First zero-drift 36V instrumentation amplifier delivers pinpoint accuracy

Introduced as the industry’s first, a new zero-drift, 36V instrumentation amplifier, the INA188 has been unveiled by Texas Instruments (TI). The device delivers high accuracy for precise DC and low-frequency measurements in applications such as test and measurement, medical, and industrial process control equipment. It also eliminates the 1/f corner and features best-in-class offset drift to enable accurate measurement over the full extended industrial temperature range. Key features : 1 - Industry’s lowest offset drift optimizes long-term temperature stability: The zero-drift architecture used in the INA188 delivers high accuracy for high-voltage precision-measurement applications. Compared to competitive solutions, it enables an offset voltage of 25µV and a 33 percent lower offset-voltage drift of 80nV/C to provide long-term temperature stability over the lifetime of the end equipment. 2 - No 1/f corner and low DC noise enable precise measurements at low frequencies: The INA188 generates only 250nVPP of noise from 0.1Hz to 10Hz, with no 1/f corner frequency between broadband and near-DC. When combined with the INA188’s broadband noise floor of 12.5nV/vHz, the amplifier provides unrivalled precision for low-frequency applications. 3 - High voltage ensures signal integrity: Capable of operating at up to 36V, the INA188 helps maintain signal integrity over the full extended temperature range by allowing larger gains than lower voltage instrumentation amplifiers. Tools and support to cultivate design Engineers designing with the INA188 amplifier can quickly achieve optimum precision for their systems with the following support tools: A - Evaluation module (EVM): Users can evaluate the performance of the INA188 with the universal instrumentation amplifier EVM (SO8). B - Macromodel: Verify board-level signal integrity requirements and device behaviour with a free TINA-TI SPICE macromodel. C - TI Designs reference design: A three-terminal PLC reference design featuring the INA188 converts +/-10V or +/-20mA inputs to a single-ended output voltage for 5V analog-to-digital converters (ADCs). Additionally, the design features the REF3225 precision voltage reference integrated circuit (IC). D - Support: Users can visit the TI Precision Amplifier Forum in the TI E2E Community to search for solutions, get help, share knowledge, and solve problems with fellow engineers and TI experts. E - Vcm vs. Vout calculator: A standalone downloadable tool for instrumentation amplifiers plots the Vcm versus Vout curve given the designer’s specific design requirements, including single- or dual-supply, gain and reference voltage. Powering the INA188 - TI offers a full portfolio of power management products that can support the INA188, including the TPS65130 split-rail DC-DC converter or the LMR70503 SIMPLE SWITCHER buck-boost converter to achieve dual-supply operation. For single-supply operation, the INA188 with the LM7705 negative bias generator offers true zero output. The INA188 is available now in a 4.9mm x 3.91mm small outline integrated circuit (SOIC) package. It will be available in early 4Q15 in a 4mm x 4mm very-thin small outline no lead (WSON) package.