AD7851 Datasheet, PDF (1/36 Pages) Analog Devices – 14-Bit 333 kSPS Serial A/D Converter

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FEATURES
Single 5 V Supply
333 kSPS Throughput Rate/؎2 LSB DNL—A Grade
285 kSPS Throughput Rate/؎1 LSB DNL—K Grade
A & K Grades Guaranteed to 125؇C/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-Pin DIP, 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
14-Bit 333 kSPS
Serial A/D Converter
AD7851
AIN (+)
AIN (–)
REF_IN/
REF_OUT
FUNCTIONAL BLOCK DIAGRAM
AV_DD
AGND
AGND
T/H
4.096 V
REFERENCE
BUF
AD7851
COMP
DV_DD
DGND
AMODE
C_REF1
C_REF2
CAL
CHARGE
REDISTRIBUTION
DAC
CALIBRATION
MEMORY
AND CONTROLLER
SAR + ADC
CONTROL
CLKIN
CONVST
BUSY
SLEEP
SERIAL INTERFACE / CONTROL REGISTER
SM1 SM2 SYNC DIN DOUT SCLK POLARITY
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 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 24-
pin, 0.3 inch-wide dual-in-line package (DIP), 24-lead small
outline (SOIC) and 24-lead small shrink outline (SSOP) packages.
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.
*Patent pending.
See Page 35 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.
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