Texas Instruments PGA206UAG4

Overview

PGA206UAG4 from Texas Instruments (originally Burr-Brown) is a high-speed, digitally programmable gain instrumentation amplifier with FET inputs, ±40V input over-voltage protection, 3.5µs settling time to 0.01%, and selectable gains of 1, 2, 4, or 8 V/V - used in precision multiplexed data acquisition systems for medical sensors and industrial analog front-ends.

For engineers reviewing the PGA206UAG4 datasheet, PGA206UAG4 pinout, PGA206UAG4 application, or PGA206UAG4 equivalent, key selection criteria include gain-switching speed (500ns), input bias current (≤100pA), CMRR up to 100dB at G=4/5, output swing limits (±(|V_S|−2.3V)), and SOIC-16 package compatibility with automated SMT assembly.

Technical Context

The PGA206UAG4 implements a three-op-amp instrumentation architecture with digitally controlled feedback networks routed via internal CMOS switches. Gain selection is performed by two TTL/CMOS-compatible address lines (A0, A1), enabling immediate, unlatched gain changes without internal latching logic.

Its FET-input stages deliver ultra-low input bias current (≤100pA) and high input impedance (10¹³ Ω || 1 pF), while integrated ±40V input protection operates even with power supplies off. The device is laser-trimmed for low offset voltage (±1.5mV max) and low drift (±2 µV/°C), supporting stable DC-coupled measurements across –40°C to +85°C.

Key Specifications

Pinout & Package

SOL-16 surface-mount package (SOIC-DW, 16-pin), 7.5 mm × 10.3 mm body, 1.27 mm pitch, RoHS-compliant NIPDAUAG finish, MSL Level-3 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PGA206UAG4, INA2332AIDR trades programmability and ruggedness for speed and noise performance, while PGA207UA retains all mechanical and electrical compatibility but shifts gain steps to optimize for different scaling needs - making it the most seamless alternative for layout reuse.

Availability

PGA206UAG4 is available at Aetrix Electronics and suitable for medical monitoring equipment, industrial PLC analog input modules, and PC-based test instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for PGA206UAG4 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 its precision analog portfolio, emphasizing high-accuracy signal conditioning for industrial, medical, and test equipment.

The PGA206UAG4 belongs to TI's legacy programmable-gain instrumentation amplifier product line, designed specifically for multiplexed, high-impedance sensor interfaces demanding robust input protection, fast settling, and minimal calibration overhead.

FAQ

What are the valid gain settings for the PGA206UAG4?

The PGA206UAG4 supports exactly four discrete gain settings: 1 V/V, 2 V/V, 4 V/V, and 8 V/V. These are selected exclusively by the logic states of pins A0 and A1 per the truth table in the datasheet. No intermediate or fractional gains are available, and gain changes occur immediately upon address input transition without internal latching or delay beyond the 500 ns digital switching time.

Does the PGA206UAG4 require external components for basic operation?

Yes - the PGA206UAG4 requires local 1 µF bypass capacitors on both V+ and V– pins, a low-impedance connection from Ref to system ground, and a direct short between Sense (pin 12) and VO (pin 11). Input bias current return paths (e.g., matched resistors to DGND or AGND) must also be provided for VIN+ and VIN– to prevent saturation. No external gain-setting resistors are needed, as feedback is fully internal.

Can the PGA206UAG4 operate with a single supply?

No - the PGA206UAG4 is specified only for dual-supply operation from ±4.5 V to ±18 V. Its input common-mode range and output swing are asymmetric around ground and depend on both V+ and V– rails. Single-supply operation is not supported, and attempting it will result in undefined behavior, input stage saturation, or failure to meet datasheet specifications for offset, CMRR, or bandwidth.

How does input over-voltage protection work on the PGA206UAG4 when power is off?

The PGA206UAG4 incorporates internal back-to-back diode clamps on each input (VIN+ and VIN–) tied to the supply rails. When power is absent, these diodes conduct into the external supply nodes, limiting input voltage to approximately ±0.7 V beyond the rail potentials. Since the absolute maximum rating permits ±40 V regardless of supply state, the protection relies on external current-limiting resistors (typically ≥10 kΩ) in series with inputs to restrict fault current to safe levels (<1 mA) during sustained over-voltage events.

Is the PGA206UAG4 pin-compatible with other members of the PGA206/207 family?

Yes - the PGA206UAG4 shares identical pinout, package dimensions, and electrical interface with all PGA206 and PGA207 variants in SOIC-16 (DW) packaging, including PGA206UA, PGA206UA.A, PGA207UA, and PGA207UA.A. This allows direct PCB replacement within the same package footprint, though gain tables differ between PGA206 (1/2/4/8) and PGA207 (1/2/5/10) versions, requiring firmware or logic updates if swapping between families.