LUPA-1300 CYPRESS [Cypress Semiconductor], LUPA-1300 Datasheet - Page 45

• Manufacturer Part Number: LUPA-1300
• Description: 1.3 M Pixel High Speed CMOS Image Sensor
• Manufacturer: CYPRESS [Cypress Semiconductor]

8 Application notes & FAQ
Q: Can the LUPA-1300 directly drive an ADC?
A: Yes, coupling the LUPA-1300 to a set of 16 ADC’s close to the chip is the
preferred way of operation. A suitable ADC must have thus
Q: How does the dual slope extended dynamic range mode works?
A:
The green lines are the analog signal on the photodiode, which decrease as a result of
exposure. The slope is determined by the amount of light at each pixel (the more light
the steeper the slope). When the pixels reach the saturation level the analog signal
will not change despite further exposure. As you can see without any double slope
pulse pixels p3 and p4 will reach saturation before the sample moment of the analog
Cypress Semiconductor Corporation
Contact [e-mail]
• Input range equal or larger than the 1.2 V- 0 V sensor signal swing
• In view of the LUPA-1300’s S/N 10 bits are suitable. 11 or 12 bits may be
• Input capacitance 20 pF or lower (high output loads will limit the speed). And
• Sampling frequency 40 MHz (or the application specific sample rate)
• The ADC’s input bandwidth must be sufficiently higher than the sampling
LUPA-1300
Reset pulse
Datasheet
considered too.
no significant resistive loading.
frequency, in order to avoid RC contamination between successive pixels.
Total integration time
Double slope reset pulse
Figure 25: Dual slope diagram
Document # : 38-05711 Rev.**( Revision 3.1)
3901 North First Street
Read out
p1
p4
p2
p3
San Jose, CA 95134
Double slope reset time (usually 5-10% of the total
integration time)
Reset level 1
Reset level 2
Saturation level
Page 45 of 48
408-943-2600