INA351CDSIDSGR

INA351 is a selectable-gain instrumentation amplifier with integrated reference buffer that offers four gain options across INA351ABS and INA351CDS variants available in small packages. INA351ABS has gain options of 10 or 20 and INA351CDS has gain options of 30 or 50. These gain options can be selected by toggling the gain select (GS) pin. INA351 is an excellent choice for bridge-type sensing and for differential to single-ended conversion applications. Built with precision matched integrated resistors, INA351 saves on BOM costs, pick-and-place machine handling costs, and board space by removing the need for precise or closely-matched external resistors. The INA351 can interface directly to low-speed, 10-bit to 14-bit, analog-to-digital converters (ADC) and is an excellent choice for replacing discrete implementation of instrumentation amplifiers built with commodity amplifiers and discrete resistors. Designed with the three-amplifier architecture, INA351 is optimized for delivering performance. The device achieves 86 dB of minimum CMRR and an accurate 0.1% of maximum gain error, along with 1.3 mV of maximum offset across all gain options, while consuming just 135 μA of maximum quiescent current. INA351 has an integrated shutdown option to turn off the amplifier when idle for additional power savings in battery powered applications.

Applications

• Bridge network sensing
• Differential to single-ended conversion
• Weigh scale
• Analog input module
• Flow transmitter
• Wearable fitness and activity monitor
• Blood glucose monitor
• Pressure and temperature sensing

Key features

• Designed for size, cost, and power conscious applications
• Selectable gain options with integrated reference buffer
• G = 10 or Q = 20 (INA351ABS)
• G = 30 or G = 50 (INA351CDS)
• Space saving ultra-small package options
• 10-pin X2QFN (RUG) – 3 mm²
• 8-pin WSON (DSG) - 4 mm²
• 8-pin SOT23-THN (DDF) - 4.64 mm²
• Optimized performance for 10-bit to 14-bit systems
• CMRR: 95 dB (typical) across all gains
• Offset voltage: 0.2 mV (typical) across all gains
• Gain error (typical):
• 0.015% for G = 10, G = 50
• 0.020% for Q = 20, G = 30
• Bandwidth: 100 kHz for G = 10 (typical)
• Drives 500 pF with less than 20% overshoot (typical)
• Optimized quiescent current: 110 μA (typical)
• Shutdown option for power conscious applications
• Supply range: 1.8 V (±0.9 V) to 5.5 V (±2.75 V)
• Specified temperature range: -40°C to 125°C