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Электронный компонент: ADS1217IPFBR

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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+
V
REF
X
IN
X
OUT
D7
BUFEN
...
D0
DGND
DV
DD
D
IN
SCLK
POL
D
OUT
CS
DRDY
PDWN
DYSNC
RESET
MUX
A
IN
0
A
IN
1
A
IN
2
A
IN
3
A
IN
4
A
IN
5
A
IN
6
A
IN
7
A
INCOM
IDAC1
Controller
Program-
mable
Digital
Filter
8-Bit
IDAC
IDAC2
8-Bit
IDAC
Offset
DAC
ADS1217
SBAS260B MAY 2002 REVISED OCTOBER 2004
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 2002-2004, 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.
ADS1217
2
SBAS260B
www.ti.com
ELECTRICAL CHARACTERISTICS: AV
DD
= 5V
All specifications at 40
C to +85
C, AV
DD
= +5V, DV
DD
= +2.7V to 5.25V, f
MOD
= 19.2kHz, PGA = 1, Buffer ON, R
DAC
= 150k
, f
DATA
= 10Hz, and V
REF
= +2.5V,
unless otherwise specified.
AV
DD
to AGND ...................................................................... 0.3V to +6V
DV
DD
to DGND ...................................................................... 0.3V to +6V
Input Current ............................................................... 100mA, Momentary
Input Current ................................................................. 10mA, Continuous
A
IN
................................................................... GND 0.5V to AV
DD
+ 0.5V
AV
DD
to DV
DD
........................................................................... 6V to +6V
AGND to DGND ................................................................. 0.3V to +0.3V
Digital Input Voltage to GND .................................... 0.3V to DV
DD
+ 0.3V
Digital Output Voltage to GND ................................. 0.3V to DV
DD
+ 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.
ABSOLUTE MAXIMUM RATINGS
(1)
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.
SPECIFIED
PACKAGE
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
PACKAGE-LEAD
DESIGNATOR
RANGE
MARKING
NUMBER
MEDIA, QUANTITY
ADS1217
TQFP-48
PFB
40
C to +85
C
ADS1217
ADS1217IPFBT
Tape and Reel, 250
"
"
"
"
"
ADS1217IPFBR
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.
PACKAGE/ORDERING INFORMATION
(1)
ADS1217
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT (A
IN
0 A
IN
7, A
INCOM
)
Full-Scale Input Voltage
(A
IN+
) (A
IN
)
2V
REF
/PGA
V
Analog Input Voltage
Buffer OFF
AGND 0.1
AV
DD
+ 0.1
V
Buffer ON
AGND + 0.05
AV
DD
1.5
V
Differential Input Impedance
Buffer OFF
10/PGA
M
Input Current
Buffer ON
0.5
nA
Bandwidth
Fast Settling Filter
3dB
0.469f
DATA
Hz
Sinc
2
Filter
3dB
0.318f
DATA
Hz
Sinc
3
Filter
3dB
0.262f
DATA
Hz
Programmable Gain Amplifier
User Selectable Gain Ranges
1
128
Burnout Current Sources
2
A
OFFSET DAC
Offset DAC Range
V
REF
/(PGA)
V
Offset DAC Monotonicity
8
Bits
Offset DAC Gain Error
1
%
Offset DAC Gain Error Drift
1
ppm/
C
SYSTEM PERFORMANCE
Resolution
24
Bits
No Missing Codes
Sinc
3
Filter
24
Bits
Integral Nonlinearity
End Point Fit, Differential Input,
0.0003
0.0012
% of FSR
(1)
Buffer Off
Offset Error
Before Calibration
7.5
ppm of FSR
Offset Drift
0.02
ppm of FSR/
C
Gain Error
Before Calibration
0.005
%
Gain Error Drift
0.5
ppm/
C
Common-Mode Rejection
at DC
100
dB
f
CM
= 60Hz, f
DATA
= 10Hz
130
dB
f
CM
= 50Hz, f
DATA
= 50Hz
120
dB
f
CM
= 60Hz, f
DATA
= 60Hz
120
dB
Normal-Mode Rejection
f
SIG
= 50Hz, f
DATA
= 50Hz
100
dB
f
SIG
= 60Hz, f
DATA
= 60Hz
100
dB
Output Noise
See Typical Characteristics
Power-Supply Rejection
at DC, dB = 20log(
V
OUT
/
V
DD
)
(2)
80
95
dB
NOTES: (1) FSR is Full-Scale Range. (2)
V
OUT
is change in digital result. (3) 12pF switched capacitor at f
SAMP
clock frequency.
ADS1217
SBAS260B
3
www.ti.com
ELECTRICAL CHARACTERISTICS: AV
DD
= 5V
(Cont.)
All specifications at 40
C to +85
C, AV
DD
= +5V, DV
DD
= +2.7V to 5.25V, f
MOD
= 19.2kHz, PGA = 1, Buffer ON, R
DAC
= 150k
, f
DATA
= 10Hz, and V
REF
= +2.5V,
unless otherwise specified.
