ADS1299
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SBAS499A –JULY 2012–REVISED AUGUST 2012
ELECTRICAL CHARACTERISTICS
Minimum and maximum specifications apply from –40°C to +85°C. Typical specifications are at +25°C. All specifications are
at DVDD = 3.3 V, AVDD – AVSS = 5 V, VREF = 4.5 V, external fCLK = 2.048 MHz, data rate = 250 SPS, and gain = 12, unless
otherwise noted.
ADS1299
PARAMETER
ANALOG INPUTS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Full-scale differential input voltage
(AINP – AINN)
±VREF / gain
V
See the Input Common-Mode Range
subsection of the PGA Settings and Input
Range section
Input common-mode range
Ci
IIB
Input capacitance
Input bias current
20
pF
pA
TA = +25°C, input = 2.5 V
±300
TA = –40°C to +85°C, input = 2.5 V
No lead-off
±300
500
pA
1000
MΩ
DC input impedance
Current source lead-off detection
(ILEADOFF = 6 nA)
MΩ
PGA PERFORMANCE
Gain settings
1, 2, 4, 6, 8, 12, 24
See Table 5
BW
Bandwidth
ADC PERFORMANCE
Resolution
24
250
Bits
DR
Data rate
fCLK = 2.048 MHz
16000
SPS
CHANNEL PERFORMANCE (DC Performance)
10 seconds of data, gain = 24(1)
1.0
1.0
μVPP
μVPP
250 points, 1 second of data, gain = 24,
TA = +25°C
1.35
1.6
Input-referred noise (0.01 Hz to 70 Hz)
250 points, 1 second of data, gain = 24,
TA = –40°C to +85°C
1.0
μVPP
All other sample rates and gain settings
Full-scale with gain = 12, best fit
See Noise Measurements section
INL
EO
Integral nonlinearity
Offset error
8
60
80
0.1
3
ppm
μV
Offset error drift
Gain error
nV/°C
% of FS
ppm/°C
% of FS
EG
Excluding voltage reference error
Excluding voltage reference drift
±0.5
Gain drift
Gain match between channels
0.2
CHANNEL PERFORMANCE (AC Performance)
CMRR
PSRR
Common-mode rejection ratio
Power-supply rejection ratio
Crosstalk
fCM = 50 Hz and 60 Hz(2)
–110
–120
96
dB
dB
dB
dB
dB
fPS = 50 Hz and 60 Hz
fIN = 50 Hz and 60 Hz
–110
121
–99
SNR
THD
Signal-to-noise ratio
VIN = –2 dBFs, fIN = 10-Hz input, gain = 12
VIN = –0.5 dBFs, fIN = 10 Hz
Total harmonic distortion
(1) Noise data measured in a 10-second interval. Test not performed in production. Input-referred noise is calculated with the input shorted
(without electrode resistance) over a 10-second interval.
(2) CMRR is measured with a common-mode signal of AVSS + 0.3 V to AVDD – 0.3 V. The values indicated are the minimum of the eight
channels.
Copyright © 2012, Texas Instruments Incorporated
3
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