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Chapter 4
Signal Connections
©
National Instruments Corporation
4-7
6711/6713/6715 User Manual
Analog Output Signal Connections
The analog output signals are DAC<0..7>OUT, AOGND, and EXTREF.
DAC0OUT is the voltage output signal for analog output channel 0.
EXTREF is the external reference input for all analog output channels. You
can use this input to reduce the voltage swing on the DAC outputs while
preserving the dynamic range. For example, with internal reference the
minimum change (LSB) on a voltage output is:
PFI5/UPDATE*
DIO
—
Vcc +0.5
3.5 at
(Vcc -0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI6/WFTRIG
DIO
—
Vcc +0.5
3.5 at
(Vcc -0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI7
DI
—
Vcc +0.5
3.5 at
(Vcc -0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI8/GPCTR0_SOURCE
DIO
—
Vcc +0.5
3.5 at
(Vcc -0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI9/GPCTR0_GATE
DIO
—
Vcc +0.5
3.5 at
(Vcc -0.4)
5 at 0.4
1.5
50 k
Ω
pu
GPCTR0_OUT
DO
—
—
3.5 at
(Vcc -0.4)
5 at 0.4
1.5
50 k
Ω
pu
FREQ_OUT
DO
—
—
3.5 at
(Vcc-0.4)
5 at 0.4
1.5
50 k
Ω
pu
1
The +5 V line on the connector of the DAQCard-6715 is fused at 0.75 A, however, the actual current available can be
limited below this value by the host computer. National Instruments recommends limiting current from this line to 250 mA.
AI = Analog Input, DIO = Digital Input/Output, pu = pull-up, AO = Analog Output, DO = Digital Output
The tolerance on the 50 k
Ω
pull-up and pull-down resistors is very large. Actual value may range between 17 and 100 k
Ω
.
Table 4-2.
I/O Signal Summary for the 6711/6713 Device (Continued)
Signal Name
Signal
Type and
Direction
Impedance
Input/
Output
Protection
(Volts)
On/Off
Source
(mA at V)
Sink
(mA
at V)
Rise
Time
(ns)/
Slew
Rate
Bias
20 V
4096
------------
4.88 mV
=
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