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 •Video-CDs, CD-Vs, CD karaoke sets •1)Features 8-bit resolution. 4) High-speed operation enabled. 5) Internal reference voltage supply. 6) TTL input. 2) Current output model. 3) Low power consumption. 19 G0 20 B7 21 B6 22 R2 R3 R4 DVDD1 DGND1 R5 R6 R7 AGND1 IREF CURRENT CELL 23 24 25 26 27 28 29 30 31 32 33 VREF G1 CURRENT CELL AVDD2 18 CURRENT CELL CLK G2 VREF B0 17 1 B1 G3 2 DGND2 16 3 LATCH G4 4 LATCH 15 5 LATCH G5 6 DVDD2 14 7 B2 G6 8 DECODER DECODER DECODER 13 9 B3 G7 10 B4 12 11 B5 R0 R1 •Block diagram 44 OUTR 43 AVDDR 42 AGNDR 41 N.C. 40 OUTG 39 AVDDG 38 AGNDG 37 N.C. 36 OUTB 35 AVDDB 34 AGNDB 1 Multimedia ICs BU3618K •Pin descriptions Pin No. I / O Pin name Function Pin No. I / O Pin name Function For connection of output current adjustment resistor, VREF output 23 I B5 BLUE data input (bit 5) Analog ground 1 24 I B4 BLUE data input (bit 4) RED data input (bit 7, MSB) 25 I B3 BLUE data input (bit 3) R6 RED data input (bit 6) 26 I B2 BLUE data input (bit 2) R5 RED data input (bit 5) 27 — DVDD2 Digital power supply 2 Digital ground 1 28 — DGND2 Digital power supply 1 29 I B1 BLUE data input (bit 1) R4 RED data input (bit 4) 30 I B0 BLUE data input (bit 0, LSB) 31 I CLK — AVDD2 Analog power supply 2 External capacitor connection pin (C = 0.1µF) 1 — IREF 2 — AGND1 3 I R7 4 I 5 I 6 — DGND1 7 — DVDD1 8 I Digital ground 2 9 I R3 RED data input (bit 3) 10 I R2 RED data input (bit 2) 32 11 I R1 RED data input (bit 1) 33 O VREF 12 I R0 RED data input (bit 0, LSB) 34 — AGNDB 13 I G7 GREEN data input (bit 7, MSB) 35 — AVDDB Analog power supply B 14 I G6 GREEN data input (bit 6) 36 O OUTB BLUE output 15 I G5 GREEN data input (bit 5) 37 — N.C. 16 I G4 GREEN data input (bit 4) 38 — AGNDG 17 I G3 GREEN data input (bit 3) 39 — AVDDG Analog power supply G 18 I G2 GREEN data input (bit 2) 40 O OUTG GREEN output 19 I G1 GREEN data input (bit 1) 41 — N.C. 20 I G0 GREEN data input (bit 0, LSB) 42 — AGNDR 21 I B7 BLUE data input (bit 7, MSB) 43 — AVDDR Analog power supply R 22 I B6 BLUE data input (bit 6) 44 O OUTR RED output 2 System clock Analog ground B — Analog ground G — Analog ground R Multimedia ICs BU3618K •Absolute maximum ratings (Ta = 25°C) Symbol Limits Unit Power supply voltage Parameter DVDD – 0.5 ~ + 7.0 V Analog power supply voltage AVDD Input voltage Output voltage Storage temperature Power dissipation DVDD – 0.3 ~ DVDD + 0.3 V VIN – 0.5 ~ DVDD + 0.5 V VOUT – 0.5 ~ DVDD + 0.5 V Tstg – 55 ~ + 125 °C PD 500∗1 mW ∗1 Reduced by 5mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions Parameter Symbol Min. Typ. Max. Unit Digital power supply voltage DVDD 4.5 5.0 5.5 V Analog power supply voltage AVDD 4.5 5.0 5.5 V Transmission clock width TCK 25 — — ns Transmission clock low level width TCKL 10 — — ns Setup time TS 8 — — ns Hold time TH 8 — — ns Input low level voltage VIL 0.0 — 0.8 V Input high level voltage VIH 2.2 — VCC V Operating temperature TOPR – 20 — 75 °C •Electrical characteristics (unless otherwise noted, Ta = 25°C, DV DD Parameter Symbol Min. Typ. Max. = AVDD = 5.0V) Unit Conditions Current consumption ICC — 33 70 mA FCK = 40MHz, PREF = 2.2kΩ RL = 150Ω Differential linearity error ED – 0.5 — 0.5 LSB PREF = 2.2kΩ, RL = 150Ω Integral linearity error EL – 1.0 — 1.0 LSB RGB output full-scale voltage FS 1.24 1.38 1.52 V FSCR 0 0.5 5.0 % TD — 20 — ns TSET — 10 — ns RGB output voltage ratio Output delay time Settling time — CL = 15pF 3 Multimedia ICs BU3618K •Application example RREF RED INPUT 11 GREEN INPUT 10 9 8 7 6 5 4 3 2 1 12 44 13 43 VREF 14 RED OUTPUT 18 19 20 21 40 39 LATCH 17 41 CURRENT CELL CURRENT CELL LATCH 16 LATCH DECODER DECODER DECODER 42 15 CURRENT CELL 24 25 GREEN OUTPUT 37 36 35 34 23 RL 38 22 26 27 28 29 30 31 32 33 0.1µF BLUE INPUT CLK Fig. 1 4 RL RL BLUE OUTPUT 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 TCK TCKL CLK 50% TS TH 50% DATA TSET 90% 50% RGBOUT 50% TD Fig. 2 Input / output interface timing 5 Multimedia ICs BU3618K •External dimensions (Units: mm) 14.0 ± 0.3 10.0 ± 0.2 23 22 44 12 2.15 ± 0.1 0.05 1 0.8 11 0.35 ± 0.1 QFP44 6 1.2 14.0 ± 0.3 10.0 ± 0.2 33 34 0.15 ± 0.1 0.15