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

2 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

3 Description
The INA351 is a selectable-gain instrumentation
amplifier with integrated reference buffer that offers
four gain options across the INA351ABS and
INA351CDS variants available in small packages. The
INA351ABS has gain options of 10 or 20 and the
INA351CDS has gain options of 30 or 50. These
gain options can be selected by toggling the gain
select (GS) pin. The INA351 is an excellent choice
for bridge-type sensing and for differential to singleended
conversion applications.
Built with precision matched integrated resistors, the
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 (ADCs)
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, the
INA351 is optimized for delivering performance. The
device achieves 86dB of minimum CMRR and an
accurate 0.1% of maximum gain error, along with
1.3mV of maximum offset across all gain options,
while consuming just 135μA of maximum quiescent
current. The INA351 has an integrated shutdown
option to turn off the amplifier when idle for additional
power savings in battery-powered applications.