Texas Instruments PGA202KP

Overview

PGA202KP from Texas Instruments (originally Burr-Brown) is a monolithic, digitally programmable instrumentation amplifier with fixed decade gains of 1, 10, 100, and 1000. It features FET inputs (50 pA max bias current), 0.012% max nonlinearity, 2 µs settling to 0.01%, and operates over –25°C to +85°C in a 14-pin plastic DIP package. It is used in precision data acquisition front-ends where auto-ranging and dynamic range expansion are required.

For engineers reviewing the PGA202KP datasheet, PGA202KP pinout, PGA202KP application, or PGA202KP equivalent, key selection considerations include gain accuracy vs. temperature (≤150 ppm/°C at G=1000), CMRR ≥94 dB at G=1000, input offset voltage of ±(2 + 24/G) mV, and compatibility with TTL/CMOS digital control lines A0/A1 for microprocessor interfacing.

Technical Context

The PGA202KP uses a differential transconductance front end with four laser-trimmed input stages, each configured with a unique gain-setting resistor. Gain switching is achieved via current-steering logic, enabling fast settling independent of gain change-critical for multiplexed sensor systems.

Its output stage is a differential transimpedance amplifier with laser-trimmed resistors to minimize output offset and drift. Unlike classical three-op-amp instrumentation amplifiers, its common-mode input range (±13 V) remains stable across all gains and is unaffected by output swing or load conditions.

Key Specifications

Pinout & Package

PGA202KP is housed in a 14-pin plastic dual in-line package (PDIP-N), compliant with JEDEC MS-001, with 2.54 mm pitch and through-hole mounting. Pin 14 is Digital Common, providing isolated reference for TTL/CMOS-compatible A0/A1 inputs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable-gain instrumentation amplifier applications.

Compared with INA128P and PGA205AU, the PGA202KP uniquely combines decade gain steps, TTL/CMOS digital control with isolated Digital Common, and plastic DIP packaging - making it optimal for cost-sensitive, microprocessor-driven DAQ systems operating in commercial/industrial ambient conditions.

Availability

PGA202KP is available at Aetrix Electronics and suitable for data acquisition systems, auto-ranging circuits, and remote instrumentation requiring stable component supply with long-term manufacturability and legacy support.

Supply support for PGA202KP 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 acquired Burr-Brown in 2000 and maintains full technical and manufacturing support for legacy precision analog products including the PGA202KP.

The PGA202KP belongs to TI's legacy programmable-gain instrumentation amplifier product line, designed specifically for high-accuracy, microprocessor-controlled signal conditioning in test equipment and industrial data acquisition.

FAQ

What gain options does the PGA202KP support, and how are they selected?

The PGA202KP supports discrete decade gains of 1, 10, 100, and 1000. These are selected using two TTL/CMOS-compatible digital inputs - A0 and A1 - referenced to the dedicated Digital Common (Pin 14). The combination of A1/A0 logic states directly maps to gain per the internal laser-trimmed decoder, requiring no external configuration circuitry. This makes the PGA202KP ideal for embedded systems where microcontroller GPIO pins drive gain changes dynamically during operation.

Does the PGA202KP require external components for basic operation?

No, the PGA202KP is fully functional with no external components required for core operation. Laser trimming of gain, offset, and CMRR eliminates the need for external calibration resistors or nulling networks. Only decoupling capacitors (1 µF tantalum per supply rail, placed near Pins 8 and 13) are recommended for optimal noise and stability performance. Optional components - such as external filter capacitors on Pins 5 and 10 or offset trim pots on Pins 6 and 9 - enhance specific design goals but are not mandatory for baseline functionality of the PGA202KP.

What is the operating temperature range specified for the PGA202KP?

The PGA202KP is specified for operation from –25°C to +85°C, matching the commercial-industrial hybrid range typical of plastic DIP-packaged precision amplifiers. This range is validated across all electrical parameters including gain error (≤0.5% max at G=1000), input offset (±(2 + 24/G) mV), and CMRR (≥94 dB at G=1000). The device can survive storage from –40°C to +100°C and operate transiently up to +125°C, but full parameter compliance is guaranteed only within the –25°C to +85°C specification envelope for the PGA202KP.

How does the PGA202KP handle common-mode voltage rejection across different gains?

The PGA202KP maintains high common-mode rejection ratio (CMRR) across its full gain range due to its transconductance-based front end and laser-trimmed output resistors. CMRR is specified at ≥80 dB for G=1, ≥86 dB for G=10, ≥92 dB for G=100, and ≥94 dB for G=1000 - all measured at +25°C. Unlike classical three-op-amp architectures, its CMRR does not degrade with increasing gain because common-mode rejection is not dependent on external resistor matching. This behavior is intrinsic to the PGA202KP's patented circuit topology and is confirmed in the datasheet's typical performance curves.

Can the PGA202KP be used with single-supply operation?

The PGA202KP is designed for dual-supply operation (±6 V to ±18 V) and does not support true single-supply operation. Its input common-mode range extends to ±13 V with ±15 V supplies, and its output swing is centered around ground - requiring both positive and negative rails for full functionality. While it may power up with asymmetric supplies (e.g., +15 V / –5 V), output headroom, CMRR, and distortion performance will deviate significantly from datasheet specifications. For single-supply applications, designers should consider modern alternatives such as the TI PGA309 or ADI AD8253, not the PGA202KP.