ADS1217
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VOLTAGE REFERENCE INPUT
Reference Input (V
REF
)
V
REF
(V
REF+
) (V
REF
)
0.1
2.5
2.6
V
Negative Reference Input (V
REF
)
AGND 0.1
(V
REF+
) 0.1
V
Positive Reference Input (V
REF+
)
(V
REF
) + 0.1
AV
DD
+ 0.1
V
Common-Mode Rejection
at DC
120
dB
Common-Mode Rejection
f
VREFCM
= 60Hz, f
DATA
= 60Hz
120
dB
Bias Current
(3)
V
REF
= 2.5V, PGA = 1
1.3
A
ON-CHIP VOLTAGE REFERENCE
Output Voltage
REF HI = 1
2.4
2.5
2.6
V
REF HI = 0
1.25
V
Short-Circuit Current Source
8
mA
Short-Circuit Current Sink
50
A
Drift
15
ppm/
C
Noise
V
RCAP
= 0.1
F, BW = 0.1Hz to 100Hz
10
Vrms
Output Impedance
Sourcing 100
A
3
Startup Time
5
ms
IDAC
Full-Scale Output Current
R
DAC
= 150k
, Range = 1
0.5
mA
R
DAC
= 150k
, Range = 2
1
mA
R
DAC
= 150k
, Range = 3
2
mA
R
DAC
= 15k
, Range = 3
20
mA
Current Setting Resistance (R
DAC
)
10
k
Monotonicity
R
DAC
= 150k
8
Bits
Compliance Voltage
0
AV
DD
1
V
Output Impedance
See Typical Characteristics
PSRR
V
OUT
= AV
DD
/2, Code > 16
400
ppm/V
Gain Error
Individual IDAC
5
%
Gain Error Drift
Individual IDAC
75
ppm/
C
Gain Error Mismatch
Between IDACs, Same Range and Code
0.25
%
Gain Error Mismatch Drift
Between IDACs, Same Range and Code
15
ppm/
C
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage
AV
DD
4.75
5.25
V
Analog Current (I
ADC
+ I
VREF
+ I
IDAC)
PDWN = 0, or SLEEP
1
nA
A/D Converter Current (I
ADC
)
PGA = 1, Buffer OFF
175
275
A
PGA = 128, Buffer OFF
500
750
A
PGA = 1, Buffer ON
250
350
A
PGA = 128, Buffer ON
900
1375
A
V
REF
Current (I
VREF
)
250
375
A
I
IDAC
Current (I
IDAC
)
Excludes Load Current
480
675
A
Digital Current
Normal Mode, DV
DD
= 5V
180
275
A
SLEEP Mode, DV
DD
= 5V
150
A
Read Data Continuous Mode, DV
DD
= 5V
230
A
PDWN = 0
1
nA
Power Dissipation
PGA = 1, Buffer OFF, REFEN = 0,
1.8
2.8
mW
IDACs OFF, DV
DD
= 5V
NOTES: (1) FSR is Full-Scale Range. (2)
V
OUT
is change in digital result. (3) 12pF switched capacitor at f
SAMP
clock frequency.
ADS1217
4
SBAS260B
www.ti.com
ELECTRICAL CHARACTERISTICS: AV
DD
= 3V
All specifications at 40
C to +85
C, AV
DD
= +3V, DV
DD
= +2.7V to 5.25V, f
MOD
= 19.2kHz, PGA = 1, Buffer ON, R
DAC
= 75k
, f
DATA
= 10Hz, and V
REF
= +1.25V,
unless otherwise specified.
ADS1217
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT (A
IN
0 A
IN
7, A
INCOM
)
Full-Scale Input Voltage
(A
IN+
) (A
IN
)
2V
REF
/PGA
V
Analog Input Range
Buffer OFF
AGND 0.1
AV
DD
+ 0.1
V
Buffer ON
AGND + 0.05
AV
DD
1.5
V
Input Impedance
Buffer OFF
10/ PGA
M
Input Current
Buffer ON
0.5
nA
Bandwidth
Fast Settling Filter
3dB
0.469f
DATA
Hz
Sinc
2
Filter
3dB
0.318f
DATA
Hz
Sinc
3
Filter
3dB
0.262f
DATA
Hz
Programmable Gain Amplifier
User Selectable Gain Ranges
1
128
Burnout Current Sources
2
A
OFFSET DAC
Offset DAC Range
V
REF
/(PGA)
V
Offset DAC Monotonicity
8
Bits
Offset DAC Gain Error
1
%
Offset DAC Gain Error Drift
2
ppm/
C
SYSTEM PERFORMANCE
Resolution
24
Bits
No Missing Codes
Sinc
3
Filter
24
Bits
Integral Nonlinearity
End Point Fit, Differential Input,
0.0003
0.0012
% of FSR
(1)
Buffer Off, T = 25
C
Offset Error
Before Calibration
15
ppm of FSR
Offset Drift
0.04
ppm of FSR/
C
Gain Error
Before Calibration
