AD7854L

a FEATURES Specified for VDD of 3 V to 5.5 V Read-Only Operation AD7854–200 kSPS; AD7854L–100 kSPS System and Self-Calibration Low Power Normal Operation AD7854: 15 mW (VDD = 3 V) AD7854L: 5.5 mW (V DD = 3 V) Automatic Power-Down After Conversion (25 ␮ W) AD7854: 1.3 mW 10 kSPS AD7854L: 650 ␮W 10 kSPS Flexible Parallel Interface 12-Bit Parallel/8-Bit Parallel (AD7854) 28-Lead DIP, SOIC and SSOP Packages (AD7854) APPLICATIONS Battery-Powered Systems (Personal Digital Assistants, Medical Instruments, Mobile Communications) Pen Computers Instrumentation and Control Systems High Speed Modems 3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs AD7854/AD7854L* FUNCTIONAL BLOCK DIAGRAM AVDD AGND AIN(+) T/H AIN(–) 2.5V REFERENCE REFIN/ REFOUT COMP BUF DGND CREF1 CHARGE REDISTRIBUTION DAC CLKIN CREF2 CALIBRATION MEMORY AND CONTROLLER SAR + ADC CONTROL CONVST BUSY DVDD AD7854/AD7854L PARALLEL INTERFACE/CONTROL REGISTER DB11–DB0 CS RD WR HBEN GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7854/AD7854L is a high speed, low power, 12-bit ADC that operates from a single 3 V or 5 V power supply, the AD7854 being optimized for speed and the AD7854L for low power. 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 AD7854 is capable of 200 k...