16-Bit 8/10-Channel, Low Voltage, Low Power, Sigma Delta ADC

The AD7708 AD7718 are complete Analog front-ends for low frequency measurement applications. The AD7718 contains a 24-bit ?? ADC with PGA and CAN be configured as 4/5 fully- differential input channels or 8/10 pseudo-differential input channels. Two pins on the device are configurable as Analog inputs or reference inputs. The AD7708 is a 16-bit version of the AD7718. Input signal ranges from 20 mV to 2.56 V CAN be directly converted using these ADCs Signals CAN be converted directly from a transducer without the need for Signal Conditioning The device operates from a 32 kHz crystal with an on-board PLL generating the required internal operating frequency. The output data rate from the part is software programmable. The peak-to- peak resolution from the part varies with the programmed gain and output data rate. The part operates from a single 3 V or 5 V supply. When operating from 3 V supplies, the power dissipation for the part is 3.84 mW typ. Both parts are pin-for-pin compatible allowing an upgradable path from 16 to 24 bits without the need for hardware modifica- tions. The AD7708 AD7718 are housed in 28-lead SOIC and TSSOP packages. By Analog Devices, Inc.