Date: 24/01/2007

Analog Devices new Instrumentation Amplifier features better noise performance

AD8231, Instrumentation Amplifier from Analog Devices features very low input noise of 32nV/rt-Hz and CMRR of 122dB while delivering rail to rail inputs and outputs up to 1MHz bandwidth. If you have high impedance sensor and can only produce very low voltage output and in noisy and harsh weather conditions; go for this Instrumentation Amplifier (IN AMP). This is a zero drift amplifier whose gain can be software programmable from 1 to 128 through a 3 pin interface. The gain can be repeatedly adjusted through digital logic setting. The gain can also be set by pin-strapping.

The sensors such as resistance temperature detectors, thermocouples and automotive pressure sensors can go well with this IN AMP.

The AD8231 integrates auto-zero amplifiers to maintain a voltage offset of only 50nV/Deg C. The internal gain-setting resistors limit gain coefficient temperature drift to 10 ppm/°C. The temperature range of -40°C to 125°C makes it highly suitable for harsh weather conditions. A center paddle is provided below the package to keep the device tightly fixed/soldered to the PCB even during worst vibrations.
Keeping the easy interface to ADCs in mind, AD8231 has built-in op amp to provide differential output to ADCs. Op amp can also be creatively used for your other analog processing requirements.
The operating voltage is 3.3V to 5V. Suggested ADCs to interface are AD7942, AD7685, and AD7980.

Available: Sampling now volumes in April -07.
Listed price: each $1.69 for 1K pieces order.