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部品型式

AD890AJP

製品説明
仕様・特性

ANALOGDEVICES fAX-ON-DEMAND HOTLINE - Page 2 ~ ANALOG W DEVICES Precision, ideband W Channel rocessing P Element FEATURES An 80MHz Bandwidth Permitting a 50Mb/s Data Transfer Rate A Variable Gain Amplifier with JOdB max Gain and 40dB Control Range Two Gain of 4 RF Buffers 200n Differential load Drive Capability A Pair of Precision Rectifiers AGC level and Threshold Outputs An Averaging, High Gain Sample-and-Hold for Accurate AGC Operation Typical Gain Drift in Hold Mode: 0.2dB/ms Gains Trimmed and Temperature Compensated AGC Operation Independent of AGC level Symmetrical AGC Attack/Decay Times 1J.ls AGC Attack/Decay Times Using a 1000pF External Capacitor Suitable for Use as an Accurate Video Programmable Gain Amplifier Dynamic Clamp Ensures Fast Recovery After Write to Read Transients AGC RF Output level is Internally Preset OBS o~~" 11\.0890 .0'40. ' i"""'i;1,, '.\Jil "' i., ,~.. ... iI ' '' , ""n~ ' ' . . . . ... O~!t~ ,..0&90. . . . . ,.. , ~9o etrrnrlt """,' OLE PRODUCT DESCRIPTION The AD890 is primarily intended for high-performance disk subsystem use and as such it is configured around the classic read channel processing block diagram. It is intended to be connected between the head preamplifier and the qualification circuitry required for digital data recovery. When used with the A0891 rigid disk data qualifier, data transfer rates in excess of SOMb/s can be processed. A temperature-compensated AGC loop, with an exponential transfer characteristic, permits optimal settling and allows for predictable performance in the classic single integrator control loop configuration. Fast acquisition and low droop while in the hold mode allow for AGC operation to be performed within the sector header without compromising channel behavior when reading data. Threshold" output may be used lor creating a dara qualification level. A second rectifier is used to drive the sample-and-hold circuitry. TE The 80MHz bandwidth of the A0890 ensures good phase linearity up to SOMHz. Thus, data transfer rates in excess of SOMbfscan be supported with good error rates and predictable channel behavior. The AD890 is available in both a 24-pill, slim-line cerdip package and in a 28-pin PLCC package and is specified to operarc over the 0 to 70DCcommercial temperatUre range. NEGATIVE ,",uT GAIN SET 1 J SAMPt' 'NO,HOLD ,. CAP4C"OH g~rg~~'o The AD890 processing clement has the flexibility to perform both continuous and sampled AGC functions; it is also ideal for embedded, dedicated, or mixed servo applications. Two userdefined filter/equalizer stages may be employed, thus allowing maximum design flexibility. This greatly simplifies the design of the overall channel characteristics. Using the AD890, the designer no longer needs to resort 10 passive techniques to isolate network functions; this avoids problems of signal loss and interaction. Two low-offset, IOOMHzfull-wave rectifiers provide the capability to track a 1V peak signal. The rectifier generating the "Qualifier Information furnished by Analog Devicl!$ is believed to be and reliable. However, no responsibility is assumed by Analog for its use; nor for any infringements of patents or other rights parties which may result from its use. No license is granted by tion or otherwise under any patent or patent rights of Analog --- accurate Devices of third implica' Devices. 211~~~;~~' HEttj~"H I, I 201 ~~~t%~ , . "I N~:::J\yE r~~~~~:~~D 1 . 'NPU' "'CTJ'~H I "'CT""R ',,"UTI.. ..1 NEGAtlv, OUTPUT 111 N~~:,j\VE NJ~~;~~E I " ~b';~i:i 117 Functional Block Diagram One Tec:hnology Way; P. O. Box 9106; Norwood, MA 02062-9106 Tel: 617/329-4700 TWX: 710/394-6577 West Coast Central Atlantic 714/641-9391 214/231-5094 215/643-7790

ブランド

AD

会社名

Analog Devices

本社国名

U.S.A

事業概要

半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。

供給状況

 
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