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Nte 7157

The NTE7157 is an integrated circuit with two audio power amplifier channels. It is designed for use in portable cassette players to provide up to 2.5W of power per channel. It has features such as voltage gain of 45dB, low quiescent current draw, thermal shutdown protection, and soft clipping to prevent distortion. The document provides specifications for electrical characteristics like output power, gain, noise, and operating temperature range.

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75 views2 pages

Nte 7157

The NTE7157 is an integrated circuit with two audio power amplifier channels. It is designed for use in portable cassette players to provide up to 2.5W of power per channel. It has features such as voltage gain of 45dB, low quiescent current draw, thermal shutdown protection, and soft clipping to prevent distortion. The document provides specifications for electrical characteristics like output power, gain, noise, and operating temperature range.

Uploaded by

CRAFT
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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NTE7157

Integrated Circuit
Low Frequency Power Amplifier

Description:
The NTE7157 is an audio power integrated circuit in a 12 - Lead DIP type package with built - in two
channels designed for use in a portable radio cassette tape recorder with power ON/OFF switch.

Features:
D High Power:
POUT = 2.5W/Ch Typ (VCC = 9V, RL = 4Ω, f = 1kHz, THD = 10%)
POUT = 3.0W/Ch Typ (VCC = 9V, RL = 3Ω, f = 1kHz, THD = 10%)
D Voltage Gain:
GV = 45.0dB Typ (Rf = 120Ω, f = 1kHz)
GV = 56.5dB Typ (Rf = 0Ω, f = 1kHz)
D Small Quiescent Current: ICCQ = 21mA Typ (VCC = 9V, VIN = 0)
D Ripple Rejection Ratio: RR = - 52dB Typ (VCC = 9V, fripple = 100Hz, Rg = 600Ω)
D Crosstalk: CT = - 50dB Typ (VCC = 9V, f = 1kHz, Rg = 600Ω)
D Output Noise Voltage: Vno = 0.3mVrms Typ (VCC = 9V, Rg = 10kΩ, BW = 20Hz to 20kHz)
D Stand - By Switch
D Soft Clip
D Built - In Thermal Shut Down Protection Circuit
D Operating Supply Voltage Range: VCC(opr) = 5V to 12V (TA = +25°C)
D Low Popping Noise at Power ON

Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)


DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Output Current (Peak/Ch), IO(peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5A
Power Dissipation (Note 1), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0W
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 25° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 55° to +150°C
Note 1. Value for mounting on PC board.
Electrical Characteristics: (VCC = 9V, RL = 4Ω, Rg = 600Ω, f = 1kHz, TA = +25°C unless otherwise
specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Quiescent Current ICCQ Vin = 0 - 21 45 mA
Output Power Pout THD = 10% 2.0 2.5 - W
THD = 10%, RL = 3Ω - 3.0 - W
Total Harmonic Distortion THD Pout = 0.4W/Ch - 0.2 1.0 %
Voltage Gain GV Rf = 120Ω, Vout = 0.775Vrms (0dBm) 43 45 47 dB
Rf = 0Ω, Vout = 0.775Vrms (0dBm) - 56.5 - dB
Input Resistance RIN - 30 - kΩ
Output Noise Voltage Vno Rg = 10kΩ, BW = 20Hz to 20kHz - 0.3 1.0 mVrms
Ripple Rejection Ratio RR Rg = 600Ω, fripple = 100Hz - -52 - dB
Crosstalk CT Rg = 600Ω, Vout = 0.775Vrms (0dBm) - -50 - dB
Input Offset Voltage V6, V7 - 30 60 mV
Stand - By Current Istb SW1 → OFF - 1 - µA

Pin Connection Diagram

VCC2 1 12 VCC1
Output 1 2 11 Output 2
Bootstrap 1 3 10 Bootstrap 2
Tab

Tab

PW - GND PW - GND

Pre - GND 4 9 Ripple


NF 1 5 8 NF 2
Input 1 6 7 Input 2

.202 (5.12)

12 10 9 7

1 3 4 6

.770 (19.5) .254 (6.45)


Max

.168 (4.26) Max

.138
.100 (2.54) .141 (3.5)
(3.6)

.700 (17.78) .300 (7.62)

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