INA333-Q1

Part: INA333 (INA333AIDGKR) — Texas Instruments

Type: Zero-Drift, Rail-to-Rail Output Instrumentation Amplifier

Description: Micropower (50 μA typ) zero-drift instrumentation amplifier with 1.8–5.5 V supply, ±25 μV max offset (G ≥ 100), 0.1 μV/°C drift and single-resistor gain setting from 1 to 1000.

Operating Conditions:

• Supply voltage: 1.8–5.5 V (single); ±0.9 to ±2.75 V (dual)
• Operating temperature: -40 to 125 °C (specified range)
• Gain range: 1 to 1000 V/V, G = 1 + (100 kΩ / RG)
• Common-mode input range: (V-) + 0.1 V to (V+) - 0.1 V

Absolute Maximum Ratings:

• Max supply voltage: 7 V
• Analog input voltage: (V-) - 0.3 V to (V+) + 0.3 V
• Output short-circuit: continuous
• Max junction temperature: 150 °C
• Storage temperature: -65 to 150 °C

Key Specs:

• Offset voltage, RTI (TA = 25 °C): ±10 ±25/G μV typ, ±25 ±75/G μV max
• Offset drift (TA = -40 to +125 °C): ±0.1 ±0.5/G μV/°C max
• CMRR (DC to 60 Hz): 80 dB min at G = 1; 100 dB min at G = 10, 100, 1000
• Input bias current: ±70 pA typ, ±200 pA max; input offset current ±50 pA typ, ±200 pA max
• Input voltage noise: 50 nV/√Hz at 1 kHz (G = 100); 1 μVPP (0.1–10 Hz)
• Gain error (max): ±0.1% (G = 1), ±0.25% (G = 10, 100), ±0.5% (G = 1000)
• Bandwidth (-3 dB): 150 kHz (G = 1), 35 kHz (G = 10), 3.5 kHz (G = 100), 350 Hz (G = 1000)
• Quiescent current: 50 μA typ, 75 μA max (25 °C); 80 μA max (-40 to +125 °C)
• Slew rate: 0.16 V/μs (G = 1), 0.05 V/μs (G = 100), VS = 5 V

Features:

• Low offset voltage and drift
• Low noise, down to DC
• High CMRR
• Low input bias current
• Rail-to-rail output (within 50 mV of rail)
• RFI-filtered inputs
• Internal auto-calibration (zero-corrected every 8 μs)
• Laser-trimmed resistors for low gain error

Applications:

• Bridge amplifiers
• ECG amplifiers
• Pressure sensors
• Medical instrumentation
• Portable instrumentation
• Weigh scales
• Thermocouple amplifiers
• RTD sensor amplifiers
• Data acquisition

Package:

• VSSOP-8 (DGK), 3.00 mm × 3.00 mm
• WSON-8 (DRG), 3.00 mm × 3.00 mm

for VS = 1.8 V to 5.5 V at TA = 25°C, RL = 10 k Ω , VREF = VS / 2, and G = 1 (unless otherwise noted)

over operating free-air temperature range (unless otherwise noted) (1)

over operating free-air temperature range (unless otherwise noted)

The INA333 measures small differential voltage with high common-mode voltage developed between the noninverting and inverting input. The high input impedance makes the INA333 suitable for a wide range of applications. The ability to set the reference pin to adjust the functionality of the output signal offers additional flexibility that is practical for multiple configurations.