ADC 11 Click as its foundation uses the LTC1864, a 16-bit successive approximation A/D converter with a sample-and-hold feature that operates on a single 5V supply from Analog Devices. The supply current, which can be the only 850μA at 250ksps, drops at lower speeds because the LTC1864 automatically power-down between conversions. The high impedance analog input and the ability to operate with reduced spans down to 1V full scale allow direct connection to signal sources in many applications, eliminating the need for external gain stages. Equipped with the 3-wire SPI serial interface and extremely high sample rate-to-power ratio, this Click board™ represents an ideal solution for compact, low power, high-speed systems.

ADC 11 click communicates with MCU through the simple 3-wire serial I/O compatible with industry-standard SPI interface. The LTC1864 has an internal conversion clock so that the clock rate does not affect the conversion. This fact allows the clock rate to run to 20MHz without concern for sample-and-hold droop at low clock frequencies or clocking the ADC too fast at high clock frequencies. The data transfer requires only 16 clock cycles which minimize the amount of time necessary to transfer the data. The entire conversion can be transferred in only 800ns if the conversion clock runs at the maximum rate of 20MHz.

This Click board™ operates only with a 5V logic voltage level. The board must perform appropriate logic voltage level conversion before use with MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development