A/D, D/C Converters for Image Signal Processing MN65543S Low Power 8-Bit CMOS A/D Converter for Image Processing Overview The MN65543S is an 8-bit CMOS analog-to-digital converter with a maximum conversion rate of 15 MSPS. It uses a half flash structure based on chopper comparators and achieves both high speed and low power consumption with multiplex processing. Features Maximum conversion rate: 15 MSPS (min.) Linearity error: ±0.5 LSB (typ.) Differential linearity error: ±0.3 LSB (typ.) Power supply voltage: 4.40 to 5.25 V Power consumption: 90 mW (typ.) Applications Pin Assignment NOE DVSS (LSB) D0 D1 D2 D3 D4 D5 D6 (MSB) D7 DVDD CLK 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 DVSS VRB VRBS AVSS AVSS VIN AVDD VRT VRTS AVDD AVDD DVDD Digital television receivers Digital video equipment Digital image processing equipment (TOP VIEW) SOP024-P-0375 1 MN65543S A/D, D/C Converters for Image Signal Processing Lower Comparator (4-bit) DVDD AVDD 13 VRTS AVDD 14 15 16 VRT 17 AVDD 18 VIN AVSS AVSS 19 20 21 VRBS VRB 22 23 24 DVSS Block Diagram Lower Comparator (4-bit) Reference Resistor Encoder (4-bit) Encoder (4-bit) Lower Comparator (4-bit) Clock Generator Data Latch 2 12 CLK 11 DVDD D7(MSB) 10 9 D6 8 D5 7 D4 6 D3 5 D2 4 D1 D0(LSB) 3 2 DVSS NOE 1 Encoder (4-bit) A/D, D/C Converters for Image Signal Processing MN65543S Pin Descriptions Pin No. 1 Symbol NOE 2 DVSS 3 D0 Digital output (LSB) 4 D1 Digital output 5 D2 Digital output 6 D3 Digital output 7 D4 Digital output 8 D5 Digital output 9 D6 Digital output 10 D7 11 DVDD Function Description Output enable Ground for digital circuits Digital output (MSB) Power supply for digital circuits 12 CLK Sampling clock 13 DVDD Power supply for digital circuits 14 AVDD Power supply for analog circuits 15 AVDD Power supply for analog circuits 16 VRTS Power supply for reference voltage (TOP) 17 VRT Reference voltage (TOP) 18 AVDD 19 VIN 20 AVSS Ground for analog circuits 21 AVSS Ground for analog circuits 22 VRBS Power supply for reference voltage (BOTTOM) 23 VRB Reference voltage (BOTTOM) 24 DVSS Ground for digital circuits Power supply for analog circuits Analog input Absolute Maximum Ratings Parameter Power supply voltage Ta=25˚C Symbol VDD Rating – 0.3 to +7.0 Unit V Input voltage VI AVSS – 0.3 to AVDD +0.3 V Output voltage VO DVSS – 0.3 to DVDD +0.3 V Operating ambient temperature Topr –20 to +70 ˚C Storage temperature Tstg –55 to +125 ˚C 3 MN65543S A/D, D/C Converters for Image Signal Processing Recommended Operating Conditions Parameter Power supply voltage min 4.50 typ 5.00 max 5.25 Unit V Digital input "H" level VIH 2.4 VDD V voltage "L" level VIL VSS 0.8 V Reference voltage "H" level VRT 3.5 VDD V "L" level VRB VSS 1.5 V "H" level pulse width tWH 30 ns "L" level pulse width tWL 30 ns Clock Analog input voltage VAIN Electrical Characteristics Parameter Power supply current Resolution VSS VDD Symbol IDD Conditions fCLK = 15 MHz min (includes reference power supply) typ max Unit 18 26 mA ±0.5 ±1.3 LSB ±0.4 ±0.8 8 EL fCLK=15MHz Differential linearity error ED VRT=3.5V Maximum conversion rate Fc(max.) 15 Clock frequency V VDD=AVDD=DVDD=5.0V, AVSS=DVSS=0V, Ta=25˚C RES Linearity error 4 VDD=AVDD=DVDD=5.0V, VSS=AVSS=DVSS=0V, Ta=25˚C Symbol VDD VRB=1.5V bit LSB MSPS fCLK 1 15 MHz Analog input dynamic range DR 2 VRT –VRB V Output current "H" level IOH VOH=VDD – 0.8V –2 mA "L" level IOL VOL=0.4V Output delay time td CL=50pF Analog input capacitance CI 2 mA 25 18 40 ns pF A/D, D/C Converters for Image Signal Processing MN65543S Timing Chart The chip samples the analog input at the falling edge of the clock signal and provides the corresponding digital output 2.5 clock cycles later at the rising edge of the clock signal. Clock Analog input Data output N N–3 N+1 N–2 N+2 N+3 N–1 N N+4 N+1 td(25ns) Note: The circles indicate analog signal sampling points. 5 MN65543S A/D, D/C Converters for Image Signal Processing Package Dimensions (Unit:mm) SOP024-P-0375 15.30±0.20 24 13 +0.10 0.15 -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 (0.67) 2.40max. 12 2.00±0.20 1