PDF AD8322 Data sheet ( Hoja de datos )

Número de pieza	AD8322
Descripción	5 V CATV Line Driver Coarse Step Output Power Control
Fabricantes	Analog Devices
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No Preview Available ! a 5 V CATV Line Driver Coarse Step Output Power Control AD8322 FEATURES Supports DOCSIS Standard for Reverse Path Transmission Gain Programmable in 6 dB Steps Over a 42 dB Range Low Distortion at 60 dBmV Output –58 dBc SFDR at 21 MHz –56 dBc SFDR at 42 MHz Output Noise Level –46 dBmV in 160 kHz Bandwidth Maintains 75 ⍀ Output Impedance Power-Up and Power-Down Condition 180 MHz Bandwidth 5 V Supply Operation Supports SPI Interfaces APPLICATIONS Gain Programmable Line Driver DOCSIS-Compliant Data Modems Interactive Set-Top Boxes PC Plug-in Modems General-Purpose Digitally Controlled Variable Gain Block FUNCTIONAL BLOCK DIAGRAM VCC (7 PINS) R1 AD8322 VIN+ VIN– DIFF OR SINGLE INPUT AMP BUFFER R2 ZIN (SINGLE) = 210⍀ ZIN (DIFF) = 235⍀ ATTENUATION CORE 8 DECODE 8 DATA LATCH POWER AMP ZOUT DIFF = 75⍀ POWER-DOWN LOGIC VOUT+ VOUT– 8 SHIFT REGISTER DATEN DATA CLK GND (12 PINS) PD GENERAL DESCRIPTION The AD8322 is a low-cost, digitally controlled variable gain ampli- fier optimized for coaxial line driving applications such as cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output gain over a 42.14 dB range, with gain steps of 6.02 dB/major carry. The AD8322 comprises a digitally controlled variable attenuator of 0 dB to –42.14 dB, which is preceded by a low-noise, fixed-gain buffer and is followed by a low-distortion, high-power ampli- fier. The AD8322 accepts a differential or single-ended input signal. The output is specified for driving a 75 Ω load, such as coaxial cable. Distortion performance of –58 dBc is achieved with an output level up to 60 dBmV at 21 MHz bandwidth. A key performance and cost advantage of the AD8322 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 termination resulting in twice the effective output voltage when compared to a standard operational amplifier. The AD8322 is packaged in a low-cost 28-lead TSSOP, operates from a single 5 V supply, and has an operational temperature range of –40°C to +85°C. –55 fO = 42MHz VO = 60dBmV @ MAX GAIN –60 HD3 –65 HD2 –70 –75 1 24 8 16 32 64 128 GAIN CODE – Decimal Figure 1. Harmonic Distortion vs. Gain Control 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. 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., 2000 1 page Typical Performance Characteristics–AD8322 +1/2 VIN –1/2 VIN 75⍀ 75⍀ 5V 10␮F 0.1␮F 0.1␮F 432⍀ VIN+ VCC OUT+ AD8322 0.1␮F VIN– BYP OUT– GND 0.1␮F 0.1␮F 1:1 0.1␮F TOKO 617DB-A0070 CL DEVICE UNDER TEST TPC 1. Test Circuit + 75⍀ VO – 0.15 0.10 f = 10MHz 0.05 0.00 –0.05 f = 5MHz f = 42MHz –0.10 –0.15 f = 65MHz –0.20 –0.25 –0.30 –0.35 1 2 4 8 16 32 64 GAIN CONTROL – Decimal TPC 2. Gain Error vs. Gain Control 128 32 PO = 60dBmV @ MAX GAIN 30 CL = 0pF 28 CL = 10pF CL = 20pF 26 CL = 50pF 24 1 10 100 FREQUENCY – MHz TPC 4. AC Response for Various Capacitor Loads 36 GC128 30 GC64 24 GC32 18 12 GC16 GC8 6 GC4 0 GC2 –6 GC1 –12 –18 1 10 100 FREQUENCY – MHz 1k TPC 3. AC Response vs. Gain Control f = 10MHz –32 PD = 1 –36 –40 –44 –48 1 2 4 8 16 32 64 GAIN CODE – Decimal TPC 5. Output Noise vs. Gain Code 128 REV. 0 –5– 5 Page AD8322 Figure 9. Screen Display of Windows-Based Control Software REV. 0 –11– 11 Page

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