ELECTRICAL CHARACTERISTICS: AVDD = 3V
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
UNITS
ANALOG INPUT (AIN0 – AIN7, AINCOM
Full-Scale Input Voltage
Analog Input Range
)
(AIN+) – (AIN–
Buffer OFF
Buffer ON
Buffer OFF
Buffer ON
)
±2VREF /PGA
V
V
V
MΩ
nA
AGND – 0.1
AGND + 0.05
AVDD + 0.1
AVDD – 1.5
Input Impedance
Input Current
10/PGA
0.5
Bandwidth
Fast Settling Filter
Sinc2 Filter
Sinc3 Filter
–3dB
–3dB
–3dB
0.469fDATA
0.318fDATA
0.262fDATA
Hz
Hz
Hz
Programmable Gain Amplifier
Burnout Current Sources
User Selectable Gain Ranges
1
8
128
2
µA
OFFSET DAC
Offset DAC Range
Offset DAC Monotonicity
Offset DAC Gain Error
Offset DAC Gain Error Drift
±VREF /(PGA)
V
Bits
%
±1
2
ppm/°C
SYSTEM PERFORMANCE
Resolution
No Missing Codes
Integral Nonlinearity
24
Bits
Bits
% of FSR(1)
Sinc3 Filter
End Point Fit, Differential Input,
Buffer Off, T = 25°C
24
0.0012
0.0003
Offset Error
Offset Drift
Gain Error
Gain Error Drift
Common-Mode Rejection
Before Calibration
15
0.04
0.010
1.0
ppm of FSR
ppm of FSR/°C
Before Calibration
%
ppm/°C
dB
at DC
100
f
CM = 60Hz, fDATA = 10Hz
130
120
120
100
100
dB
dB
dB
dB
fCM = 50Hz, fDATA = 50Hz
fCM = 60Hz, fDATA = 60Hz
Normal-Mode Rejection
f
f
SIG = 50Hz, fDATA = 50Hz
SIG = 60Hz, fDATA = 60Hz
dB
Output Noise
Power-Supply Rejection
See Typical Characteristics
90
(2)
at DC, dB = –20 log(∆VOUT /∆VDD
)
75
dB
VOLTAGE REFERENCE INPUT
Reference Input (VREF
Negative Reference Input (VREF–
Positive Reference Input (VREF+
Common-Mode Rejection
Common-Mode Rejection
Bias Current(3)
)
VREF ≡ (VREF+) – (VREF–
)
0.1
1.25
1.3
V
V
V
dB
dB
µA
)
AGND – 0.1
(VREF–) + 0.1
(VREF+) – 0.1
AVDD + 0.1
)
at DC
120
120
0.65
fVREFCM = 60Hz, fDATA = 60Hz
VREF = 1.25V
ON-CHIP VOLTAGE REFERENCE
Output Voltage
Short-Circuit Current Source
Short-Circuit Current Sink
Drift
Noise
Output Impedance
Startup Time
REF HI = 0
1.2
1.25
3
50
15
10
3
1.3
V
mA
µA
ppm/°C
µVrms
Ω
VRCAP = 0.1µF, BW = 0.1Hz to 100Hz
Sourcing 100µA
5
ms
IDAC
Full-Scale Output Current
RDAC = 75kΩ, Range = 1
RDAC = 75kΩ, Range = 2
RDAC = 75kΩ, Range = 3
RDAC = 15kΩ, Range = 3
0.5
1
2
mA
mA
mA
mA
kΩ
Bits
V
20
Current Setting Resistance (RDAC
Monotonicity
Compliance Voltage
Output Impedance
PSRR
)
10
8
0
RDAC = 75kΩ
AVDD – 1
See Typical Characteristics
VOUT = AVDD /2, Code > 16
Individual IDAC
600
5
ppm/V
%
Gain Error
Gain Error Drift
Gain Error Mismatch
Gain Error Mismatch Drift
Individual IDAC
Between IDACs, Same Range and Code
Between IDACs, Same Range and Code
75
0.25
15
ppm/°C
%
ppm/°C
NOTES: (1) FSR is Full-Scale Range. (2) ∆VOUT is change in digital result. (3) 12pF switched capacitor at fSAMP clock frequency.
ADS1217
SBAS260B
4
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