Atec Agilent-346a - Manual (Page 36)

36
Designing and Probing with Target Connections
For All Agilent Logic Analyzers with 40-pin Pod Connectors
Low Density, Moderate Performance
Solutions shown in the
“High-Density, High-Performance”
(page 27) section of this docu-
ment can be used in place of the
solutions described here. Agilent
recommends standard 0.1 inch
center connectors for normal
density applications if the load-
ing/speed is not a significant
issue. Many of these items are
available from 3M or Agilent
(see Table 6). See the “Related
Information” section at the
end of this document for 3M
address information.
Direct Connection through
Isolation Adapter
Isolation adapters (Agilent part
number 01650-63203) that con-
nect to the end of the probe cable
are designed to perform two func-
tions. The first is to reduce the
number of pins required for the
header on the target board from
40 pins to 20 pins. This process
reduces the board area dedicated
to the probing connection. The
second function is to provide the
proper RC networks in a very
convenient package. Figure 7.3
illustrates how the isolation
adapter physically connects to
the target system and the equiva-
lent load of the isolation adapter
connected to an Agilent
Technologies logic analyzer.
Figures 7.4 and 7.5 show the
pinout diagrams for the probe
cable and the isolation adapter,
respectively. There are two
20-pin connectors, along with
their Agilent Technologies and 3M
part numbers, listed in Table 6.
Note: The Agilent 01650-63203
saves space by using a common
ground (see Figure 7.5). This will
impact signal fidelity, especially
faster transition times (< 4 - 5 ns).
Agilent Part Number 3M Part Number Connector Description
1251-8106 2520-6002 20-Pin, low-profile (straight)
1251-8473 2520-5002 20-Pin, low-profile (right-angle)
Table 6. Twenty-pin connectors for fixed configuration probing.
(Requires isolation adapter)
Isolation Adapter RC Network
k
100 k
Equivalent Load
Logic analyzer pod cable
Isolation Adapter
(Agilent 01650-63203)
20-pin connector
(Agilent 1251-8106)
Figure 7.3. Isolation adapter (01650-63203) and equivalent load