Texas Instruments OPA2837IDGKT

Overview

OPA2837IDGKT from Texas Instruments is a dual-channel, unity-gain stable, voltage-feedback operational amplifier optimized for precision SAR ADC driving and reference buffering. It delivers 105 MHz small-signal bandwidth at 1 V/V gain, 600 µA per channel quiescent current, ±130 µV max input offset voltage (25°C), rail-to-rail output swing, and negative-rail input capability - enabling high-fidelity signal conditioning in low-power 16-bit data acquisition systems such as portable medical sensors and battery-powered instrumentation.

For engineers reviewing the OPA2837IDGKT datasheet, OPA2837IDGKT pinout, OPA2837IDGKT application, or OPA2837IDGKT equivalent, key selection criteria include its 4.7 nV/√Hz input voltage noise at >100 Hz, 50 MHz gain-bandwidth product, fast 35 ns settling time to 0.1%, shutdown current of ≤5 µA, and operation across –40°C to +125°C with <±1.6 µV/°C input offset drift (DCK package).

Technical Context

The OPA2837IDGKT implements a voltage-feedback architecture with fully differential input stage and rail-to-rail output stage, supporting true ground-referenced single-supply operation from 2.7 V to 5.4 V. Its internal trimming achieves ±130 µV (max) input offset voltage and enables stable unity-gain performance without external compensation.

Each channel features independent power-down control (PD1/PD2 pins), delivering 5 µA shutdown current with 300 ns turn-on and 100 ns turn-off delays. Channel-to-channel crosstalk is –126 dBc at 10 kHz, confirming isolation suitable for dual-path signal chains in precision ADC front-ends.

Key Specifications

Pinout & Package

The OPA2837IDGKT is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm, with exposed thermal pad for enhanced thermal performance (R_θJA = 182°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision, low-power op amp applications.

Compared with OPA2836IDGKT and ADA4807-2ARMZ, the OPA2837IDGKT uniquely balances 105-MHz bandwidth, 600-µA/ch quiescent current, per-channel shutdown, and ±130-µV offset - making it optimal for energy-constrained, high-resolution SAR ADC driver applications requiring dynamic power management.

Availability

OPA2837IDGKT is available at Aetrix Electronics and suitable for portable medical devices, industrial data acquisition systems, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for OPA2837IDGKT 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 leader specializing in analog and embedded processing technologies, with decades of innovation in precision amplifiers and data converter interface solutions.

The OPAx837 family was designed specifically for low-power, high-accuracy SAR ADC driver and reference buffer applications - targeting 12- to 16-bit resolution systems operating from single 3.3-V or 5-V supplies.

FAQ

What is the maximum operating temperature range for the OPA2837IDGKT?

The OPA2837IDGKT is characterized for continuous operation from –40°C to +125°C ambient temperature, with guaranteed performance across this full industrial and extended automotive range. Electrical specifications including input offset drift (<±1.6 µV/°C for DGK package), CMRR (≥90 dB), and output drive capability remain valid throughout this range, making OPA2837IDGKT suitable for harsh-environment applications such as motor control and outdoor instrumentation.

Does the OPA2837IDGKT support true single-supply operation with input signals down to ground?

Yes, the OPA2837IDGKT supports true single-supply operation with input common-mode voltage extending to VS– (0 V). Its negative-rail input stage allows DC-coupled signal acquisition from ground-referenced sources - critical for low-side current sensing and sensor interfaces where signals swing from 0 V. This capability eliminates level-shifting circuitry and simplifies design when using OPA2837IDGKT with 3.3-V or 5-V microcontrollers and ADCs.

How does the power-down feature of the OPA2837IDGKT work, and what is its recovery time?

The OPA2837IDGKT features independent PD1 and PD2 pins that place each amplifier into ultra-low-power shutdown mode when driven below 0.55 V (VS– + 0.55 V). In shutdown, quiescent current drops to ≤5 µA per channel. Recovery is fast: turn-on delay is 300 ns to reach 90% of final output value, and turn-off delay is 100 ns. This behavior makes OPA2837IDGKT ideal for power-gated ADC front-ends where OPA2837IDGKT activates only during sampling windows.

Can the OPA2837IDGKT drive high-capacitive loads typical of SAR ADC inputs without instability?

Yes, the OPA2837IDGKT is unity-gain stable and designed to drive capacitive loads up to 100 pF directly, as verified in TI's application notes for SAR ADC drivers. Its 50-MHz gain-bandwidth product and low 0.14-Ω output impedance at 1 MHz ensure robust transient response into typical ADC input capacitances (e.g., 20–50 pF). For loads exceeding 100 pF, a small series resistor (e.g., 5–10 Ω) at the output is recommended - a standard practice confirmed in OPA2837IDGKT evaluation reports.

What is the input voltage noise density of the OPA2837IDGKT, and how does it impact 16-bit ADC performance?

The OPA2837IDGKT has an input voltage noise density of 4.7 nV/√Hz above 100 Hz and a low 1/f noise corner at 35 Hz. When driving a 16-bit SAR ADC like the ADS8860 with 100-kHz effective noise bandwidth, total integrated noise is ~15 µV_RMS, contributing <0.25 LSB of noise to a 4.096-V full-scale range. This ensures OPA2837IDGKT does not limit system ENOB - a key reason it is specified in TI reference designs such as TIDA-01565 for high-accuracy data acquisition.