Datasheet AD7859, AD7859L (Analog Devices)

3 V to 5 V Single Supply, 200 kSPS
a
8-Channel, 12-Bit Sampling ADCs AD7859/AD7859L FEATURES FUNCTIONAL BLOCK DIAGRAM Specified for VDD of 3 V to 5.5 V AVDD AGND AD7859–200 kSPS; AD7859L–100 kSPS System and Self-Calibration Low Power AIN1 AD7859/AD7859L I/P Normal Operation T/H MUX DV AD7859: 15 mW (VDD = 3 V) AIN8 DD AD7859L: 5.5 mW (VDD = 3 V) 2.5V Using Automatic Power-Down After Conversion (25
m
W) REFERENCE COMP AD7859: 1.3 mW (VDD = 3 V 10 kSPS) REFIN/ AD7859L: 650
m
W (VDD = 3 V 10 kSPS) REF BUF OUT DGND Flexible Parallel Interface: 16-Bit Parallel/8-Bit Parallel CHARGE 44-Pin PQFP and PLCC Packages C REDISTRIBUTION REF1 DAC APPLICATIONS CLKIN Battery-Powered Systems (Personal Digital Assistants, CREF2 SAR + ADC CONVST Medical Instruments, Mobile Communications) CALIBRATION MEMORY CONTROL BUSY AND Pen Computers CONTROLLER SLEEP Instrumentation and Control Systems CAL High Speed Modems PARALLEL INTERFACE/CONTROL REGISTER GENERAL DESCRIPTION
The AD7859/AD7859L are high speed, low power, 8-channel,
DB15 – DB0 RD CS WR W/B
12-bit ADCs which operate from a single 3 V or 5 V power supply, the AD7859 being optimized for speed and the AD7859L for low power. The ADC contains self-calibration
PRODUCT HIGHLIGHTS
and system calibration options to ensure accurate operation over 1. Operation with either 3 V or 5 V power supplies. time and temperature and have a number of power-down 2. Flexible power management options including automatic options for low power applications. power-down after conversion. The AD7859 is capable of 200 kHz throughput rate while the 3. By using the power management options a superior power AD7859L is capable of 100 kHz throughput rate. The input performance at slower throughput rates can be achieved. track-and-hold acquires a signal in 500 ns and features a pseudo- AD7859: 1 mW typ @ 10 kSPS differential sampling scheme. The AD7859 and AD7859L input AD7859L: 1 mW typ @ 20 kSPS voltage range is 0 to VREF (unipolar) and –VREF/2 to +VREF/2 4. Operates with reference voltages from 1.2 V to the supply. about VREF/2 (bipolar) with both straight binary and 2s comple- ment output coding respectively. Input signal range is to the 5. Analog input ranges from 0 V to VDD. supply and the part is capable of converting full-power signals to 6. Self and system calibration. 100 kHz. 7. Versatile parallel I/O port. CMOS construction ensures low power dissipation of typically 8. Lower power version AD7859L. 5.4 mW for normal operation and 3.6 µW in power-down mode. The part is available in 44-pin, plastic quad flatpack package (PQFP) and plastic lead chip carrier (PLCC).
See page 28 for data sheet index.
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