11 / 38 page
LUPA-4000
Document Number: 38-05712 Rev. *B
Page 11 of 38
Setting of the ADC reference voltages
Figure 7. In- and external ADC connections
The internal resistor RADC has a value of approximately 300Ω.
This results in the values for the external resistors:
The values of the resistors depend on the value of RADC. The
voltage difference between ADC_VLOW and ADC_VHIGH
should be at least 1.0V to assure proper working of the ADC.
Synchronous shutter
In a synchronous (snapshot) shutter light integration takes
place on all pixels in parallel, although subsequent readout is
sequential.
Figure 8. Synchronous shutter operation
RHIGH_ADC
2.5V
REF_LOW ~ 1 V
REF_HIGH ~ 2 V
RLOW_ADC
RADC
external
internal
external
Resistor
Value (
Ω)
RADC_VHIGH
75
RADC
300
RADC_VLOW
220
Resistor
Value (
Ω)
Time axis
Line number
Integration time
Burst Readout time
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