Texas Instruments recommends a 4-layer PCB with a solid ground plane, and placing the ADC close to the analog signal sources. Decoupling capacitors should be placed as close as possible to the VCC and GND pins. A dedicated analog ground plane is also recommended.
The ADS7809PB outputs 16-bit data in a serial format. Engineers should use a microcontroller or FPGA to receive and process the data. The data can be clocked out of the ADC using the SCLK pin, and the microcontroller can use a SPI or serial interface to receive the data.
The maximum sampling rate of the ADS7809PB is 100 kSPS (kilosamples per second). However, the actual sampling rate may be limited by the system's clock frequency, analog input bandwidth, and digital output data rate.
The ADS7809PB has an internal calibration circuit that can be initiated by setting the CAL pin high. The calibration process takes approximately 100 μs. Engineers can also perform external calibration by applying a known input voltage and adjusting the offset and gain errors.
The typical power consumption of the ADS7809PB is 15 mW at 2.7 V and 100 kSPS. However, the actual power consumption may vary depending on the operating frequency, input voltage range, and output data rate.
ADS7809PB datasheet
by Texas Instruments
