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MAX2700ECM Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX2700ECM Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 28 page General Description The MAX2700/MAX2701 are highly integrated direct downconversion (zero-IF) receivers designed for wide- band wireless local loop (WLL) systems operating in the 1.8GHz to 2.5GHz band. The MAX2700/MAX2701s’ zero-IF architecture eliminates the need for IF down- conversion stages and the use of an IF SAW filter. This reduces the overall receiver cost by reducing the com- ponent count and required board space. The MAX2700/MAX2701 have three main blocks: low- noise amplifier (LNA), quadrature downconverter, and baseband variable gain amplifiers (VGAs). The LNA is a single-ended amplifier with selectable gain and shut- down options. It provides a high input third-order inter- cept point (IP3), which reduces cross-modulation and gain compression due to high-level RF interference. The quadrature downconverter section consists of two highly linear double-balanced mixers driven by an external local oscillator (LO) with a selectable LO dou- bler. The double-balanced mixers are optimized to pro- vide high input IP3 and minimum added noise. The mixers’ high input second-order intercept point (IIP2) helps minimize receiver desensitization due to high- level AM-modulated interferers. The two baseband VGAs in each channel provide 80dB of total maximum gain and greater than 60dB of gain control. The first AGC amplifier is optimized for low noise, low power dissipation, and high linearity over the entire gain range to ensure high gain compression per- formance. An external lowpass filter between baseband VGAs provides the required channel selectivity at the adjacent channel. An integrated gain offset correction loop circuit provides <0.3dB amplitude mismatch between the I and Q channels. The MAX2700/MAX2701 operate from a single +2.7V to +3.3V power supply, drawing only 165mA of supply current and 20µA in shutdown mode. Both devices are available in small 48-pin TQFP packages with exposed paddle (EP) for optimum high-frequency performance. ________________________Applications Wireless Local Loop Wideband Direct-Sequence Spread-Spectrum Systems Two-Way MMDS Wideband 2.4GHz ISM Radios Digital Microwave Radios Features o Input Frequency Range 1.8GHz to 2.1GHz (MAX2700) 2.1GHz to 2.5GHz (MAX2701) o Cascaded Performance at 1960 MHz 3.5dB Noise Figure -7.5dBm Input IP3 at Maximum Gain o LNA with Selectable Gain and Shutdown Option o High Linearity Direct I/Q Downconverter o Wideband LO Quadrature Generator o 3dB Baseband Channel Bandwidth of At Least 56MHz o Variable Gain Baseband Amplifiers with >60dB Control Range o Baseband Gain Offset Correction Loop o +2.7V to +3.3V Single-Supply Operation o Small 48-pin TQFP-EP Package 1.8GHz to 2.5GHz Direct Downconversion Receivers ________________________________________________________________ Maxim Integrated Products 1 IIN2- DCI2+ DCI2- IOUT2 GND RFIN- RFIN+ VCC QOUT2 DCQ2- DCQ2+ QIN2- CEXT- CEXT+ VCC X2_EN GND LNAIN GND GND GAIN_SET SHDN AGC VCC 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 TQFP-EP MAX2700 MAX2701 TOP VIEW Pin Configuration 19-1667; Rev 0; 4/00 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX2700ECM -40°C to 85°C 48 TQFP-EP MAX2701ECM -40°C to 85°C 48 TQFP-EP |
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