Document
ADS7817
OAPDSA7681578
ADS7817
SBAS066A – MAY 2001
12-Bit Differential Input Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
FEATURES
q BIPOLAR INPUT RANGE q TRUE DIFFERENTIAL INPUT q 200kHz SAMPLING RATE q MICRO POWER: 2.3mW at 200kHz q POWER DOWN: 3µA Max q AVAILABLE IN MSOP-8 PACKAGE q SERIAL INTERFACE q AC COMMON-MODE REJECTION
APPLICATIONS
q TRANSDUCER INTERFACE q BATTERY OPERATED SYSTEMS q REMOTE DATA ACQUISITION q ISOLATED DATA ACQUISITION q AC MOTOR CONTROL
DESCRIPTION
The ADS7817 is a 12-bit, 200kHz sampling Analog-toDigital (A/D) converter that features a high impedance fully differential analog input. The reference voltage can be varied from 100mV to 2.5V, with a corresponding inputreferred resolution between 49µV and 1.22mV.
The differential input, low power, automatic power down, and small size make the ADS7817 ideal for direct connection to transducers in battery operated systems, remote data acquisition, or multi-channel applications. The ADS7817 is available in a plastic mini-DIP-8, an SO-8, or an MSOP-8 package.
VREF
+In –In
S/H Amp
SAR
CDAC
Comparator
Control
Serial Interface
DOUT
DCLOCK CS/SHDN
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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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Copyright © 1997, Texas Instruments Incorporated
ABSOLUTE MAXIMUM RATINGS(1)
+VCC ..................................................................................................... +6V Analog Input ........................................................... –0.3V to (+VCC + 0.3V) Logic Input ............................................................. –0.3V to (+VCC + 0.3V) Case Temperature ......................................................................... +100°C Junction Temperature .................................................................... +150°C Storage Temperature ..................................................................... +125°C External Reference Voltage .............................................................. +5.5V
NOTE: (1) Stresses above these ratings may permanently damage the device.
PIN CONFIGURATION
VREF 1 +In 2 –In 3
GND 4
ADS7817
PDIP-8, SOIC-8, MSOP-8
8 +VCC 7 DCLOCK 6 DOUT 5 CS/SHDN
ELECTROSTATIC DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small .