1 Features
• Ideal for size, cost, and power conscious designs
• Selectable gain options
– G = 10 or G = 20 (INA350ABS)
– G = 30 or G = 50 (INA350CDS)
• 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 (typ) across all gains
– Offset voltage: 0.2 mV (typ) across all gains
– Gain error (typ):
• 0.05% for G = 10; 0.06% for G = 20
• 0.075% for G = 30; 0.082% for G = 50
• Bandwidth: 100 kHz for G = 10 (typ)
• Drives 500 pF with less than 20% overshoot (typ)
• Optimized quiescent current: 100 μA (typ)
• 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
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
INA350 is a selectable-gain instrumentation amplifier
that offers four gain options across INA350ABS and
INA350CDS variants available in small packages.
INA350ABS has gain options of 10 or 20 and
INA350CDS has gain options of 30 or 50. These
gain options can be selected by toggling the gain
select (GS) pin. INA350 is ideal for bridge-type
sensing and for differential to single-ended conversion
applications.
Built with precision matched integrated resistors,
INA350 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 device interface directly to low-speed,
10-bit to 14-bit, analog-to-digital converters (ADC)
and is ideal for replacing discrete implementation
of instrumentation amplifiers built with commodity
amplifiers and discrete resistors.
Designed with the three-amplifier architecture, INA350
is optimized for delivering performance. It achieves
85 dB of minimum CMRR and 0.6% of maximum
gain error, along with 1.2 mV of maximum offset
across all gain options, while consuming just 125 μA
of maximum quiescent current. It has an integrated
shutdown option to turn off the amplifier when idle
for additional power savings in battery powered
applications.