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NE5534AP

Single low-noise audio op-amp, 3.5nV, 10MHz GBW, 13V/us, 8-PDIP

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Manufacturer Part：

NE5534AP

Package：

8-PDIP

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Description

Product Overview

The NE5534AP from Texas Instruments is a high-performance single low-noise operational amplifier. With 3.5nV/root-Hz input noise, 10MHz GBW, and 13V/us slew rate, it is the standard single-channel audio op-amp for professional mixing consoles and recording equipment. Packaged in 8-PDIP.

Key Specifications

GBW 10MHz
Slew Rate 13V/us
Input Noise Voltage 3.5nV/root-Hz (typ at 1kHz)
Supply Voltage +/-3V to +/-20V
Input Offset Voltage 0.5mV (typ)
CMRR 100dB (typ)
Output Current +/-38mA (short circuit)
Package 8-PDIP
Operating Temperature 0 to +70 C

Features

  • Ultra-low noise: 3.5nV/root-Hz
  • 10MHz gain-bandwidth product
  • 13V/us slew rate for audio applications
  • Compensation pin for driving capacitive loads
  • Offset null adjustment
  • Industry-standard audio op-amp since 1979

Applications

  • Professional audio mixing consoles
  • Microphone preamplifiers
  • RIAA phono equalization
  • Active filter and equalizer circuits

The NE5534AP from Texas Instruments is a single-channel low-noise operational amplifier designed for professional audio applications. First introduced by Signetics in 1979, it set the standard for audio op-amp performance with 3.5nV/root-Hz input noise density, 10MHz gain-bandwidth, and 13V/us slew rate. The low noise makes it ideal for microphone preamplifiers and phono stages where signal levels are very low. The 10MHz GBW ensures flat frequency response well beyond the audio band. Unlike the dual NE5532, the single NE5534A provides an offset null adjustment (pins 1 and 8) and a compensation capacitor pin (pin 5) for stability with capacitive loads. Without an external capacitor, the NE5534A is stable for closed-loop gains of 3 or higher; for unity-gain stability, a 22pF capacitor from pin 5 to pin 8 is required.

The NE5534AP uses a bipolar input stage for low noise and high slew rate. The input stage is a differential pair with active load, followed by a voltage gain stage and a Class-AB output stage. The bipolar input transistors provide lower noise than JFET or CMOS inputs at low source impedances (= 3. For unity-gain operation, an external 22pF capacitor from pin 5 to pin 8 adds a second pole that ensures stability. The offset null pins (1 and 8) allow trimming the input offset voltage to zero using a 10kOhm potentiometer. The 13V/us slew rate is achieved by the Class-AB input stage tail current that can charge and discharge the compensation capacitor rapidly.

Pin Name Function
1 OFFSET N1 Offset null adjustment (wiper of trim pot)
2 IN- Inverting input
3 IN+ Non-inverting input
4 VCC- Negative supply
5 COMP Compensation (22pF to pin 8 for unity gain)
6 OUTPUT Amplifier output
7 VCC+ Positive supply
8 OFFSET N2 Offset null adjustment / compensation return
  • Microphone preamplifier with 3.5nV noise and 10MHz bandwidth for studio recording
  • RIAA phono equalization with offset null for lowest DC offset
  • Active filter and equalizer with 13V/us slew rate for audio-band signals
  • Professional mixing console input stage with 100dB CMRR
Model Manufacturer Key Difference
NE5532P TI Dual version, 2 channels, unity-gain stable
OPA2134PA TI Dual JFET input, lower noise at high Z, higher cost
LM4562NA TI Dual, 2.7nV, modern ultra-low noise audio op-amp
TL072CP TI Dual JFET, 18nV noise, lower cost, higher noise
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