Chapter 5 Specifications; Analog Input; Timing And Throughput - Measurement Computing PCI-DAS4020/12 User Manual

Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input

A/D converter type
Resolution
Programmable ranges
Number of channels
Connection
Bandwidth
Coupling
Input leakage current
Input impedance
Absolute maximum input voltage

Timing and throughput

Simultaneous sampling
A/D Convert clock source
A/D Gate source
A/D Gate modes
A/D Start Trigger (TRIG1)
A/D Stop Trigger (TRIG2)
A/D Triggering modes
Pre-trigger mode
Table 1. Analog input specifications
AD9225, 25 MSPS pipelined A/D
12-bits
±5 V, ±1 V
4 single-ended, independent ADC's per channel
4 independent BNC
17 MHz typical
DC
2 uA typ, 10 uA max
1.5 Mohm typ, or 50 ohm, selectable
(coaxial cable termination)
±15 V
Table 2. Timing and throughput specifications
Software selectable option - 1, 2, or 4 channels
Internal:
 On-card crystal oscillator
 Frequency: 40 MHz
 Frequency accuracy: 50% duty cycle, 50 ppm
External:
 Trig/Ext Clk BNC, or A/D External Clock on the 40-pin connector
 24-bit internal pre-scale counter (min pre-scale = 2)
 Clock Rate: 40 MHz max, 2 kHz min
 Duty Cycle: 50% ± 5%
Digital: Trig/Ext Clk BNC or A/D Pacer Gate on 40-pin connector
Analog: Any of the four input channels
Digital: Programmable active high/low, level/edge
Analog: Above/below reference, positive/negative
Hysteresis, inside/outside window
Resolution: 12-bit
Slew rate: 10V/sec. minimum
Software: Using a DAQ start command.
Digital: Trig/Ext Clk BNC, A/D Start Trigger In (on the 40-pin connector)
Analog: Any of the four input channels
Digital: Trig/Ext Clk BNC, A/D Stop Trigger In (on the 40-pin connector)
Analog: Any of the four input channels
Digital: Programmable rising or falling edge
Analog: Trigger above/below reference
Resolution: 12-bit
Unlimited number of pre-trigger samples, 16 Meg post-trigger samples.
Compatible with both digital and analog trigger/gate options. Data acquisition
initiated via TRIG1. Post-trigger phase initiated via TRIG2.
22
Chapter 5