Datasheet

ADS1158
www.ti.com SBAS429D –JUNE 2008– REVISED MARCH 2011
ELECTRICAL CHARACTERISTICS
All specifications at T
A
= –40°C to +105°C, AVDD = +2.5V, AVSS = –2.5V, DVDD = +3.3V, f
CLK
= 16MHz (external clock) or f
CLK
=
15.729MHz (internal clock), OPA227 buffer between MUX outputs and ADC inputs, V
REF
= +4.096V, and VREFN = –2.5V, unless otherwise
noted.
ADS1158
PARAMETER CONDITIONS MIN TYP MAX UNIT
ANALOG MULTIPLEXER INPUTS
AIN0–AIN15,
Absolute input voltage AVSS – 100mV AVDD + 100mV V
AINCOM with respect to DGND
On-channel resistance 80 Ω
Crosstalk f
IN
= 1kHz –110 dB
SBCS[1:0] = 01 1.5
Sensor bias (current source) μA
SBCS[1:0] = 11 24
1.5μA:24μA ratio error 1 %
ADC INPUT
Full-scale input voltage (V
IN
= ADCINP – ADCINN) ±1.06 V
REF
V
Absolute input voltage (ADCINP, ADCINN) AVSS – 100mV AVDD + 100mV V
Differential input impedance 65 kΩ
SYSTEM PERFORMANCE
Resolution No missing codes 16 Bits
Data rate, fixed-channel mode 1.953 125 kSPS
Data rate, auto-scan mode 1.805 23.739 kSPS
Integral nonlinearity (INL)
(1)
Differential input 0.3 1 LSB
(2)
Offset error Chopping on Shorted inputs –1 –0.5
(3)
0 LSB
Offset drift Shorted inputs 1 μV/°C
Gain error 0.1 0.5 %
Gain drift 2 ppm/°C
Noise 0.6 LSB (
PP
)
Common-mode rejection f
CM
= 60Hz 100 dB
AVDD, AVSS 85
Power-supply rejection f
PS
= 60Hz dB
DVDD 95
VOLTAGE REFERENCE INPUT
Reference input voltage (V
REF
= VREFP – VREFN) 0.5 4.096 AVDD – AVSS V
Negative reference input (VREFN) AVSS – 0.1V 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 5 %
Voltage T
A
= +25°C 168 mV
Temperature sensor reading 394
(4)
μV/°C
Coefficient
563
(5)
μV/°C
(1) Best straight line fit method.
(2) FSR = Full-scale range = 2.13V
REF
.
(3) Systematic –0.5LSB in reading code.
(4) ADS1158 temperature forced alone, test PCB in free air.
(5) ADS1158 and test PCB temperatures forced together.
Copyright © 2008–2011, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): ADS1158