PDF TDA8777 Data sheet ( Hoja de datos )

Número de pieza	TDA8777
Descripción	Triple 10-bit video DAC up to 330 MHz sample frequency
Fabricantes	NXP Semiconductors
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No Preview Available ! TDA8777 www.DataSheet4U.com Triple 10-bit video DAC, up to 330 MHz sample frequency Rev. 03 — 15 August 2005 Preliminary data sheet 1. General description The TDA8777 consists of three separate 10-bit video Digital-to-Analog Converters (DACs) with complementary outputs. They convert the digital input signals into analog current outputs at a maximum conversion rate of 330 MHz. The DACs are based on current source architecture. A sync pulse can be added to the green signal (sync-on-green) to allow devices driven by the video DAC to be synchronized. The TDA8777 has a Power-down mode to reduce power consumption during inactive periods. The TDA8777 is fabricated in a CMOS process that ensures high functionality with low power dissipation. 2. Features s Triple 10-bit DAC s Sampling frequency up to 330 MHz s Internal voltage reference (1.21 V) s Complementary outputs s Direct drive of double terminated 75 Ω load into standard level s TTL compatible input s Sync and blank control inputs s Analog output current source s Power-down mode s 3.3 V power supply s LQFP48 package 3. Applications s PC video cards s High resolution image processing s Digital video systems s General purpose high-speed digital-to-analog conversion 1 page Philips Semiconductors TDA8777www.DataSheet4U.com Triple 10-bit video DAC, up to 330 MHz sample frequency Table 3: Symbol B3 B4 B5 B6 B7 B8 B9 CLK VSSA1 VSSA2 OUTB OUTB VDDA2 VDDA3 OUTG OUTG OUTR OUTR COMP VREF RSET PSAVE R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 Pin description …continued Pin Description 17 blue digital input data; bit 3 18 blue digital input data; bit 4 19 blue digital input data; bit 5 20 blue digital input data; bit 6 21 blue digital input data; bit 7 22 blue digital input data; bit 8 23 blue digital input data; bit 9 (MSB) 24 clock input 25 analog supply ground 1 26 analog supply ground 2 27 complementary blue current analog output 28 blue current analog output 29 analog supply voltage 2 30 analog supply voltage 3 31 complementary green current analog output 32 green current analog output 33 complementary red current analog output 34 red current analog output 35 compliance voltage output 36 voltage reference input 37 full-scale current control resistor pin 38 power-save control input (active LOW) 39 red digital input data; bit 0 (LSB) 40 red digital input data; bit 1 41 red digital input data; bit 2 42 red digital input data; bit 3 43 red digital input data; bit 4 44 red digital input data; bit 5 45 red digital input data; bit 6 46 red digital input data; bit 7 47 red digital input data; bit 8 48 red digital input data; bit 9 (MSB) 8. Functional description This triple 10-bit video DAC is designed to convert digital input signals into analog output currents. All inputs (clock, data, blank and sync) must be TLL levels. 8.1 Voltage reference The voltage reference input to pin VREF should be 1.21 V. For correct operation, a 100 nF capacitor should be connected between pin VREF and pin VDDA. TDA8777_3 Preliminary data sheet Rev. 03 — 15 August 2005 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. 5 of 18 5 Page Philips Semiconductors TDA8777www.DataSheet4U.com Triple 10-bit video DAC, up to 330 MHz sample frequency 0 SFDR (dB) −20 001aad428 0 SFDR (dB) −20 001aad429 −40 −40 −60 −60 −80 1 10 102 fOUT (MHz) Sampling frequency = 240 MHz Fig 9. SFDR as a function of fOUT, typical values. −80 1 10 102 fOUT (MHz) Sampling frequency = 330 MHz. Fig 10. SFDR as a function of fOUT, typical values 560 Ω VDDA 48 47 46 45 44 43 42 41 40 39 38 37 G0 1 G1 2 VREF 36 COMP 0.1 µF 35 G2 3 34 OUTR G3 4 OUTR 33 G4 5 OUTG 32 G5 6 G6 7 TDA8777 OUTG 31 30 VDDA3 G7 8 29 VDDA2 G8 9 OUTB 28 G9 BLANK SYNC 10 11 12 27 OUTB VSSA2 26 25 VSSA1 13 14 15 16 17 18 19 20 21 22 23 24 VDDA Fig 11. Application diagram 001aaa890 TDA8777_3 Preliminary data sheet Rev. 03 — 15 August 2005 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. 11 of 18 11 Page

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