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Appendix A
Device-Specific Information
DAQPad-6020E Block Diagram
Voltage
REF
(8)
Analog
Mux Mode
Selection
Muxes
Switches
(8)
Calibration
Mux
PFI / Trigger
Timing
Digital I/O (8)
DAC0
DAC1
Connecting Signals to the DAQPad-6020E BNC
E Series User Manual
Figure A-22 shows a block diagram of the DAQPad-6020E.
Calibration
DACs
4
+
12-Bit
NI-PGIA
Sampling
Gain
Amplifier
Converter
–
Dither
Circuitry
Configuration
Memory
Analog Input
Trigger
Timing/Control
Counter/
DAQ - STC
Timing I/O
Analog Output
Digital I/O
Timing/Control
AO Control
Data (16)
Calibration
DACs
6
Figure A-22. DAQPad-6020E Block Diagram
Analog Input
You can use each analog input BNC connector for one differential signal or
two single-ended signals.
Differential Signals
To connect differential signals, determine the type of signal source you are
using: a floating signal source or a ground-referenced signal source. Refer
to the
Differential Connection Considerations
Input Signals
sections of Chapter 2,
To measure a floating signal source, move the switch to the FS position. To
measure a ground-referenced signal source, move the switch to the GS
ADC
A/D
FIFO
Transceivers
AI Control
IRQ
Interrupt
Analog
Request
Input
Control
Bus
DAQ-STC
Interface
Bus
Interface
Analog
Output
Control
Analog
A-26
Bus
USB
Data
Interface
Port
USB Micro
Controller
Interrupt
EEPROM
Request
Control
EEPROM
1
EEPROM
Control
DAQ-PnP
Bus
Interface
1 A Fuse
5 V
Supply
and
Connecting Analog
Input, for more information.
2
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