INA848

• Fixed gain of 2000 V/V
• Access to internal nodes for filtering
• Ultra-low noise: 1.5 nV/√Hz input voltage noise (maximum)
• Precision super-beta input performance:
  • Low offset voltage: 35 µV (maximum)
  • Low offset voltage drift: 0.45 µV/°C (maximum)
  • Low input bias current: 25 nA (typical)
  • Low gain drift: 5 ppm/°C (maximum)
• Bandwidth: 2.8 MHz
• Slew rate: 45 V/µs
• Common-mode rejection: 132 dB (minimum)
• Supply range:
  • Single supply: 8 V to 36 V
  • Dual supply: ±4 V to ±18 V
• Specified temperature range: –40°C to +125°C
• Package: 8-pin SOIC

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The INA848 is a fixed-gain instrumentation amplifier optimized for high-precision measurements, such as very-small, fast, differential input signals. TI’s super-beta topology provides a very low input bias current and current noise. The well-matched transistors help achieve a very low offset and offset drift. Matching of the internal resistors yields a high common-mode rejection ratio of 132 dB across the full input-voltage range, and a very low gain drift error of 5 ppm/⁰C (max).

The current-feedback topology of the INA848 produces a wide bandwidth of 2.8 MHz at a fixed gain of 2000, thereby eliminating the need for subsequent gain stages. The very-low noise floor of 1.3 nV/√Hz minimizes the impact on the equivalent number of bits (ENOB) when interfacing with high-resolution analog-to-digital converters (ADCs). The INA848 provides the flexibility of adding filters between the gain stages (pins 2 and 3) to maintain an adequate signal integrity.

These unique features of the INA848 make this device an excellent choice for applications requiring high-precision measurements, such as high-end medical instrumentation, electroencephalography, vibration sensing, and displacement measurements.

This device is designed for 8-V to 36-V single supplies, or ±4-V to ±18-V on dual supplies.