Datasheet

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ELECTRICAL CHARACTERISTICS
ADS1232
ADS1234
SBAS350F – JUNE 2005 – REVISED FEBRUARY 2008
All specifications at T
A
= – 40 ° C to +105 ° C, AVDD = DVDD = VREFP = +5V, and VREFN = AGND, unless otherwise noted.
ADS1232, ADS1234
PARAMETER CONDITIONS MIN TYP MAX UNIT
Analog Inputs
Full-Scale Input Voltage
± 0.5V
REF
/Gain V
(AINP – AINN)
AINxP or AINxN with respect to GND,
AGND – 0.1 AVDD + 0.1 V
Gain = 1, 2
Common-Mode Input Range
Gain = 64, 128 AGND + 1.5V AVDD – 1.5V V
Gain = 1 ± 3 nA
Differential Input Current Gain = 2 ± 6 nA
Gain = 64, 128 ± 3.5 nA
System Performance
Resolution No Missing Codes 24 Bits
Internal Oscillator, SPEED = High 78 80 82.4 SPS
Internal Oscillator, SPEED = Low 9.75 10 10.3 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
± 0.0002 ± 0.001 % of FSR
(1)
Gain = 1, 2
Integral Nonlinearity (INL)
Differential Input, End-Point Fit
± 0.0004 % of FSR
Gain = 64, 128
Gain = 1 ± 0.2 ± 5 ppm of FS
Input Offset Error
(2)
Gain = 128 ± 0.02 ± 1 ppm of FS
Gain = 1 ± 0.3 µV/ ° C
Input Offset Drift
Gain = 128 ± 10 nV/ ° C
Gain = 1 ± 0.001 ± 0.02 %
Gain Error
(3)
Gain = 128 ± 0.01 ± 0.1 %
Gain = 1 ± 0.2 ppm/ ° C
Gain Drift
Gain = 128 ± 2.5 ppm/ ° C
Internal Oscillator, f
DATA
= 10SPS
100 110 dB
f
IN
= 50Hz or 60Hz, ± 1Hz
Normal-Mode Rejection
(4)
External Oscillator, f
DATA
= 10SPS
120 130 dB
f
IN
= 50Hz or 60Hz, ± 1Hz
at DC, Gain = 1, Δ V = 1V 95 110 dB
Common-Mode Rejection
at DC, Gain = 128, Δ V = 0.1V 95 110 dB
Input-Referred Noise See Noise Performance Tables
at DC, Gain = 1, Δ V = 1V 100 120 dB
Power-Supply Rejection
at DC, Gain = 128, Δ V = 0.1V 100 120 dB
Voltage Reference Input
Voltage Reference Input (V
REF
) V
REF
= VREFP – VREFN 1.5 AVDD AVDD + 0.1V V
Negative Reference Input (VREFN) AGND – 0.1 VREFP – 1.5 V
Positive Reference Input (VREFP) VREFN + 1.5 AVDD + 0.1 V
Voltage Reference
10 nA
Input Current
(1) FSR = full-scale range = V
REF
/Gain.
(2) Offset calibration can minimize these errors to the level of noise at any temperature.
(3) Gain errors are calibrated at the factory (AVDD = +5V, all gains, T
A
= +25 ° C).
(4) Specification is assured by the combination of design and final production test.
Copyright © 2005 – 2008, Texas Instruments Incorporated 3
Product Folder Link(s): ADS1232 ADS1234