Texas Instruments OPA1632DG4

Overview

OPA1632DG4 from Texas Instruments is a fully differential audio operational amplifier designed to convert single-ended inputs to balanced differential outputs for high-fidelity signal chains. It delivers 180 MHz gain bandwidth, 72 V/μs slew rate, and ultra-low 1.25 nV/√Hz input voltage noise, enabling low-distortion predriver stages in professional audio ADC interfaces like the PCM1804.

For engineers reviewing the OPA1632DG4 datasheet, OPA1632DG4 pinout, OPA1632DG4 application, or OPA1632DG4 equivalent, key selection criteria include THD+N (0.000028% at 1 kHz, RL = 2 kΩ), shutdown current (0.85 mA at ±5 V), supply range (±2.5 V to ±15 V), VOCM control flexibility, and SOIC-8 thermal performance (RθJA = 126.3°C/W).

Technical Context

The OPA1632DG4 implements a fully differential architecture with independent input and output common-mode control via VOCM (Pin 2), supporting both differential-input/differential-output and single-ended-input/differential-output configurations. Its internal feedback network enables precise gain setting with external resistors while maintaining DC-coupled output common-mode alignment.

It features active-high enable logic referenced to V−, with turn-on/off delay of 2 μs and internal 250-kΩ pull-up to V+, allowing operation without external biasing. The amplifier maintains stable performance across −40°C to +85°C ambient and supports rail-to-rail output swing headroom up to 20 VPP into 2 kΩ load at THD < 0.01%.

Key Specifications

Pinout & Package

OPA1632DG4 is housed in an SOIC-8 (D) package measuring 4.9 mm × 6 mm, with standard lead pitch and gull-wing leads suitable for automated assembly and reflow. Thermal performance is characterized at RθJA = 126.3°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fully differential amplifier applications.

Compared with OPA1632D, OPA1632DG4 offers identical performance with RoHS-compliant finish; versus THS4561IDGKR, OPA1632DG4 provides 60 MHz more bandwidth and 9 mA lower IQ, making it preferable for high-fidelity ADC interface and power-constrained professional audio systems.

Availability

OPA1632DG4 is available at Aetrix Electronics and suitable for professional audio mixer design, studio microphone preamplification, and high-resolution data acquisition systems requiring stable component supply across extended production lifecycles.

Supply support for OPA1632DG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision amplifiers and high-performance signal chain solutions.

The OPA1632 product line targets professional audio infrastructure, delivering ultra-low-noise, low-distortion fully differential amplifiers optimized for ADC driving and high-fidelity analog signal conditioning.

FAQ

What is the maximum supply voltage rating for the OPA1632DG4?

The OPA1632DG4 has an absolute maximum supply voltage of ±16.5 V. Operation beyond this limit risks permanent damage. For reliable long-term use, the recommended dual-supply range is ±2.5 V to ±15 V, which ensures full specification compliance across temperature and load conditions while preserving device lifetime and parametric stability.

How does the VOCM pin function in the OPA1632DG4?

The VOCM pin (Pin 2) in the OPA1632DG4 sets the DC common-mode voltage of the differential output pair (VOUT+ and VOUT−). Applying a stable voltage-such as 2.5 V for interfacing with the PCM1804 ADC-centers the output swing precisely, eliminating the need for AC-coupling capacitors and associated low-frequency phase shift or distortion. This direct level control simplifies system design and improves low-frequency fidelity.

Can the OPA1632DG4 operate with a single supply?

Yes, the OPA1632DG4 supports single-supply operation from 5 V to 30 V, per its Recommended Operating Conditions. In single-supply mode, the negative supply pin (V−) must be connected to ground, and VOCM must be biased to half the supply voltage (e.g., 2.5 V for 5 V) to maintain symmetric output swing. Input common-mode range extends from (V−) + 1.5 V to (V+) − 1 V, enabling robust rail-to-rail input capability.

What is the thermal resistance (RθJA) of the OPA1632DG4 in its SOIC-8 package?

The OPA1632DG4 in the SOIC-8 (D) package has a junction-to-ambient thermal resistance (RθJA) of 126.3°C/W under standard JEDEC test conditions (2S2P board). This value assumes no copper pour or thermal vias; adding a 1-in² copper pad connected to V− or GND can reduce effective RθJA by ~25–30°C/W, improving power handling and reliability in continuous high-output applications.

Does the OPA1632DG4 require external components for stable operation?

Yes, the OPA1632DG4 requires external gain-setting resistors (RF and RG) and bypass capacitors (typically 0.1 µF ceramic + 10 µF tantalum per supply rail) for stable operation. The VOCM pin also needs a clean, low-impedance voltage source. No compensation capacitor is needed due to internal unity-gain stability, but proper PCB layout-short traces, ground plane, and separation from noisy digital sections-is essential to achieve specified THD+N and noise performance.