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AD7858LBR Datenblatt(PDF) 1 Page - Analog Devices

Teilenummer AD7858LBR
Bauteilbeschribung  3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

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FUNCTIONAL BLOCK DIAGRAM
SAR AND ADC
CONTROL
CHARGE
REDISTRIBUTION
DAC
BUF
2.5V
REFERENCE
T/H
I/P
MUX
COMP
CALIBRATION
MEMORY AND
CONTROLLER
SERIAL INTERFACE/CONTROL REGISTER
AD7858/
AD7858L
AVDD
AGND
AIN1
AIN8
REFIN/REFOUT
CREF1
CREF2
CAL
SYNC
DIN
DOUT
SCLK
DVDD
DGND
CLKIN
CONVST
BUSY
SLEEP
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.
a
3 V to 5 V Single Supply, 200 kSPS
8-Channel, 12-Bit Sampling ADC
AD7858/AD7858L*
FEATURES
Specified for VDD of 3 V to 5.5 V
AD7858—200 kSPS; AD7858L—100 kSPS
System and Self-Calibration with Autocalibration on
Power-Up
Eight Single-Ended or Four Pseudo-Differential Inputs
Low Power
AD7858: 12 mW (VDD = 3 V)
AD7858L: 4.5 mW (VDD = 3 V)
Automatic Power-Down After Conversion (25
W)
Flexible Serial Interface:
8051/SPI™/QSPI™/ P Compatible
24-Lead DIP, SOIC, and SSOP Packages
APPLICATIONS
Battery-Powered Systems (Personal Digital Assistants,
Medical Instruments, Mobile Communications)
Pen Computers
Instrumentation and Control Systems
High-Speed Modems
GENERAL DESCRIPTION
The AD7858/AD7858L are high-speed, low-power, 12-bit
ADCs that operate from a single 3 V or 5 V power supply, the
AD7858 being optimized for speed and the AD7858L 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 have a
number of power-down options for low-power applications.
The part powers up with a set of default conditions and can
operate as a read-only ADC.
The AD7858 is capable of 200 kHz throughput rate while the
AD7858L 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 AD7858/AD7858L
voltage range is 0 to VREF with straight binary output coding.
Input signal range is to the supply and the part is capable of con-
verting full power signals to 100 kHz.
CMOS construction ensures low power dissipation of typically
4.5 mW for normal operation and 1.15 mW in power-down
mode with a throughput rate of 10 kSPS (VDD = 3 V). The part
is available in 24-lead, 0.3 inch-wide dual-in-line package
(DIP), 24-lead small outline (SOIC), and 24-lead small shrink
outline (SSOP) packages.
*Patent pending.
See page 31 for data sheet index.
SPI and QSPI are trademarks of Motorola, Inc.
PRODUCT HIGHLIGHTS
1. Specified for 3 V and 5 V supplies.
2. Automatic calibration on power-up.
3. Flexible power management options including automatic
power-down after conversion.
4. Operates with reference voltages from 1.2 V to VDD.
5. Analog input range from 0 V to VDD.
6. Eight single-ended or four pseudo-differential input channels.
7. System and self-calibration.
8. Versatile serial I/O port (SPI/QSPI/8051/
µP).
9. Lower power version AD7858L.
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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