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AD7851ARSZ-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P37
a
AD7851
FUNCTIONAL BLOCK DIAGRAM
AIN (+)
AIN (–)
C
REF1
C
REF2
CAL
AV
DD
AGND
AGND
DV
DD
DGND
AMODE
CLKIN
SLEEP
CONVST
BUSY
SYNC
SM1 SM2 DIN DOUT SCLK POLARITY
CHARGE
REDISTRIBUTION
DAC
COMP
4.096V
REFERENCE
AD7851
BUF
T/H
SAR + ADC
CONTROL
CALIBRATION
MEMORY
AND CONTROLLER
SERIAL INTERFACE/CONTROL REGISTER
REF
IN
/
REF
OUT
14-Bit 333 kSPS
Serial A/D Converter
FEATURES
Single 5 V Supply
333 kSPS Throughput Rate/ⴞ2 LSB DNL—A Grade
285 kSPS Throughput Rate/ⴞ1 LSB DNL—K Grade
A and K Grades Guaranteed to 125ⴗC/238 kSPS
Throughput Rate
Pseudo-Differential Input with Two Input Ranges
System and Self-Calibration with Autocalibration on
Power-Up
Read/Write Capability of Calibration Data
Low Power: 60 mW Typ
Power-Down Mode: 5 ␮W Typ Power Consumption
Flexible Serial Interface: 8051/SPI
®
/QSPI™/␮P Compatible
24-Lead PDIP, SOIC, and SSOP Packages
APPLICATIONS
Digital Signal Processing
Speech Recognition and Synthesis
Spectrum Analysis
DSP Servo Control
Instrumentation and Control Systems
High Speed Modems
Automotive
GENERAL DESCRIPTION
The AD7851 is a high speed, 14-bit ADC that operates from a
single 5 V power supply. 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 ensure accurate operation over time and temperature and has a
number of power-down options for low power applications.
The AD7851 is capable of a 333 kHz throughput rate. The
input track-and-hold acquires a signal in 0.33 µs and features
a pseudo-differential sampling scheme. The AD7851 has the
added advantage of two input voltage ranges (0 V to V
REF
and
–V
REF
/2 to +V
REF
/2 centered about V
REF
/2). Input signal
range is to V
DD
and the part is capable of converting full
power signals to 20 MHz.
CMOS construction ensures low power dissipation (60 mW typ)
with power-down mode (5 µW typ). The part is available in a
24-lead, 0.3 inch-wide PDIP, a 24-lead SOIC, and a 24-lead
SSOP package.
PRODUCT HIGHLIGHTS
1. Single 5 V supply.
2. Operates with reference voltages from 4 V to V
DD
.
3. Analog input ranges from 0 V to V
DD
.
4. System and self-calibration including power-down mode.
5. Versatile serial I/O port.
REV. B
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © 2004 Analog Devices, Inc. All rights reserved.
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
AD7851* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
DOCUMENTATION
Data Sheet
• AD7851: 14-Bit 333 kSPS Serial A/D Converter Data Sheet
REFERENCE MATERIALS
Technical Articles
• MS-2210: Designing Power Supplies for High Speed ADC
DESIGN RESOURCES
• AD7851 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
View all AD7851 EngineerZone Discussions.
SAMPLE AND BUY
Visit the product page to see pricing options.
TECHNICAL SUPPORT
Submit a technical question or find your regional support
number.
DOCUMENT FEEDBACK
Submit feedback for this data sheet.
This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not
trigger a change to either the revision number or the content of the product data sheet. This dynamic page may be frequently modified.
