PDF TMC3503 Data sheet ( Hoja de datos )

Número de pieza	TMC3503
Descripción	Triple Video D/A Converter 8 bit/ 80 Msps/ 5V
Fabricantes	Fairchild Semiconductor
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No Preview Available ! TMC3503 Triple Video D/A Converter 8 bit, 80 Msps, 5V www.fairchildsemi.com Features • 8-bit resolution • 80, 50, and 30 megapixels per second • ±0.5 LSB linearity error • Sync, blank, and white controls • Independent sync current output • 1.0V p-p video into 37.5Ω or 75Ω load • Enhancemenet of ADV7120 – Internal bandgap voltage reference – Double-buffered data for low distortion – Power-down sleep mode • Double-buffered data for low distortion • TTL-compatible inputs • Low glitch energy • Single +5 Volt power supply Applications • Video signal conversion – RGB – YCBCR – Composite, Y, C • Multimedia systems • Image processing • True-color graphics systems • Broadcast television equipment • High-Deﬁnition Television (HDTV) equipment • Direct digital synthesis Block Diagram SYNC BLANK WHITE [PLCC only] 8 G7-0 Description The TMC3503 is a high-speed triple 8-bit D/A converter especially suited for video and graphics applications. It offers 8-bit resolution, TTL-compatible inputs, low power consumption, a power-down sleep mode, and requires only a single +5 Volt power supply. It has single-ended current outputs, SYNC and BLANK control inputs, and a separate current source for adding sync pulses to any D/A converter output. WHITE and SLEEP control inputs are available on PLCC parts. It is ideal for generating analog RGB from digital RGB and driving computer display and video moni- tors. Three speed grades are available: 30, 50, and 80 Msps. The TMC3503 triple D/A converter is available in a 44-lead plastic J-leaded PLCC. It is also available in a 48-lead plastic LQFP package. It is fabricated on a sub-micron CMOS process with performance guaranteed from 0°C to 70°C. SYNC IOS 8 bit D/A Converter [LQFP only] IOG 8 B7-0 8 bit D/A Converter IOB 8 R7-0 8 bit D/A Converter SLEEP [PLCC only] CLOCK +1.235V Ref IOR COMP RREF VREF 65-3503-01 REV. 1.02 11/24/99 1 page PRODUCT SPECIFICATION TMC3503 Pin Descriptions (continued) Pin Name RREF Pin Number LQFP PLCC 36 42 Value 590 Ω COMP 34 40 0.1 µF Power, Ground VDD 12, 30, 31 17, 34–36 GND 1, 14, 15, 27, 28, 38, 39, 48 29–32 NC 13, 24, 25, — 37 Equivalent Circuits +5 V 0.0V — VDD Pin Function Description Current-setting Resistor. The full-scale output current of each D/A converter is determined by the value of the resistor connected between RREF and GND. The nominal value for RREF is found from: RREF = 9.1 (VREF/IFS) where IFS is the full-scale (white) output current (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 (ohms) on each D/A converter. VFS is the blank to full-scale voltage. Compensation Capacitor. A 0.1 µF ceramic capacitor must be connected between COMP and VDD to stabilize internal bias circuitry. Power Supply. Ground. No Connect VDD Digital Input p n np VDD GND 27014D GND Figure 2. Equivalent Digital Input Circuit Figure 3. Equivalent Analog Output Circuit OUT 27013B REV. 1.02 11/24/99 5 5 Page PRODUCT SPECIFICATION Notes: TMC3503 REV. 1.02 11/24/99 11 11 Page

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