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AD7804BR датащи(PDF) 1 Page - Analog Devices |
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AD7804BR датащи(HTML) 1 Page - Analog Devices |
1 / 28 page GENERAL DESCRIPTION The AD7804/AD7808 are quad/octal 10-bit digital-to-analog converters, with serial load capabilities, while the AD7805/AD7809 are quad/octal 10-bit digital-to-analog converters with parallel load capabilities. These parts operate from a +3.3 V to +5 V ( ±10%) power supply and incorporates an on-chip reference. These DACs provide output signals in the form of VBIAS ± V SWING. VSWING is derived internally from VBIAS. On-chip control registers include a system control register and channel control registers. The system control register has control over all DACs in the package. The channel control registers allow individual control of DACs. The complete transfer function of each individual DAC can be shifted around the VBIAS point using an on-chip Sub DAC. All DACs contain double buffered data inputs, which allow all analog outputs to be simultaneously updated using the asynchronous LDAC input. Control Features Channels Controlled Main DAC Sub DAC Hardware Clear All System Control Power Down1 All System Standby2 All System Clear All Input Coding All Channel Control Channel Standby2 Selective Channel Clear Selective VBIAS Selective NOTES 1Power-down function powers down all internal circuitry including the reference. 2Standby functions power down all circuitry except for the reference. FUNCTIONAL BLOCK DIAGRAMS VOUTD VOUTC VOUTB VOUTA CHANNEL C CONTROL REG CHANNEL B CONTROL REG CHANNEL A CONTROL REG DAC REGISTER DAC D VBIAS DATA REGISTER AVDD DIVIDER CHANNEL D CONTROL REG REFIN REFOUT LDAC CLR AVDD DVDD AGND DGND CLKIN FSIN AD7804/ AD7808 COMP SDIN POWER ON RESET DAC REGISTER DAC C VBIAS DATA REGISTER DAC REGISTER DAC B VBIAS DATA REGISTER MUX DAC REGISTER DAC A VBIAS DATA REGISTER SYSTEM CONTROL REG INPUT SHIFT REGISTER & CONTROL LOGIC MUX MUX 1.23V REF MUX VOUTG* VOUTE* VOUTH* VOUTF* PD** **ONLY AD7804 SHOWN FOR CLARITY **SHOWS ADDITIONAL CHANNELS ON THE AD7808 **PIN ON THE AD7808 ONLY VOUTD VOUTC VOUTB VOUTA CHANNEL C CONTROL REG CHANNEL B CONTROL REG CHANNEL A CONTROL REG DAC REGISTER DAC D VBIAS DATA REGISTER AVDD DIVIDER CHANNEL D CONTROL REG REFIN REFOUT LDAC CLR AVDD DVDD AGND DGND WR CS AD7805/ AD7809 COMP POWER ON RESET MUX DAC REGISTER DAC C VBIAS DATA REGISTER DAC REGISTER DAC B VBIAS DATA REGISTER MUX DAC REGISTER DAC A VBIAS DATA REGISTER SYSTEM CONTROL REG INPUT REGISTER MUX MUX 1.23V REF CONTROL LOGIC MODE A0 A1 DB9 DB2 DB1 DB0 VOUTG* VOUTH* PD** **ONLY AD7805 SHOWN FOR CLARITY **SHOWS ADDITIONAL CHANNELS ON THE AD7809 **PIN ON THE AD7809 ONLY A2** VOUTE* VOUTF* Index on Page 26. 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 +3.3 V to +5 V Quad/Octal 10-Bit DACs FEATURES Four 10-Bit DACs in One Package Serial and Parallel Loading Facilities Available AD7804 Quad 10-Bit Serial Loading AD7805 Quad 10-Bit Parallel Loading AD7808 Octal 10-Bit Serial Loading AD7809 Octal 10-Bit Parallel Loading +3.3 V to +5 V Operation Power-Down Mode Power-On Reset Standby Mode (All DACs/Individual DACs) Low Power All CMOS Construction 10-Bit Resolution Double Buffered DAC Registers Dual External Reference Capability APPLICATIONS Optical Disk Drives Instrumentation and Communication Systems Process Control and Voltage Setpoint Control Trim Potentiometer Replacement Automatic Calibration AD7804/AD7805/AD7808/AD7809 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., 1998 |
Аналогичный номер детали - AD7804BR |
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Аналогичное описание - AD7804BR |
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