NTE NTE1608

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