CMOS, 24-Bit Sigma-Delta, Signal Conditioning ADC with 2 Analog Input Channels
Normally, one of the channels will be used as the main channel with the second channel used as an auxiliary input to periodically measure a second voltage. The part can be operated from a single supply (by tying the VSS pin to AGND) provided that the input signals on the low level analog input are more positive than -30 mV. By taking the VSS pin negative, the part can convert signals down to -VREF on this low level input. This low level input, as well as the reference input, features differential input capability.
The AD7712 is ideal for use in smart, microcontroller-based systems. Input channel selection, gain settings and signal polarity can be configured in software using the bidirectional serial port. The AD7712 also contains self-calibration, system calibration and background calibration options and also allows the user to read and to write the on-chip calibration registers.
CMOS construction ensures low power dissipation and a hardware programmable power-down mode reduces the standby power consumption to only 100 µW typical. The part is available in a 24-pin, 0.3 inch wide, plastic and hermetic dual-in-line package (DIP) as well as a 24-lead small outline (SOIC) package.
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
This converter utilizes sigma-delta techniques to offer 16-bit accuracy (0.0015% FSR) and no missing codes to 24-bits. It contains a two-channel programmable gain front end, a programmable low-pass digital filter and a bidirectional serial interface. One of the analog inputs and the reference input are differential and the part can accept inputs as low as 20 mV full-scale on this differential analog input. The second analog input contains an input attenuation circuit and can accept inputs up to ±10V. The part features a self-calibration mode, which removes internal offset and gain errors, a system calibration mode, which removes external circuit offset and gain errors, and a background calibration mode which automatically removes internal offset and gain errors. In addition, its flexible serial interface allows the AD7712 to connect directly to Digital Signal Processors (ADSP-2101, TMS320C25, etc.) and Microcontrollers (8XC51, 68HC11, etc.). Full data on the AD7712 is available in the AD7712 data sheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the Evaluation Board.
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