Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital traces separate. Also, use a low-ESR capacitor for the AVDD pin and a 0.1uF capacitor for the REF pin. Route the analog input traces away from the digital traces and keep them as short as possible.
To ensure the ADS7956SDBT is in the correct power-down mode, assert the PDWN pin low and the CS pin high. This will put the device in shutdown mode, reducing power consumption to less than 1uA. Make sure to follow the power-down sequence outlined in the datasheet to avoid any issues.
The recommended clock frequency for the ADS7956SDBT is between 1MHz to 20MHz. The conversion rate is dependent on the clock frequency, with a higher clock frequency resulting in a faster conversion rate. However, increasing the clock frequency also increases the power consumption. A clock frequency of 10MHz is a good starting point for most applications.
The ADS7956SDBT outputs 16-bit data in a serial format. The output data is in two's complement format, with the most significant bit (MSB) first. The output data is available on the DOUT pin, and the data is clocked out on the falling edge of the SCLK pin. Make sure to use a suitable serial interface, such as SPI, to read the output data.
The recommended input signal range for the ADS7956SDBT is between 0V to VREF (2.5V or 5V, depending on the VREF pin voltage). The input signal range affects the conversion accuracy, with signals closer to the VREF voltage resulting in better accuracy. Signals outside this range may result in reduced accuracy or even clipping.
ADS7956SDBT datasheet
by Texas Instruments
