Datasheet

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ELECTRICAL CHARACTERISTICS: AV
DD
= +3V
ADS1216
SBAS171D – NOVEMBER 2000 – REVISED SEPTEMBER 2006
All specifications at T
MIN
to T
MAX
, AV
DD
= +3V, DV
DD
= +2.7V to +5.25V, f
MOD
= 19.2kHz, PGA = 1, Buffer ON, R
DAC
= 75k Ω ,
f
DATA
= 10Hz, and V
REF
= +1.25V, unless otherwise specified.
ADS1216
PARAMETER CONDITIONS MIN TYP MAX UNIT
ANALOG INPUT (A
IN
0 – A
IN
7, A
INCOM
)
Analog input range Buffer OFF AGND – 0.1 AV
DD
+ 0.1 V
Buffer ON AGND + 0.05 AV
DD
– 1.5 V
Full-scale input voltage range (In+) – (In–); see Functional Block ± V
REF
/PGA V
Diagram
Input impedance Buffer OFF 5/PGA M Ω
Input current Buffer ON 0.5 nA
Bandwidth
Fast-settling filter –3dB 0.469 × f
DATA
Hz
–3dB 0.318 × f
DATA
Hz
Sinc
2
filter
–3dB 0.262 × f
DATA
Hz
Sinc
3
filter
Programmable gain amplifier User-selectable gain ranges 1 128
Input capacitance 9 pF
Input leakage current Modulator OFF, T
A
= +25 ° C 5 pA
Burnout current sources 2 µ A
OFFSET DAC
Offset DAC range ± V
REF
/(2 × PGA) V
Offset DAC monotonicity 8 Bits
Offset DAC gain error ± 10 %
Offset DAC gain error drift 2 ppm/ ° C
SYSTEM PERFORMANCE
Resolution 24 Bits
No missing codes 24 Bits
Sinc
3
filter
Integral nonlinearity End-point fit ± 0.0015 % of FS
Offset error
(1)
15 ppm of FS
Offset drift
(1)
0.04 ppm of FS/ ° C
Gain error
(1)
0.010 %
Gain error drift
(1)
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 range REF IN+, REF IN– 0 AV
DD
V
V
REF
V
REF
≡ (REF IN+) – (REF IN–) 0.1 1.25 1.3 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 µ A
(1) Calibration can minimize these errors.
(2) ∆ V
OUT
is change in digital result.
(3) 12pF switched capacitor at f
SAMP
clock frequency.
5
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