AD7851ARZ Datasheet, PDF (1/36 Pages) Analog Devices – 14-Bit 333 kSPS Serial A/D Converter

a
FEATURES
Single 5 V Supply
333 kSPS Throughput Rate/؎2 LSB DNL—A Grade
285 kSPS Throughput Rate/؎1 LSB DNL—K Grade
A and 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-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
AIN (+)
AIN (–)
REF_IN/
REF_OUT
14-Bit 333 kSPS
Serial A/D Converter
AD7851
FUNCTIONAL BLOCK DIAGRAM
AV_DD
AGND
AGND
T/H
4.096V
REFERENCE
AD7851
DV_DD
DGND
BUF
COMP
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 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
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