Texas Instruments recommends a 4-layer PCB with a solid ground plane, and placing the ADC close to the analog signal source. Additionally, use short and direct traces for the analog input and reference voltage, and keep digital signals away from the analog section.
The ADS7816E/2K5 has an internal calibration circuit that is performed at power-up. However, it's recommended to perform an external calibration using an external reference voltage and a known input voltage to ensure accurate conversions.
The maximum sampling rate of the ADS7816E/2K5 is 250 kSPS. However, the power consumption increases with the sampling rate. At 250 kSPS, the typical power consumption is around 15 mW, while at 10 kSPS, it's around 5 mW.
Yes, the ADS7816E/2K5 can be used with an external reference voltage. The external reference voltage should be between 2.5 V and 5 V, and should have a low noise and low drift characteristics. Additionally, the reference voltage should be decoupled with a 10 nF capacitor to the AGND pin.
The ADS7816E/2K5 outputs 16-bit digital data in a serial format. The data is output in a MSB-first format, with the most significant bit (MSB) first. The output data can be read using a serial interface such as SPI or I2C.
ADS7816E/2K5 datasheet
by Texas Instruments
