Overview
The OPA1637DGKT from Texas Instruments is a high-fidelity, low-noise, fully-differential operational amplifier designed for audio circuits. It features Texas Instruments' super-beta bipolar input devices, which provide exceptional low noise and low total harmonic distortion (THD). This amplifier is optimized for low power consumption while maintaining an excellent signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR). The OPA1637 is capable of operating over a wide temperature range of –40°C to +125°C and is available in an 8-pin VSSOP package.
Key Specifications
| Parameter | Typical Value | Unit |
|---|---|---|
| Input Voltage Noise | 3.7 nV/√Hz at 1 kHz | nV/√Hz |
| Total Harmonic Distortion + Noise (THD + N) | –120 dB at 1 kHz | dB |
| Supply Current | 950 µA at ±18 V | µA |
| Input Offset Voltage | ±200 µV (maximum) | µV |
| Input Bias Current | 2 nA (maximum) | nA |
| Bias Current Noise | 400 fA/√Hz at 10 Hz | fA/√Hz |
| Gain-Bandwidth Product | 9.2 MHz | MHz |
| Differential Output Slew Rate | 15 V/µs | V/µs |
| Supply Voltage Range | 3 V to 36 V | V |
| Power-Down Current | < 20 µA | µA |
| Operating Temperature Range | –40°C to +125°C | °C |
| Package | 8-pin VSSOP |
Key Features
- Low input voltage noise: 3.7 nV/√Hz at 1 kHz
- Low THD + N: –120 dB at 1 kHz
- Low supply current: 950 µA at ±18 V
- Wide input and output common-mode range
- Wide single-supply operating range: 3 V to 36 V
- Low supply current power-down feature: < 20 µA
- Overload power limit and current limit
- High-voltage supply capability up to ±18 V
- Very-low voltage and current noise
- Characterized for operation over a wide temperature range: –40°C to +125°C
Applications
- Professional audio mixers or control surfaces
- Professional microphones and wireless systems
- Professional speaker systems
- Professional audio amplifiers
- Soundbars
- Turntables
- Professional video cameras
- Guitar and other instrument amplifiers
- Data acquisition (DAQ) systems
Q & A
- What is the input voltage noise of the OPA1637?
The input voltage noise of the OPA1637 is 3.7 nV/√Hz at 1 kHz.
- What is the typical supply current of the OPA1637?
The typical supply current of the OPA1637 is 950 µA at ±18 V.
- What is the maximum input offset voltage of the OPA1637?
The maximum input offset voltage of the OPA1637 is ±200 µV.
- What is the gain-bandwidth product of the OPA1637?
The gain-bandwidth product of the OPA1637 is 9.2 MHz.
- What is the differential output slew rate of the OPA1637?
The differential output slew rate of the OPA1637 is 15 V/µs.
- What is the operating temperature range of the OPA1637?
The operating temperature range of the OPA1637 is –40°C to +125°C.
- What package is the OPA1637 available in?
The OPA1637 is available in an 8-pin VSSOP package.
- What are some common applications of the OPA1637?
The OPA1637 is commonly used in professional audio mixers, microphones, speaker systems, soundbars, turntables, professional video cameras, guitar amplifiers, and data acquisition systems.
- Does the OPA1637 have a power-down feature?
Yes, the OPA1637 has a power-down feature that reduces the quiescent current to less than 20 µA.
- What is the maximum supply voltage for the OPA1637?
The maximum supply voltage for the OPA1637 is 36 V.
