LeCroy WaveSurfer 400 Series User Manual

20MHz &
200MHz
Bandwidth
Limiter
CHx GAIN
Offset adjust control
to ADC system
CHx TRIG SIG
CHx GND
Differencial signal for Trigger Comparator
Differencial amplifier
Variable gain control
Differencial
500mVpp full scale
OffsetGain
Differencial amplifier
Bandwidth
Limiter
*CHxa SIG
CHxa SIG
Differencial amplifier
CHx SIG
Variable gain amplifier
CHx OS ADJ
to ADC system
CHxb SIG
from Front End input
*CHxb SIG
Bandwidth limiter for
DC calibration
SA5209D
Bandwidth
Limiter
*CHx TRIG SIG
Figure 4-4 Front End Block Diagram 2
4.2.2 Analog to Digital Converter
The analog to digital converter system does the signal conversion to 8 bits, using
the HAM631:
The system has the relay switchyard to combine the input channels.
• HAM631
Hybrid ADC 1GS/s with 4Mb memory. It consists of MAD442 and MAM633.
Provide 83 MHz clock for memory and refresh for DRAM.
Analog Control voltage
Circuit name signal level Signal name
CHx ADGAN 0 to +4V Adjust ADC gain (+/-15%)
CHx ADOFS 0 to +4V Adjust ADC offset (+/-100mV)
CHx ADDLY 0 to +4V Adjust ADC sampling delay (+/-250ps)
These are mainly used on channel combine mode.
ADC Sampling Clock
MAM633
ADC Offset Adjustment
MAD442
2
PCI
Card
2
HAM631
SYSCLK
MAM633 Control
CHx ADGAN
CHx ADC SIG
ADC Sampling Delay
Adjustment
CHx ADOFS
1GS/s 8bit
ADC
4MB
Aquisition
Memory
CHx SHCK
CHx ADDLY
ADC Gain Adjustment
2
8bit Data Bus
MAIN BOARD
83MHz System Clock
for DRAM
Figure 4-5 HAM631 System Architecture
Theory of Operation 4-5

LeCroy WaveSurfer 400 Series Specifications

General

Brand	LeCroy
Model	WaveSurfer 400 Series
Category	Test Equipment
Language	English