EVAL-CN0407-SDPZ, Ultrahigh Sensitivity Femtoampere Measurement Platform Evaluation Board based on AD7172-2

EVAL-CN0407-SDPZ, Evaluation Board provides a reference design for real-world application by partitioning the system into a low-leakage mezzanine board and a data acquisition board. The input signal conditioning is implemented with the ADA4530-1 on the mezzanine board. The ADA4530-1 is an electrometer-grade amplifier with ultralow input bias current of 20 fA maximum at 85 oC. A guard buffer is integrated on the chip to isolate the input pins from leakage to the printed circuit board (PCB). The default amplifier configuration is in the transimpedance mode with a 10 G-Ohm glass resistor and a metal shield that prevents leakage current from entering any of the high impedance paths on the board