ADS1217 CONVERTER Datasheet

ADS1217 Datasheet, PDF, Equivalent


Part Number

ADS1217

Description

24-Bit ANALOG-TO-DIGITAL CONVERTER

Manufacture

Burr-Brown Corporation

Total Page 30 Pages
Datasheet
Download ADS1217 Datasheet


ADS1217
ADS1217ADS1217
SBAS260C – MAY 2002 – REVISED FEBRUARY 2007
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: ±2VREF
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, VDD = 3V
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
q LIQUID/GAS CHROMATOGRAPHY
q BLOOD ANALYSIS
q SMART TRANSMITTERS
q PORTABLE INSTRUMENTATION
q WEIGH SCALES
q PRESSURE TRANSDUCERS
IDAC2
IDAC1
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.
AGND AVDD
RDAC
VREFOUT
VRCAP
VREF+ VREF–
XIN XOUT
8-Bit
IDAC
8-Bit
IDAC
Voltage
Reference
Clock Generator
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AINCOM
MUX
BUF
Offset
DAC
+ PGA
2nd-Order
Modulator
Program-
mable
Digital
Filter
Controller
Registers
RAM
PDWN
DYSNC
RESET
BUFEN
Digital I/O
Interface
Serial Interface
DVDD DGND D0 ... D7
POL
SCLK
DIN
DOUT
CS
DRDY
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.
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.
www.ti.com
Copyright © 2002-2007, Texas Instruments Incorporated

ADS1217
ABSOLUTE MAXIMUM RATINGS(1)
AVDD to AGND ...................................................................... –0.3V to +6V
DVDD to DGND ...................................................................... –0.3V to +6V
Input Current ............................................................... 100mA, Momentary
Input Current ................................................................. 10mA, Continuous
AIN ................................................................... GND –0.5V to AVDD + 0.5V
AVDD to DVDD ........................................................................... –6V to +6V
AGND to DGND ................................................................. –0.3V to +0.3V
Digital Input Voltage to GND .................................... –0.3V to DVDD + 0.3V
Digital Output Voltage to GND ................................. –0.3V to DVDD + 0.3V
Maximum Junction Temperature ................................................... +150°C
Operating Temperature Range ......................................... –40°C to +85°C
Storage Temperature Range .......................................... –60°C to +150°C
Lead Temperature (soldering, 10s) .............................................. +300°C
NOTE: (1) Stresses above those listed under Absolute Maximum Ratings may
cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments 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 parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION(1)
PRODUCT
ADS1217
"
PACKAGE-LEAD
TQFP-48
"
PACKAGE
DESIGNATOR
PFB
"
SPECIFIED
TEMPERATURE
RANGE
40°C to +85°C
"
PACKAGE
MARKING
ADS1217
"
ORDERING
NUMBER
ADS1217IPFBT
ADS1217IPFBR
TRANSPORT
MEDIA, QUANTITY
Tape and Reel, 250
Tape and Reel, 2000
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet, or see the TI website at www.ti.com.
ELECTRICAL CHARACTERISTICS: AVDD = 5V
All specifications at –40°C to +85°C, AVDD = +5V, DVDD = +2.7V to 5.25V, fMOD = 19.2kHz, PGA = 1, Buffer ON, RDAC = 150k, fDATA = 10Hz, and VREF = +2.5V,
unless otherwise specified.
ADS1217
PARAMETER
CONDITIONS
MIN TYP
MAX
UNITS
ANALOG INPUT (AIN0 AIN7, AINCOM)
Full-Scale Input Voltage
Analog Input Voltage
Differential Input Impedance
Input Current
Bandwidth
Fast Settling Filter
Sinc2 Filter
Sinc3 Filter
Programmable Gain Amplifier
Burnout Current Sources
(AIN+) (AIN)
Buffer OFF
Buffer ON
Buffer OFF
Buffer ON
3dB
3dB
3dB
User Selectable Gain Ranges
AGND 0.1
AGND + 0.05
1
±2VREF /PGA
10/PGA
0.5
0.469fDATA
0.318fDATA
0.262fDATA
2
AVDD + 0.1
AVDD 1.5
128
OFFSET DAC
Offset DAC Range
Offset DAC Monotonicity
Offset DAC Gain Error
Offset DAC Gain Error Drift
±VREF /(PGA)
8
±1
1
SYSTEM PERFORMANCE
Resolution
No Missing Codes
Integral Nonlinearity
Offset Error
Offset Drift
Gain Error
Gain Error Drift
Common-Mode Rejection
Normal-Mode Rejection
Output Noise
Power-Supply Rejection
Sinc3 Filter
End Point Fit, Differential Input,
Buffer Off
Before Calibration
After Calibration
at DC
fCM = 60Hz, fDATA = 10Hz
fCM = 50Hz, fDATA = 50Hz
fCM = 60Hz, fDATA = 60Hz
fSIG = 50Hz, fDATA = 50Hz
fSIG = 60Hz, fDATA = 60Hz
at DC, dB = 20log(VOUT /VDD)(2)
24
24
0.0003
0.0012
7.5
0.02
0.005
0.5
100
130
120
120
100
100
See Typical Characteristics
80 95
NOTES: (1) FSR is Full-Scale Range. (2) VOUT is change in digital result. (3) 12pF switched capacitor at fSAMP clock frequency.
V
V
V
M
nA
Hz
Hz
Hz
µA
V
Bits
%
ppm/°C
Bits
Bits
% of FSR(1)
ppm of FSR
ppm of FSR/°C
%
ppm/ °C
dB
dB
dB
dB
dB
dB
dB
2 ADS1217
www.ti.com
SBAS260C


Features ADS1217ADS1217 SBAS260C – MAY 2002 REVISED FEBRUARY 2007 8-Channel, 24-B it ANALOG-TO-DIGITAL CONVERTER FEATURE S q 24 BITS NO MISSING CODES q INL: 0.0 012% of FSR (max) q FULL-SCALE INPUT: 2VREF q PGA FROM 1 TO 128 q 22 BITS EF FECTIVE 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 POW ER CONSUMPTION, VDD = 3V APPLICATIONS q INDUSTRIAL PROCESS CONTROL q LIQUID/G AS CHROMATOGRAPHY q BLOOD ANALYSIS q SM ART TRANSMITTERS q PORTABLE INSTRUMENTA TION q WEIGH SCALES q PRESSURE TRANSDUC ERS IDAC2 IDAC1 DESCRIPTION The ADS12 17 is a precision, wide dynamic range, deltasigma, Analog-to-Digital (A/D) con verter with 24-bit resolution operating from 2.7V to 5.25V supplies. The delta -sigma, A/D converter provides up to 24 bits of no missing code performance an d effective resolution of 22 bits. The eight input channels are mult.
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