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AD7740KRMZ 데이터시트(PDF) 1 Page - Analog Devices |
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1 / 11 page FUNCTIONAL BLOCK DIAGRAM BUF VDD CLKIN AD7740 VIN FOUT 2.5V REFERENCE VOLTAGE-TO- FREQUENCY MODULATOR CLKOUT GND CLOCK GENERATION REFIN/OUT X1 REV. 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7740* FEATURES Synchronous Operation Full-Scale Frequency Set by External System Clock 8-Lead SOT-23 and 8-Lead microSOIC Packages 3 V or 5 V Operation Low Power: 3 mW (Typ) Nominal Input Range: 0 to VREF True –150 mV Capability Without Charge Pump VREF Range: 2.5 V to VDD Internal 2.5 V Reference 1 MHz Max Input Frequency Selectable High Impedance Buffered Input Minimal External Components Required APPLICATIONS Isolation of High Common-Mode Voltages Low-Cost Analog-to-Digital Conversion Battery Monitoring Automotive Sensing GENERAL DESCRIPTION The AD7740 is a low-cost, ultrasmall synchronous Voltage-to- Frequency Converter (VFC). It works from a single 3.0 V to 3.6 V or 4.75 V to 5.25 V supply consuming 0.9 mA. The AD7740 is available in an 8-lead SOT-23 and also in an 8-lead microSOIC package. Small package, low cost and ease of use were major design goals for this product. The part contains an on-chip 2.5 V bandgap reference but the user may overdrive this using an external reference. This external reference range includes VDD. The full-scale output frequency is synchronous with the clock signal on the CLKIN pin. This clock can be generated with the addition of an external crystal (or resonator) or supplied from a CMOS-compatible clock source. The part has a maximum input frequency of 1 MHz. For an analog input signal that goes from 0 V to VREF, the out- put frequency goes from 10% to 90% of fCLKIN. In buffered mode, the part provides a very high input impedance and accepts a range of 0.1 V to VDD – 0.2 V on the VIN pin. There is also an unbuffered mode of operation that allows VIN to go from –0.15 V to VDD + 0.15 V. The modes are interchangeable using the BUF pin. The AD7740 (Y Grade) is guaranteed over the automotive temperature range of –40 °C to +105°C. The AD7740 (K Grade) is guaranteed from 0 °C to 85°C. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 PRODUCT HIGHLIGHTS 1. The AD7740 is a single channel, single-ended VFC. It is available in 8-lead SOT-23 and 8-lead microSOIC packages, and is intended for low-cost applications. The AD7740 offers considerable space saving over alternative solutions. 2. The AD7740 operates from a single 3.0 V to 3.6 V or 4.75 V to 5.25 V supply and consumes typically 0.9 mA when the input is unbuffered. It also contains an automatic power-down function. 3. The AD7740 does not require external resistors and capaci- tors to set the output frequency. The maximum output frequency is set by a crystal or a clock. No trimming or cali- bration is required. 4. The analog input can be taken to 150 mV below GND for true bipolar operation. 5. The specified voltage reference range on REFIN is from 2.5 V to the supply voltage, VDD. 3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter *Protected under U.S. Patent # 6,147,528. |
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