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Evaluation Kit User Manual
EV9000
2001 Consumer Microcircuits Limited
16
UM9000/2
K2
K3
-1
+
K1
+
2
Rx
Modem
A
Personality
Card
K4
v1
E3
v3
v2
sw1
sw2
E2
NSA2
NSA1
RXINA
+
-
BIAS
o/c
Figure 6: Channel A Receive Path
Element Purpose
Component
Designator
Approximate
Range
v1
Used to bias the input signal applied to K4 to a nominal
mean dc level of V
BIAS
(=½ of +5VM).
R17
-5V to 5V
v2
Bias corresponding to DC offset #1 software selection.
This allows the user to preset the bias introduced when
the software DC offset #1 is activated.
R15
-5V to 5V
v3
Bias corresponding to DC offset #2 software selection.
This allows the user to preset the bias introduced when
the software DC offset #2 is activated.
R16
-5V to 5V
K1
Gain adjustment on receive data input, RXINA
R14
0.5 to 5
K2
Gain adjustment on noise signal input #1, NSA1
R19
0.5 to 5
K3
Gain adjustment on noise signal input #2, NSA2
R18
0.5 to 5
K4
Gain adjustment on composite receive input to modem.
This is generally used to achieve the proper input
signal level to the modem.
R25
0.5 to 5
sw1
Software controlled switch which reflects the software
selection of which noise source is injected.
not applicable not applicable
sw2
Software controlled switch which reflects the software
selection of DC offset.
not applicable not applicable
E2
Jumper to select choice of ac or dc injected noise
coupling. Jumper installed for dc coupling.
E2 not
applicable
E3
Jumper to select whether input signal is inverted.
Jumper position A for invert.
E3 not
applicable
Table 8: Channel A Receive Path Adjustments and Controls
-1
TXOUTA
Modem
A
E4
TXout
+
v4
Personality
Card