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AD8260ACPZ-R7 Fiches technique(PDF) 1 Page - Analog Devices |
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AD8260ACPZ-R7 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 32 page High Current Driver Amplifier and Digital VGA/Preamplifier with 3 dB Steps AD8260 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved. FEATURES High current driver Differential input—direct drive from DAC Preset gain: 1.5× −3 dB bandwidth: 195 MHz Large output drive: >±300 mA VGA/preamplifier Low noise Voltage noise: 2.4 nV/√Hz Current noise: 5 pA/√Hz −3 dB bandwidth: 230 MHz Gain range: 30 dB in 3 dB steps −6 dB to +24 dB (for preamplifier gain of 6 dB) Single-ended preamplifier input and differential VGA output Supplies: 3.3 V to 10 V (with VMID enabled) ±3.3 V to ±5 V (with VMID disabled) Power: 93 mW with 3.3 V supplies Power-down for VGA, driver amplifier, and system APPLICATIONS Digital AGC systems Tx/Rx signal processing Power line transceivers FUNCTIONAL BLOCK DIAGRAM 32 2 3 6 31 30 1.5kΩ 1kΩ 29 28 27 26 25 1kΩ 1.5kΩ GM HIGH CURRENT DRIVER 9 24 23 22 21 VMID 4 1 AD8260 VMDO TXEN VMDI VNCM VPSB ENBL VGAP VGAN VNGR VPSR GNS3 GNS2 GNS1 GNS0 PRAO VNGR VOCM INPP INRP INRN INPN TXFB VNEG VNEG TXOP TXOP VPOS VPOS VPSR VMDO PRAI FDBK 5 7 8 10 11 12 13 14 16 15 17 18 19 20 BIAS VGA/PREAMPLIFIER ATTENUATOR GM STAGES LOGIC ×1 +– Figure 1. Functional Block Diagram GENERAL DESCRIPTION The AD8260 includes a high current driver, usable as a transmitter, and a low noise digitally programmable variable gain amplifier (DGA), useable as a receiver. The receiver section consists of a single-ended input preampli- fier, and linear-in-dB, differential-output DGA. The receiver has a small signal –3 dB bandwidth of 230 MHz; the driver small signal bandwidth is 195 MHz. The driver delivers ±300 mA, well suited for driving low impedance loads, even when connected to a 3.3 V supply. The AD8260 DGA is ideal for trim applications and has a gain span of 30 dB, in 3 dB steps. Excellent bandwidth uniformity is maintained across the entire frequency range. The low output- referred noise of the DGA is advantageous in driving high speed ADCs. The differential output facilitates the interface to modern low voltage high speed ADCs. Single-supply and dual-supply operation makes the part versatile and enables gain control of negative-going pulses, such as those generated by photodiodes or photo-multiplier tubes, as well as processing band-pass signals on a single supply. For maximum dynamic range, it is essential that the part be ac-coupled when operating on a single supply. The AD8260 preamplifier (PrA) is configured with external resistors for gains greater than 6 dB and can be inverting or noninverting. The DGA is characterized with a noninverting preamplifier gain of 2×. The attenuator has a range of 30 dB and the output amplifier has a gain of 8× (18.06 dB). The lowest noninverting gain range is −6 dB to +24 dB and shifts up with increased preamplifier gain. The gain is controlled via a parallel port (Pin GNS0 to Pin GNS3) with 10 gain steps of 3 dB per code. The preamplifier and DGA are disabled for any code that is not assigned a gain step. The AD8260 can operate with single or dual supplies from 3.3 V to ±5 V. An internal buffer normally provides a split supply reference for single-supply operation; an external reference can also be used when the VMID buffer is shut down. The operating temperature range is −40°C to +105°C. The AD8260 is available in a 5 mm × 5 mm, 32-lead LFCSP. |
Numéro de pièce similaire - AD8260ACPZ-R7 |
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Description similaire - AD8260ACPZ-R7 |
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