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ISL55112IRTZ Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL55112IRTZ Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 20 page 10 FN6649.0 September 23, 2009 Application Information The ISL55112 2+2 CCD device provides four drivers for horizontal inputs of CCD arrays. It comprises two high capacitance drivers (H1/H2) and two low capacitive drivers for handling Reset Gate (RG)/Last H (HL) inputs of a CCD device. From an applications and physical routing standpoint, the H1/H2 (high current drivers) have identical circuitry. Likewise, the HL/RG (low current drivers) circuitry is the same internally. In dual device applications, the user is free to swap driver outputs to accommodate layout requirements. The ISL55112 H1/H2 have fast rise / fall times into large capacitive loads. H1/H2 are designed with short propagation delays and tightly controlled skew, allowing the device to be used on large, fast CCD arrays, used in image processing applications Supply Voltages The ISL55112 has three types of pins when it comes to supply voltages: Logic, driver rails and device bias connections. VDD and Ground Supply Connections The ISL55112 has a logic supply (VDD) that can be set from 2.7V to 5.5V. Hence the VDD supply voltage sets the operating thresholds for the digital inputs H1IN, H2IN, RGIN, HLIN, and EN pins are high speed digital logic connections. Typically they are logic connections coming from the master CCD timing generator. PD should have fast transitions, but should not run at frequencies above 1Hz. CCD Driver Rails Each of the four driver outputs has its own set of high and low rail supply connections. The positive rail connections for the drivers are RG_VP, HL_VP, H1_VP, H2_VP. The negative driver rail connections are RG_VN, HL_VN, H1_VN, H2_VN. (Note H1_VN = H2_VN and should always be at the same voltage). Once the user has defined the “Driver” amplitudes required by the CCD, Device bias connections, VPLUS and VSUB must be connected to the maximum and minimum voltage required. Device Bias connections VPLUS should be connected to the most positive voltage. VSUB should be connected to the most negative voltage. Accordingly, the VPLUS/ VSUB connections can only be determined once the CCD device driver output amplitude requirements have been determined. Dual Video CCD Connection Considerations Physical placement that keeps series inductance to a minimum is important. The ISL55112 design accommodates dual device placement close to a CCD device. H1 / H2 and RG / HL drivers are internally identical. The user can rotate the device for PCB placement close to a single CCD with dual-video requirements. Power Supply Sequencing The ISL55112 substrate is connected to the VSUB Pin. Positive Protection is connected to the VPLUS pin. The system supply GND connection will always be present, and is the reference to all other supply voltages. Therefore apply VDD, VPLUS, VSUB followed by the VP, VN busses. Digital inputs should be driven as soon as all CCD Array with Dual Video Outputs 19 18 17 15 14 13 1 2 3 4 5 6 7 RGIN H1IN H2IN HLIN RGOUT HLOUT H1OUT H2OUT RGIN H1IN H2IN HLIN HLOUT RGOUT H1OUT H2OUT 7 6 5 4 3 2 1 13 14 15 17 18 19 RG_VP RG_VN RG_VP RG_VN HL_VP HL_VN HL_VN HL_VP HXVP HXVP 3.3V 3.3V PIN 12 (VSUB) PIN 12 (VSUB) FIGURE 4. SYMMETRY ACCOMMODATES DUAL DEVICE UTILIZATION WITH A DUAL VIDEO CCD DEVICE ISL55112 |
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