MT1560 MICROTUNE | Alldatasheet

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RF SILICON AND SYSTEMS SOLUTIONS FOR BROADBAND COMMUNICATIONS, AUTOMOTIVE ELECTRONICS AND WIRELESS CONNECTIVITY M I C R O T U N E M I C R O T U N E MT1560 UPSTREAM AMPLIFIER PRODUCT BRIEF The MT1560 is a 3.3V programmable gain upstream amplifier. The Microtune® MT1560 is a low- cost 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 3- wire 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 transmit- disable 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 80µA. The MT1560 is available in a 20- pin MicroLeadFrame™ package with an exposed pad for the extended industrial temperature range of -40°C to +85°C. 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 MT1560 Upstream Amplifier

PB-00059 — Rev 1.1 FEB 2003 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 consequen ces arising from the use of this information, nor from any infringement of patents o r 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 procedura l 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 © 1996 - 2003 Microtune, Inc. DC ELECTRICAL CHARACTERISTICS High voltage 2.0 V Low voltage 0.7 V Current 0 µA AC ELECTRICAL CHARACTERISTICS TXEN TXEN enable/disable time 5 µs TXEN transient duration 1.5 µs TXEN transient step size, VOUT = 61dBmV 16 64 mVp-p TXEN transient step size, min gain 7 mVp-p INPUT/OUTPUT Input impedance 1.55 kΩ Output return loss, Z0 = 75Ω 16 dB STRESS RATINGS PARAMETER M IN M AX U NIT VCC (VCC1, VCC2) -0.7 5 V VOUT+, VOUT- -0.7 5.5 V Input voltage levels (all inputs), VCM −0.7 VCC + 0.7 V Junction temperature +125 °C Storage temperature range -40 +150 °C Lead temperature (soldering, 4 seconds) +245 °C GND1 1 Vin+ 2 Vin- 3 DGND 4 CS 5 SDA 6 SCLK 7 TXEN 8 SHDN 9 GND2 10

11 Vcm

13 Vout-

14 Vout+

16 GND2

17 Vcc2

19 Vcc1

20 Vrsns

PARAMETER M IN TYP M AX U NIT Supply voltage 3.15 3.45 V Supply current, shutdown mode 80 125 µA SUPPLY CURRENT, TRANSMIT MODE Gain code = 52 to 63 212 mA DIGITAL INPUT PARAMETER M IN TYP M AX U NIT Output 1dB compression point 70 dBmV Output step size 1 dB Gain accuracy 59 dB VOLTAGE GAIN Gain code = 4 -29.5 dB Gain code = 63 29.5 dB GAIN RESPONSE Fin = 42MHz 0.0 dB Fin = 65MHz 0.1 dB MT1560 Block Diagram MT1560 Pin Diagram Serial Interface PA Control VCC2 Variable Attenuator VCC1 Input Amplifier Power Amp VOUT+ VOUT- VCM VIN+ VIN- DGND SDA SCLK TXEN VRSNS RSNS 4.70 kΩ Vcc RFout 1:1 Ohms 0.1 µF 0.1 µF CEXT CS SHDN