Analogue to digital converters texas instruments tlc549cp this is the texas instruments tlc549cp 8 bit adc which features a tri state serial output for interfacing to microprocessors or microcontrollers the device has a 4mhz internal clock which controls the sampling process and an external io clock up to 11mhz which controls the serial transfer the chip select signal is used to start data transfer or set the output to tri state mode this is a low power cmos part and is ideal for battery