Texas Instruments PGA204AU/1KG4

Overview

PGA204AU/1KG4 from Texas Instruments (formerly Burr-Brown) is a digitally programmable-gain instrumentation amplifier with gain settings of 1, 10, 100, and 1000 V/V, ±50 µV max input offset voltage, 0.25 µV/°C drift, and 16-pin SOIC (DW) surface-mount package rated for –40°C to +85°C operation. It delivers high common-mode rejection (115 dB at G=1000), operates from ±4.5V to ±18V supplies, and is used in precision data acquisition systems requiring stable, low-drift analog signal conditioning.

For engineers reviewing the PGA204AU/1KG4 datasheet, PGA204AU/1KG4 pinout, PGA204AU/1KG4 application, or PGA204AU/1KG4 equivalent, key selection criteria include its four discrete gain states, laser-trimmed offset performance, over-voltage protected inputs (±40 V), digital address interface (A0/A1), and compatibility with TTL/CMOS logic without external supply.

Technical Context

The PGA204AU/1KG4 implements a three-op-amp instrumentation architecture with digitally selected internal feedback networks (25 kΩ resistors per stage), enabling precise gain switching via two TTL/CMOS-compatible address lines (A0, A1). Its input stage (A1/A2) provides high impedance (10¹⁰ Ω || 6 pF) and ±40 V safe input voltage tolerance, while the output stage (A3) features rail-to-rail–capable swing limited by ±1.5 V from rails at ±15 V supplies.

Gain selection is immediate and unlatched - changes in A0/A1 logic directly reconfigure the feedback network, with settling time ranging from 22 µs (G=1) to 1300 µs (G=1000) to 0.01% accuracy. Internal laser trimming ensures low offset drift and high CMRR across all gains, and the Ref pin allows output offset adjustment independent of gain setting.

Key Specifications

Pinout & Package

SOL-16 (SOIC-DW) surface-mount package, 16-pin, RoHS-compliant, MSL Level-3 (260°C peak reflow, 168 hr floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA128UA and AD8253ARMZ, PGA204AU/1KG4 offers the unique combination of parallel digital gain control, ±40 V input protection, and laser-trimmed 0.25 µV/°C drift in a mature, widely supported SOIC package-making it optimal for cost-constrained, field-deployed instrumentation where reliability and ease of integration outweigh advanced digital features.

Availability

PGA204AU/1KG4 is available at Aetrix Electronics and suitable for medical instrumentation, industrial data acquisition systems, and general-purpose analog boards requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for PGA204AU/1KG4 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 production, documentation, and technical support for legacy precision analog products including the PGA204 series.

The PGA204 product line was designed specifically for high-accuracy, low-drift signal conditioning in data acquisition and sensor interface applications where programmable gain, input protection, and minimal calibration effort are essential.

FAQ

What gain settings does the PGA204AU/1KG4 support, and how are they selected?

The PGA204AU/1KG4 supports four discrete gain settings: 1, 10, 100, and 1000 V/V. These are selected using two TTL/CMOS-compatible digital address inputs, A0 (pin 15) and A1 (pin 16), with logic states interpreted per the truth table (00 = 1×, 01 = 10×, 10 = 100×, 11 = 1000×). The PGA204AU/1KG4 does not require a separate logic supply-the digital ground (pin 14) serves as the reference, and inputs tolerate voltages from V– to V+.

Does the PGA204AU/1KG4 require external resistors for gain setting?

No, the PGA204AU/1KG4 integrates precision 25 kΩ feedback resistors internally and uses laser trimming to ensure accurate, temperature-stable gain ratios. External resistors are unnecessary for basic operation. The PGA204AU/1KG4 only requires external connections for power supplies, inputs, output, Ref, and digital address lines-no gain-setting components are needed on the PCB.

Can the PGA204AU/1KG4 operate from a single supply?

No, the PGA204AU/1KG4 is a dual-supply instrumentation amplifier requiring both positive (V+, pin 13) and negative (V–, pin 8) rails. It operates from ±4.5 V to ±18 V. While the Ref pin (pin 10) can be biased to a mid-supply voltage to enable pseudo-single-supply output swing, the internal op-amps require true bipolar supplies to function correctly. Attempting single-supply operation will result in undefined behavior or failure.

What is the purpose of the two VOS Adj pins (6 and 7) on the PGA204AU/1KG4?

Pins 6 and 7 (VOS Adj) provide access to the input-stage offset adjustment network. A single external potentiometer (200 kΩ to 1 MΩ) connected between these pins and V– allows fine-tuning of input-stage offset voltage-typically performed at highest gain (G=1000) with inputs shorted. This adjustment does not affect output-stage offset or temperature drift of the PGA204AU/1KG4, and should not be used to correct sensor or system-level offsets.

Is the PGA204AU/1KG4 pin-compatible with other PGA204 variants like PGA204AP or PGA204BU?

Yes, the PGA204AU/1KG4 shares identical pinout and electrical specifications with all PGA204 family members (e.g., PGA204AP, PGA204BP, PGA204BU), differing only in package type (SOIC-DW vs. PDIP) and temperature rating. All use the same 16-pin layout, gain logic, and functional behavior. However, thermal characteristics (θJA = 80°C/W) and reflow profile (MSL Level-3) apply specifically to the PGA204AU/1KG4's SOIC package.