1 Features
• Ultra-low noise: 1-nV/√Hz input voltage noise
(typical)
• Precision super-beta input performance:
– Low offset voltage: 35 μV (maximum)
– Low offset voltage drift: 0.4 μV/°C (maximum)
– Low input bias current: 20 nA (maximum)
– Low gain drift: 5 ppm/°C for G = 1 (maximum)
• Bandwidth: 28 MHz (G = 1), 8 MHz (G = 100)
• Slew rate: 35 V/μs
• Common-mode rejection: 120 dB (minimum) for
maximum gain
• Supply range:
– Single supply: 8 V to 36 V
– Dual supply: ±4 V to ±18 V
• Specified temperature range:
–40°C to +125°C
• Packages: 8-pin SOIC and VSSOP

2 Applications
• Analog input module
• Microphone preamplifier
• Flow transmitter
• Battery test
• LCD test
• Electrocardiogram (ECG)
• Surgical equipment
• Process analytics (pH, gas, concentration, force
and humidity)

3 Description
The INA849 is an ultra-low noise instrumentation
amplifier optimized for maximum accuracy in highresolution
systems and operation over a wide singlesupply
or dual-supply range. The device offers
significantly lower input bias current than competitors
as a result of super-beta input transistors. A state-ofthe-
art manufacturing process provides exceptionally
low voltage noise, input offset voltage, and offset
voltage drift.
Precisely matched integrated resistors provide a high,
92-dB (G = 1) common-mode rejection across the full
input common-mode range. A single external resistor
sets any gain from 1 to 10,000. The current-feedback
topology of the INA849 provides wide bandwidth at
higher gains for very-small, fast-moving signals. For
example, the device provides 8 MHz of bandwidth
at G = 100, and 28 MHz at a G = 1, with a fast
0.4-μs settling time (0.01%) for directly driving highresolution,
analog-to-digital converters (ADCs).