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| Multimedia ICs 3-channel 8-bit D / A converter BU3618K The BU3618K is an RGB 3-channel, 8-bit D / A converter CMOS IC featuring high speed and low power consumption. An internal reference voltage supply eliminates the need to provide an external reference voltage supply. *Applications CD karaoke sets Video-CDs, CD-Vs, *Features 1) 8-bit resolution. 2) Current output model. 3) Low power consumption. 4) High-speed operation enabled. 5) Internal reference voltage supply. 6) TTL input. *Block diagram DGND1 AGND1 2 DVDD1 11 10 9 8 7 6 5 4 3 IREF 1 R1 R2 R3 R4 R5 R6 R7 R0 G7 G6 G5 G4 G3 G2 G1 G0 B7 B6 12 13 14 LATCH 15 16 17 18 19 20 21 22 DECODER DECODER DECODER VREF 44 43 42 41 40 39 CURRENT CELL 38 37 LATCH CURRENT CELL 36 35 34 OUTR AVDDR AGNDR N.C. OUTG AVDDG AGNDG N.C. OUTB AVDDB AGNDB CURRENT CELL 23 B5 24 B4 25 B3 26 B2 27 DVDD2 LATCH 28 DGND2 29 B1 30 B0 31 CLK 32 AVDD2 33 VREF 1 Multimedia ICs BU3618K *Pin descriptions Pin No. I / O Pin name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Function Pin No. I / O Pin name 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Function -- -- I I I -- -- I I I I I I I I I I I I I I I IREF AGND1 R7 R6 R5 DGND1 DVDD1 R4 R3 R2 R1 R0 G7 G6 G5 G4 G3 G2 G1 G0 B7 B6 For connection of output current adjustment resistor, VREF output Analog ground 1 RED data input (bit 7, MSB) RED data input (bit 6) RED data input (bit 5) Digital ground 1 Digital power supply 1 RED data input (bit 4) RED data input (bit 3) RED data input (bit 2) RED data input (bit 1) RED data input (bit 0, LSB) GREEN data input (bit 7, MSB) GREEN data input (bit 6) GREEN data input (bit 5) GREEN data input (bit 4) GREEN data input (bit 3) GREEN data input (bit 2) GREEN data input (bit 1) GREEN data input (bit 0, LSB) BLUE data input (bit 7, MSB) BLUE data input (bit 6) I I I I -- -- I I I -- O -- -- O -- -- -- O -- -- -- O B5 B4 B3 B2 DVDD2 DGND2 B1 B0 CLK AVDD2 VREF AGNDB AVDDB OUTB N.C. AGNDG AVDDG OUTG N.C. AGNDR AVDDR OUTR BLUE data input (bit 5) BLUE data input (bit 4) BLUE data input (bit 3) BLUE data input (bit 2) Digital power supply 2 Digital ground 2 BLUE data input (bit 1) BLUE data input (bit 0, LSB) System clock Analog power supply 2 External capacitor connection pin (C = 0.1F) Analog ground B Analog power supply B BLUE output -- Analog ground G Analog power supply G GREEN output -- Analog ground R Analog power supply R RED output 2 Multimedia ICs BU3618K *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Analog power supply voltage Input voltage Output voltage Storage temperature Power dissipation Symbol DVDD AVDD VIN VOUT Tstg PD Limits - 0.5 ~ + 7.0 DVDD - 0.3 ~ DVDD + 0.3 - 0.5 ~ DVDD + 0.5 - 0.5 ~ DVDD + 0.5 - 55 ~ + 125 5001 Unit V V V V C mW 1 Reduced by 5mW for each increase in Ta of 1C over 25C. *Recommended operating conditions Parameter Digital power supply voltage Analog power supply voltage Transmission clock width Transmission clock low level width Setup time Hold time Input low level voltage Input high level voltage Operating temperature Symbol DVDD AVDD TCK TCKL TS TH VIL VIH TOPR Min. 4.5 4.5 25 10 8 8 0.0 2.2 - 20 Typ. 5.0 5.0 -- -- -- -- -- -- -- Max. 5.5 5.5 -- -- -- -- 0.8 VCC 75 Unit V V ns ns ns ns V V C *Electrical characteristics (unless otherwise noted, Ta = 25C, DVDD = AVDD = 5.0V) Parameter Current consumption Differential linearity error Integral linearity error RGB output full-scale voltage RGB output voltage ratio Output delay time Settling time Symbol ICC ED EL FS FSCR TD TSET Min. -- - 0.5 - 1.0 1.24 0 -- -- Typ. 33 -- -- 1.38 0.5 20 10 Max. 70 0.5 1.0 1.52 5.0 -- -- Unit mA LSB LSB V % ns ns CL = 15pF -- Conditions FCK = 40MHz, PREF = 2.2k RL = 150 PREF = 2.2k, RL = 150 3 Multimedia ICs BU3618K *Application example RREF RED INPUT 11 10 9 8 7 6 5 4 3 2 1 GREEN INPUT 12 13 14 LATCH 15 16 17 18 19 20 21 22 DECODER DECODER DECODER VREF 44 43 42 41 40 39 CURRENT CELL 38 37 LATCH CURRENT CELL 36 35 34 RL BLUE OUTPUT RL GREEN OUTPUT RL RED OUTPUT CURRENT CELL 23 BLUE INPUT CLK 24 25 26 27 LATCH 28 29 30 31 32 33 0.1F Fig. 1 4 Multimedia ICs BU3618K *Input / output circuits Pin No. Pin name Equivalent circuit 3~5 8 ~ 26 29 ~ 31 R0 ~ R7, G0 ~ G7 B0 ~ B7, CLK 36, 40, 44 OUTR, OUTG OUTB 33 1, 33 IREF, VREF 1 *Circuit operation CLK TCK TCKL 50% TS TH DATA 50% TSET 90% RGBOUT 50% 50% TD Fig. 2 Input / output interface timing 5 Multimedia ICs BU3618K *External dimensions (Units: mm) 14.0 0.3 10.0 0.2 33 23 22 14.0 0.3 10.0 0.2 34 44 12 1 2.15 0.1 0.05 11 0.15 0.1 0.8 0.35 0.1 QFP44 6 1.2 0.15 |
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