PS081 datasheet(13/155 Pages) AMSCO

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2-4

PSØ81

Table 2.7 Performance at Vcc = 3.3V with internal comparator

ENOB dR/R strain resistance

ENOB 2mV/V, Fast settle*

Frequency

(Hz)

No filter

SINC3

SINC5

500

23.0

24.0

24.4

14.0

250

23.6

24.4

25.1

14.6

100

24.4

25.0

25.3

15.4

24.7

25.4

25.7

15.7

25.2

26.0

26.2

16.2

25.8

26.6

26.9

16.8

26.4

27.1

27.5

17.4

* Fast settle = without filter

Table 2.8 General parameters

Symbol Parameter

Conditions

Min

Typ

Max

Unit

INL

Integral Non-linearity

Offset drift

Gain drift

over -20°C … +70°C

Supply Voltage 3.0V to 3.6V

Total system, 350

Ω SG

Full-bridge

Wheatstone

Total System. 350

Ω SG, 5V

0.01*

~ 1

µV/V

nV/V/K

ppm/K

PSSR

Power Supply Rejec-

tion Ratio Vcc

1.8V or 3.3 V +-0.3 V

106

@1.8V

130

@3.3V

* equals to ± 1.25 ppm of A/D-Converters with PGA setting 128

** using full bridge wiring for minimum zero drift

2.5

Integral Nonlinearity

The integral nonlinearity (INL) of PS081 can be specified to ± 0.01 µV (1.25 ppm). Expressed in divi-

sions this corresponds to ± 1: 200,000. This is a tremendous high linearity compared to the one of

nowadays latest A/D converters. Ordinary A/D converts have a linearity in the range of ± 0.12µV/V

(15 ppm), better A/D converters reach a linearity of ± 0.4 µV (5ppm).

Of course, you can only determine the linearity of the electronics itself, if you can provide a sensor

which is accurate and linear enough to measure it. We used for this purpose the revised version of

the acam load cell simulator (ALCS350-V2) which offers comfortable methods to investigate not only

the linearity, but also variations over temperature or voltage. The linearity of ALCS350-V2 is ± 0.01

µV/V (1:200,000) with PICOSTRAIN wiring and ± 0.04 µV/V with Wheatstone wiring and there-

fore much more linear than an ordinary load cell. Linearity investigations with the PS081 and the

ALCS350-V2 as a sensor are shown in the following tables. More details about the possibilities and

the limitations of the load cell simulator are provided in the ALCS350-V2 datasheet.

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