A/D, D/C Converters for Image Signal Processing MN657021F Low Power 8-Bit, 3-Channel CMOS D/A Converter for Image Processing Features Maximum conversion rate: 27 MSPS (min.) Linearity error: ±0.2 LSB (typ.) Differential linearity error: ±0.2 LSB (typ.) Power supply voltage: 3.15 ±0.3 V Full scale current: 1.75 mA (typ.) Power consumption: 54 mW (typ.) (fCLK=27 MHz) Applications DC4 DC5 DC6 DC7 DC8 DVSS DVDD N.C. AVSS VREFC IREFC COMPC 36 35 34 33 32 31 30 29 28 27 26 25 N.C. DC3 DC2 DC1 UVSEL DVDD DVSS CLK DY8 DY7 DY6 DY5 37 38 39 40 41 42 43 44 45 46 47 48 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 The MN657021F is a high-speed 8-bit, 3-channel CMOS digital-to-analog converter. (Two channels use serial input.) It uses both a matrix cell and weighted current technology to achieve both low power consumption and high speed. It provides independent output amplitude adjustment for the Y (luminance) and C (chroma) synchronization signals. The Y (luminance signal) can be superimposed with an external SYNC signal. Pin Assignment N.C. IOV AVDD IOU AVSS AVDD IOY AVSS VREFY IREFY COMPY VREFY DY4 DY3 DY2 DY1 SYNC DVDD DVSS MSEL N.C. AVDD COMPS IREFS Overview (TOP VIEW) Digital television Digital video equipment TQFP048-P-0707 Digital image processing equipment 1 MN657021F A/D, D/C Converters for Image Signal Processing + CLK 44 (LSB) DC8 37 29 24 9 N.C. COMPY 14 VREFY Latch Current cell Latch Current cell Current cell Decoder Decoder Latch Latch Latch 18 IOY 46 45 40 39 DC2 DC3 38 DC4 36 DC5 35 DC6 34 DC7 Latch (MSB) DC1 Latch (LSB) DY8 Latch 4 3 DY2 2 DY3 DY4 1 DY5 48 DY6 47 DY7 Current Source – Selector Latch (MSB) DY1 + Current Source – SYNC 5 16 15 IREFY COMPS 11 13 V REFS 12 IREFS Block Diagram 21 IOU 33 32 Current cell 28 AVSS 20 AVSS 17 AVSS AVDD 19 AVDD 10 AVDD COMPC 25 26 IREFC VREFC 27 43 DVSS DVSS 31 7 DVSS 42 DVDD 30 DVDD 22 Current Source + – DVDD 2 Latch Selector 8 6 MSEL 41 23 Latch UVSEL Decoder Selector Selector IOV A/D, D/C Converters for Image Signal Processing MN657021F Pin Descriptions Pin No. 1 Symbol DY4 Function Description Y (luminance) digital input 2 DY3 Y (luminance) digital input 3 DY2 Y (luminance) digital input 4 DY1 Y (luminance) digital input (MSB) 5 SYNC SYNC signal judgment signal 6 DVDD Power supply for digital circuits 7 DVSS Ground for digital circuits 8 MSEL Y, C/Y, R-Y, B-Y discrimination signal 9 N.C. 10 AVDD 11 COMPS No connection Power supply for analog circuits Phase compensation 12 IREFS Full scale adjustment resistor 13 VREFS SYNC reference voltage input 14 COMPY 15 IREFY Full scale adjustment resistor 16 VREFY Luminance reference voltage input 17 AVSS Ground for analog circuits Phase compensation 18 IOY 19 AVDD Power supply for analog circuits 20 AVSS Ground for analog circuits 21 IOU 22 AVDD 23 IOV 24 N.C. 25 COMPC Y signal analog current output U signal analog current output Ground for analog circuits V signal analog current output No connection Phase compensation 26 IREFC Full scale adjustment resistor 27 VREFC Chroma reference voltage input 28 AVSS Ground for analog circuits 29 N.C. No connection 30 DVDD Power supply for digital circuits 31 DVSS Ground for digital circuits 32 DC8 C (chroma) digital input (LSB) 33 DC7 C (chroma) digital input 34 DC6 C (chroma) digital input 35 DC5 C (chroma) digital input 36 DC4 C (chroma) digital input 37 N.C. No connection 38 DC3 C (chroma) digital input 39 DC2 C (chroma) digital input 40 DC1 41 UVSEL 42 DVDD C (chroma) digital input (MSB) U/V signal discrimination for C (chroma) signal Power supply for digital circuits 3 MN657021F A/D, D/C Converters for Image Signal Processing Pin Descriptions (continued) Pin No. 43 Symbol DVSS Function Description Ground for digital circuits 44 CLK Sampling clock 45 DY8 Y (luminance) digital input (LSB) 46 DY7 Y (luminance) digital input 47 DY6 Y (luminance) digital input 48 DY5 Y (luminance) digital input Absolute Maximum Ratings Ta=25˚C Parameter Power supply voltage for digital circuits Symbol DVDD Rating – 0.3 to +7.0 Unit V Power supply voltage for analog circuits AVDD – 0.3 to +7.0 V Input voltage VI – 0.3 to DVDD +0.3 V Output voltage VO – 0.3 to AVDD +0.3 V Operating ambient temperature Topr –20 to +70 ˚C Storage temperature Tstg –55 to +125 ˚C Recommended Operating Conditions VDD=AVDD=DVDD=3.0V, VSS=AVSS=DVSS=0V, Ta=25˚C Parameter Power supply voltage Symbol VDD min 2.85 typ 3.0 max 3.45 Unit V Reference voltage VREFS/Y, C 1.0 1.85/1.63 2.3 V RREFS/Y, C 2.0/0.58 5.0/2.5 8.0/5.0 kΩ CCOMPS, Y, C 0.33 1.0 3.3 µF ROUT 75 400 500 Ω VIH VDD × 0.75 VDD V VDD × 0.25 Reference resistance External compensation capacitor Output load resistance Digital input "H" level voltage "L" level VIL VSS Clock "H" level pulse width tWH 16 ns "L" level pulse width tWL 16 ns Electrical Characteristics Parameter Power supply current V DVDD=AVDD=3.0V, DVSS=AVSS=0V, Ta=25˚C Symbol Conditions IDD FCLK=30MHz, MSEL="H", min Output amplitude=0.7 V, typ max Unit 18 28 mA ROUT=400Ω Resolution RES 8 VDD=3.0V, Y output amplitude=0.7V ±0.2 ±0.5 LSB Differential linearity error ED UV output amplitude=0.7V ±0.2 ±0.5 LSB Full scale current IFS ROUT=400Ω 1.75 RREFY=2.5kΩ, RREFC=2.5kΩ Setup time tS Hold time tH Settling time tST Maximum conversion speed FC(max.) Analog output delay time td mA 12 ns 10 UV output amplitude=0.7V VDD=3.0V, Y output amplitude=0.7V, UV output amplitude=0.7V ns 25 VDD=3.0V, Y output amplitude=0.7V, ROUT=400Ω, RREF=2.5kΩ 4 bit EL Linearity error 27 37 ns MSPS 10 ns A/D, D/C Converters for Image Signal Processing MN657021F Timing Chart M SELECT = "L," Y and U(C), 2-channel output SYNC CLK DY1 to DY8 Y-1 Y0 Y1 Y2 Y3 Y4 Y5 DC1 to DC8 C-1 C0 C1 C2 C3 C4 C5 IOY Y-3 Y-2 Y-1 Y-0 Y3 Y1 tds IOU C-3 C-2 C-1 Two clock cycles C-0 C1 tds C2 C3 td tst tds: SYNC delay time td: Analog output delay time tst: Settling time 5 MN657021F A/D, D/C Converters for Image Signal Processing M SELECT = "H," Y and U(C), 3-channel output SYNC CLK DY1 to DY8 Y-1 Y0 Y1 Y2 Y3 Y4 Y5 DC1 to DC8 Y-2 U0 V0 U2 V2 U4 V4 UVSEL Two clock cycles Y-2 IOY Y-1 Y0 Y1 Y3 tds tds IOU U-4 U-2 U0 U2 IOV V-4 V-2 V0 V2 Two clock cycles td tst 6 tds: SYNC delay time td: Analog output delay time tst: Settling time A/D, D/C Converters for Image Signal Processing MN657021F Package Dimensions (Unit:mm) TQFP048-P-0707 9.0±0.2 7.0±0.2 36 25 24 9.0±0.2 7.0±0.2 (0.75) 37 13 48 1 0.5 (0.75) 12 0.2±0.1 0.1 SEATING PLANE 0.1±0.1 0.15 +0.10 -0.05 2.9 max. 2.5±0.2 (1.0) 0.5±0.2 0 to 10° 7