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MAX2321 Datasheet(PDF) 16 Page - Maxim Integrated Products |
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MAX2321 Datasheet(HTML) 16 Page - Maxim Integrated Products |
16 / 28 page ![]() Adjustable, High-Linearity, SiGe Dual-Band LNA/Mixer ICs 16 ______________________________________________________________________________________ MAX2322 Operation The MAX2322 is a lower-cost PCS-only version that can be installed as a drop-in replacement for the dual-band versions. It consists of a PCS LNA, PCS mixer, pin- selectable LO frequency doubler, and LO buffer. Logic input SHDN = VCC / GND turns on/off the entire IC except the LO buffer. The LOX2 logic input controls the LO frequency doubler. LOX2 = GND disables the dou- bler when using a PCS band VCO, and LOX2 = VCC activates the doubler when using a cellular-band VCO. GAIN and LIN logic inputs control the MAX2322’s three operational modes, as summarized in Table 2. MAX2324 Operation The MAX2324 is a lower-cost cellular-only version that can be installed as a drop-in replacement for the dual- band versions. It consists of a cellular LNA, cellular dig- ital mixer, cellular FM mixer, and LO buffer. A SHDN logic input turns on/off the entire IC except the LO buffer. GAIN and LIN logic inputs control the MAX2324’s three operational modes, as summarized in Table 3. MAX2327 Operation The MAX2327 is similar to the MAX2320 except it only features an HGLL mode, and either LO output buffer is selectable during shutdown. It consists of PCS and cel- lular LNAs; PCS, cellular digital, and cellular FM mixers; and PCS and cellular LO buffers. A SHDN logic input turns on/off the entire IC except the LO buffer. BAND and MODE logic inputs control the MAX2327’s three operational modes, as summarized in Table 4. Applications Information Cascaded LNA/Mixer Performance The LNA and mixer design aims at optimizing cascad- ed performance in all gain and linearity modes. In high- gain, high-linearity mode, both the LNA and mixer have a low noise figure, high gain, and high linearity. The LNA has high gain to minimize the noise contribution of the mixer, thus increasing the receiver’s sensitivity and extra-high linearity for superior cross-modulation sup- pression. The HGLL mode is used when the transmitter is off and cross-modulation is not a concern. In low- gain, high-linearity mode, the received signal is strong enough that linearity is the primary concern. The LNA gain is reduced for higher system linearity. Tables 5 and 6 summarize the cascaded performance. S Parameters The S parameters are listed in Tables 7–11. An electron- ic copy is also available at www.maxim-ic.com /MAX2320/S_table/. Table 2. MAX2322 Operational Modes Table 4. MAX2327 Operational Modes OPERATIONAL MODE Not used. Digital PCS Mode. The LNA and mixer are in HGLL mode. FM Mode. The cellular FM mixer is selected. Digital Cellular Mode. The cellular digi- tal mixer is selected. BAND L L H H MODE L H L H OPERATIONAL MODE FM Mode. The LNA is in HGLL mode. The FM mixer and the associated LO buffer are selected. Low-Gain, High-Linearity (LGHL) Cellular Mode. The LNA and digital mixer are in LGHL mode. High-Gain, Low-Linearity (HGLL ) Cellular Mode. The LNA and digital mixer are in HGLL mode. High-Gain, High-Linearity (HGHL ) Cellular Mode. The LNA and digital mixer are in HGHL mode. GAIN L L H H LIN L H L H OPERATIONAL MODE Not used. Low-Gain, High-Linearity (LGHL) PCS Mode. The LNA and mixer are in LGHL mode. High-Gain, Low-Linearity (HGLL) PCS Mode. The LNA and mixer are in HGLL mode. High-Gain, High-Linearity (HGHL) PCS Mode. The LNA and mixer are in HGHL mode. GAIN L L H H LIN L H L H Note: L = Logic Low; H = Logic High Note: L = Logic Low; H = Logic High Note: L = Logic Low; H = Logic High Table 3. MAX2324 Operational Modes |
Similar Part No. - MAX2321 |
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Similar Description - MAX2321 |
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