Texas Instruments INA500 1.7V to 5.5V Difference Amplifiers
Texas Instruments INA500 1.7V to 5.5V Difference Amplifiers include an integrated op-amp and matched resistors offering three gain options. The INA500A amplifiers offer a gain option of 1, while the INA500B and INA500C versions offer gain options of 0.50 and 0.25, respectively. The precision-matched integrated resistors of the INA500 save BOM costs and board space by removing the need for precise and low-tolerance external resistors. These amplifiers can interface directly to low-speed, 8-bit, and 12-bit ADC. The INA500 amplifiers are an excellent choice for replacing the discrete implementation of difference amplifiers built with commodity amplifiers and discrete resistors. These amplifiers are offered in standard 6-pin packages such as SOT-23 and SC70 and a space-saving X2SON package.
The INA500 amplifiers achieve 75dB of minimum CMRR, an accurate ±0.05% maximum gain error, and 3.5mV of maximum offset (referred to output) in G = 1 configuration. These are voltage-sensing INAs in difference amplifier configurations with high input impedance of >1MΩ and low quiescent current of 13.5µA. The INA500 amplifiers can handle up to 27.5V (±13.75V) input common-mode voltage in G = 0.25 with 5.5V (±2.75V) supply voltage. These amplifiers are used in power tools, industrial AC-DC, string inverters, and wearable fitness and activity monitors.
Features
- Optimized for small-size, low-power, and low-cost
- > 1MΩ Ultra-high input impedance
- Three gain options (G = 1, 0.50, and 0.25)
- Good precision for 8-bit to 12-bit systems
- CMRR of 87dB (typical)
- Gain error of ±0.01% (typical)
- Offset voltage of ±0.70mV (typical)
- Space saving 0.8mm2 X2SON package
- 125kHz (typical) bandwidth
- Drives 200pF with <20% overshoot (typical)
- 13.5µA (typical) low quiescent current
- 1.7V (±0.85V) to 5.5V (±2.75V) supply range
- -40°C to 125°C specified temperature range
Applications
- Battery cell formation and test equipment
- String inverter
- EV charging station power module
- Battery energy storage system
- Power tools
- Industrial AC-DC
- Wearable fitness and activity monitor
Functional Block Diagram
NOTE: The input resistor (RIN) values are 1.08MΩ for INA500A, 1.44MΩ for INA500B, and 1.68MΩ for INA500C.
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