FMS3810KRC
FMS3810KRC Datasheet
FMS3810/3815
| Part | Datasheet |
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FMS3810KRC |
FMS3810KRC (pdf) |
| Related Parts | Information |
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FMS3810KRCT |
FMS3810KRCT |
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FMS3815KRC |
FMS3815KRC |
| PDF Datasheet Preview |
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| FMS3810/3815 Triple Video D/A Converters 3 x 8 bit, 150 Ms/s • 8-bit resolution • 150 megapixels per second linearity error • Sync and blank controls • 1.0V p-p video into or load • Internal bandgap voltage reference • Double-buffered data for low distortion • TTL-compatible inputs • Low glitch energy • Single +5 Volt power supply • Video signal conversion RGB YCBCR Composite, Y, C • Multimedia systems • Image processing • True-color graphics systems FMS3810/3815 products are low-cost triple D/A converters that are tailored to graphics and video applications where speed is critical. Two speed grades are available: FMS3810 FMS3815 100 Ms/s 150 Ms/s TTL-level inputs are converted to analog current outputs that can drive loads corresponding to doubly-terminated loads. A sync current following SYNC input timing is added to the IOG output. BLANK will override RGB inputs, setting IOG, IOB and IOR currents to zero when BLANK = L. Although appropriate for many applications the internal 1.235V reference voltage can be overridden by the VREF input. Few external components are required, just the current reference resistor, current output load resistors, and decoupling capacitors. Package is a 48-lead LQFP. Fabrication technology is CMOS. Performance is guaranteed from 0 to 70°C. Block Diagram SYNC BLANK SYNC 8 G7-0 8 bit D/A Converter 8 B7-0 8 bit D/A Converter 8 R7-0 CLOCK 8 bit D/A Converter +1.235V Ref IOR COMP RREF VREF FMS3810/3815 PRODUCT SPECIFICATION Functional Description Within the FMS3810/3815 are three identical 10-bit D/A converters, each with a current source output. External loads are required to convert the current to voltage outputs. Data inputs RGB7-0 are overridden by the BLANK input. SYNC = H activates, sync current from IOS for sync-on-green video signals. Digital Inputs All digital inputs are TTL-compatible. Data is registered on the rising edge of the CLK signal. Following one stage of pipeline delay, the analog output changes tDO after the rising edge of CLK. SYNC and BLANK SYNC and BLANK inputs control the output level Figure 1 and Table 1 of the D/A converters during CRT retrace intervals. BLANK forces the D/A outputs to the blanking level while SYNC = L turns off a current source that is connected to the green D/A converter. SYNC = H adds a 40 IRE sync pulse to the green output, SYNC = L sets the green output to Volts during the sync tip. SYNC and BLANK are registered on the rising edge of CLK. data 660 mV max. pedestal 54 mV sync 286 mV Figure Nominal Output Levels BLANK gates the D/A inputs and sets the pedestal voltage. If BLANK = H, the D/A inputs are added to a pedestal which offsets the current output. If BLANK = L, data inputs and the pedestal are disabled. D/A Outputs Each D/A output is a current source. To obtain a voltage output, a resistor must be connected to ground. Output voltage depends upon this external resistor, the reference voltage, and the value of the gain-setting resistor connected between RREF and GND. Normally, a source termination resistor of 75 Ohms is connected between the D/A current output pin and GND near the D/A converter. A 75 Ohm line may then be connected with another 75 Ohm termination resistor at the far end of the cable. This “double termination” presents the D/A converter with a net resistive load of Ohms. The FMS3810/3815 may also be operated with a single 75 Ohm terminating resistor. To lower the output voltage swing to the desired range, the nominal value of the resistor on RREF should be doubled. Voltage Reference All three D/A converters are supplied with a common voltage reference. Internal bandgap voltage reference voltage is Volts with a source resistance. An external voltage reference may be connected to the VREF pin, overriding the internal voltage reference. Ordering Information Product Number FMS3810KRC FMS3815KRC Conversion Rate 100 Ms/s 150 Ms/s Temperature Range TA = 0°C to 70°C TA = 0°C to 70°C Screening Commercial Package 48-Lead LQFP 48-Lead LQFP Package Marking 3810KRC 3815KRC DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 12/21/00 0.0m 003 Stock#DS30003810 2000 Fairchild Semiconductor Corporation |
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