ADS7812_15 Datasheet, PDF (1/25 Pages) Texas Instruments – Low-Power, Serial 12-Bit Sampling ANALOG-TO-DIGITAL CONVERTER

ADS7812
ADS7812
ADS7812
SBAS042A – MARCH 1997 – REVISED SEPTEMBER 2003
Low-Power, Serial 12-Bit Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q 20µs max CONVERSION TIME
q SINGLE +5V SUPPLY OPERATION
q PIN-COMPATIBLE WITH 16-BIT ADS7813
q EASY-TO-USE SERIAL INTERFACE
q 0.3" DIP-16 AND SO-16
q ±0.5LSB max INL AND DNL
q 72dB min SINAD
q USES INTERNAL OR EXTERNAL
REFERENCE
q MULTIPLE INPUT RANGES
q 35mW max POWER DISSIPATION
q NO MISSING CODES
q 50µW POWER DOWN MODE
APPLICATIONS
q DATA ACQUISITION SYSTEMS
q INDUSTRIAL CONTROL
q TEST EQUIPMENT
q DIGITAL SIGNAL PROCESSING
R1_IN
R2_IN
R3_IN
BUF
CAP
REF
40kΩ⁽¹⁾
8kΩ⁽¹⁾
20kΩ⁽¹⁾
DESCRIPTION
The ADS7812 is a low-power, single +5V supply, 12-bit
sampling analog-to-digital converter. It contains a complete
12-bit capacitor-based SAR A/D with a sample/hold, clock,
reference, and serial data interface.
The converter can be configured for a variety of input ranges
including ±10V, ±5V, 0V to 10V, and 0.5V to 4.5V. A high
impedance 0.3V to 2.8V input range is also available (input
impedance > 10MΩ). For most input ranges, the input
voltage can swing to +16.5V or –16.5V without damage to
the converter.
A flexible SPI compatible serial interface allows data to be
synchronized to an internal or external clock. The ADS7812
is specified at a 40kHz sampling rate over the –40°C to
+85°C temperature range. It is available in a 0.3" DIP-16 or
an SO-16 package.
BUSY
PWRD
CONV
CS
Successive Approximation Register and Control Logic
Clock
CDAC
Buffer
4kΩ⁽¹⁾
Internal
+2.5V Ref
Comparator
Serial
Data
Out
EXT/INT
DATACLK
DATA
NOTE: (1) Actual value may vary ±30%.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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