Analog Devices Inc. EVAL-KW4101Z KWIK Demo Board
Analog Devices EVAL-KW4101Z KWIK Demo Board is a know-how with integrated knowledge (KWIK) demonstration board designed for evaluating current through a precision integrating transimpedance amplifier (TIA). It can measure the femto ampere (fA) level of dark current of a TIA as well as the pico ampere (pA) level of signal current with the included light-emitting diode (LED).
The Analog Devices EVAL-KW4101Z is mainly an integrator circuit with a 24pF external film capacitor. A voltage divider circuit is connected to the TIA's non-inverting input pin, with R1 and R2 being 1.27kΩ and 1kΩ, respectively. This feature 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) that offers a groundbreaking solution for accurately measuring small currents across a wide dynamic range.
The ADA4351-2 can be operated using a supply voltage from 2.7V to 5.5V. It can be conveniently powered by the ADALM2000 with a single 5V supply, enhancing usability in different setups. It is also configured to receive a signal from the ADALM2000 signal generator.
Features
- Enables quick measurement of input current from the photodiode using ADA4351-2
- The included LED allows measuring of pA in light setting configuration and fA in dark setting configuration
- A black box encloses the circuit to reduce the sensitivity to ambient lighting conditions
- Plug and play in the ADALM2000 learning module
Applications
- Precision current to voltage (I to V) conversion
- Programmable gain TIAs
- Photodetector interface and amplification
- Optical networking equipment
- Optical power measurement
- Instrumentation-spectroscopy and chromatography
- Precision data acquisition systems (DAQ)
Kit Contents
- EVAL-KW4101Z evaluation board
- Black box enclosure
Required Equipment
- ADALM2000 active learning module
- USB-A to micro-USB cable
- Computer
- Scopy software
Board Layout
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