A/D and D/A Converters AN8140K High-speed Low Power Consumption 10-bit D/A Converter ■ Overview • 10-bit resolution • High speed : maximum conversion rate of 50MSPS • Low power comsumption : 150mW • TTL compatible input level • Single 5V power supply • Built-in reference power supply 24 23 22 21 20 19 18 17 16 15 14 13 1.778 21.7±0.3 ■ Features 1 2 3 4 5 6 7 8 9 10 11 12 0.5±0.1 0.9±0.25 Unit : mm The AN8140K is a 10-bit D/A converter for image processing which has realized low power comsumption by using the Bi-CMOS process. 1.1±0.25 6.2±0.3 3.05±0.25 4.7±0.25 ■ Application Field 0.3± • Image equipment such as hi-vision device • OA equipment such as image scanner • Measuring equipment such as digital oscilloscope 3 ∼15˚ + 0.2 – 0.05 7.62±0.25 24-pin Shrunk DIL Plastic Package (SDIP024-P-0300) ■ Block Diagram COMP CLK D5 D4 D3 D2 D1 (LSB) D0 9 14 19 20 21 22 23 24 REFI 7 + IREF 10 – X – Decoder Current Source Latch D6 18 D7 17 D8 16 D9 (MSB) 15 Latch 1/4 1/8 Latch X– Decoder 1/2 Reference Voltage Regulator 3 13 2 11 12 4 AGND DVCC DGND AVCC AVCC AGND 8 1 VIB NC 5 OUT 6 REFO 1 A/D and D/A Converters AN8140K ■ Main Characteristics (VCC=5.0V, Ta=25˚C) Parameter Condition Rating Resolution Unit 10 bit Linearity error RREF = 470Ω ±1.0 LSB Differential linearity error RO = 75Ω ±1.0 LSB Maximum conversion rate VREFO –VREFI = 1.4V 50 MSPS ■ Absolute Maximum Rating (Ta=25˚C) Symbol Rating Supply voltage Paremeter VCC – 0.3 to +7.0 Unit Digital input voltage VIN – 0.3 to DVCC Analogue output current IO 30 Reference input voltage V V mA VREFI – 0.3 to AVCC Power dissipation PD 700 Operating ambient temperature Topr –20 to + 70 ˚C Storage temperature Tstg –55 to +150 ˚C V mW ■ Electrical Characteristics (VCC=5.0V, Ta=25˚C) Parameter Symbol Supply current ICC Digital input leak current ILK1 REFI input leak current Reference output voltage Rating min typ 30 max Unit 50 mA VIN= 0V, 5V ±30 µA ILK2 VIN= 0V, 5V ±30 µA VREFO IREFO= 3.0mA Linearty error EL Differential linearty error ED Maximum conversion rate FC Full-scale output voltage VFS Zero-scale output voltage VZS Settling time tST 2.16 RREF= 470Ω 2.7 3.24 V ±0.5 ±1 LSB ±0.5 ±1 50 RO= 75Ω VREF0 –VREFI= 1.4V LSB MSPS 4.9 5.0 5.1 3.8 4.0 4.2 V V 20 ns ■ Recommended Operating Conditions (Ta=25˚C) Parameter Symbol Supply voltage VCC Regerence voltage vREFO = 2.7V VREFI Output load resistance RO Digital input voltage Conditions min typ max Unit 4.75 5.0 5.25 V RO = 75Ω, RREF = 470Ω VIH V 75 Ω 2.4 VIL V 0.8 V tWH *1 8 *2 ns tWL *1 8 *2 ns Setting-up time tS *1 5 ns Holding time tH *1 1 ns Clock input pulse width *1 : Refer to the timing chart. *2 : tWH+tWL≥20ns 2 1.3 A/D and D/A Converters AN8140K ■ Pin Descriptions Pin No. Symbol Pin name Pin No. Symbol Pin name 1 NC No connection pin 13 DVCC Digital power supply 2 DGND Digital GND 14 CLK Clock input 3 AGND Analogue GND 15 D9 Digital input 1-bit (MSB) 4 AGND Analogue GND 16 D8 Digital input 2-bit 5 OUT Analogue output 17 D7 Digital input 3-bit 6 REFO Reference voltage output 18 D6 Digital input 4-bit 7 REFI Reference voltage input 19 D5 Digital input 5-bit 8 VIB Stabilized capacitive pin 20 D4 Digital input 6-bit 9 COMP Compensation capacitive pin 21 D3 Digital input 7-bit 10 IREF Reference current pin 22 D2 Digital input 8-bit 11 AVCC Analogue power supply 23 D1 Digital input 9-bit 12 AVCC Analogue power supply 24 D0 Digital input 10-bit (LSB) ■ Timing Chart tWL tWH CLK tS DATA tH Dn Dn – 1 Dn+1 tST OUT An – 2 An – 1 An 3 A/D and D/A Converters AN8140K ■ Output Code Digital input Output voltage Step 0123456789 VOUT 000 0000000000 4.0000 001 0000000001 4.0010 · · · · · · · · · 511 0111111111 4.4995 512 1000000000 4.5005 513 1000000001 4.5015 · · · · · · · · · 1022 1111111110 4.9990 1023 1111111111 5.0000 ■ Application Circuit DIGITAL IN (LSB) Ro Video Signal OUT 75Ω LOW PASS FILTER NC D0 DGND D1 AGND D2 AGND D3 OUT D4 REFO D5 REFI D6 VIB D7 COMP D8 IREF D9 10kΩ + 5kΩ + 1µF RREF (MSB) 470Ω AVCC CLK AVCC DVCC CLK + AVCC 4 DVCC AGND DGND +