Texas Instruments OPAx863A Voltage-Feedback Amplifiers
Texas Instruments OPAx863A Voltage-Feedback Amplifiers are low-power, unity-gain stable, rail-to-rail input and output, voltage-feedback operational amplifiers. These are trimmed in the package to offer high precision performance with a maximum input offset voltage of 95µV and offset drift of 1.2µV/°C for high accuracy measurements over temperature.
The OPAx863A devices offer a gain-bandwidth product of 50MHz, a slew rate of 100V/µs with a voltage noise density of 6.3nV/√Hz while consuming only 800µA per channel. The rail-to-rail input stage with 2.7V supply operation is helpful in portable battery-powered applications. The rail-to-rail input stage is well matched for gain-bandwidth product and noise across the full input common-mode voltage range, enabling superior performance with a wide-input dynamic range.
The Texas Instruments OPAx863A devices include overload power limiting to limit the increase in IQ with saturated outputs, thereby preventing excessive power dissipation in power-conscious battery-operated systems. The output stage is short-circuit protected, making it conducive to ruggedized environments.
Features
- 50MHz gain-bandwidth product
- High precision
- 95µV (maximum) input offset voltage
- 1.2µV/°C (maximum) offset drift
- Low power
- 800µA/ch (typical) quiescent current
- 2.7V to 12.6V supply voltage
- 6.3nV/√Hz input voltage noise
- 100V/µs slew rate
- Rail-to-rail input and output
- HD2/HD3: –129dBc/–138dBc at 20kHz (2VPP)
- –40°C to +125°C operating temperature range
- Additional features
- Overload power limit
- Output short-circuit protection
Applications
- Low-power SAR and ΔΣ ADC driver
- ADC reference buffer
- Low-side current sensing
- Photodiode TIA interface
- Inductive sensing
- Battery-powered instrumentation
- Gain and active filter stages
Functional Block Diagram
