Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital traces separate. Additionally, 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 avoid crossing them over.
The ADS7953SBRHBT has a power-on reset (POR) circuit that ensures the device is in a valid state after power-up. However, it's recommended to add an external reset circuit to ensure the device is in a valid state after power-up. A 10kΩ pull-up resistor on the RESET pin to AVDD and a 0.1uF capacitor from RESET to GND can be used.
The recommended clock frequency for the ADS7953SBRHBT is between 10MHz to 20MHz. The conversion rate is dependent on the clock frequency, with a higher clock frequency resulting in a faster conversion rate. However, a higher clock frequency also increases the power consumption.
The ADS7953SBRHBT 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 data is output on the DOUT pin, and the data is valid on the falling edge of the SCLK pin.
The recommended input signal range for the ADS7953SBRHBT is between 0V to VREF (2.5V or 5V). The input signal range affects the conversion accuracy, with a smaller input range resulting in higher accuracy. However, a smaller input range also reduces the dynamic range of the converter.
ADS7953SBRHBT datasheet
by Texas Instruments
Findchips
