Measurement-computing CIO-DAS801 Manual do Utilizador descarregar pdf (Página 18)

Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for 25°C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter

Specification

A/D converter type

AD674A, successive approximation

Resolution

12-bits

Number of channels

Input ranges

±10 V, ±5 V , ±1 V, ±0.5 V , ±0.1 V, ±0.05 V, ±0.01 V , ±0.005 V,

0 to 10 V, 0 to 1 V, 0 to 0.1 V, 0 to 0.01 V, fully programmable

Polarity

Unipolar/Bipolar programmable

A/D pacing

Programmable: internal counter or external source (IR Input / XCLK, falling

edge) or software polled

A/D trigger sources

External hardware (DIN1 / Trig, rising edge)

Data transfer

Interrupt or software polled from 256 sample FIFO buffer

Channel configuration

Differential (or pseudo-differential with installation of a SIP resistor) or

single-ended, switch selectable for each channel

DMA

None

A/D conversion time

20 µs

Throughput

50 kHz

Accuracy

±0.01% of full scale ±1 LSB typ, ±0.05% of full scale ±1 LSB max

Differential linearity error

±0.5 LSB max

Integral linearity error

±1 LSB

No missing codes (guaranteed)

12-bits

Gain drift (A/D specs)

±50 ppm/°C

Zero drift (A/D specs)

±10 ppm/°C

Common mode range

±10 V

CMRR @ 60 Hz

Gain = 1 70 dB min

Gain = 10 90 dB min

Gain ≥ 100 100 dB min

Input leakage current (@ 25 C)

± 30 nA

Input leakage current (over temperature)

±250 nA

Input impedance

>1 Gohm typical

Absolute maximum input voltage

±35 V

Noise distribution (results presented as Average % ±2 bins, Average % ±1 bin, Average # bins):

Bipolar

10 V, 5 V, 1 V 100% / 100% / 3 bins

0.5 V, 0.1 V 100% / 99.3% / 4 bins

0.05 V 100% / 99.1% / 5 bins

0.01 V 95.2% / 79.8% / 11 bins

0.005 V 72% / 48.3% / 21 bins

1 2 ... 13 14 15 16 17 18 19 20 21 22

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