Measurement-computing USB-1608GX-2AO-OEM Manual do Utilizador descarregar pdf (Página 17)

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. General analog input specifications

Parameter Condition Specification

A/D converter type Successive approximation

ADC resolution 16 bits

Number of channels 8 differential, 16 single-ended

Software-selectable

Input voltage range ±10 V, ±5 V, ±2 V, ±1 V

Software-selectable per channel

Absolute max input voltage CHx relative to AGND  ±25 V max (power on)

 ±15 V max (power off)

Input impedance  1 GΩ (power on)

 820 Ω (power off)

Input bias current ±10 nA

Input bandwidth All input ranges,

small signal (–3 dB)

870 kHz

Input capacitance 60 pf

Max working voltage (signal

+ common mode)

±10 V range ±10.2 V max relative to AGND

±5 V range ±10.2 V max relative to AGND

±2 V range ±9.5 V max relative to AGND

±1 V range ±9.0 V max relative to AGND

Common mode rejection ratio

(

= 60 Hz, all input

ranges)

86 dB

Crosstalk Adjacent differential mode

channels, DC to 100 kHz

–75 dB

Input coupling DC

Sampling rate 0.0149 Hz to 500 kHz; software-selectable

Trigger source TRIG (see External trigger on page 20)

Sample clock source Internal A/D clock or external A/D clock (AICKI pin)

Burst mode 2 µs

Software-selectable using the internal A/D clock; always

enabled when using the external clock (AICKI pin).

Throughput Software paced 33 to 4000 S/s typ, system dependent

Hardware paced 500 kS/s max

Channel gain queue Up to 16 elements Software-selectable range for each channel

Warm-up time 15 minutes min

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 25 26

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