ELECTRICAL CHARACTERISTICS: AVDD = 3V
All specifications TMIN to TMAX, AVDD = +3V, DVDD = +2.7V to 5.25V, fMOD = 19.2kHz, fOSC = 2.4576MHz, PGA = 1, Buffer ON, RDAC = 75kΩ, fDATA=10Hz,
VREF ≡ (REF IN+) – (REF IN–) = +1.25V unless otherwise specified.
ADS1218
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT (AIN0 – AIN7, AINCOM
)
Analog Input Range
Buffer OFF
Buffer ON
(In+) – (In–) See Block Diagram
Buffer OFF
AGND – 0.1
AGND + 0.05
AVDD + 0.1
AVDD – 1.5
±VREF /PGA
V
V
V
MΩ
nA
Full-Scale Input Voltage Range
Input Impedance
Input Current
5/PGA
0.5
Buffer ON
Bandwidth
Fast Settling Filter
Sinc2 Filter
Sinc3 Filter
–3dB
–3dB
–3dB
0.469 • fDATA
0.318 • fDATA
0.262 • fDATA
Hz
Hz
Hz
Programmable Gain Amplifier
Input Capacitance
Input Leakage Current
Burnout Current Sources
User Selectable Gain Ranges
1
128
9
5
2
pF
pA
µA
Modulator OFF, T = 25°C
OFFSET DAC
Offset DAC Range
±VREF /(2 • PGA)
V
Bits
%
Offset DAC Monotonicity
Offset DAC Gain Error
Offset DAC Gain Error Drift
8
±10
2
ppm/°C
SYSTEM PERFORMANCE
Resolution
24
Bits
No Missing Codes
Integral Non-Linearity
Offset Error(1)
24
±0.0015
Bits
% of FS
ppm of FS
ppm of FS/°C
%
ppm/°C
dB
End Point Fit
Before Calibration
15
0.04
0.010
1.0
Offset Drift(1)
Gain Error
Gain Error Drift(1)
Common-Mode Rejection
After Calibration
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 Range
VREF
Common-Mode Rejection
Common-Mode Rejection
Bias Current(3)
REF IN+, REF IN–
VREF ≡ (REF IN+) – (REF IN–)
at DC
fVREFCM = 60Hz, fDATA = 60Hz
VREF = 1.25V
0
0.1
AVDD
1.25
V
V
dB
dB
µA
120
120
0.65
ON-CHIP VOLTAGE REFERENCE
Output Voltage
REF HI = 0 at 25°C
1.245
1.25
1.255
V
Short-Circuit Current Source
Short-Circuit Current Sink
Short-Circuit Duration
Drift
Noise
Output Impedance
Startup Time
3
50
Indefinite
mA
µA
Sink or Source
5
10
3
ppm/°C
µVp-p
Ω
BW = 0.1Hz to 100Hz
Sourcing 100µA
50
µs
IDAC
Full-Scale Output Current
RDAC = 75kΩ, Range = 1
RDAC = 75kΩ, Range = 2
RDAC = 75kΩ, Range = 3
RDAC = 15kΩ, Range = 3
RDAC = 10kΩ
0.5
1
2
20
Indefinite
mA
mA
mA
mA
Maximum Short-Circuit Current Duration
RDAC = 0Ω
RDAC = 75kΩ
10
Minute
Bits
V
Monotonicity
8
0
Compliance Voltage
Output Impedance
PSRR
Absolute Error
Absolute Drift
Mismatch Error
Mismatch Drift
AVDD – 1
see Typical Characteristics
VOUT = AVDD /2
Individual IDAC
Individual IDAC
600
5
75
0.25
15
ppm/V
%
ppm/°C
%
Between IDACs, Same Range and Code
Between IDACs, Same Range and Code
ppm/°C
ADS1218
4
SBAS187
BB [ BURR-BROWN CORPORATION ]
