Table 4-1. Tia Jumper Block Connections; Table 4-2. Tia Pin Socket Configurations - Texas Instruments OPA928 User Manual

Evaluation module

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Table of Contents

EVM Circuit Description

4.2.1 Configure the TIA

The TIA is configured through the pin sockets, or by installing and removing jumpers across certain jumper

blocks. JP2 and JP3 are separated into single-pin jumper blocks JP2a/JP2b and JP3a/JP3b. Separating these

jumper blocks prevents current from leaking through the jumper block material when the jumpers are uninstalled,

and allows space for guard copper between the output and any disconnected feedback components. A special

length shunt jumper is included in the EVM to connect across JP2 or JP3. The default configuration installs the

shunt jumper at JP2, placing the 10-GΩ resistor in the feedback path.

Terminal block J7 and jumper block JP4 control the additional functions described in

Table 4-1

lists the components and connections associated with each jumper block.

Designator

JP2a/JP2b

JP3a/JP3b

JP4

Pin sockets allow easy configuration with through-hole components, such as photodiodes at the input or large

value resistors in the feedback path. P3 is a surface-mounted pin socket array that allows through-hole sensors

of various sizes to be easily configured at the input. P3 can be driven by the Sensor Bias terminal located at J9.

Table 4-2

lists the nodes associated with each pin socket.

Designator

OPA928 Evaluation Module