Signal Descriptions
DAC Output
Board label:
DAC_OUT
Grid location:
H3
Description:
This is the output of the DAC at the end of the mixed signal chain. The DAC is driven from the port expander.
The DAC output is a sine wave. Since the output is not
fi
ltered, the digitizing levels are present in the output waveform.
The resulting DAC voltage is a sine wave with an amplitude 0 to 3 volts, and a period of 31 ms.
Figure 1: Mixed signal chain block diagram
Ethernet Bus
Board label:
, 10BaseT-, 1, 100BaseT-
Grid location:
C3, D3
Description:
These signals generate representative and compliant Ethernet traf
fi
c, but the board will not recognize or
communicate with any externally connected hardware. The following Ethernet Serial Bus signals are driven as differential
pairs:
The 10Base-T signal pair communicates at a 10 Mbit/s data rate.
The 100Base-TX signal pair communicates at 100 Mbit/s.
Fast Edge
Board label:
FAST_EDGE
Grid location:
A3
Description:
This is a 156 kHz, capacitively-coupled pulse signal with a 1.5 ns rise and fall time.
Fast FF Clock
Board label:
FAST_FF_CLK
Grid location:
C1
Description:
This is the 1.25 MHz clock input signal to a fairly fast
fl
ip-
fl
op. The pulse width of this clock signal varies slowly.
Tektronix MDO Demo 1 Board Instruction Manual
9