0.010
%
Gain Error Drift
1.0
ppm/
C
Common-Mode Rejection
at DC
100
dB
f
CM
= 60Hz, f
DATA
= 10Hz
130
dB
f
CM
= 50Hz, f
DATA
= 50Hz
120
dB
f
CM
= 60Hz, f
DATA
= 60Hz
120
dB
Normal-Mode Rejection
f
SIG
= 50Hz, f
DATA
= 50Hz
100
dB
f
SIG
= 60Hz, f
DATA
= 60Hz
100
dB
Output Noise
See Typical Characteristics
Power-Supply Rejection
at DC, dB = 20 log(
V
OUT
/
V
DD
)
(2)
75
90
dB
VOLTAGE REFERENCE INPUT
Reference Input (V
REF
)
V
REF
(V
REF+
) (V
REF
)
0.1
1.25
1.3
V
Negative Reference Input (V
REF
)
AGND 0.1
(V
REF+
) 0.1
V
Positive Reference Input (V
REF+
)
(V
REF
) + 0.1
AV
DD
+ 0.1
V
Common-Mode Rejection
at DC
120
dB
Common-Mode Rejection
f
VREFCM
= 60Hz, f
DATA
= 60Hz
120
dB
Bias Current
(3)
V
REF
= 1.25V
0.65
A
ON-CHIP VOLTAGE REFERENCE
Output Voltage
REF HI = 0
1.2
1.25
1.3
V
Short-Circuit Current Source
3
mA
Short-Circuit Current Sink
50
A
Drift
15
ppm/
C
Noise
V
RCAP
= 0.1
F, BW = 0.1Hz to 100Hz
10
Vrms
Output Impedance
Sourcing 100
A
3
Startup Time
5
ms
IDAC
Full-Scale Output Current
R
DAC
= 75k
, Range = 1
0.5
mA
R
DAC
= 75k
, Range = 2
1
mA
R
DAC
= 75k
, Range = 3
2
mA
R
DAC
= 15k
, Range = 3
20
mA
Current Setting Resistance (R
DAC
)
10
k
Monotonicity
R
DAC
= 75k
8
Bits
Compliance Voltage
0
AV
DD
1
V
Output Impedance
See Typical Characteristics
PSRR
V
OUT
= AV
DD
/ 2, Code > 16
600
ppm/V
Gain Error
Individual IDAC
5
%
Gain Error Drift
Individual IDAC
75
ppm/
C
Gain Error Mismatch
Between IDACs, Same Range and Code
0.25
%
Gain Error Mismatch Drift
Between IDACs, Same Range and Code
15
ppm/
C
NOTES: (1) FSR is Full-Scale Range. (2)
V
OUT
is change in digital result. (3) 12pF switched capacitor at f
SAMP
clock frequency.
ADS1217
SBAS260B
5
www.ti.com
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage
AV
DD
2.7
3.3
V
Analog Current (I
ADC
+ I
VREF
+ I
IDAC
)
PDWN = 0, or SLEEP
1
nA
A/D Converter Current (I
ADC
)
PGA = 1, Buffer OFF
160
250
A
PGA = 128, Buffer OFF
450
700
A
PGA = 1, Buffer ON
230
325
A
PGA = 128, Buffer ON
850
1325
A
V
REF
Current (I
VREF
)
250
375
A
I
IDAC
Current (I
IDAC
)
Excludes Load Current
480
675
A
Digital Current
Normal Mode, DV
DD
= 3V
90
200
A
SLEEP Mode, DV
DD
= 3V
75
A
Read Data Continuous Mode, DV
DD
= 3V
113
A
PDWN = 0
1
nA
Power Dissipation
PGA = 1, Buffer OFF, REFEN = 0,
0.8
1.4
mW
IDACs OFF, DV
DD
= 3V
NOTES: (1) FSR is Full-Scale Range. (2)
V
OUT
is change in digital result. (3) 12pF switched capacitor at f
SAMP
clock frequency.
ADS1217
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ELECTRICAL CHARACTERISTICS: AV
DD
= 3V
(Cont.)
All specifications at 40
C to +85
C, AV
DD
= +3V, DV
DD
= +2.7V to 5.25V, f
MOD
= 19.2kHz, PGA = 1, Buffer ON, R
DAC
= 75k
, f
DATA
= 10Hz, and V
REF
= +1.25V,
unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INPUT/OUTPUT
Logic Level
V
IH
0.8
DV
DD
DV
DD
V
V
IL
(1)
DGND
0.2
DV
DD
V
V
OH
I
OH
= 1mA
DV
DD
0.4
V
V
OL
I
OL
= 1mA
DGND
DGND + 0.4
V
Input Leakage: I
IN
0 < V
I
< DV
DD
10
10
A
CLOCK RATES
Master Clock Rate: f
OSC
1
8
MHz
Master Clock Period: t
OSC
1/f
OSC
125
1000
ns
NOTE: (1) Maximum V
IL
for X
IN
is DGND + 0.05V.
ELECTRICAL CHARACTERISTICS: Digital
All specifications at 40
C to +85
C, and DV
DD
= +2.7V to 5.25V.