The ADS7812PB is a high-speed analog-to-digital converter, and as such, it requires careful layout and placement to minimize noise and ensure optimal performance. TI recommends placing the device close to the analog signal source, using a solid ground plane, and keeping digital signals away from the analog inputs. Additionally, the device should be decoupled with a 0.1uF capacitor between VCC and GND, and the analog input pins should be terminated with a 1kΩ resistor to GND.
The ADS7812PB requires a clock signal to operate, and the clock frequency should be between 1MHz and 20MHz. The clock signal should be a clean, low-jitter signal, and it's recommended to use a dedicated clock source or a clock buffer to drive the clock pin. Additionally, the clock pin should be decoupled with a 0.1uF capacitor to GND.
The recommended power-up sequence for the ADS7812PB is to first apply the analog power supply (AVCC), followed by the digital power supply (DVCC), and then the clock signal. This ensures that the device powers up correctly and minimizes the risk of latch-up or other issues.
The ADS7812PB outputs digital data in a serial format, and the data is clocked out on the rising edge of the clock signal. The digital output data should be captured using a digital receiver or a microcontroller, and it's recommended to use a buffer or a latch to capture the data to prevent data loss or corruption.
The typical conversion time for the ADS7812PB is 1.5 clock cycles, which corresponds to a maximum throughput of 1.33Msps at a clock frequency of 20MHz. However, the actual conversion time may vary depending on the clock frequency, input signal, and other factors.
ADS7812PB datasheet
by Texas Instruments
