ELECTRICAL CHARACTERISTICS: VDD = 5V
All specifications TMIN to TMAX, VDD = +5V, fMOD = 19.2kHz, PGA = 1, Buffer ON, fDATA = 15Hz, VREF ≡ (REF IN+) – (REF IN–) = +2.5V, unless otherwise specified.
ADS1242
ADS1243
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT (AIN0 – AIN7)
Analog Input Range
Buffer OFF
Buffer ON
GND – 0.1
GND + 0.05
VDD + 0.1
VDD – 1.5
V
V
Full-Scale Input Range
(In+) – (In–), See Block Diagram, RANGE = 0
RANGE = 1
±VREF /PGA
±VREF /(2 • PGA)
V
V
Differential Input Impedance
Buffer OFF
Buffer ON
5/PGA
5
MΩ
GΩ
Bandwidth
fDATA = 3.75Hz
fDATA = 7.50Hz
fDATA = 15.00Hz
–3dB
–3dB
–3dB
1.65
3.44
14.6
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
RANGE = 0
RANGE = 1
±VREF /(2 • PGA)
±VREF /(4 • PGA)
V
V
Offset DAC Monotonicity
Offset DAC Gain Error
8
Bits
%
±10
Offset DAC Gain Error Drift
1
ppm/°C
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
Bits
% of FS
ppm of FS
ppm of FS/°C
%
ppm/°C
dB
±0.0015
7.5
0.02
0.005
0.5
at DC
100
f
CM = 60Hz, fDATA = 15Hz
130
120
100
100
dB
dB
dB
dB
fCM = 50Hz, fDATA = 15Hz
Normal-Mode Rejection
f
f
SIG = 50Hz, fDATA = 15Hz
SIG = 60Hz, fDATA = 15Hz
Output Noise
Power-Supply Rejection
See Typical Characteristics
95
(2)
at DC, dB = –20 log(∆VOUT /VDD
)
80
dB
VOLTAGE REFERENCE INPUT
Reference Input Range
VREF
REF IN+, REF IN–
VREF ≡ (REF IN+) – (REF IN–), RANGE = 0
RANGE = 1
0
0.1
0.1
VDD
2.6
VDD
V
V
V
2.5
Common-Mode Rejection
Common-Mode Rejection
Bias Current(3)
at DC
120
120
1.3
dB
dB
µA
fVREFCM = 60Hz, fDATA = 15Hz
VREF = 2.5V
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage
Current
VDD
4.75
5.25
375
800
425
1400
V
µA
µA
µA
µA
µA
µA
nA
mW
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
240
450
290
960
60
230
0.5
1.2
Power Dissipation
1.9
TEMPERATURE RANGE
Operating
Storage
–40
–60
+85
+100
°C
°C
NOTES: (1) Calibration can minimize these errors. (2) ∆VOUT is a change in digital result. (3) 12pF switched capacitor at fSAMP clock frequency.
ADS1242, 1243
3
SBAS235B
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