EVAL-KW4101Z

EVAL-KW4101Z is a precision integrating transimpedance amplifier KWIK demo board. This is a know-how with integrated knowledge (KWIK) demonstration board designed for evaluating current through a precision integrating transimpedance amplifier (TIA). It can measure femto ampere (fA) level of dark current of a TIA as well as pico ampere (pA) level of signal current with the included LED. The board is mainly an integrator circuit with a 24pF external film capacitor. Connected to the TIA's noninverting input pin is a voltage divider circuit, with R1 and R2 being 1.27kohm and 1kohm, respectively. This thereby sets the common-mode input voltage (CMV) to 2.2V. The main circuit involves a sensitive photodiode and is thus confined within a black box enclosure to reduce the effects of ambient lighting conditions. The EVAL-KW4101Z employs the ADA4351-2 for the integrator circuit. The ADA4351-2 is a compact, monolithic, dual-channel, precision programmable gain transimpedance amplifier (PGTIA).

• Enables quick measurement of input current from the photodiode using ADA4351-2
• Included LED allows to measure pA in light setting configuration, fA in dark setting configuration
• Circuit is enclosed by a black box to reduce the sensitivity to ambient lighting conditions
• Plug and play in ADALM2000 learning module
• ADA4351-2 can be operated using a supply voltage from 2.7V to 5.5V

Contents

EVAL-KW4101Z evaluation board, Black box enclosure.