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Features ‰Chopper-stabilized PGIA (Programmable Gain Instrumentation Amplifier, 1x to 64x) – 6 nV/√Hz @ 0.1 Hz (No 1/f noise) at 64x – 1200 pA Input Current with Gains >1 ‰Delta-sigma Analog-to-digital Converter – Linearity Error: 0.0007% FS – Noise-free Resolution: Up to 23 bits ‰Two- or Four-channel Differential MUX ‰Scalable Input Span via Calibration – ±5 mV to differential ±2.5V ‰Scalable VREF Input: Up to Analog Supply ‰Simple Three-wire Serial Interface – SPI™ and Microwire™ Compatible – Schmitt Trigger on Serial Clock (SCLK) ‰R/W Calibration Registers Per Channel ‰Selectable Word Rates: 6.25 to 3,840 Sps ‰Selectable 50 or 60 Hz Rejection ‰Power Supply Configurations – VA+ = +5 V; VA- = 0 V; VD+ = +3 V to +5 V – VA+ = +2.5 V; VA- = -2.5 V; VD+ = +3 V to +5 V – VA+ = +3 V; VA- = -3 V; VD+ = +3 V