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a FEATURES Specified for V DD of 3 V to 5.5 V AD7859–200 kSPS; AD7859L–100 kSPS System and Self-Calibration Low Power Normal Operation AD7859: 15 mW (VDD = 3 V) AD7859L: 5.5 mW (V DD = 3 V) Using Automatic Power-Down After Conversion (25 ␮W) AD7859: 1.3 mW (VDD = 3 V 10 kSPS) AD7859L: 650 ␮W (VDD = 3 V 10 kSPS) Flexible Parallel Interface: 16-Bit Parallel/8-Bit Parallel 44-Pin PQFP and PLCC Packages 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 8-Channel, 12-Bit Sampling ADCs AD7859/AD7859L* FUNCTIONAL BLOCK DIAGRAM AVDD

AGND

AD7859/AD7859L

AIN1 I/P MUX

T/H DVDD

AIN8 2.5V REFERENCE COMP REFIN/ REFOUT

CREF1

BUF DGND

CHARGE REDISTRIBUTION DAC CLKIN

CREF2

SAR + ADC CONTROL

CALIBRATION MEMORY AND CONTROLLER

CONVST BUSY SLEEP

CAL

PARALLEL INTERFACE/CONTROL REGISTER

GENERAL DESCRIPTION

The AD7859/AD7859L are high speed, low power, 8-channel, 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 and system calibration options to ensure accurate operation over time and temperature and have a number of power-down options for low power applications. The AD7859 is capable of 200 kHz throughput rate while the AD7859L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudodifferential sampling scheme. The AD7859 and AD7859L input voltage range is 0 to VREF (unipolar) and –VREF/2 to +VREF/2 about VREF/2 (bipolar) with both straight binary and 2s complement output coding respectively. Input signal range is to the supply and the part is capable of converting 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 44-pin, plastic quad flatpack package (PQFP) and plastic lead chip carrier (PLCC).

DB15 – DB0

RD

CS

WR

W/B

PRODUCT HIGHLIGHTS

1. Operation with either 3 V or 5 V power supplies. 2. Flexible power management options including automatic power-down after conversion. 3. By using the power management options a superior power performance at slower throughput rates can be achieved. AD7859: 1 mW typ @ 10 kSPS AD7859L: 1 mW typ @ 20 kSPS 4. Operates with reference voltages from 1.2 V to the supply. 5. Analog input ranges from 0 V to VDD. 6. Self and system calibration. 7. Versatile parallel I/O port. 8. Lower power version AD7859L.

  • Patent pending. See page 28 for data sheet index.

REV. A 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

© Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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