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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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AD8320-EB Fiches technique(PDF) 1 Page - Analog Devices |
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AD8320-EB Fiches technique(HTML) 1 Page - Analog Devices |
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1 / 20 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 AD8320 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 Serial Digital Controlled Variable Gain Line Driver FEATURES 8-Bit Serial Gain Control V/V/LSB Linear Gain Response 36 dB Gain Range 0.20 dB Gain Accuracy Upper Bandwidth: 150 MHz 22 dBm 1 dB Compression Point (75 ) Drives Low Distortion Signals into 75 Load: –57 dBc SFDR at 42 MHz and 12 dBm Out –46 dBc SFDR at 42 MHz and 18 dBm Out Single Supply Operation from 5 V to 12 V Maintains 75 Output Impedance Power-Up and Power-Down Condition Supports SPI Input Control Standard APPLICATIONS Coaxial Cable Driver HFC Cable Telephony Systems HFC High Speed Data Modems Interactive Set-Top Boxes PC Plug-In Modems Interfaces with AD9853 I2C Controlled Digital Modulator High Performance Digitally Controlled Variable Gain Block DESCRIPTION The AD8320 is a digitally controlled variable gain amplifier optimized for coaxial line driving applications. An 8-bit serial word determines the desired output gain over a 36 dB range (256 gain levels). The AD8320 provides linear gain response. The AD8320 is made up of a digitally controlled variable at- tenuator of 0 dB to –36 dB, which is preceded by a low noise, fixed gain buffer and followed by a low distortion high power amplifier. The AD8320 has a 220 Ω input impedance and ac- cepts a single-ended input signal with a specified analog input level of up to 0.310 V p-p. The output is specified for driving a 75 Ω load, such as coaxial cable, although the AD8320 is ca- pable of driving other loads. Distortion performance of –57 dBc is achieved with an output level up to 12 dBm (3.1 V p-p) at 42 MHz, while –46 dBc distortion is achieved with an output level up to 18 dBm (6.2 V p-p). A key performance and cost advantage of the AD8320 results from the ability to maintain a constant 75 Ω output impedance during power-up and power-down conditions. This eliminates the need for external 75 Ω back-termination, resulting in twice the effective output voltage when compared to a standard opera- tional amplifier. Additionally, the on-chip 75 Ω termination results in low glitch output during power-down and power-up transitions, eliminating the need for an external switch. The AD8320 is packaged in a 20-lead SOIC and operates from a single +5 V through +12 V supply and has an operational temperature range of –40 °C to +85°C. FREQUENCY – MHz 1 10 100 20 30 40 50 60 70 80 PO = 4dBm PO = 12dBm PO = 8dBm PO = 18dBm Figure 1. Worst Harmonic Distortion vs. Frequency for Various Output Levels at VCC = 12 V FUNCTIONAL BLOCK DIAGRAM POWER- DOWN/ SWITCH INTER. PWR AMP DATA SHIFT REGISTER DATA LATCH REVERSE AMP ATTENUATOR CORE GND VCC VREF VIN REFERENCE INV. BUF. DATEN CLK SDATA PD VOUT AD8320 |
Numéro de pièce similaire - AD8320-EB |
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Description similaire - AD8320-EB |
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