AD7851
–2–
REV. B
TABLE OF CONTENTS
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 1
PRODUCT HIGHLIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . 1
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
TIMING SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 5
TYPICAL TIMING DIAGRAMS . . . . . . . . . . . . . . . . . . . . 6
ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . 7
ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PINOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
TERMINOLOGY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . . 9
AD7851 ON-CHIP REGISTERS . . . . . . . . . . . . . . . . . . . . 10
Addressing the On-Chip Registers . . . . . . . . . . . . . . . . . . 10
Writing/Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CONTROL REGISTER . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
STATUS REGISTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
CALIBRATION REGISTERS . . . . . . . . . . . . . . . . . . . . . . 13
Addressing the Calibration Registers . . . . . . . . . . . . . . . . 13
Writing to/Reading from the Calibration Registers . . . . . . 13
Adjusting the Offset Calibration Register . . . . . . . . . . . . . 14
Adjusting the Gain Calibration Registers . . . . . . . . . . . . . 14
CIRCUIT INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . 15
CONVERTER DETAILS . . . . . . . . . . . . . . . . . . . . . . . . . . 15
TYPICAL CONNECTION DIAGRAM . . . . . . . . . . . . . . 15
ANALOG INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Acquisition Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
DC/AC Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Input Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Transfer Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
REFERENCE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . 18
AD7851 PERFORMANCE CURVES . . . . . . . . . . . . . . . . 18
POWER-DOWN OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . 19
POWER-UP TIMES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Using an External Reference . . . . . . . . . . . . . . . . . . . . . . 20
Using the Internal (On-Chip) Reference . . . . . . . . . . . . . 20
POWER VS. THROUGHPUT RATE . . . . . . . . . . . . . . . . 20
CALIBRATION SECTION . . . . . . . . . . . . . . . . . . . . . . . . 21
Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Automatic Calibration on Power-On . . . . . . . . . . . . . . . . 21
Self-Calibration Description . . . . . . . . . . . . . . . . . . . . . . . 21
Self-Calibration Timing . . . . . . . . . . . . . . . . . . . . . . . . . . 22
System Calibration Description . . . . . . . . . . . . . . . . . . . . 22
System Gain and Offset Interaction . . . . . . . . . . . . . . . . . 23
System Calibration Timing . . . . . . . . . . . . . . . . . . . . . . . 23
SERIAL INTERFACE SUMMARY . . . . . . . . . . . . . . . . . . 24
Resetting the Serial Interface . . . . . . . . . . . . . . . . . . . . . . 24
DETAILED TIMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Mode 1 (2-Wire 8051 Interface) . . . . . . . . . . . . . . . . . . . 25
Mode 2 (3-Wire SPI/QSPI Interface Mode) . . . . . . . . . . . 26
Mode 3 (QSPI Interface Mode) . . . . . . . . . . . . . . . . . . . . 26
Mode 4 and 5 (Self-Clocking Modes) . . . . . . . . . . . . . . . 27
CONFIGURING THE AD7851 . . . . . . . . . . . . . . . . . . . . . 28
AD7851 as a Read-Only ADC . . . . . . . . . . . . . . . . . . . . . 28
Writing to the AD7851 . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Interface Modes 2 and 3 Configuration . . . . . . . . . . . . . . 29
Interface Mode 1 Configuration . . . . . . . . . . . . . . . . . . . . 30
Interface Modes 4 and 5 Configuration . . . . . . . . . . . . . . 30
MICROPROCESSOR INTERFACING . . . . . . . . . . . . . . . 31
AD7851 to 8XC51/PIC17C42 Interface . . . . . . . . . . . . . . . 31
AD7851 to 68HC11/16/L11/PIC16C42 Interface . . . . . . . . 31
AD7851 to ADSP-21xx Interface . . . . . . . . . . . . . . . . . . . . 32
AD7851 to DSP56000/1/2/L002 Interface . . . . . . . . . . . . . 32
AD7851 to TMS320C20/25/5x/LC5x Interface . . . . . . . . . 32
APPLICATIONS HINTS . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Grounding and Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Evaluating the AD7851 Performance . . . . . . . . . . . . . . . . 33
OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . 34
REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P37

AD7851ARSZ-REEL

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Buy AD7851ARSZ-REEL
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 14B 333kSPS Serial Sampling
Lifecycle:
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