ADA4351-2

• Full featured evaluation board for the ADA4351-2, a dual-channel, PGTIA in a 3 mm × 3 mm, 16-lead LFCSP with no exposed pad
• Enables quick prototyping
• Provisions for user-defined circuit configuration, including provisions for photodiodes
• Available edge-mounted SMA connectors and test points for simple connection with test equipment

The EVAL-ADA4351-2EBZ evaluation board is designed to help users evaluate the ADA4351-2, a two-channel programmable gain transimpedance amplifier (PGTIA) that features an integrated gain switching network with two user-defined gain states that can be set via external resistors, offered in a 3 mm × 3mm × 0.78 mm, 16-lead lead frame chip scale package (LFCSP).

The EVAL-ADA4351-2EBZ is a 4-layer printed circuit board (PCB) with dimensions at 2.9 inches x 2.25 inches. Figure 1 and Figure 2 in the user guide shows the top and bottom view of the EVAL-ADA4351-2EBZ, respectively. The EVAL-ADA4351-2EBZ comes populated with the key components that allow users to run and to evaluate the board quickly and with relative ease. That aside, the EVAL-ADA4351-2EBZ also provides open resistor and capacitor slots on its input and output stages, allowing the user to install components with user-defined values for connections such as a low-pass filter (LPF) or voltage divider.

The EVAL-ADA4351-2EBZ is accessible through Subminiature Version A (SMA) female socket edge mounts that allow users to directly connect test equipment to the inputs and outputs of both channels, as well as the gain switch control pins. The EVAL-ADA4351-2EBZ also comes with an unpopulated photodiode slot on each channel, allowing for quick prototyping.

For full details on the ADA4351-2, see the ADA4351-2 data sheet, which should be consulted in conjunction with the user guide when using the EVAL-ADA4351-2EBZ.

• Enables quick measurement of input current from the photodiode using ADA4351-2.
• The included LED allows to measure pA in light setting configuration and fA in dark setting configuration.
• The circuit is enclosed by a black box to reduce the sensitivity to ambient lighting conditions.
• Plug and play in ADALM2000 learning module

The EVAL-KW4101Z 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 light-emitting diode (LED).

The EVAL-KW4101Z 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 1.27kΩ and 1kΩ, 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. See Figure 1 for the schematic diagram of the ADA4351-2 configured as an integrator with an external capacitor, resistor divider at the input, and a single supply of 5V.

Please see the User Guide for the full description.