Datasheet AD7854, AD7854L (Analog Devices)

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3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs AD7854/AD7854L FUNCTIONAL BLOCK DIAGRAM FEATURES Specified for V AV DD of 3 V to 5.5 V DD AGND Read-Only Operation AD7854–200 kSPS; AD7854L–100 kSPS AIN(+) AD7854/AD7854L T/H System and Self-Calibration AIN(–) Low Power 2.5V DVDD Normal Operation REFERENCE AD7854: 15 mW (VDD = 3 V) COMP REFIN/ AD7854L: 5.5 mW (VDD = 3 V) REF BUF OUT Automatic Power-Down After Conversion (25
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W) DGND AD7854: 1.3 mW 10 kSPS CREF1 CHARGE AD7854L: 650
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W 10 kSPS REDISTRIBUTION DAC Flexible Parallel Interface CLKIN 12-Bit Parallel/8-Bit Parallel (AD7854) SAR + ADC 28-Lead DIP, SOIC and SSOP Packages (AD7854) C CONVST REF2 CONTROL CALIBRATION BUSY MEMORY APPLICATIONS AND CONTROLLER Battery-Powered Systems (Personal Digital Assistants, Medical Instruments, Mobile Communications) Pen Computers PARALLEL INTERFACE/CONTROL REGISTER Instrumentation and Control Systems High Speed Modems DB11–DB0 CS RD WR HBEN GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD7854/AD7854L is a high speed, low power, 12-bit ADC 1. Operation with either 3 V or 5 V power supplies. that operates from a single 3 V or 5 V power supply, the 2. Flexible power management options including automatic AD7854 being optimized for speed and the AD7854L for low power-down after conversion. By using the power manage- power. The ADC powers up with a set of default conditions at ment options a superior power performance at slower which time it can be operated as a read-only ADC. The ADC throughput rates can be achieved: contains self-calibration and system calibration options to en- AD7854: 1 mW typ @ 10 kSPS sure accurate operation over time and temperature and has a AD7854L: 1 mW typ @ 20 kSPS number of power-down options for low power applications. 3. Operates with reference voltages from 1.2 V to AVDD. The AD7854 is capable of 200 kHz throughput rate while the 4. Analog input ranges from 0 V to AVDD. AD7854L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo- 5. Self-calibration and system calibration. differential sampling scheme. The AD7854 and AD7854L input 6. Versatile parallel I/O port. voltage range is 0 to VREF (unipolar) and –VREF/2 to +VREF/2, 7. Lower power version AD7854L. centered at VREF/2 (bipolar). The coding is straight binary in unipolar mode and twos complement in bipolar mode. Input signal range is to the supply and the part is capable of convert- ing full-power signals to 100 kHz. CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 µW in power-down mode. The part is available in 28-lead, 0.6 inch wide dual-in-line pack- age (DIP), 28-lead small outline (SOIC) and 28-lead small shrink outline (SSOP) packages. See Page 27 for data sheet index. REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties
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