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| M I C R O T U N E(R) RF SILICON AND SUBSYSTEMS SOLUTIONS FOR BROADBAND COMMUNICATIONS AND AUTOMOTIVE ELECTRONICS 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 Amplifier 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 temperaturecompensated 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 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 FEATURES MICROTUNE M T12 30 I F V ARI ABL E GAIN AMPLI FI ER PRODUCT BRIEF TERMINAL CONNECTIONS PIN 1 2 3 4 5 6 7 8 FUNCTION/SYMBOL VCC IN1 IN2 VAGC GND OUT2 OUT1 GND DESCRIPTION Supply Amplifier input 1 Amplifier input 2 Gain control Ground Amplifier output 2 Amplifier output 1 Ground 2 IN1 3 IN2 OUT2 6 OUT1 7 AC ELECTRICAL CHARACTERISTICS PARAMETER Voltage gain, minimum, VAGC = 0.7 Voltage gain, maximum, VAGC = 3.3 AGC range Gain variation, over 6 MHz Frequency range <1 dB rolloff <3 dB rolloff Noise figure AV = 54 dB AV = 30 dB Output IM3, gain adjusted for VOUT = 51 dBmV, AV > 30 dB Output IP3, gain adjusted for VOUT = 51 dBmV, AV > 30 dB 1 dB compression input Input impedance Output impedance 80 34 2.21.7 34 dB Linear and Temperature Compensation MIN 54 24 TYP 57 42 0.5 MAX 30 UNIT dB dB dB dB MHz MHz dB dB MT1230 Typical Application 60 95 9.5 16 -53 4 VAGC MT1230 RF Input Tuner IF SAW Filter IF IF Demodulator dBc dBmV dBmV kpF AGC DC ELECTRICAL CHARACTERISITICS PARAMETER Supply voltage Supply current Gain control voltage VAGC input impedance MT1230 Block Diagram MAX 5.5 24 3.3 MIN 4.5 TYP 20 UNIT V mA V k 0.7 60 Top View ABSOLUTE MAXIMUM RATINGS PARAMETER VCC Input voltage levels (all inputs), VCM Junction temperature Storage temperature range Lead temperature (soldering, 10 seconds) -55 VCC 1 8 GND 7 OUT1 6 OUT2 5 GND MIN -0.7 -0.7 MAX 5.5 VCC + 0.7 +100 +150 +245 UNIT V V C C C IN1 2 IN2 3 VAGC 4 MT1230 Pin Configuration 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, DataCaster, and the Microtune logo are trademarks of Microtune, Inc. 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; 6,535,068; 6,580,313; 6,608,522; 6,631,257; 6,714,776; 6,725,463; 6,744,308 B1; 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 (c) 1996 - 2005 Microtune, Inc. 072105 MT1230 PB-00012 -- Rev 1.6 AUGUST 2005 |
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