Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. The analog input traces should be short and direct, and the digital output traces should be routed away from the analog inputs. Additionally, decoupling capacitors should be placed close to the device.
The ADS7886SDBVT has an internal calibration circuit that can be enabled by setting the CAL bit in the control register. The device should be calibrated after power-up and after any changes to the reference voltage or analog input range. The calibration process takes approximately 100 μs.
The recommended power-up sequence is to first apply the analog supply voltage (AVDD), followed by the digital supply voltage (DVDD), and then the clock signal. The device should be powered up in this order to ensure proper operation and to prevent latch-up.
The ADS7886SDBVT outputs 16-bit data in two's complement format. The digital output data should be handled as unsigned data, and the user should ensure that the receiving device can handle the output data format. Additionally, the user should ensure that the digital output data is properly synchronized with the clock signal.
The recommended method is to use a low-impedance source, such as an op-amp, to drive the analog input. The analog input should be driven differentially, and the input signal should be within the specified input range. Additionally, the user should ensure that the analog input is properly filtered to remove any high-frequency noise.
ADS7886SDBVT datasheet
by Texas Instruments
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