LTC6373 Amplifiers

 ADI's LTC6373 is a precision instrumentation amplifier with fully differential outputs that include a highly matched internal resistor network to achieve excellent CMRR and extremely low gain error, gain drift, and gain nonlinearity. The user can easily program the gain to one of seven available settings through a 3-bit parallel interface (A2 to A0). The eighth state puts the part in shutdown, which reduces the current consumption to 250μA.

The LTC6373 features fully differential outputs to drive high performance, differential-input ADCs. The output common mode voltage is independently adjustable via the V_OCM pin. The combination of high impedance inputs, DC precision, low noise, low distortion, and high-speed differential ADC drive makes the LTC6373 an ideal candidate for optimizing data acquisition systems.

The LTC6373 is available in a 12-lead 4 mm x 4 mm DFN (LFCSP) package and is fully specified over the -40°C to +125°C temperature range.

Demo circuit DC2398A features the LTC6373 programmable gain instrumentation amplifier. The circuit’s gain can be controlled in several ways, such as by simply setting onboard jumpers or connecting an Arduino or Linduino (DC2026A) microcontroller board. The LTC6373 has fully differential outputs with independent common mode level shifting. The output common mode level can be set by the IC’s internal default or overdriven by the user.

The DC2398A can be powered by external bench supplies (typically ±15 V), but optionally also demonstrates the use of the LTC3265 dual low noise charge pump to generate ±15 V rails from a single 9 V to 12 V input supply. Design files for this circuit board are available.

Features

• Ultra-high input impedance enabling sensor agnostic interface, easy interface with any sensor without signal error
• Platform enabling front end provided by programable gains and low input bias current
• Drive many ADI ADCs directly, reducing components, power consumption, and design time