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PI3042A Datasheet(PDF) 8 Page - AMI SEMICONDUCTOR |
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PI3042A Datasheet(HTML) 8 Page - AMI SEMICONDUCTOR |
8 / 18 page Preliminary PI3042A datasheet (4) Up is the uniformity specification, measured under a uniform exposing light exposure. Up = [Vp(max) - Vpavg] / Vpavg x 100% or [Vpavg - Vp(min)] / Vpavg} x 100%, whichever is greater. Where Vp(max) is the maximum pixel output voltage in the light. Vp(min) is the minimum pixel output voltage in the light. The pixel Vp(n) is one nth pixel in Npixels in the sensor. (5) Vd = Vp(n)/Npixels. Where Vp(n) is the pixels signal amplitude of the nth pixel of the sensor. Dark is where light is off, leaving the image surface unexposed. (6) Ud = Vdmax – Vdmin. (7) Upadj = MAX[ | (Vp(n) - Vp(n+l) | / Vp(n)) x 100%. Upadj is the nonuniformity in percentage. It is the amplitude difference between two neighboring pixels. (8) Ucc is the uniformity specifications, measured among the good die on the wafer. Under uniform light exposure the sensors are measured and calculated with following algorithm: Vpavg of all the good dies on the wafer are averaged and assigned VGpavg. Then the die with maximum Vpavg is assigned Vpavg(max), and the one with minimum Vpavg is assigned Vpavg(min). Then UCC = {[Vpavg(max)-Vpavg(min)]/VGpavg}x100. Measuring The Device’s High Frequency Performances The PI3042A devices were tested on an A6 length standard CIS module’s PCB. Thirteen sensors bonded on the PCB board along with its support circuits, such as, clock buffer circuits, the shunt switch, SW, and its amplifier. The board’s video line capacitance, input capacitance of SW and input capacitance of the amplifier become part of the CAP. The A6 PCB was selected because together with the shunt switch, SW, and with its amplifier input, the video line had a typical value of ~100pf including its stray from its PCB copper traces. Another reason for this selection is that the PI3042A wafer probe tests of these devices are similarly setup using this method. By removing RIN, the amplifier gain was set to one. Then with the total value of CAP at ~100pf the Video Pixels Voltage amplitude gives a measure of the approximate Pixel charge. Note the amplifier is a 1:1 buffer amplifier that serves to isolate the video line from the measuring instruments. Further note that when the modules are produced, RIN is in the circuit as variable resistor. Then, in production of the CIS modules, the video output amplitude, Vpavg, can be adjusted to the module’s specified level. This factory adjust is required because the exposure is fixed (Exposure = Light Power X Time). Example, the module’s light power is fixed and integrations time, Tint, is fixed. Note Tint is fixed in accordance to users requirement, or specified for factory adjustment procedure during production. In either case, the light exposure is fixed. Accordingly, to adjust the voltage amplitude to the specified level, RIN is used. Since the sensor response vary as a function of color, the PI3042A is measured with a Yellow-Green LED light source, as well as, the Red (660 nm) LED light source. The light sources were selected because historically, these LED light bars were used in the CIS industry and accepted in the low-cost CIS markets. Today, the users are turning towards the Light Guides or Light Pipes as the costs have been reducing and the image sensor’s technology continually improves. Yet, in low-cost applications and, especially in mid-size volume production, the light bars and the older image sensors persistently continues to be in demand by the scanning industry. Page 8 of 18 Date: 09/23/05 |
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