Analog Controls - LeCroy Waverunner2 Series Service Manual

4.2.5 µP Control
Control between the microprocessor and the main board is accomplished via the
RPM. The RPM functions are:
• Processor interface
• MAM interface
• 8 bit bus interface (MTB411, MCG426, MST429A, IIC)
• Serial interface
• Min-Max Computation
• Histogram
• RPM is configured at boot up by the processor. The RPM configuration program
is stored in the flash memory.
4.2.6 Trigger
The different trigger couplings are :
• DC
• AC
• LF REJ
• HF REJ
• HF

Analog Controls

A sample and hold fed by the precision DAC provides the threshold levels. A
precision DAC is also used for a successive approximation ADC which measures
Probus inputs, temperature, etc.
4.2.7 Analog to Digital Converter
Introduction
The analog to digital converter system does the signal conversion to 8 bits, using
the following circuits:
• HSY632: Hybrid switching AMP 2 in 4 out.
• HAM631: Hybrid ADC 1GS/s with 4Mb memory. Provide 83 MHz clock for
memory and refresh for DRAM
4-16 Theory of Operation
: cut off frequency is almost 7.5 Hz.
: single pole high pass filter with a cut off frequency at 50
kHz.
: single pole low pass filter with a cut off frequency at 50 kHz.
: frequency divider by four.