Measurement-computing USB-2404-10 Manual do Utilizador descarregar pdf (Página 15)

Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for the range 0 to 60 °C unless otherwise noted.

All voltages are relative to the CH– signal on each channel unless otherwise noted.

Analog input

Table 1. Analog input specifications

Parameter

Conditions

Specification

Number of channels

A/D converter resolution

24-bit

A/D converter type

Delta-Sigma with analog pre-filtering

Sampling mode

Simultaneous

Sample rate range )

Minimum: 1.613 kS/s

Maximum: 50 kS/s (Note 1)

Sample rates )

Internal master timebase )

Frequency: 12.8 MHz

Accuracy: ±100 ppm maximum

Input voltage ranges

CH+ to CH–

±10 V, nominal

±10.52 V, typical

±10.3 V, minimum

Overvoltage protection

±100 V

Input coupling

Input impedance

CH+ to CH–

1 MΩ

Input noise

70 µV rms

Gain drift

±5 ppm/ºC

Offset drift

±24 µV/ºC

Post calibration gain match

channel-to- channel, 20 kHz

0.22 dB maximum

Crosstalk

1 kHz

–130 dB

Phase mismatch

channel-to- channel

0.075º/kHz maximum

Phase nonlinearity

= 50 kS/s

0.11º maximum

Input delay

38.4 +3 µs

Passband frequency

0.453 ·

Passband flatness

= 50 kS/s

±100 mdB maximum

Stopband frequency

0.547 ·

Stopband rejection

100 dB

Alias-free bandwidth

0.453 ·

–3 dB pre-filter bandwidth

= 50 kS/s

24.56 kHz

Common mode rejection ratio

(CMRR)

= 60 Hz

126 dB

Spurious free dynamic range

(SFDR)

1 kHz, –60 dBFS

–128 dBFS

Total harmonic distortion

1 kHz, –1 dBFS

–99 dB

1 kHz, –20 dBFS

–105 dB

Note 1: Full performance requires connections to a USB 2.0 Hi-Speed host controller and USB 2.0 high-

speed hubs.) The maximum sample rate may be lower on USB 1.1 ports.

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