NTE NTE1557 Datasheet

NTE1557
Integrated Circuit
FM/AM IF System

Description:

The NTE1557 is a monolithic integrated circuit in a 16–Lead DIP type package developed for the radio
cassette tape recorder included AM/FM IF amplifier and detector.

Functions:

D AM Section:

IF Amplifier with AGC Detector

D Voltage Regulator for RF External Circuit
D FM Section:

IF Amplifier
Quadrature Detector
Post Amplifier
Signal Meter Driver Circuit

Features:

D Suitable for Radio Cassette and Home Stereo
D Wide Operating Supply Voltage Range (3.0V to 14V)
D Low Quiescent Circuit Current
D AM Section
D Simplified Input Circuit IFT (Ceramic Filter Type)

RF AGC Available

D FM Section:

High Limiting Sensitivity (33dBµ, Typ)
Low Residual Noise (45dB at Vi = –10dBµ)
Small Side Peak of Detuned Output Voltage

Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, V

Power Dissipation, P
Operating Temperature Range, T
Storage Temperature Range, T

CC

D

opr

stg

16V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

600mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–20° to +70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40° to +125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Characteristics: (TA = +25°C, VCC = 5.5V, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

FM Section (f = 10.7MHz, fm = 1kHz, ∆f = ±75kHz)

Quiescent Circuit Current I
Input Limiting Sensitivity V
Detector Output Voltage V
Total Harmonic Distortion THD Vi = 100dBµ – 0.3 1.0 %
AM Rejection Ratio AMR Vi = 100dBµ 50 60 – dB
Signal to Noise Ratio S/N Vi = 100dBµ 72 83 – dB
Signal Meter Output V
Residual Noise V
Muting Attenuation M(att) VI = 37dBµ, Mute SW on – 35 – dB
AM Section (f = 455kHz, fm = 1kHz, 30% Mod)
Quiescent Circuit Current I
Maximum Sensitivity Vi(sen) VO (AF) = 10mV – 29 – dBµ
Detector Output Voltage V
Total Harmonic Distortion THD

Signal to Noise Ratio S/N Vi = 74dBµ 45 55 – dBµ

CC

i(lim)

CC

Vi = 0 7 11 16.5 mA
VO (Vi = 100dBµ) –3dB – 33 38 dBµ
VI = 100dBµ 180 245 310 mV

O

Vi = 100dBµ 1.05 1.5 2.05 V

M

VO (AF) (Vi = 100dBµ) – 45 – dB

N

Vi = 0 – 8 – mA

Vi = 74dBµ 45 65 85 mV

o

Vi = 74dBµ – 0.3 2.0 %
Vi = 100dB – 0.7 3.5 %

Signal Meter Output V
Input Impedance (Pin 16) R

Pin Connection Diagram

1st IF Amp Input (FM)

1st IF Decouple (FM)

VCC (FM)

1st IF Amp Output (FM)

2nd IF Amp Input (FM)

VI = 100dBµ 1.2 1.4 1.6 V

M

Pin 16 0.8–0.9V

i

1
2

3
4

5GND
6

7Voltage Regulator

DC

1st IF Amp Input (AM)

16
15

AGC Decouple
2nd IF Amp Input (AM)

14
13

GND

12 Detector Output
11

V

CC

10 Center Meter

1.45 2.12 2.8 kΩ

8Phase Shifter (FM) 9 FM Output