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| M I C R O T U NE RF SILICON AND SYSTEMS SOLUTIONS FOR BROADBAND COMMUNICATIONS, AUTOMOTIVE ELECTRONICS AND WIRELESS CONNECTIVITY MT1560 UPSTREAM AMPLIFIER PRODUCT BRIEF The MT1560 is a 3.3V programmable gain upstream amplifier. MT1560 Upstream Amplifier The Microtune(R) MT1560 is a lowcost programmable-gain power amplifier IC for use in CATV upstream applications. The MT1560 is a 3.3 volt part optimized for the DOCSIS 2.0 upstream standard. The device's specified frequency range is from 5MHz to 65MHz, and can output 67dBmV through a 1:1 impedance-ratio transformer. A 3wire digital serial bus controls the variable gain, with gain control available in 1dB steps and a nominal 59dB gain range. The MT1560 may be disabled via an external control pin. The transmitdisable mode not only minimizes output noise by shutting off the output stage, but also maintains its output impedance at nominal levels. Output transients are nominally less than 16mVp-p at 61dBmV output level during transmit enable/disable switching. Operating from a single +3.3V supply, the amplifier's typical current draw at maximum gain, or minimum attenuation, is 212mA. Additional internal circuitry reduces the amplifier's power consumption depending on gain setting. Transmit-disable mode power supply current is reduced to a nominal of 18mA. A shutdown mode further reduces current to a nominal of 80A. The MT1560 is available in a 20pin MicroLeadFrameTM package with an exposed pad for the extended industrial temperature range of -40C to +85C. MT1560 APPLICATIONS * * * Cable modems Telephony over cable Set-top box CATV FEATURES * * Maximum output level of 67dBmV Low power-up/down transients of 16mVp-p typical at 61dBmV output Ultra low third harmonic distortion Single +3.3V supply 59dB gain range Gain programmable in 1dB steps Low transmit output noise floor: -51dBmV in 160kHz Low transmit-disable output noise: -68dBmV Two power-down modes DOCSIS 2.0 compatible * * * * * * * * MICROTUNE MT 1 56 0 UP ST RE A M A MP LI FI ER PRODUCT BRIEF DC ELECTRICAL CHARACTERISTICS Supply voltage Supply current, shutdown mode 80 212 2.0 0.7 0 NC 3.15 3.45 125 V A mA V V A SUPPLY CURRENT, TRANSMIT MODE Gain code = 52 to 63 20 19 17 18 DIGITAL INPUT High voltage Low voltage Current GND1 Vin+ Vin1 2 3 4 5 15 14 13 12 11 NC Vout+ VoutNC Vcm AC ELECTRICAL CHARACTERISTICS PARAMETER Output 1dB compression point Output step size Gain accuracy MIN TYP 70 1 59 -29.5 29.5 0.0 0.1 MAX UNIT dBmV dB dB dB dB dB dB DGND CS VOLTAGE GAIN GAIN RESPONSE Fin = 42MHz Fin = 65MHz 10 GND2 6 7 8 9 SHDN Gain code = 4 Gain code = 63 SCLK SDA TXEN TXEN enable/disable time TXEN transient duration TXEN transient step size, VOUT = 61dBmV TXEN transient step size, min gain 5 1.5 16 64 7 1.55 16 s s mVp-p VCC1 MT1560 Pin Diagram INPUT/OUTPUT Input impedance Output return loss, Z0 = 75 k dB VIN+ VCC2 mVp-p TXEN 16 GND2 Vrsns Vcc1 Vcc2 PARAMETER MIN TYP MAX UNIT Vcc VOUT+ 1:1 Ohms Input Amplifier Variable Attenuator Power Amp RFout VCM STRESS RATINGS PARAMETER VCC (VCC1, VCC2) VOUT+, VOUTInput voltage levels (all inputs), VCM Junction temperature Storage temperature range Lead temperature (soldering, 4 seconds) -40 VIN- 0.1 F CEXT MIN -0.7 -0.7 -0.7 MAX 5 5.5 VCC + 0.7 +125 +150 +245 UNIT V V V DGND SHDN SCLK Serial Interface PA Control VOUTVRSNS RSNS 4.70 k 1% 0.1 F C C C MT1560 Block Diagram Microtune, Inc., 2201 Tenth Street, Plano, TX 75074, USA Tel: +1-972-673-1600, Fax: +1-972-673-1602, E-mail: sales@microtune.com, Web site: www.microtune.com For a detailed list of design centers, sales offices, and sales representatives, visit our Web site at www.microtune.com. The information in this document is believed to be accurate and reliable. Microtune assumes no responsibility for any consequences arising from the use of this information, nor from any infringement of patents or the rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or other rights of Microtune. The information in this publication replaces and supersedes all information previously supplied, and is subject to change without notice. The customer is responsible for assuring that proper design and operating safeguards are observed to minimize inherent and procedural hazards. Microtune assumes no responsibility for applications assistance or customer product design. The devices described in this document are not authorized for use in medical, life-support equipment, or any other application involving a potential risk of severe property or environmental damage, personal injury, or death without prior express written approval of Microtune. Any such use is understood to be entirely at the user's risk. Microtune is a registered trademark of Microtune, Inc. MicroTuner, MicroStreamer, VideoCaster, and the Microtune logo are trademarks of Microtune, Inc. Bluetooth is a trademark owned by Bluetooth SIG, Inc. and is used by Microtune under license. All other trademarks belong to their respective companies. Microtune's products are protected by one or more of the following U.S. patents: 5,625,325; 5,648,744; 5,717,730; 5,737,035; 5,739,730; 5,805,988; 5,847,612; 6,100,761; 6,104,242; 6,144,402; 6,163,684; 6,169,569; 6,172,378; 6,177,964; 6,211,745; 6,218,899; 6,268,778; 6,310,387; 6,323,736; 6,355,537; 6,429,502; 6,462,327; D469,742 and additional patents pending or filed. Entire contents Copyright (c) 1996 - 2003 Microtune, Inc. PB-00059 -- Rev 1.1 TXEN SDA CS FEB 2003 |
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