LUPA-1300_09 Datasheet, PDF (13/32 Pages) Cypress Semiconductor – 1.3MPxl High Speed CMOS Image Sensor

LUPA-1300
Table 7. Power supplies used in the LUPA design
Name
Vdda
Vdd
Voo
Vstable
Max current
50 mA
20 mA
85 mA
6 mA
Typ.
5V
5V
5V
5.5V
Max
6V
Vpix
Vddr
Vres
VmemH
VmemL
200 mA
4.5V
6V
20 mA
5V
50 mA
6V
50 mA
6V
50 mA
4.5V
Description
Power supply column readout module
Power supply digital modules
Power supply output stages
Power supply output stages. Decouples noise on the Voo
supply from the output signal.
Power supply pixel array.
Power supply logic for drivers
Power supply to reset the pixels
Power supply for high DC level Vmem
Power supply for low DC level Vmem
The maximum currents mentioned in Table 7 are peak
currents. The power supplies need to be able to deliver these
currents especially the maximum supply current for Vpix.
It is important to notice that we don't do any power supply
filtering on chip and that noise on these power supplies can
contribute immediately to the noise on the signal. Especially
the voltage supplies Vpix and Vdda are important to be well
noise free. With respect to the power supply Voo, a special
decoupling is used, for which an additional power supply
Vstable is required
Figure 11a. Schematic of typical decoupling of power supply (source current)
Figure 11b. Schematic of typical decoupling of power supply (source current)
Notes
10. At start up the Vpix supply draws a very high current (> 300 mA) which has to be limited (max. 200 mA) otherwise the bond wires of the particular supply will
be destroyed. One should make sure that the Vpix power supply limits the current draw to the Vpix sensor supply pins to max. 200 mA. When the bond wires
of Vpix are destroyed the sensor isn't operating normally and will not meet the described specifications.
11. VmemL must sink a current, not source it. All power supplies should be decoupled very close to the sensor pin (typical 100nF to filter high frequency dips and
10 microF to filter slow dips). A typical decoupling circuit is shown in the figure below. Vres_ds must be able to sink and source current.
Document Number: 38-05711 Rev. *C
Page 13 of 32
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