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SBAS424C – JUNE 2009 – REVISED MARCH 2010
ELECTRICAL CHARACTERISTICS
Minimum/maximum specifications are at T
A
= –40°C to +105°C. Typical specifications are at T
A
= +25°C, AVDD = +2.5V, AVSS = –2.5V,
DVDD = +3.3V, f
CLK
= 7.3728MHz, V
REF
= 2.5V, and f
DATA
= 60SPS, unless otherwise noted.
ADS1259
PARAMETER
ANALOG INPUTS
Full-scale input voltage range (FSR)
Absolute input voltage
(AINP, AINN to DGND)
Differential input impedance
Common-mode input impedance
SYSTEM PERFORMANCE
Resolution
Data rate (f
DATA
)
Integral nonlinearity
Offset error
Offset error after calibration
Offset drift
Gain error
(4)
(3)
ADS1259B
MAX
MIN
TYP
MAX
UNIT
TEST CONDITIONS
MIN
TYP
V
IN
= (AINP – AINN)
AVSS – 0.1
±V
REF
AVDD + 0.1
120
500
AVSS – 0.1
±V
REF
AVDD + 0.1
120
500
V
V
kΩ
kΩ
No missing codes
24
10
14400
±0.0003
±40
±1
±0.001
±250
24
10
±0.00004
(2)
±40
±1
0.25
±0.5
0.05
±0.05
±0.0002
2.5
0.5
2.5
0.25
±0.5
14400
±0.0003
±250
Bits
SPS
(1)
%FSR
mV
mV
mV/°C
%
%
ppm/°C
Best fit method
T
A
= –40°C to +105°C
0.05
±0.05
(5)
(3)
Gain error after calibration
Gain drift
(4)
Normal mode rejection
Common-mode rejection
Noise
±0.0002
T
A
= –40°C to +105°C
See
60Hz, ac
(6)
See
60Hz, ac
(6)
60Hz, ac
(6)
85
85
100
120
0.7
95
110
85
85
100
0.5
120
0.7
95
110
dB
mV
dB
dB
AVDD, AVSS power-supply
rejection
DVDD power-supply rejection
OUT-OF-RANGE DETECTION
Threshold
(7)
VOLTAGE REFERENCE INPUTS
Reference input range (V
REF
)
Negative reference absolute input
(VREFN to DGND)
Positive reference absolute input
(VREFP to DGND)
Average reference input current
(8)
Average reference input current drift
INTERNAL VOLTAGE REFERENCE
Reference output voltage
Accuracy
Temperature drift
(4)
Drive current sink and source
Load regulation
Turn-on settling time
(10)
Level
Accuracy
±105
±0.5
±105
±0.5
%FSR
%FSR
V
REF
= (VREFP –
VREFN)
0.5
AVSS –
100mV
VREFN + 0.5
2.5
AVDD – AVSS +
200mV
VREFP – 0.5
AVDD + 100mV
0.5
AVSS –
100mV
VREFN + 0.5
2.5
AVDD – AVSS +
200mV
VREFP – 0.5
AVDD + 100mV
V
V
V
200nA +
60nA/V
Internal or external clock
0.2
200nA +
60nA/V
0.2
nA/°C
V
REFOUT
= (REFOUT –
AVSS)
T
A
= +25°C
T
A
= –40°C to +105°C
T
A
= 0°C to +85°C
–10
2.5
±0.4
10
40
2.5
±0.2
4
2
10
–10
10
1
12
5
10
V
%
ppm/°C
ppm/°C
mA
(9)
mV/mA
s
10
±0.001% settling
1
SPS = samples per second.
Shaded cells indicate improved specifications of the ADS1259B.
Calibration accuracy is on the level of noise (signal and ADC), reduced by the effect of 16 reading averaging.
Reference drift specified by design and final production test. Drift calculated over the specified temperature range using box method.
Excludes internal reference error.
f
DATA
= 14.4kSPS. Placing a notch of the digital filter at 60Hz (setting f
DATA
= 10SPS or 60SPS) further improves the common-mode
rejection and power-supply rejection of this input frequency.
(7) Absolute input voltage range for out-of-range specification: AVSS + 150mV
≤
AINP or AINN
≤
AVDD – 150mV.
(8) Over the range: AVSS
≤
VREFP or VREFN
≤
AVDD. For reference voltage exceeding AVDD or AVSS, input current = 150nA/10mV.
(9) Limit the reference output current to ±10mA.
(10) C
REFOUT
= 1mF, C
REFIN
= 1mF.
(1)
(2)
(3)
(4)
(5)
(6)
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