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CDK3400CTQ48 Datasheet(PDF) 7 Page - Cadeka Microcircuits LLC. |
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CDK3400CTQ48 Datasheet(HTML) 7 Page - Cadeka Microcircuits LLC. |
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7 / 11 page  ©2008 CADEKA Microcircuits LLC www.cadeka.com 7 Data Sheet Current-Setting Resistor - RREF Full-scale output current of each D/A converter is deter- mined by the value of the resistor connected between RREF and GND. Nominal value of RREF is found from: RREF = 9.1 (VREF/IFS) where IFS is the full-scale (white) output current (in amps) from the D/A converter (without sync). Sync is 0.4 * IFS. D/A full-scale (white) current may also be calculated from: IFS = VFS/RL Where VFS is the white voltage level and RL is the total resistive load (Ω) on each D/A converter. VFS is the blank to full-scale voltage. Voltage Reference All three D/A converters are supplied with a common voltage reference. Internal bandgap voltage reference voltage is +1.235V with a 3kΩ source resistance. An external voltage reference may be connected to the VREF pin, overriding the internal voltage reference. A 0.1µF capacitor must be connected between the COMP pin and VDD to stabilize internal bias circuitry and ensure low-noise operation. Voltage Reference Output/Input - VREF An internal voltage source of +1.235V is output on the VREF pin. An external +1.235V reference may be applied here which overrides the internal reference. Decoupling VREF to GND with a 0.1µF ceramic capacitor is required. Power and Ground Required power is a single +5.0V supply. To minimize power supply induced noise, analog +5V should be connected to VDD pins with 0.1µF and 0.01µF decoupling capacitors placed adjacent to each VDD pin or pin pair. The high slew-rate of digital data makes capacitive cou- pling to the outputs of any D/A converter a potential problem. Since the digital signals contain high-frequency components of the CLK signal, as well as the video out- put signal, the resulting data feedthrough often looks like harmonic distortion or reduced signal-to-noise perfor- mance. All ground pins should be connected to a common solid ground plane for best performance. |
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