XRD8785 CMOS 8-Bit High Speed Analog-to-Digital Converter April 2002 FEATURES 20-Pin Package Available: XRD8775 8-Bit Resolution 3V Version: XRD87L85 Up to 20 MHz Sampling Rate APPLICATIONS Internal S/H Function Digital Color Copiers Single Supply: 5V Cellular Telephones VIN DC Range: 0V to V DD CCDs and Scanners VREF DC Range: 1V to V DD Video Capture Boards Low Power: 75mW typ. (excluding reference) Latch-Up Free ESD Protection: 2000V Minimum GENERAL DESCRIPTION V and V to V , or provide external reference RBS RT RTS The XRD8785 is an 8-bit Analog-to-Digital Converter. voltages to the V and V pins. The internal reference RB RT Designed using an advanced 5V CMOS process, this generates 0.6V at V and 2.6 V at V . Providing RB RT part offers excellent performance, low power con- external reference voltages allows easy interface to sumption, and latch-up free operation. any input signal range between AGND and AV . This DD This device uses a two-step flash architecture to also allows the system to adjust these voltages to maintain low power consumption at high conversion cancel zero scale and full scale errors, or to change the rates. The input circuitry of the XRD8785 includes an input range as needed. on-chip S/H function which allows the user to digitize The device operates from a single +5V supply. Power analog input signals between AGND and AV . Careful DD consumption is 75mW at FS = 15MHz. Specified for design and chip layout have achieved a low analog operation over the commercial/industrial (40 to input capacitance. This reduces kickback and eases +85C) temperature range, the XRD8785 is available in the requirements of the buffer/amplifier used to drive Plastic Dual-in-line (PDIP), Surface Mount (SOIC) and the XRD8785. The designer can choose the internally Small Outline (SOP) packages in EIAJ and JEDEC. generated reference voltages by connecting V to RB SIMPLIFIED BLOCK AND TIMING DIAGRAM Rev. 3.00 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017XRD8785 ORDERING INFORMATION Package Temperature Part No. DNL INL Type Range (LSB) (LSB) SOIC (Jedec) 40 to +85C XRD8785AID +/- 0.75 +/-1.5 SOP (EIAJ) 40 to +85C XRD8785AIK +/- 0.75 +/-1.5 Plastic Dip (300MIL) 40 to +85C XRD8785AIP +/- 0.75 +/-1.5 PIN CONFIGURATIONS See Packaging Section for Package Dimensions 24-Pin SOP (EIAJ, 5.4mm) K24 24-Pin PDIP (300 MIL) - P24 24-Pin SOIC (Jedec, 300 MIL) D24 PIN OUT DEFINITIONS PIN NO. NAME DESCRIPTION PIN NO. NAME DESCRIPTION 13 DV Digital Power Supply 1 OE Output Enable DD 2 DGND Digital Ground 14 AV Analog Power Supply DD 15 AV Analog Power Supply 3 DB0 Data Output Bit 0 (LSB) DD 4 DB1 Data Output Bit 1 16 V Generates 2.6 V if tied to V RTS RT 17 V Top Reference 5 DB2 Data Output Bit 2 RT 6 DB3 Data Output Bit 3 18 AV Analog Power Supply DD 19 VIN Analog Input 7 DB4 Data Output Bit 4 8 DB5 Data Output Bit 5 20 AGND Analog Ground 21 AGND Analog Ground 9 DB6 Data Output Bit 6 22 V Generates 0.6 V if tied to V 10 DB7 Data Output Bit 7 (MSB) RBS RB 23 V Bottom Reference 11 DV Digital Power Supply DD RB 24 DGND Digital Ground 12 CLK Sampling Clock Input Rev. 3.00 2