The AFE44x0SPO2EVM is intended for evaluating AFE4400 and AFE4490 devices. The family of devices are fully integrated AFE ideally suited for Pulse Oximeter applications and consist of low noise receive channel, the LED transmit section and diagnostics for sensor and LED fault detection. The AFE4400/AFE4490 has very highly configurable timing controller enabling the user to have complete control of the device’s timing characteristics. The device also has an integrated oscillator working off an external crystal to ease clocking requirements and provide a low jitter clock to the AFE44x0. The device communicates to an external host processor using the Serial Peripheral Interface (SPI).
The purpose of the AFE44x0SPO2EVM is to expedite evaluation and system development activities related to AFE44x0 devices.
The Texas Instruments TPS3700EVM-202 evaluation module (EVM) helps design engineers evaluate the operation and performance of the TPS3700 High-Voltage Window Comparator. The EVM contains an over- and under-voltage supervisory circuit with a wide supply range, independent open drain outputs, very low quiescent current and high accuracy. Header connectors are provided for easy connection to external test and application circuitry.
The TPS54060 DC/DC converter is designed to provide up to a 0.5-A output from an input voltage source of 3.5V to 60V. Rated input voltage and output current range for the TPS54060EVM-590 evaluation module are given in Table 1 of the User Guide. This evaluation module is designed to demonstrate transformer-coupled split rail operation with dual outputs providing ±18V at up to ±100mA. The -18V output is used as the ground reference for the TPS54060 in this application, which allows the sum of the positive and negative outputs to be divided and sent to the VSNS pin for regulation. The switching frequency is externally set to 300kHz with a resistor at the RT/CLK pin, and the compensation components are also external to the integrated circuit (IC). The high-side MOSFET is incorporated inside the TPS54060 package along with the gate drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS54060 to achieve high efficiency and helps keep the junction temperature low at high output currents. Additionally, the TPS54060 provides adjustable slow start and undervoltage lockout inputs.