User's Guide
TIDU443 – August 2014
MSP430F2274 Transimpedance Amplifier (TIDM-TIA)
User's Guide
1
Introduction
This manual describes the TIDM-TIA hardware and how to use it. The TIDM-TIA uses a MSP430F2274
microcontroller to convert the current produced by a photodiode into a voltage. The TIDM-TIA converts
current to voltage by using one of the MSP430F2274’s integrated op-amps and an external feedback
resistor. This voltage is then sampled by the ADC on the MSP430F2274 and converted to a 10-bit value.
Resulting conversion values can then be used to turn the LED on or off based on simple logic. Other
GPIO pins are also available to use externally. The entire process of the TIA is indicated in
Figure 1
.
Figure 1. TIA Block Diagram
The TIDM-TIA is programmable and powered by a 4-wire JTAG connection or by an external source
through an external voltage pin.
Find more information on the
MSP430F2274 datasheet
.
For more information on transimpedance amplifiers and their properties, see the Transimpedance
Considerations for High-Speed Amplifiers and Compensate Transimpedance Amplifiers Intuitively
resources in
Section 6
.
1
TIDU443 – August 2014
MSP430F2274 Transimpedance Amplifier (TIDM-TIA) User's Guide
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
