PCI30FG User Manual
Eagle Technology © Copyright 2002 12
Signal Definitions
This sections deal with all the signals abbreviations.
Signal Description
CHAN0-31 Analog input channel
DAC0-3 Analog output channel
SENSE0-3 Sensing line for analog output channel
PA0-7 Port A on PPI
PB0-7 Port B on PPI
PC0-7 Port C on PPI
CNT0-2 User counter clock input
COUT0-2 User counter clock output
CGTE0-2 User counter gate
CLK2 Internal counter input
OUT2 Internal counter output
Table 3-4 Signal definitions
Analog Input
Analog signals are connected either as single ended or differential inputs.
Single Ended Inputs
With single ended inputs, connections share a common low reference that is
connected to analog ground. See figure below.
The advantage of such a connection is that you have a maximum number of
inputs. Its major disadvantage is the loss of common mode rejection
obtainable from differential mode. Single ended inputs are very sensitive to
noise lead lengths should be kept as short as possible.
OVERLOADING ANY ANALOGUE INPUT
BY MORE THAN 10% MAY CAUSE OTHER
INPUT CHANNELS TO BECOME
INACCURATE OR NOISY. FOR PCI30FG
INPUTS OPERATING AT MAXIMUM GAIN,
THIS CORRESPONDS TO AN INPUT
VOLTAGE OF 5.5 mV.
