ Input, MOD = 30% –27.5 –23.0 –18.5 dBm With 80dBµ Input, MOD = 30% –15.5 –12.5 –9.5 dBm With 23dBµ Input, MOD = 30% 16 20 – dB With 80dBµ Input, MOD = 30% 52 57 – dB With 80dBµ Input, MOD = 30% – 0.4 1.0 % With 107dBµ Input, MOD = 30% – 0.3 1.0 % Quiescent – 0 0.5 V 3.0 4.5 7.0 V Vin 19 25 31 dBµ VOSC 250 350 – mVrms Typ Unit 2.5 V THD VSM With 107dBµ Input Input at Signal Meter Output = 1V Local Oscillation–Buffer Output Reference Characteristics: Parameter Symbol Test Conditions Signal Meter Output VSM With 40dBµ Input Total Harmonic Distortion THD With 112dBµ Input, MOD = 30% 2 % 10 mVrms Local Oscillation Fluctuation within a Band DVOSC From VOSC(L) (522kHz) to VOSC(H) (1647kHz) Signal Meter Bandwidth (Note 1) VSM–BW With 80dBµ Input, 1/2 Output Frequency ±1.5 kHz With 80dBµ Input, 1/10 Output Frequency –4.5 +7.0 kHz Selectivity ±10kHz at 30% MOD 45 dB IF Interference fr = 600kHz 85 dB Image Frequency Interference Ratio fr = 1400kHz 40 dB Note 1. BFB450C4 (Murata, japan) was used as a narrow band filter (0dBm = 775mV, 0dBµ = 1µV). Pin Connection Diagram AGC 1 20 Buffer Output RF 2 RF Input 3 19 OSC Coil 18 OSC Coil D 4 RF GND 17 AGC Input RF Output 5 16 “S” Meter Mixer Input 6 15 “S” Meter Mixer Output 7 14 IF VCC RF VCC 8 IF Input 9 13 Detector Output 12 IF GND IFT 10 20 11 Detector Input 11 .339 (8.6) 1 10 1.063 (27.0) Max .400 (10.16) .200 (5.08) Max .100 (2.54) .100 (2.54) Min