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MAX2682 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX2682 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page Detailed Description The MAX2680/MAX2681/MAX2682 are 400MHz to 2.5GHz, silicon-germanium, double-balanced down- converter mixers. They are designed to provide opti- mum linearity performance for a specified supply current. They consist of a double-balanced Gilbert-cell mixer with single-ended RF, LO, and IF port connec- tions. An on-chip bias cell provides a low-power shut- down feature. Consult the Selector Guide for device features and comparison. Applications Information Local-Oscillator (LO) Input The LO input is a single-ended broadband port with a typical input VSWR of better than 2.0:1 from 400MHz to 2.5GHz. The LO signal is mixed with the RF input sig- nal, and the resulting downconverted output appears at IFOUT. AC-couple LO with a capacitor. Drive the LO port with a signal ranging from -10dBm to 0 (50 Ω source). RF Input The RF input frequency range is 400MHz to 2.5GHz. The RF input requires an impedance-matching network as well as a DC-blocking capacitor that can be part of the matching network. Consult Tables 1 and 2, as well as the RF Port Impedance vs. RF Frequency graph in the Typical Operating Characteristics for information on matching. IF Output The IF output frequency range extends from 10MHz to 500MHz. IFOUT is a high-impedance, open-collector output that requires an external inductor to VCC for proper biasing. For optimum performance, the IF port requires an impedance-matching network. The configu- ration and values for the matching network is depen- dent upon the frequency and desired output impedance. For assistance in choosing components for optimal performance, refer to Tables 3 and 4 as well as the IF Port Impedance vs. IF Frequency graph in the Typical Operating Characteristics. Power-Supply and S SH HD DN N Bypassing Proper attention to voltage supply bypassing is essen- tial for high-frequency RF circuit stability. Bypass VCC with a 10µF capacitor in parallel with a 1000pF capaci- tor. Use separate vias to the ground plane for each of the bypass capacitors and minimize trace length to reduce inductance. Use separate vias to the ground plane for each ground pin. Use low-inductance ground connections. Decouple SHDN with a 1000pF capacitor to ground to minimize noise on the internal bias cell. Use a series resistor (typically 100 Ω) to reduce coupling of high-fre- quency signals into the SHDN pin. Layout Issues A well designed PC board is an essential part of an RF circuit. For best performance, pay attention to power- supply issues as well as to the layout of the RFIN and IFOUT impedance-matching network. 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers _______________________________________________________________________________________ 9 179-j356 MAX2680 Table 1. RFIN Port Impedance 54-j179 32-j94 33-j73 FREQUENCY 75-j188 209-j332 MAX2681 34-j108 33-j86 78-j182 206-j306 MAX2682 34-j106 29-j86 Table 2. RF Input Impedance-Matching Component Values 270pF 86nH Z1 1.5pF Short MAX2680 22nH 270pF Z2 270pF 270pF Open Open Z3 1.8nH 1.8nH Note: Z1, Z2, and Z3 are found in the Typical Operating Circuit. 270pF 68nH 1.5pF Short MAX2681 18nH 270pF 270pF 270pF Open 0.5pF 1.8nH 2.2nH 1.5pF 68nH Short Short MAX2682 270pF 270pF 270pF 270pF 10nH 0.5pF 2.2nH 1.2nH 900 MHz 1950 MHz 2450 MHz 900 MHz 1950 MHz 2450 MHz 400 MHz 900 MHz 1950 MHz 400 MHz 2450 MHz 400 MHz 900MHz 1950MHz 2450MHz PART 400MHz FREQUENCY MATCHING COMPONENTS |
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