Texas Instruments OPA862IDTKR

Overview

OPA862IDTKR from Texas Instruments is a high-input-impedance, single-ended-to-differential ADC driver optimized for 16-bit and 18-bit data acquisition systems. It delivers 44 MHz small-signal bandwidth at G = 2 V/V, 140 V/µs slew rate, 8.3 nV/√Hz output-referred noise, ±700 µV max differential output offset, and rail-to-rail output swing with 60 mA linear output current - enabling direct sensor interfacing in precision test equipment and medical instrumentation.

For engineers reviewing the OPA862IDTKR datasheet, OPA862IDTKR pinout, OPA862IDTKR application, or OPA862IDTKR equivalent, key selection criteria include input impedance (325 MΩ), harmonic distortion (–122 dBc HD2 at 50 kHz), disable-mode quiescent current (12 µA), extended temperature range (–40°C to +125°C), and WSON-8 package thermal performance (R_θJB = 34.4°C/W).

Technical Context

The OPA862IDTKR integrates two amplifiers: A1 (high-Z signal path) and A2 (reference path), with independent bias current cancellation (A2 IB = ±5 nA typical). Its dual-amplifier architecture enables precise common-mode control via the VREF pin while maintaining >100 dB CMRR and >105 dB PSRR over frequency.

It operates across 3 V to 12.6 V supply range (single- or dual-supply), supports gain configuration via external resistors, and features fast enable/disable timing (1.3 µs turn-on, 2.5 µs turn-off) with defined logic thresholds on PD pin (enable < V_S– + 1 V, disable > V_S– + 1.5 V).

Key Specifications

Pinout & Package

OPA862IDTKR uses an 8-pin WSON package (3.00 mm × 3.00 mm, 0.65 mm pitch) with exposed thermal pad soldered to PCB ground or power plane for optimal thermal dissipation (R_θJB = 34.4°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ADC driver applications.

Compared with THS4561IRGET and LMH5401RTVT, the OPA862IDTKR uniquely balances ultra-high input impedance, integrated VREF control, low-power disable mode, and WSON-8 thermal efficiency - making it optimal for portable, precision, and thermally constrained 16–18-bit DAQ systems.

Availability

OPA862IDTKR is available at Aetrix Electronics and suitable for 16-bit and 18-bit ADC drivers, piezoelectric sensor interfaces, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA862IDTKR 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, embedded processing, and connectivity technologies with over 90 years of innovation in precision signal chain solutions.

The OPA862 belongs to TI's high-speed precision op amp product line, engineered specifically for demanding ADC driver, sensor interface, and test-and-measurement applications where input impedance, distortion, and thermal stability are critical.

FAQ

What is the maximum supply voltage for OPA862IDTKR?

The OPA862IDTKR supports a maximum total supply voltage of 13 V (VS+ – VS–), with recommended operating range from 3 V to 12.6 V. Exceeding 13 V risks permanent damage per absolute maximum ratings. Operation at 12.6 V is validated across –40°C to +125°C and maintains full specification compliance including 44 MHz bandwidth and –122 dBc HD2 performance.

Does OPA862IDTKR require external resistors for gain configuration?

Yes, the OPA862IDTKR requires external resistors to set differential gain. The default configuration (RF = 0 Ω, RG = open) yields G = 2 V/V. To achieve other gains (e.g., G = 4 V/V), specific resistor networks must be connected between VOUT+, VFB, and ground per Figure 8-2 in the datasheet. No internal gain-setting resistors are present.

How does the VREF pin function in OPA862IDTKR?

The VREF pin on the OPA862IDTKR sets the output common-mode voltage independently of the signal path. When driven with a stable voltage (e.g., 2.5 V), it forces the average of VOUT+ and VOUT– to match that value - essential for matching ADC input common-mode requirements. It exhibits 2.3 GΩ || 3.5 pF input impedance and supports rail-to-rail common-mode range.

What is the thermal performance of the OPA862IDTKR in its WSON-8 package?

The OPA862IDTKR in the DTK (WSON-8) package achieves R_θJB = 34.4°C/W (junction-to-board) when the exposed thermal pad is soldered to a solid copper plane. This is significantly better than the SOIC-8 variant (69.1°C/W), enabling higher continuous output current (60 mA) and reliable operation at +125°C ambient in compact PCB layouts.

Can OPA862IDTKR drive a 2-kΩ differential load at full 10-VPP swing?

Yes, the OPA862IDTKR is fully specified to drive a 2-kΩ differential load with 10-VPP output swing (±5 V) while maintaining –122 dBc HD2 and –140 dBc HD3 at 50 kHz. This capability is validated across temperature and supply voltage (3 V to 12.6 V) and forms the basis for its use in high-fidelity 18-bit DAQ systems such as memory testers and precision oscilloscopes.