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Analog Devices - 3 V to 5 V Single Supply/ 200 kSPS 12-Bit Sampling ADCs

Numéro de référence AD7854
Description 3 V to 5 V Single Supply/ 200 kSPS 12-Bit Sampling ADCs
Fabricant Analog Devices 
Logo Analog Devices 





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AD7854 fiche technique
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3 V to 5 V Single Supply, 200 kSPS
12-Bit Sampling ADCs
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 (VDD = 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
AIN(+)
AIN(–)
REFIN/
REFOUT
CREF1
CREF2
AD7854/AD7854L*
FUNCTIONAL BLOCK DIAGRAM
AVDD
AGND
AD7854/AD7854L
T/H
2.5V
REFERENCE
BUF
COMP
CHARGE
REDISTRIBUTION
DAC
CALIBRATION
MEMORY
AND CONTROLLER
SAR + ADC
CONTROL
DVDD
DGND
CLKIN
CONVST
BUSY
PARALLEL INTERFACE/CONTROL REGISTER
DB11–DB0
CS RD WR HBEN
GENERAL DESCRIPTION
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 en-
sure accurate operation over time and temperature and has a
number of power-down options for low power applications.
The AD7854 is capable of 200 kHz throughput rate while the
AD7854L is capable of 100 kHz throughput rate. The input
track-and-hold acquires a signal in 500 ns and features a pseudo-
differential sampling scheme. The AD7854 and AD7854L input
voltage range is 0 to VREF (unipolar) and –VREF/2 to +VREF/2,
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.
PRODUCT HIGHLIGHTS
1. Operation with either 3 V or 5 V power supplies.
2. Flexible power management options including automatic
power-down after conversion. By using the power manage-
ment options a superior power performance at slower
throughput rates can be achieved:
AD7854: 1 mW typ @ 10 kSPS
AD7854L: 1 mW typ @ 20 kSPS
3. Operates with reference voltages from 1.2 V to AVDD.
4. Analog input ranges from 0 V to AVDD.
5. Self-calibration and system calibration.
6. Versatile parallel I/O port.
7. Lower power version AD7854L.
*Patent pending.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000

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