ADS131B04-Q1
ZHCSMK3B –NOVEMBER 2020 –REVISED NOVEMBER 2021
www.ti.com.cn
6.5 Electrical Characteristics
minimum and maximum specifications apply from TA = –40°C to +125°C; typical specifications are at TA = 25°C; all
specifications are at AVDD = 3.3 V, DVDD = 3.3 V, external clock, fCLKIN = 8.192 MHz, high-resolution mode, all channels, all
gains, data rate = 4 kSPS, all channels enabled, and global-chop mode disabled (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
ANALOG INPUTS
Global-chop disabled
25
MΩ
Global-chop enabled
300
Zin
Differential input impedance
All power modes, all data rates
See 表8-2
Global-chop disabled, VAINxP = VAINxN = 0 V
Global-chop enabled, VAINxP = VAINxN = 0 V
Global-chop disabled, VAINxP = VAINxN = 0 V
Global-chop enabled, VAINxP = VAINxN = 0 V
±1
±1
Absolute input current
Differential input current
nA
pA
±50
±30
ADC CHARACTERISTICS
Resolution
24
Bits
Gain settings
1, 2, 4, 8, 16, 32, 64, 128
High-resolution mode, fCLKIN = 8.192 MHz
Low-power mode, fCLKIN = 4.096 MHz
Very-low-power mode, fCLKIN = 2.048 MHz
250
125
32k
fDATA
Data rate
16k SPS
8k
62.5
ADC PERFORMANCE
ppm of
FSR
INL
Integral nonlinearity (best fit) Differential-ended input
10
Global-chop disabled
±200
±0.3
±0.4
100
50
800
–800
–2
Offset error (input referred) Global-chop enabled, channel 2
2
4
µV
Global-chop enabled, channel 0, 1, 3
Global-chop disabled, gain = 1 to 4
Global-chop disabled, gain = 8 to 128
Global-chop enabled, channel 2
–4
500
200
15
Offset drift
nV/°C
7
Global-chop enabled, channel 0, 1, 3
10
30
1000 hours at TA = 85°C, global-chop
disabled
0.8
0.25
±0.2%
8
Offset error long-term drift
Gain error
μV
1000 hours at TA = 85°C, global-chop
enabled
Including error of internal voltage reference,
TA = 25°C
0.7%
30
–0.7%
Including drift of internal voltage reference,
TA = –40°C to +85°C, gain = 1 to 4
Including drift of internal voltage reference,
TA = –40°C to +85°C, gain = 8 to 128
Gain drift
7
25 ppm/°C
40
Including drift of internal voltage reference,
TA = –40°C to +125°C
13
1000 hours at TA = 85°C, gain = 1,
including drift of internal voltage reference
Gain error long-term drift
250
ppm
At dc, global-chop disabled, gain = 1
At dc, global-chop enabled, gain = 1
96
128
Common-mode rejection
ratio
fCM = 50 Hz or 60 Hz, global-chop disabled,
gain = 1
CMRR
dB
89
fCM = 50 Hz or 60 Hz, global-chop enabled,
gain = 1
106
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