MT1230 MICROTUNE | Alldatasheet

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M I C R O T U N E® RF SILICON AND SUBSYSTEMS SOLUTIONS FOR BROADBAND COMMUNICATIONS AND AUTOMOTIVE ELECTRONICS M I C R O T U N E The Microtune MT1230 is a low-cost intermediate frequency (IF) variable-gain amplifier IC for use in digital cable TV (CATV), cable modem, internet protocol (IP) telephony, cable-ready TV, and digital TV systems. The MT1230 provides both a high impedance differential input and a low impedance differential output, making it immune to common mode noise and minimizing shielding requirements. Operating from a single +5V supply, the two-stage amplifier design typically draws 20 mA. The temperature- compensated analog control voltage produces a dB linear gain characteristic throughout the entire control voltage range. The MT1230 is available in an 8-pin TSSOP package.

APPLICATIONS

  • Cable modems
  • Telephony over cable
  • CATV set-top boxes
  • Cable-ready TVs
  • Digital TVs

FEATURES

  • Analog dB linear gain control characteristic
  • Temperature-compensated gain control
  • 57 dB maximum gain
  • Supply-independent voltage gain
  • 95 MHz bandwidth
  • Low distortion
  • Low noise
  • Low power consumption
  • Single +5V supply
  • 8-pin TSSOP package MT1230 IF VARIABLE-GAIN AMPLIFIER PRODUCT BRIEF The MT1230 IF variable-gain amplifier offers low distortion, low noise, and low power consumption. MT1230 IF Variable-Gain Amp ifiel r

MT12 30 I F V ARI ABL E GAIN AMPLI FIER PRODUCT BRIEF TERMINAL CONNECTIONS PIN FUNCTION/SYMBOL DESCRIPTION

1 VCC Supply

2 IN1 Amplifier input 1

3 IN2 Amplifier input 2

4 VAGC Gain control

5 GND Ground

6 OUT2 Amplifier output 2

7 OUT1 Amplifier output 1

8 GND Ground

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 r esult from its use. No license is granted by i mplication or otherwise under any pate nt 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, DataCaster, and the Microtune logo are trademarks of Microtune, Inc. A ll other trademarks belong to thei r respective companies. Microtune’s p roducts ar e p rotected b y on e or m ore of t he f ollowing U.S. p atents: 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; 6,771,124; 6,784,945; 6,804,099; 6,888,406; 6,891,435; 6,906,594; 6,909,886; D,469,742 and additional patents pending or filed. Entire contents Copyright © 1996 - 2005 Microtune, Inc. 072105 AC ELECTRICAL CHARACTERISTICS PARAMETER MIN TYP MAX UNIT Voltage gain, minimum, VAGC = 0.7 30 dB Voltage gain, maximum, VAGC = 3.3 54 57 dB AGC range 24 42 dB Gain variation, over 6 MHz 0.5 dB Frequency range <1 dB rolloff 60 MHz <3 dB rolloff 95 MHz Noise figure AV = 54 dB 9.5 dB AV = 30 dB 16 dB Output IM3, gain adjusted for VOUT = 51 dBmV, AV > 30 dB -53 dBc Output IP3, gain adjusted for VOUT = 51 dBmV, AV > 30 dB 80 dBmV 1 dB compression input 34 dBmV Input impedance 2.2⏐⏐1.7 kΩ⏐⏐pF Output impedance 34 Ω DC ELECTRICAL CHARACTERISITICS PARAMETER MIN TYP MAX UNIT Supply voltage 4.5 5.5 V Supply current 20 24 mA Gain control voltage 0.7 3.3 V VAGC input impedance 60 kΩ ABSOLUTE MAXIMUM RATINGS PARAMETER MIN MAX UNIT VCC -0.7 5.5 V Input voltage levels (all inputs), VCM -0.7 VCC + 0.7 V Junction temperature +100 °C Storage temperature range -55 +150 °C Lead temperature (soldering, 10 seconds) +245 °C dB Linear and Temperature Compensation

2 IN1

3 IN2

4 VAGC

MT1230 Typical Application RF Input Tuner SAW Filter Demodulator AGC MT1230 IFIFIF MT1230 Block Diagram Top View VCC 1 IN1 2 IN2 3 VAGC 4

8 GND

7 OUT1

6 OUT2

5 GND

MT1230 PB-00012 — Rev 1.6 AUGUST 2005