1518

NTE1518
Integrated Circuit
AM RF/IF Detector, AGC
Description:
The NTE1518 is an integrated circuit for AM tuners. It is suitable for use in automotive radio receivers,
where compact mounting is required. Internally, RF amplifier, mixer, IF amplifier, detector and two
types of AGC circuit are included.
Features:
D Reduction of adjustment time and mounting area for IF transformer
D Balanced at all frequencies
D Good S/N and Tweet Characteristic
D Protection Against Electrostatic Damage at the Antenna Terminal
D No Clicks When Power Switch is Turned On
D Wide AGC Range is Provided by two AGC Circuits Employed in the IF and RF Stages
D Can Withstand Large Input and High S/N
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Input Voltage, Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Vp−p
Power Dissipation (TA = 75°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430mW
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40° to +125°C
Electrical Characteristics: (TA = +25°C, VCC = 13V, f = 1MHz, fmod = 400Hz, MOD = 20%, RL = 10kΩ)
Test Conditions
Rating
Unit
Max. Sensitivity
Input Voltage at which Det Output Voltage = 40mVrms
13
dBµV
Useable Sensitivity
Input Voltage ar which S/N is 20dB
23
dBµV
Detector Output
ni = 74dBµV
110
mVrms
Detector Distortion
0.4
%
Signal−to−Noise Ratio
54
dB
Parameter
Overload Distortion
ni = 126dBµV
0.4
%
IF Rejection
f = 1MHz, no = 40mVrms, IF−450kHz
72
dB
Image Rejection
f = 1MHz, no = 40mVrms, f + 2IF
74
dB
Selectivity
f = 1MHz, ∆f = ±10kHz
45
dB
Tweet
ni = 74dBµV
2IF = 900kHz
45
dB
3IF = 1350kHz
50
dB
Pin Connection Diagram
19 VCC
18 AGC Detector Input
17 Bypass
16 Bypass
15 Detector Output
14 Detector Input
13 Bypass
12 IF Output
11 IF Input
10 GND
9 GND
8 Local OSC
7 Mixer Output
6 Mixer Input
5 Bypass
4 RF Output
3 Bypass
2 Bypass
1 RF Input
1.100 (27.9) Max
.110 (2.79)
.402
(10.2)
.335
(8.5)
.543
(13.8)
.100 (2.54)
.900(22.8)
0.39
(1.0)
.100 (2.54)
0.39
(1.0)