Part Details for AD7887ARM by Analog Devices Inc

A good layout and routing practice is to keep the analog and digital sections separate, use a ground plane, and keep the analog input traces short and away from digital traces. Also, use a decoupling capacitor (e.g., 10nF) between VDD and GND, and a bypass capacitor (e.g., 100nF) between VREF and GND.

The AD7887ARM has an internal calibration circuit that can be enabled by setting the CAL bit in the control register. The calibration process involves shorting the analog input pins to GND and then to VREF, and then reading the calibration coefficients from the device. These coefficients can then be used to correct for offset and gain errors.

The maximum sampling rate of the AD7887ARM is 125kSPS. However, the actual sampling rate may be limited by the system clock frequency, the conversion mode, and the number of channels being converted. Increasing the sampling rate will also increase the power consumption, which can be estimated using the formula: Power (mW) = (VDD x IDD) + (fCLK x CLOAD x VDD^2), where IDD is the quiescent current, fCLK is the clock frequency, and CLOAD is the load capacitance.

The AD7887ARM has internal overvoltage protection diodes on the analog input pins that can withstand voltages up to ±16.5V. However, it is still recommended to use external protection circuitry, such as voltage-limiting resistors or clamping diodes, to prevent damage to the device in case of overvoltage conditions.

Yes, the AD7887ARM can be used in a multiplexed mode, where multiple analog input channels are connected to a single ADC input pin through an external multiplexer. To configure the device for multiplexed mode, set the MUX bit in the control register, and then use the channel select bits to select the desired input channel.