The MAX4208/MAX4209 ultra-low offset and drift instrumentation
amplifiers feature exceptional precision specifications,
low power consumption, rail-to-rail output,
excellent gain-bandwidth product, and buffered
REFIN/MODE input in a very small µMAX® package.
These devices use a patented† spread-spectrum,
autozeroing technique that constantly measures and
corrects the input offset, eliminating drift over time and temperature
and the effect of 1/f noise. This technique
achieves less than 20µV offset voltage, allows ground-sensing
capability, provides ultra-low CMOS input bias current
and increased common-mode rejection performance.
The MAX4208/MAX4209 provide high-impedance inputs
optimized for small-signal differential voltages (±100mV).
All devices provide a gain-bandwidth product of 750kHz.
The MAX4208 provides an adjustable gain with two
external resistors or unity gain with FB connected to OUT.
The MAX4209 is available in fixed gains of 10V/V, 100V/V,
or 1000V/V (suffixed T, H, and K) with ±0.03% (typ) accuracy.
Both devices include a reference input (REF) to
level-shift the output, allowing for bipolar signals in single-supply
applications. In both devices, REFIN/MODE is an
input to a precision unity-gain buffer, which sets the REF
voltage to level-shift the output. The internal REF buffer
allows the reference to be set by a simple resistive divider
or an ADC reference without any loading error.
The MAX4208/MAX4209 operate with a 2.85V to 5.5V
single-supply voltage and consume only 750µA
of quiescent current (when the internal buffer is off) and
only 1.4µA in shutdown mode. These amplifiers
also operate with ±2.5V dual supplies with REF
connected to ground and REFIN/MODE to VSS.
The MAX4208/MAX4209 are available in space-saving
8-pin µMAX packages and are specified over the automotive
operating temperature range (-40°C to +125°C).
Download
E-Mail
