Model CPCI32FF
32 Channel CPCI Board
User Manual
4
1784 Chessie Lane, Ottawa, Illinois 61350
•
Tel: 800/252-7074, 815/434-7800
•
FAX:815/434-8176
e-mail: [email protected]
•
Web Address: http://www.freqdev.com
The only user configuration on the CPCI32FF is
Jumper J1
(Figure 2)
, to select the ground reference to
the analog circuitry. Jumper J1 allows the analog common of the channel path to float, be referenced to
the front panel chassis ground, or be connected to the CPCI back plane power supply return. The best
noise performance is obtained by jumpering the Analog Common with the CPCI back plane return.
J1 Jumper
Detail from Figure 1
NC
CHASSIS
GND
ANALOG
COMMON
CPCI BP
RETURN
Default J1 jumper
configuration
Figure 2
J1 Jumper Configuration
After the J1 jumper has been configured, the CPCI32FF is ready for installation in a CPCI system.
Figure 3
identifies a typical channel for single ended input and differential output configuration.
+ Hi
- Lo
Differential
Analog
output
Analog Filter
D74L4B
+
_
INA111
3 Amplifier
differential
gain block
+ Hi
- Lo
INA111 Burr Brown
Detail
Hi
+
-
Lo
_
+
_
+
GAIN
SET
CPCI32FF ANALOG COMMON
DAC Board GROUND SENSE
FREQUENCY DEVICES 32 CHANNEL CPCI SIG. COND. CARD
Typical 16 CHANNEL DAC card
CHASSIS
GROUND
CPCI BP
GROUND
Either of these two
grounds can be
connected to analog
common on the card
via a jumper, J1.
Default is CPCI BP
Ground for lowest
noise.
BUFFERS,
ETC.
DAC
OUTPUT RETURN A or B
OUT_RTN_A = Even
OUT_RTN_B= Odd
Figure 3
Block Diagram of a Typical Channel
