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Major Changes from Rev. 2.0 to 2.1
LVDS = Low Voltage Differential
New Generator and Analyzer
HP 81200 Data Generator/Analyzer Platform User Guide, Revision 2.1
Major Changes from Rev. 2.0 to 2.1
On from revision 2.1, two new frontends are available for the HP 81200
Data Generator/Analyzer Platform.
Firmware commands have been added and the user interface has been
enhanced to support the capabilities of these frontends.
In addition, some new features have been implemented.
"Frontends E4838A and E4837A"
"Enhanced Frontend Support" on page 12
"External Clock Multiplier" on page 12
"Quick Frequency Overview and Change" on page 13
Frontends E4838A and E4837A
The main purpose of these frontends is to address the upcoming LVDS
technology. LVDS stands for Low Voltage Differential Signals.
There are two industry standards that define LVDS. The more common is
Signals
the general electrical layer standard defined by TIA, ANSI/TIA/EIA-644.
LVDS connections have the following characteristics:
Table 1
LVDS Specifications
Diff ampl = V
V
= (V
CM
OH
Typical termination
Sensitivity
Termination
Common mode range
The new frontends are:
Frontends
• E4838A, a differential output, low voltage amplitude/offset and variable
slopes generator, also called the "RAPID" (high data RAte PIn Driver)
frontend.
• E4837A, a differential input high sensitivity analyzer.
For details please refer to the HP 81200 Technical Specifications.
LVDS, GP
– V
0.25 to 0.4 V
OH
OL
+ V
) / 2
OL
What's New in This Release?
LVDS, LP
0.15 to 0.25V
1.2 ± 75 mV
Differential 100 τ
100 mV
100 τ , diff
0 to 2.4 V
11
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