Texas Instruments OPA1632DGNG4

Overview

OPA1632DGNG4 from Texas Instruments is a fully differential audio operational amplifier designed to convert single-ended inputs to balanced differential outputs with ultra-low distortion (0.000028% THD+N at 1 kHz, RL = 2 kΩ), low input voltage noise (1.25 nV/√Hz), and high slew rate (72 V/μs), enabling high-fidelity signal conditioning in professional audio ADC driver and Class-D predriver applications.

For engineers reviewing the OPA1632DGNG4 datasheet, OPA1632DGNG4 pinout, OPA1632DGNG4 application, or OPA1632DGNG4 equivalent, key selection criteria include differential output common-mode control (VOCM pin), ±2.5 V to ±15 V dual-supply operation, shutdown functionality with 2 μs enable/disable timing, thermal performance of HVSSOP-8 PowerPAD™ package (RθJB = 30.0°C/W), and verified compatibility with PCM1804 ADC interfaces.

Technical Context

The OPA1632DGNG4 implements a fully differential architecture with independent input and output stages, supporting both differential-input/differential-output and single-ended-input/differential-output configurations via external resistor networks. Its internal VOCM feedback loop enables precise control of output common-mode voltage independent of gain setting.

It features an active-high enable pin referenced to V−, with threshold voltages of (V−) + 1.45 V (enable) and (V−) + 1.4 V (disable), and integrates an internal 250-kΩ pull-up to V+ that ensures default-enable operation when the enable pin is unconnected.

Key Specifications

Pinout & Package

The OPA1632DGNG4 is housed in an 8-pin HVSSOP PowerPAD™ package (3 mm × 4.9 mm) with exposed thermal pad electrically isolated from the die but requiring connection to a PCB ground or power plane for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4561IRGET and LMH6554MA/NOPB, the OPA1632DGNG4 uniquely balances ultra-low audio-band distortion, VOCM-controlled common-mode flexibility, and integrated shutdown-making it the only option among the three qualified for professional audio ADC interface and Class-D predriver roles requiring both precision and power management.

Availability

OPA1632DGNG4 is available at Aetrix Electronics and suitable for professional audio mixer or control surface, professional microphone and wireless system, and professional speaker system applications requiring stable component supply and long-term production continuity.

Supply support for OPA1632DGNG4 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.

The OPA1632DGNG4 belongs to TI's OPA high-fidelity audio amplifier product line, engineered specifically for low-noise, low-distortion signal conditioning in professional audio data acquisition and digital audio conversion systems.

FAQ

What is the primary function of the VOCM pin on the OPA1632DGNG4?

The VOCM (Voltage Output Common-Mode) pin on the OPA1632DGNG4 sets the DC common-mode voltage of the differential output pair (VOUT+ and VOUT−). It enables precise alignment of the output midpoint to match the input requirements of downstream devices-such as the PCM1804 ADC-which demand a specific common-mode level (e.g., 2.5 V). This eliminates the need for external level-shifting circuitry and ensures optimal dynamic range utilization in the OPA1632DGNG4 signal chain.

Does the OPA1632DGNG4 require external pull-up or pull-down resistors on the Enable pin?

No, the OPA1632DGNG4 does not require external pull-up or pull-down resistors on the Enable pin. It integrates a 250-kΩ internal pull-up resistor to the V+ supply, ensuring the device powers up enabled by default when the Enable pin is left unconnected. This simplifies system design and avoids unintended shutdown during power sequencing, while still allowing active control via logic-level signals referenced to V−.

Can the OPA1632DGNG4 operate from a single 5-V supply?

Yes, the OPA1632DGNG4 supports single-supply operation from 5 V to 30 V, as specified in its Recommended Operating Conditions. However, its fully differential architecture and VOCM control are optimized for dual-supply use (±2.5 V to ±15 V) to maximize output swing and common-mode flexibility. When using a 5-V single supply, the VOCM pin must be biased appropriately (e.g., to 2.5 V) and output swing will be limited-confirming suitability for the target application requires verifying headroom and THD+N performance under those specific conditions in the OPA1632DGNG4 datasheet.

What thermal considerations apply to the HVSSOP-8 PowerPAD™ package of the OPA1632DGNG4?

The OPA1632DGNG4 in HVSSOP-8 PowerPAD™ package requires soldering the exposed thermal pad to a PCB ground or power plane to achieve its rated thermal performance. With RθJB = 30.0°C/W, effective heat dissipation depends on copper area, layer count, and via density beneath the pad. Failure to connect the pad risks junction temperature exceeding 150°C under typical 13–17.1 mA quiescent current, potentially triggering thermal shutdown or long-term reliability degradation in the OPA1632DGNG4.

How does the OPA1632DGNG4 compare to standard op-amps in driving ADC inputs?

The OPA1632DGNG4 differs fundamentally from standard op-amps by providing true differential output with VOCM control, enabling direct, low-noise, low-distortion interface to high-performance audio ADCs like the PCM1804. Standard op-amps lack balanced outputs and common-mode control, requiring additional components (e.g., transformers or second op-amp) to generate differential signals-introducing mismatch, noise, and distortion. The OPA1632DGNG4 achieves 0.000028% THD+N and 1.25 nV/√Hz noise in a monolithic solution, preserving signal integrity far beyond what discrete alternatives can deliver.