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ADV476 Dataheets PDF



Part Number ADV476
Manufacturers Analog Devices
Logo Analog Devices
Description CMOS Monolithic 256x18 Color Palette RAM-DAC
Datasheet ADV476 DatasheetADV476 Datasheet (PDF)

a FEATURES Personal System/2* and VGA* Compatible Plug-in Replacement for INMOS 171/176 66 MHz Pipelined Operation Three 6-Bit D/A Converters 256؋18 Color Palette RAM RS-343A/RS-170 Compatible Outputs Blank on All Three Channels Standard MPU Interface Asynchronous Access to All Internal Registers ؉5 V CMOS Monolithic Construction Low Power Dissipation Standard 28-Pin, 0.6" DIP and 44-Pin PLCC APPLICATIONS High Resolution Color Graphics CAE/CAD/CAM Applications Image Processing Instrumentation De.

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a FEATURES Personal System/2* and VGA* Compatible Plug-in Replacement for INMOS 171/176 66 MHz Pipelined Operation Three 6-Bit D/A Converters 256؋18 Color Palette RAM RS-343A/RS-170 Compatible Outputs Blank on All Three Channels Standard MPU Interface Asynchronous Access to All Internal Registers ؉5 V CMOS Monolithic Construction Low Power Dissipation Standard 28-Pin, 0.6" DIP and 44-Pin PLCC APPLICATIONS High Resolution Color Graphics CAE/CAD/CAM Applications Image Processing Instrumentation Desktop Publishing AVAILABLE CLOCK RATES 66 MHz 50 MHz 35 MHz GENERAL DESCRIPTION CMOS Monolithic 256؋18 Color Palette RAM-DAC ADV476 FUNCTIONAL BLOCK DIAGRAM The ADV476 (ADV®) is a pin compatible and software compatible RAM-DAC designed specifically for VGA and Personal System/2 color graphics. The ADV476 is a complete analog output RAM-DAC on a single monolithic chip. The part contains a 256ϫ18 color lookup table, a pixel mask register as well as a triple 6-bit video D/A converter. The ADV476 is capable of simultaneously displaying up to 256 colors, from a total color palette of 262,144 addressable colors. The on-chip asynchronous MPU bus allows access to the color lookup table without affecting the input video data via the pixel port. The pixel read mask register provides a convenient way of altering the displayed colors without updating the color lookup table. The ADV476 is capable of generating RGB video output signals which are compatible with RS-343A and RS-170 video standards, without requiring external buffering. The ADV476 is fabricated in a +5 V CMOS process. Its monolithic CMOS construction ensures greater functionality with low power dissipation and small board area. The part is packaged in a 0.6", 28-pin DIP and a 44-pin PLCC. PRODUCT HIGHLIGHTS 1. Standard video refresh rates, 35 MHz, 50 MHz and 66 MHz. 2. Fully compatible with VGA and Personal System/2 color graphics. 3. Guaranteed monotonic. Integral and differential linearity guaranteed to be a maximum of ± 1 LSB. 4. Low glitch energy, 75 pV secs. *Personal System/2 and VGA are trademarks of International Business Machines Corp. ADV is a registered trademark of Analog Devices, Inc. REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 ADV476–SPECIFICATIONS Parameter STATIC PERFORMANCE Resolution (Each DAC) Accuracy (Each DAC) Integral Nonlinearity Full Scale Error Blank Level Offset Error DIGITAL INPUTS Input High Voltage, VINH Input Low Voltage, VINL Input Current, IIN Input Current (RD Input Only) Input Capacitance, CIN DIGITAL OUTPUTS Output High Voltage, VOH Output Low Voltage, VOL Floating-State Leakage Current Floating-State Output Capacitance ANALOG OUTPUTS Max Output Voltage Max Output Current DAC to DAC Matching2 Analog Output Capacitance CURRENT REFERENCE Input Current (IREF) Range Voltage at IREF POWER SUPPLY Supply Voltage, VCC Supply Current, ICC Power Supply Rejection Ratio DYNAMIC PERFORMANCE Clock and Data Feedthrough3, 4 Glitch Impulse3, 4 6 ± 0.5 ±5 ± 0.5 ± 0.5 2 0.8 ± 10 ± 100 7 2.4 0.4 ± 50 7 1.5 21 ± 2.5 10 –3/–10 VCC –3/VCC 4.5/5.5 220 6 (VCC = +5 V ؎ 10%, IREF = 8.88 mA. All Specifications TMIN to TMAX1 unless otherwise noted.) Units Bits LSB max % max LSB max LSB max V min V max µA max µA max pF typ V min V max µA max pF typ V min mA min % max pF typ mA min/mA max V min/V max V min/V max mA max %/V Guaranteed Monotonic Full Scale = 2.15 ϫ IREF ϫ RL, IREF = 8.39 mA BLANK = Logic Low BLANK = Logic High Test Conditions/Comments All Versions VCC = 5.5 V, VIN = 0.4 V to VCC VCC = 5.5 V, VIN = 0.4 V to VCC ISOURCE = 500 µA, VCC = 4.5 V ISINK = 5.0 mA, VCC = 4.5 V VCC = 5.5 V, 0.4 V < VIN < VCC IO < 10 mA, IO = 2.15 ϫ IREF VO ≤ 1 V BLANK = Logic Low IREF = 8.88 mA fMAX = 66 MHz IO = 2.15 ϫ IREF, D0–D7 Unloaded 4.5 < VCC < 5.5 V, IO = 2.15 ϫ IREF, RL = 37.5 Ω, CL = 30 pF, IREF = 8.88 mA. –35 75 dB typ pV secs typ NOTES 1 Temperature range (T MIN to TMAX); 0 to +70°C. 2 Relative to the midpoint of the distribution of the three DACs measured at full scale. 3 TTL input values are 0 to 3 volts, with input rise/fall times ≤3 ns, measured between the 10% and 90% points. Timing reference points at 50% for inputs and outputs. Analog output load ≤10 pF, 37.5 Ω. D0–D7 output load ≤50 pF. See timing notes in Figure 2. 4 Clock and data feedthrough is a function of the amount of overshoot and undershoot on the digital inputs. For this test, the digital inputs have a 1 k Ω resistor to ground and are driven by 74HC logic. Glitch impulse includes clock and data feedthrough, –3 dB test bandwidth = 2 ϫ clock rate. Specifications subje.


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