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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 = +25C 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 +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +125C Recommended Operating Condition: (TA = +25C unless otherwise specified) Recommended Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Electrical Characteristics: (TA = +25C, VCC = 12V, fr = 1MHz, fm = 400Hz unless otherwise specified)
Parameter Current Dissipation Symbol ICC vo S/N Test Conditions Quiescent With 107dB Input Detector Output With 23dB Input, MOD = 30% With 80dB Input, MOD = 30% Signal-to-Noise Ratio With 23dB Input, MOD = 30% With 80dB Input, MOD = 30% Total Harmonic Distortion THD With 80dB Input, MOD = 30% With 107dB Input, MOD = 30% Signal Meter Output VSM Vin VOSC Quiescent With 107dB Input Input at Signal Meter Output = 1V Local Oscillation-Buffer Output Min 16 19 Typ 25 29 Max 35 40 Unit mA mA dBm dBm dB dB % % V V dB mVrms
-27.5 -23.0 -18.5 -15.5 -12.5 16 52 - - - 3.0 19 250 20 57 0.4 0.3 0 4.5 25 350 -9.5 - - 1.0 1.0 0.5 7.0 31 -
Reference Characteristics:
Parameter Signal Meter Output Total Harmonic Distortion Local Oscillation Fluctuation within a Band Signal Meter Bandwidth (Note 1) Symbol VSM THD DVOSC VSM-BW Test Conditions With 40dB Input With 112dB Input, MOD = 30% From VOSC(L) (522kHz) to VOSC(H) (1647kHz) With 80dB Input, 1/2 Output Frequency With 80dB Input, 1/10 Output Frequency Selectivity IF Interference Image Frequency Interference Ratio 10kHz at 30% MOD fr = 600kHz fr = 1400kHz Typ 2.5 2 10 1.5 -4.5 +7.0 45 85 40 Unit V % mVrms kHz kHz dB dB dB
Note 1. BFB450C4 (Murata, japan) was used as a narrow band filter (0dBm = 775mV, 0dB = 1V).
Pin Connection Diagram
AGC 1 RF 2 RF Input 3 D RF GND 4 RF Output 5 Mixer Input 6 Mixer Output 7 RF VCC 8 IF Input 9 IFT 10
20 Buffer Output 19 OSC Coil 18 OSC Coil 17 AGC Input 16 "S" Meter 15 "S" Meter 14 IF VCC 13 Detector Output 12 IF GND 11 Detector Input
20
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

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