A/D, D/C Converters for Image Signal Processing MN6556A, MN6556AS Low Power 8-Bit CMOS D/A Converters for Image Processing Overview The MN6556A and MN6556AS are 8-bit CMOS digital-to-analog converters with a maximum conversion rate of 20 MSPS. They use both a matrix cell and weighted current technology to achieve a low power consumption of only 50 mW. Output has an amplitude of one volt above the ground level. Features Maximum conversion rate: 20 MSPS (min.) Linearity error: ±0.3 LSB (typ.) Differential linearity error: ±0.3 LSB (typ.) Power supply voltage: 5.0±0.5 V Power consumption: 50 mW (typ.) Full scale current: 5 mA (typ.) Applications Pin Assignment MN6556A : DIP022-P-0400 MN6556AS : SOP022-P-0375 AVDD 1 22 DVSS AVDD 2 21 DB8 IO 3 20 DB7 VC 4 19 DB6 VIB 5 18 DB5 COMP 6 17 DB4 VREF 7 16 DB3 IREF 8 15 DB2 AVSS 9 14 DB1 N.C. 10 13 CLK N.C. 11 12 DVDD Digital television Digital video equipment (TOP VIEW) Digital image processing equipment Measuring instrument 1 MN6556A, MN6556AS A/D, D/C Converters for Image Signal Processing Block Diagram + VREF 7 IREF 8 Latch 1/2 1/4 Latch Y-Decoder 15 3 IO ROUT VC 4 5 VIB 9 AVSS 2 AVDD 1 AVDD 22 DVSS DVDD N.C. Matrix Current Cell + N.C. 12 14 10 DB1 (MSB) Latch 16 11 DB2 DB8 (LSB) X-Decoder Current Source RREF DB3 21 DB7 20 DB6 19 DB5 18 17 13 DB4 CLK 6 COMP – – 2 A/D, D/C Converters for Image Signal Processing MN6556A, MN6556AS Pin Descriptions Pin No. 1 Symbol AVDD Function Description Power supply for analog circuits 2 AVDD Power supply for analog circuits 3 IO Analog current output 4 VC Capacitor connection 5 VIB Capacitor connection 6 COMP Phase compensation 7 VREF Reference voltage input pin 8 IREF Reference resistor 9 AVSS Ground for analog circuits 10 N.C. No connection 11 N.C. No connection 12 DVDD Ground for digital circuits 13 CLK Sampling clock 14 DB1 Digital input (MSB) 15 DB2 Digital input 16 DB3 Digital input 17 DB4 Digital input 18 DB5 Digital input 19 DB6 Digital input 20 DB7 Digital input 21 DB8 Digital input (LSB) 22 DVSS Power supply for digital circuits Absolute Maximum Ratings Parameter Ta=25˚C 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 DVSS – 0.3 to DVDD +0.3 V Output voltage VO AVSS – 0.3 to AVDD +0.3 V Operating ambient temperature Topr –20 to +70 ˚C Storage temperature Tstg –55 to +125 ˚C 3 MN6556A, MN6556AS A/D, D/C Converters for Image Signal Processing Recommended Operating Conditions Parameter Power supply voltage Reference voltage VREF Reference resistance RREF min 4.5 typ 5.0 max 5.5 Unit V 1.8 V 1.5 kΩ External compensation capacitor CCOMP 1 µF Output load resistance ROUT 200 Ω Digital input "H" level VIH 2.4 VDD V voltage "L" level VIL VSS 0.8 V Clock "H" level pulse width tWH 20 ns "L" level pulse width tWL 20 ns Electrical Characteristics Parameter Power supply voltage Resolution DVDD=AVDD=5.0V, DVSS=AVSS=0V, Ta=25˚C Symbol IDD Conditions min RES typ 10 max 20 8 Unit mA bit Linearity error EL RREF=1.5kΩ, ROUT=200Ω ±0.3 ±0.5 LSB Differential linearity error ED VREF=1.8V ±0.3 ±0.5 LSB Full scale current IFS RREF=1.5kΩ, VREF=1.8V 5.0 5.5 mA Setup time tS Hold time tH Settling time tST Maximum conversion speed 4 VDD=AVDD=DVDD=5.0V, VSS=AVSS=DVSS=0V, Ta=25˚C Symbol VDD FC(max.) 4.5 15 ns 15 RREF=1.5kΩ, ROUT=200Ω VREF=1.8V ns 50 20 ns MSPS A/D, D/C Converters for Image Signal Processing MN6556A, MN6556AS Timing Chart tWH tWL 2.4V CLK 0.8V tS Data Dn-1 tH Dn Dn+1 ±1/2LSB Analog Output (Settling waveform) An td tST ±1/2LSB td tST 5 MN6556A, MN6556AS A/D, D/C Converters for Image Signal Processing Package Dimensions (Unit:mm) MN6556A DIP022-P-0400 27.7±0.4 12 1 11 2.54 3.3±0.3 0.7min. 5.3max. 3.65±0.20 8.6±0.2 22 0.5±0.1 0 to 15° SEATING PLANE 1.2±0.1 MN6556AS 10.16±0.20 SOP022-P-0375 15.30±0.20 12 22 0.15 +0.10 -0.05 9.40±0.30 7.20±0.20 1.10±0.20 0 to 10° 0.30min. 1.27 0.40±0.10 SEATING PLANE 6 0.10±0.10 (1.29) 2.40max. 11 2.00±0.20 1 +0.20 .05 0.25 -0