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PDF ADS1217IPFBT Data sheet ( Hoja de datos )
| Número de pieza | ADS1217IPFBT | |
| Descripción | 8-Channel/ 24-Bit ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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ADS1217
ADS1217
SBAS260B – MAY 2002 – REVISED OCTOBER 2004
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 © 2002-2004, Texas Instruments Incorporated
1 page  
ELECTRICAL CHARACTERISTICS: AVDD = 3V (Cont.)
All specifications at –40°C to +85°C, AVDD = +3V, DVDD = +2.7V to 5.25V, fMOD = 19.2kHz, PGA = 1, Buffer ON, RDAC = 75kΩ, fDATA = 10Hz, and VREF = +1.25V,
unless otherwise specified.
ADS1217
PARAMETER
CONDITIONS
MIN TYP
MAX
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage
Analog Current (IADC + IVREF + IIDAC)
A/D Converter Current (IADC)
VREF Current (IVREF)
IIDAC Current (IIDAC)
AVDD
PDWN = 0, or SLEEP
PGA = 1, Buffer OFF
PGA = 128, Buffer OFF
PGA = 1, Buffer ON
PGA = 128, Buffer ON
Excludes Load Current
2.7 3.3
1
160 250
450 700
230 325
850 1325
250 375
480 675
Digital Current
Power Dissipation
Normal Mode, DVDD = 3V
SLEEP Mode, DVDD = 3V
Read Data Continuous Mode, DVDD = 3V
PDWN = 0
PGA = 1, Buffer OFF, REFEN = 0,
IDACs OFF, DVDD = 3V
90 200
75
113
1
0.8 1.4
NOTES: (1) FSR is Full-Scale Range. (2) ∆VOUT is change in digital result. (3) 12pF switched capacitor at fSAMP clock frequency.
UNITS
V
nA
µA
µA
µA
µA
µA
µA
µA
µA
µA
nA
mW
ELECTRICAL CHARACTERISTICS: Digital
All specifications at –40°C to +85°C, and DVDD = +2.7V to 5.25V.
PARAMETER
INPUT/OUTPUT
Logic Level
VIH
VIL(1)
VOH
VOL
Input Leakage: IIN
CLOCK RATES
Master Clock Rate: fOSC
Master Clock Period: tOSC
NOTE: (1) Maximum VIL for XIN is DGND + 0.05V.
CONDITIONS
IOH = 1mA
IOL = 1mA
0 < VI < DVDD
1/fOSC
MIN
0.8 × DVDD
DGND
DVDD – 0.4
DGND
–10
1
125
TYP
MAX
DVDD
0.2 × DVDD
DGND + 0.4
10
8
1000
UNITS
V
V
V
V
µA
MHz
ns
ADS1217
SBAS260B
www.ti.com
5
5 Page 
TYPICAL CHARACTERISTICS (Cont.)
AVDD = +5V, DVDD = +5V, fOSC = 2.4576MHz, PGA = 1, RDAC = 150kΩ, fDATA = 10Hz, and VREF = +2.5V, unless otherwise specified.
1.00020
1.00016
1.00012
1.00008
1.00004
1.00000
0.99996
0.99992
0.99988
0.99984
0.99980
0.99976
–50
OFFSET DAC: GAIN vs TEMPERATURE
–30 –10 10 30 50
Temperature (°C)
70
90
1.0000
1.000
0.999
0.999
0.998
0
IDAC IOUT vs VOUT
+25°C
+85°C
–40°C
1 234
VDD – VOUT (V)
5
1.010
IDAC NORMALIZED IOUT vs TEMPERATURE
1.005
1.000
0.995
0.990
0.985
–50 –30 –10 10 30 50
Temperature (°C)
70
90
3000
2000
1000
0
–1000
–2000
–3000
–4000
–5000
–6000
–50
IDAC MATCHING vs TEMPERATURE
–30 –10 10 30 50
Temperature (°C)
70
90
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0
IDAC DIFFERENTIAL NONLINEARITY
(Range = 1, RDAC = 150kΩ, VREF = 2.5V)
32 64 96 128 160 192 224 255
IDAC Code
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0
IDAC INTEGRAL NONLINEARITY
(Range = 1, RDAC = 150kΩ, VREF = 2.5V)
32 64 96 128 160 192 224 255
IDAC Code
ADS1217
SBAS260B
www.ti.com
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ADS1217IPFBT.PDF ] | |
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