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AD775JR Fiches technique(PDF) 1 Page - Analog Devices |
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AD775JR Fiches technique(HTML) 1 Page - Analog Devices |
1 / 12 page FUNCTIONAL BLOCK DIAGRAM REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a 8-Bit 20 MSPS, 60 mW Sampling A/D Converter AD775 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FEATURES CMOS 8-Bit 20 MSPS Sampling A/D Converter Low Power Dissipation: 60 mW +5 V Single Supply Operation Differential Nonlinearity: 0.3 LSB Differential Gain: 1% Differential Phase: 0.5 Degrees Three-State Outputs On-Chip Reference Bias Resistors Adjustable Reference Input Video Industry Standard Pinout Small Packages: 24-Pin 300 Mil SOIC Surface Mount 24-Pin 400 Mil Plastic DIP PRODUCT DESCRIPTION The AD775 is a CMOS, low power, 8-bit, 20 MSPS sampling analog-to-digital converter (ADC). The AD775 features a built- in sampling function and on-chip reference bias resistors to pro- vide a complete 8-bit ADC solution. The AD775 utilizes a pipelined/ping pong two-step flash architecture to provide high sampling rates (up to 35 MHz) while maintaining very low power consumption (60 mW). Its combination of excellent DNL, fast sampling rate, low dif- ferential gain and phase errors, extremely low power dissipation, and single +5 V supply operation make it ideally suited for a variety of video and image acquisition applications, including portable equipment. The AD775’s reference ladder may be con- nected in a variety of configurations to accommodate different input ranges. The low input capacitance (11 pF typical) provides an easy-to-drive input load compared to conventional flash converters. The AD775 is offered in both 300 mil SOIC and 400 mil DIP plastic packages, and is designed to operate over an extended commercial temperature range (–20 °C to +75°C). PRODUCT HIGHLIGHTS Low Power: The AD775 has a typical supply current of 12 mA, for a power consumption of 60 mW. Reference ladder current is also low: 6.6 mA typical, minimizing the reference power consumption. Complete Solution: The AD775’s switched capacitor design features an inherent sample/hold function: no external SHA is required. On-chip reference bias resistors are included to allow a supply-based reference to be generated without any external resistors. Excellent Differential Nonlinearity: The AD775 features a typical DNL of 0.3 LSBs, with a maximum limit of 0.5 LSBs. No missing codes is guaranteed. Single +5 V Supply Operation: The AD775 is designed to oper- ate on a single +5 V supply, and the reference ladder may be configured to accommodate analog inputs inclusive of ground. Low Input Capacitance: The 11 pF input capacitance of the AD775 can significantly decrease the cost and complexity of input driving circuitry, compared with conventional 8-bit flash ADCs. 1 2 7 8 3 4 5 6 9 10 15 16 14 13 12 11 19 20 17 18 21 24 23 22 CLOCK LOGIC FINE COMPARATORS BANK B FINE COMPARATORS BANK A COARSE COMPARATORS AVDD AVSS D7 (MSB) D0 (LSB) 15 VRTS VRT VRB VRBS OE AVSS CLK DVSS AVDD VIN DVDD AD775 4 8 5 255 |
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