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AD7742 Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD7742 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 12 page 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 AD7741/AD7742 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., 1999 Single and Multichannel, Synchronous Voltage-to-Frequency Converters FUNCTIONAL BLOCK DIAGRAMS X1 VOLTAGE-TO- FREQUENCY MODULATOR CLOCK GENERATION CLKIN CLKOUT GND VIN POWER-DOWN LOGIC PD REFIN/OUT VDD fOUT AD7741 +2.5V REFERENCE X1/X2 INPUT MUX VOLTAGE-TO- FREQUENCY MODULATOR REFIN +2.5V REFERENCE REFOUT CLOCK GENERATION CLKIN CLKOUT GND GAIN VIN1 A1 A0 VIN2 VIN3 VIN4 POWER-DOWN LOGIC PD UNI/ BIP VDD fOUT AD7742 FEATURES AD7741: One Single-Ended Input Channel AD7742: Two Differential or Three Pseudo-Differential Input Channels Integral Nonlinearity of 0.012% at fOUT(Max) = 2.75 MHz (AD7742) and at fOUT(Max) = 1.35 MHz (AD7741) Single +5 V Supply Operation Buffered Inputs Programmable Gain Analog Front-End On-Chip +2.5 V Reference Internal/External Reference Option Power Down to 35 A Max Minimal External Components Required 8-Lead and 16-Lead DIP and SOIC Packages APPLICATIONS Low Cost Analog-to-Digital Conversion Signal Isolation GENERAL DESCRIPTION The AD7741/AD7742 are a new generation of synchronous voltage-to-frequency converters (VFCs). The AD7741 is a single-channel version in an 8-lead package (SOIC/DIP) and the AD7742 is a multichannel version in a 16-lead package (SOIC/ DIP). No user trimming is required to achieve the specified performance. The AD7741 has a single buffered input whereas the AD7742 has four buffered inputs that may be configured as two fully- differential inputs or three pseudo-differential inputs. Both parts include an on-chip +2.5 V bandgap reference that provides the user with the option of using this internal reference or an exter- nal reference. The AD7741 has a single-ended voltage input range from 0 V to REFIN. The AD7742 has a differential voltage input range from –VREF to +VREF. Both parts operate from a single +5 V supply consuming typically 6 mA, and also contain a power- down feature that reduces the current consumption to less than 35 µA. |
Codice articolo simile - AD7742 |
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Descrizione simile - AD7742 |
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