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ADS1217IPFBR bảng dữ liệu(PDF) 1 Page - Texas Instruments

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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1217IPFBR bảng dữ liệu(HTML) 1 Page - Texas Instruments

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ADS1
217
8-Channel, 24-Bit
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q 24 BITS NO MISSING CODES
q INL: 0.0012% of FSR (max)
q FULL-SCALE INPUT:
±2V
REF
q PGA FROM 1 TO 128
q 22 BITS EFFECTIVE RESOLUTION
(PGA = 1), 19 BITS (PGA = 128)
q SINGLE CYCLE SETTLING MODE
q PROGRAMMABLE DATA OUTPUT RATES
UP TO 1kHz
q ON-CHIP 1.25V/2.5V REFERENCE
q ON-CHIP CALIBRATION
q SPI COMPATIBLE
q POWER SUPPLY: 2.7V to 5.25V
q < 1mW POWER CONSUMPTION, V
DD = 3V
DESCRIPTION
The ADS1217 is a precision, wide dynamic range, delta-
sigma, Analog-to-Digital (A/D) converter with 24-bit resolu-
tion operating from 2.7V to 5.25V supplies. The delta-sigma,
A/D converter provides up to 24 bits of no missing code
performance and effective resolution of 22 bits.
The eight input channels are multiplexed. Internal buffering
can be selected to provide a very high input impedance for
direct connection to transducers or low-level voltage signals.
Burnout current sources are provided that allow for the
detection of an open or shorted sensor. An 8-bit Digital-to-
Analog Converter (DAC) provides an offset correction with a
range of 50% of the FSR (Full-Scale Range).
The PGA (Programmable Gain Amplifier) provides selectable
gains of 1 to 128 with an effective resolution of 19 bits at a gain
of 128. The A/D conversion is accomplished with a 2nd-order,
delta-sigma modulator and programmable sinc filter. The
reference input is differential and can be used for ratiometric
measurements. The onboard current DACs operate indepen-
dently with the maximum current set by an external resistor.
The serial interface is SPI compatible. Eight bits of digital I/O
are also provided that can be used for input or output. The
ADS1217 is designed for high-resolution measurement appli-
cations in smart transmitters, industrial process control, weigh
scales, chromatography, and portable instrumentation.
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
q LIQUID/GAS CHROMATOGRAPHY
q BLOOD ANALYSIS
q SMART TRANSMITTERS
q PORTABLE INSTRUMENTATION
q WEIGH SCALES
q PRESSURE TRANSDUCERS
BUF
PGA
+
Voltage
Reference
Clock Generator
Registers
Serial Interface
2nd-Order
Modulator
RAM
Digital I/O
Interface
AGND
AV
DD
R
DAC
V
REFOUT
V
RCAP
V
REF+ VREF–
X
IN
X
OUT
D7
BUFEN
...
D0
DGND
DV
DD
D
IN
SCLK
POL
D
OUT
CS
DRDY
PDWN
DYSNC
RESET
MUX
A
IN0
A
IN1
A
IN2
A
IN3
A
IN4
A
IN5
A
IN6
A
IN7
A
INCOM
IDAC1
Controller
Program-
mable
Digital
Filter
8-Bit
IDAC
IDAC2
8-Bit
IDAC
Offset
DAC
ADS1217
SBAS260C – MAY 2002 – REVISED FEBRUARY 2007
www.ti.com
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.
Copyright © 2002-2007, Texas Instruments Incorporated
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.
All trademarks are the property of their respective owners.


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