AD676

a FEATURES Autocalibrating On-Chip Sample-Hold Function Parallel Output Format 16 Bits No Missing Codes ؎1 LSB INL –97 dB THD 90 dB S/(N+D) 1 MHz Full Power Bandwidth VIN 15 AGND SENSE 14 VREF 16 AGND 13 INPUT BUFFERS 16-Bit 100 kSPS Sampling ADC AD676 FUNCTIONAL BLOCK DIAGRAM ANALOG CHIP 16-BIT DAC COMP CAL DAC LOGIC & TIMING LEVEL TRANSLATORS DIGITAL CHIP SAR CAL 8 SAMPLE 9 MICRO-CODED CONTROLLER PAT GEN ALU RAM L A T C H 7 BUSY 1 6 19 28 BIT 1 – BIT 16 PRODUCT DESCRIPTION CLK 10 The AD676 is a multipurpose 16-bit parallel output analog-todigital converter which utilizes a switched-capacitor/charge redistribution architecture to achieve a 100 kSPS conversion rate (10 µs total conversion time). Overall performance is optimized by digitally correcting internal nonlinearities through on-chip autocalibration. The AD676 circuitry is segmented onto two monolithic chips— a digital control chip fabricated on Analog Devices DSP CMOS process and an analog ADC chip fabricated on our BiMOS II process. Both chips are contained in a single package. The AD676 is specified for ac (or “dynamic”) parameters such as S/(N+D) Ratio, THD and IMD which are important in signal processing applications. In addition, dc parameters are specified which are important in measurement applications. AD676 The AD676 operates from +5 V and ± 12 V supplies and typically consumes 360 mW during conversion. The digital supply (VDD) is separated from the analog supplies (VCC, VEE) for reduced digital cros...