Datasheet
ADS1258-EP
www.ti.com
SBAS445D –MARCH 2009– REVISED MARCH 2011
ELECTRICAL CHARACTERISTICS
All specifications at T
A
= –55°C to 125°C, AVDD = 2.5 V, AVSS = –2.5 V, DVDD = 3.3 V, f
CLK
= 16 MHz (external clock) or f
CLK
= 15.729
MHz (internal clock), OPA227 buffer between MUX outputs and ADC inputs, V
REF
= 4.096 V, and VREFN = –2.5 V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP
(1)
MAX UNIT
Analog Multiplexer Inputs
AIN0–AIN15,
AVSS – AVDD +
Absolute Input Voltage AINCOM with respect to V
100 mV 100mV
DGND
On-Channel Resistance 80 Ω
Crosstalk f
IN
= 1 kHz –110 dB
SBCS[1:0] = 01 1.5
Sensor Bias (Current Source) μA
SBCS[1:0] = 11 24
1.5 μA:24 μA Ratio Error 1 %
ADC Input
Full-Scale Input Voltage (V
IN
= ADCINP – ADCINN) ±1.06 V
REF
V
AVSS – AVDD +
Absolute Input Voltage (ADCINP, ADCINN) V
100 mV 100mV
Differential Input Impedance 65 kΩ
System Performance
Resolution No Missing Codes 24 Bits
Data Rate, Fixed-Channel Mode 1.953 125 kSPS
Data Rate, Auto-Scan Mode 1.805 23.739 kSPS
% of
Integral Nonlinearity (INL)
(2)
Differential Input 0.0003 0.0010
FSR
(3)
Chopping Off 20
Offset Error Shorted T
A
= –40°C to 105°C 1 10 μV
Chopping On
Inputs
T
A
= –55°C to 125°C -650 650
Chopping Off 0.5
Offset Drift Shorted Inputs μV/°C
Chopping On 0.02 0.1
T
A
= –40°C to 105°C 0.1 0.5
Gain Error %
T
A
= –55°C to 125°C -0.5 0.1 0.5
T
A
= –40°C to 105°C 0.4 2
Gain Drift ppm/°C
T
A
= –55°C to 125°C 0.4
Noise (see Table 4)
Common-Mode Rejection f
CM
= 60 Hz 90 100 dB
AVDD, AVSS 70 85
Power-Supply Rejection f
PS
= 60 Hz dB
DVDD 80 95
Voltage Reference Input
AVDD –
Reference Input Voltage (V
REF
= VREFP – VREFN) 0.5 4.096 V
AVSS
Negative Reference Input (VREFN) AVSS – 0.1 V VREFP – 0.5 V
Positive Reference Input (VREFP) VREFN + 0.5 AVDD + 0.1V V
Reference Input Impedance 40 kΩ
System Parameters
External Reference Reading Error 1 3 %
Analog Supply Reading Error 1 3 %
Voltage T
A
= 25°C 168 mV
Only ADS1258-EP temperature
394
Temperature Sensor Reading forced; test PCB in free-air.
Coefficient μV/°C
ADS1258-EP and test PCB
563
temperatures forced together.
(1) T
A
= 25°C for typical parameters.
(2) Best straight line fit method.
(3) FSR = Full-scale range = 2.13 V
REF
.
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