ELECTRICAL CHARACTERISTICS: V
DD
= 5V
All specifications T
MIN
to T
MAX
, V
DD
= +5V, f
MOD
= 19.2kHz, PGA = 1, Buffer ON, f
DATA
= 15Hz, V
REF
≡
(REF IN+) – (REF IN–) = +2.5V, unless otherwise specified.
ADS1242
ADS1243
PARAMETER
ANALOG INPUT (A
IN
0 – A
IN
7)
Analog Input Range
Full-Scale Input Range
Differential Input Impedance
Bandwidth
f
DATA
= 3.75Hz
f
DATA
= 7.50Hz
f
DATA
= 15.00Hz
Programmable Gain Amplifier
Input Capacitance
Input Leakage Current
Burnout Current Sources
OFFSET DAC
Offset DAC Range
CONDITIONS
MIN
TYP
MAX
UNITS
Buffer OFF
Buffer ON
(In+) – (In–), See Block Diagram, RANGE = 0
RANGE = 1
Buffer OFF
Buffer ON
–3dB
–3dB
–3dB
User-Selectable Gain Ranges
Modulator OFF, T = 25°C
GND – 0.1
GND + 0.05
V
DD
+ 0.1
V
DD
– 1.5
±V
REF
/PGA
±V
REF
/(2 • PGA)
5/PGA
5
1.65
3.44
14.6
V
V
V
V
MΩ
GΩ
Hz
Hz
Hz
1
9
5
2
±V
REF
/(2 • PGA)
±V
REF
/(4 • PGA)
8
±10
1
128
pF
pA
µA
V
V
Bits
%
ppm/°C
Bits
% of FS
ppm of FS
ppm of FS/°C
%
ppm/°C
dB
dB
dB
dB
dB
dB
V
DD
2.6
V
DD
V
V
V
dB
dB
µA
V
µA
µA
µA
µA
µA
µA
nA
mW
°C
°C
RANGE = 0
RANGE = 1
Offset DAC Monotonicity
Offset DAC Gain Error
Offset DAC Gain Error Drift
SYSTEM PERFORMANCE
Resolution
Integral Nonlinearity
Offset Error
(1)
Offset Drift
(1)
Gain Error
(1)
Gain Error Drift
(1)
Common-Mode Rejection
No Missing Codes
End Point Fit
24
±0.0015
7.5
0.02
0.005
0.5
Normal-Mode Rejection
Output Noise
Power-Supply Rejection
VOLTAGE REFERENCE INPUT
Reference Input Range
V
REF
Common-Mode Rejection
Common-Mode Rejection
Bias Current
(3)
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage
Current
f
CM
=
f
CM
=
f
SIG
=
f
SIG
=
at DC
60Hz, f
DATA
=
50Hz, f
DATA
=
50Hz, f
DATA
=
60Hz, f
DATA
=
100
15Hz
15Hz
15Hz
15Hz
80
0
0.1
0.1
130
120
100
100
See Typical Characteristics
95
at DC, dB = –20 log(∆V
OUT
/V
DD
)
(2)
REF IN+, REF IN–
V
REF
≡
(REF IN+) – (REF IN–), RANGE = 0
RANGE = 1
at DC
f
VREFCM
= 60Hz, f
DATA
= 15Hz
V
REF
= 2.5V
V
DD
PGA = 1, Buffer OFF
PGA = 128, Buffer OFF
PGA = 1, Buffer ON
PGA = 128, Buffer ON
SLEEP Mode
Read Data Continuous Mode
PDWN
PGA = 1, Buffer OFF
2.5
120
120
1.3
4.75
240
450
290
960
60
230
0.5
1.2
–40
–60
5.25
375
800
425
1400
Power Dissipation
TEMPERATURE RANGE
Operating
Storage
1.9
+85
+100
NOTES: (1) Calibration can minimize these errors.
(2)
∆V
OUT
is a change in digital result. (3) 12pF switched capacitor at f
SAMP
clock frequency.
ADS1242, 1243
SBAS235H
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