AD7861

a 11-Bit Resolution Simultaneous Sampling A/D Converter AD7861 FUNCTIONAL BLOCK DIAGRAM REF IN REF OUT 2.5V REFERENCE BUSY A0 A1 12 OUTPUT REGISTERS D0 D11 RD CS CLKIN SGND AGND DGND VDD FEATURES 11-Bit Resolution Analog-to-Digital Converter Seven Single-Ended Analog Inputs Four Input Channels Simultaneously Sampled Expansion with 4 Multiplexed Inputs Internal 2.5 V Reference 3.2 ␮s Conversion Time per Channel User Definable Channel Sequencing Single Supply +5 V Operation Double Buffered Register Outputs 6.25 MHz to 12.5 MHz Operating Clock Range APPLICATIONS Motor Control 3-Phase Power Measurement Cellular Phones Data Acquisition GENERAL DESCRIPTION VIN1 VIN2 VIN3 SHA 11-BIT ADC AUX0 AUX1 AUX2 AUX3 S0 S1 4-1 MUX AD7861 CONVST RESET M0 M1 The AD7861 is a multichannel simultaneous sampling A/D Converter (ADC) configured for the acquisition of voltage inputs in a motor control solution or three-phase power system. The AD7861 combined with Analog Devices’ 16-bit fixedpoint digital signal processor (DSP) provides a low cost 16-bit fixed-point microcontroller solution. The input stage has been designed to accommodate the types of signals frequently found in motor drives. The VIN1, VIN2, and VIN3 channels are simultaneously sampled inputs suitable for stator current acquisition. The AUX0–AUX3 channels are multiplexed and are suitable for slower moving inputs such as temperature and bus voltage of the diode rectifier output in a motor control application. PRODUCT HIGHLI...