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| ADVANCEthis data sheet is preliminary INFORMATION All information in and subject to change. 6/98 Direct-Conversion Tuner IC for Digital DBS Applications General Description ____________________________Features o Low-Cost Bipolar Design, Lowest Cost Architecture o Operates from Single +5V Supply o 950MHz to 2150MHz Input Frequency Range* o On-Chip Quadrature Generator, Dual-Modulus Prescaler (/64, /65) o Input Levels: -19dBm to -60dBm per Carrier o Over 41dB AGC Control Range o Noise Figure = 13.5dB; IIP3 = 6.5dBm (at 1450MHz) o Automatic Baseband Offset Correction o Easy Interface to MAX1002/MAX1003 Dual ADC and Popular Baseband ICs o Evaluation Kit Available, Tuner Reference Design Assistance Available *Contact factory for MAX2105 versions with expanded frequency range. MAX2105 The MAX2105 is a low-cost, direct-conversion tuner IC designed for use in digital direct-broadcast satellite (DBS) television set-top box units. Its direct-conversion architecture reduces system cost compared to devices with IF-based architectures. The MAX2105 directly tunes L-band signals to baseband using a broadband I/Q downconverter. Its operating frequency range spans from at least 950MHz to 2150MHz. The IC includes an LNA with AGC, two downconverter mixers, an oscillator buffer with 90 quadrature generator and prescaler, and baseband amplifiers. The MAX2105 has lower conversion gain than the MAX2102; this accommodates additional front-end gain, reducing overall system noise figure. Applications DirecTV, PrimeStar, EchoStar DBS Tuners DVB-Compliant DBS Tuners Cellular Base Stations Wireless Local Loop Broadband Systems LMDS Ordering Information PART MAX2105CWI TEMP. RANGE 0C to +70C PIN-PACKAGE 28 Wide SO Functional Diagram VCC 14 QOUT 13 GND 12 GND 11 AGC 10 GND 9 RFIN 8 RFIN 7 -60...-19dBm Q I VCC 6 GND 5 VCC 4 GND 3 IOUT 2 VCC 1 MAX2105 OFFSET CORRECTION 15 QDC 16 QDC 17 IDC 18 IDC 19 GND 20 0 90 /64, /65 21 LO 22 LO 23 VCC 24 GND 25 PSGND 26 PSOUT 27 MOD 28 VCC VCC ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. |
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