Chapter 6

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

 

 

Table 1. Analog input specifications

 

 

A/D converter type

Sub-ranging sampling ADC

Resolution

16 bits

Number of channels

32 differential or 64 single-ended, software selectable

Input ranges

±5 V, ±2.5 V, ±1.25 V, ±0.625 V, 0 to 5 V, 0 to 2.5 V, 0 to 1.25 V

(software programmable)

 

 

Polarity

Unipolar/bipolar, software selectable

A/D pacing

!

Internal counter – ASIC

(software programmable)

!

External source (A/D external pacer). The total number of sample clocks must be at least

 

 

5 greater than the total number of samples desired. This is required to accommodate the

 

 

pipelined architecture of the ADC.

 

!

Software polled

Burst mode

Software selectable option. Valid for a fixed input range only.

 

Burst rate = 667 nS.

A/D gate sources

!

External digital (A/D pacer gate)

 

! External analog (analog trigger in)

A/D gating modes

External digital: Programmable, active high or active low, level or edge

 

External analog: Software-configurable for:

 

! Above or below reference

 

! Positive or negative hysteresis

 

! In or out of window.

 

Trigger levels set by DAC0 and/or DAC1.

A/D trigger sources

!

External digital (A/D start trigger in and A/D stop trigger in)

 

! External analog (Analog Trigger In)

A/D triggering modes

! External digital: Software-configurable for rising or falling edge.

 

! External analog: Software-configurable for positive or negative slope. Trigger levels set

 

 

by DAC0 and/or DAC1.

 

! Pre-/post-trigger: Unlimited number of pre-trigger samples, 16 Meg post-trigger

 

 

samples. Compatible with both digital and analog trigger options.

Data transfer

!

From 8 k RAM buffer via DMA (demand or non-demand mode) using scatter gather.

 

!

Programmed I/O

Configuration memory

8 K words

Channel/gain queue

Up to 8 K elements. Programmable channel, gain, and offset.

A/D conversion time

500 nS

Calibration

Auto-calibration, calibration factors for each range stored on board in non-volatile RAM.

6-4

Page 25
Image 25
Measurement Specialties PCI-DAS64/M2/16 manual Specifications, Analog input specifications