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AD7485BST Datasheet(PDF) 1 Page - AMIC Technology |
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AD7485BST Datasheet(HTML) 1 Page - AMIC Technology |
1 / 16 page REV. 0 a 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 AD7485 1 MSPS, Serial 14-Bit SAR ADC FEATURES Fast Throughput Rate: 1 MSPS Wide Input Bandwidth: 40 MHz Excellent DC Accuracy Performance Flexible Serial Interface Low Power: 80 mW (Full Power) and 3 mW (NAP Mode) STANDBY Mode: 2 A Max Single 5 V Supply Operation Internal 2.5 V Reference Full-Scale Overrange Indication FUNCTIONAL BLOCK DIAGRAM 2.5 V REFERENCE BUF T/H AVDD AGND CBIAS DVDD DGND REFSEL REFOUT REFIN VIN 14-BIT ALGORITHMIC SAR NAP STBY RESET CONVST MCLK TFS SCO CONTROL LOGIC AND I/O REGISTERS SMODE AD7485 VDRIVE SDO GENERAL DESCRIPTION The AD7485 is a 14-bit, high speed, low power, successive- approximation ADC. The part features a serial interface with throughput rates up to 1 MSPS. The part contains a low noise, wide bandwidth track-and-hold that can handle input frequencies in excess of 40 MHz. The conversion process is a proprietary algorithmic successive- approximation technique. The input signal is sampled and a conversion is initiated on the falling edge of the CONVST signal. The conversion process is controlled by an external master clock. Interfacing is via standard serial signal lines, making the part directly compatible with microcontrollers and DSPs. The AD7485 provides excellent ac and dc performance specifi- cations. Factory trimming ensures high dc accuracy resulting in very low INL, DNL, offset, and gain errors. The part uses advanced design techniques to achieve very low power dissipation at high throughput rates. Power consumption in the normal mode of operation is 80 mW. There are two power- saving modes: a NAP mode keeps reference circuitry alive for quick power-up and consumes 3 mW, while a STANDBY mode reduces power consumption to a mere 10 µW. The AD7485 features an on-board 2.5 V reference, but the part can also accommodate an externally provided 2.5 V reference source. The nominal analog input range is 0 V to 2.5 V. The AD7485 also provides the user with overrange indication via a fifteenth bit. If the analog input range strays outside the 0 V to 2.5 V input range, the fifteenth data bit is set to a logic high. The AD7485 is powered from a 4.75 V to 5.25 V supply. The part also provides a VDRIVE pin that allows the user to set the voltage levels for the digital interface lines. The range for this VDRIVE pin is from 2.7 V to 5.25 V. The part is housed in a 48-lead LQFP package and is specified over a –40 °C to +85°C temperature range. |
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