7851

a FEATURES Single 5 V Supply 333 kSPS Throughput Rate/؎2 LSB DNL—A Grade 285 kSPS Throughput Rate/؎1 LSB DNL—K Grade A and K Grades Guaranteed to 125؇C/238 kSPS Throughput Rate Pseudo-Differential Input with Two Input Ranges System and Self-Calibration with Autocalibration on Power-Up Read/Write Capability of Calibration Data Low Power: 60 mW Typ Power-Down Mode: 5 ␮W Typ Power Consumption Flexible Serial Interface: 8051/SPI®/QSPI™/␮P Compatible 24-Lead PDIP, SOIC, and SSOP Packages APPLICATIONS Digital Signal Processing Speech Recognition and Synthesis Spectrum Analysis DSP Servo Control Instrumentation and Control Systems High Speed Modems Automotive AIN (+) AIN (–) REFIN/ REFOUT 14-Bit 333 kSPS Serial A/D Converter AD7851 FUNCTIONAL BLOCK DIAGRAM AVDD AGND AGND T/H 4.096V REFERENCE AD7851 DVDD DGND BUF COMP AMODE CREF1 CREF2 CAL CHARGE REDISTRIBUTION DAC CALIBRATION MEMORY AND CONTROLLER SAR + ADC CONTROL CLKIN CONVST BUSY SLEEP SERIAL INTERFACE/CONTROL REGISTER SM1 SM2 SYNC DIN DOUT SCLK POLARITY GENERAL DESCRIPTION The AD7851 is a high speed, 14-bit ADC that operates from a single 5 V power supply. The ADC powers up with a set of default conditions at which time it can be operated as a read-only ADC. The ADC contains self-calibration and system calibration options to ensure accurate operation over time and temperature and has a number of power-down options for low power applications. The AD7851 is capable of a 333 kHz throughput rate. The input track-a...