Datasheet

ADS1230
www.ti.com SBAS366B –OCTOBER 2006–REVISED SEPTEMBER 2012
ELECTRICAL CHARACTERISTICS
All specifications at T
A
= –40°C to +85°C, AVDD = DVDD = REFP = +5V, REFN = AGND, and Gain = 64, unless otherwise noted.
ADS1230
PARAMETER CONDITIONS MIN TYP MAX UNIT
Analog Inputs
Full-Scale Input Voltage (AINP – AINN) ±0.5V
REF
/PGA V
Common-Mode Input Range AGND + 1.5V AVDD – 1.5V V
Differential Input Current ±2 nA
System Performance
Resolution No Missing Codes 20 Bits
Internal Oscillator, SPEED = High 80 SPS
Internal Oscillator, SPEED = Low 10 SPS
Data Rate
External Oscillator, SPEED = High f
CLK
/61,440 SPS
External Oscillator, SPEED = Low f
CLK
/491,520 SPS
Digital Filter Settling Time Full Settling 4 Conversions
Differential Input, End-Point Fit, G = 64 ±10 ppm
Integral Nonlinearity (INL)
Differential Input, End-Point Fit, G = 128 ±6 ppm
Input Offset Error
(1)
±3 ppm of FS
Input Offset Drift ±10 nV/°C
Gain Error ±0.8 %
Gain Drift ±4 ppm/°C
Internal Oscillator 80 90 dB
f
IN
= 50Hz or 60Hz ±1Hz,
Normal-Mode Rejection
(2)
f
DATA
= 10SPS
External Oscillator
(3)
90 100 dB
Common-Mode Rejection at DC, AVDD = 0.1V 110 dB
f
DATA
= 10SPS 53 nV, rms
Input-Referred Noise
f
DATA
= 80SPS 100 nV, rms
Power-Supply Rejection at DC, AVDD = 0.1V 90 100 dB
Voltage Reference Input
Voltage Reference Input (V
REF
) V
REF
= REFP – REFN 1.5 AVDD AVDD + 0.1V V
Negative Reference Input (REFN) AGND – 0.1 REFP – 1.5 V
Positive Reference Input (REFP) REFN + 1.5 AVDD + 0.1 V
Voltage Reference Input Current 10 nA
Digital
All digital inputs except CLKIN 0.7 DVDD DVDD + 0.1 V
V
IH
CLKIN 0.7 DVDD 5.1 V
Logic Levels V
IL
DGND 0.2 DVDD V
V
OH
I
OH
= 1mA DVDD – 0.4 V
V
OL
I
OL
= 1mA 0.2 DVDD V
Input Leakage 0 < V
IN
< DVDD ±10 μA
External Clock Input Frequency (f
CLKIN
) 0.2 4.9152 6 MHz
Serial Clock Input Frequency (f
SCLK
) 5 MHz
(1) Offset calibration can minimize these errors to the level of noise at any temperature.
(2) Specification is assured by the combination of design and final production test.
(3) External oscillator = 4.9152MHz.
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