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LT5500 Datasheet(PDF) 1 Page - Linear Technology |
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LT5500 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT5500 5500f TYPICAL APPLICATIO FEATURES DESCRIPTIO APPLICATIO S 1.8GHz to 2.7GHz Receiver Front End ■ 1.8V to 5.25V Supply ■ Dual LNA Gain Setting: +13.5dB/–14dB at 2.5GHz ■ Double-Balanced Mixer ■ Internal LO Buffer ■ LNA Input Internally Matched ■ Low Supply Current: 23mA ■ Low Shutdown Current: 2µA ■ 24-Lead Narrow SSOP Package The LT ®5500 is a receiver front end IC designed for low voltage operation. The chip contains a low noise amplifier (LNA), a Mixer and an LO buffer. The IC is designed to operate over a power supply voltage range from 1.8V to 5.25V. The LNA can be set to either high gain or low gain mode. At 2.5GHz, the high gain mode provides 13.5dB gain and a noise figure (NF) of 4dB. The LNA in low gain mode provides –14dB gain and an IIP3 of + 8dBm at 2.5GHz. The mixer has 5dB of conversion gain and an IIP3 of – 2.5dBm at 2.5GHz, with –10dBm LO input power. ■ IEEE 802.11 and 802.11b DSSS and FHSS ■ High Speed Wireless LAN ■ Wireless Local Loop Figure 1. 2.5GHz Receiver. Interstage Filter is Optional LO MIX_IN LO+ LO– LNA_OUT LNA_IN LNA_GND GND GS EN LT5500 MIX_GND VCC 2V IF– 5500 F01 IF+ 2V •• T2 8:1 IF RF C4 C17 C23 L3 L5 L7 IF OUTPUT RF INPUT L4 100pF ×2 L2 2V GAIN SELECT RF INPUT FILTER ENABLE 100pF 100pF L9 LO INPUT INTERSTAGE FILTER 100pF ×4 1nF 100pF 1µF LNA Gain (High Gain Mode) and Mixer Conversion Gain VCC (V) 1.5 13.4 13.6 13.7 5.5 5500 TA02 13.2 13.0 2.5 3.5 4.5 2 3 4 5 14.0 13.3 13.5 13.1 13.8 13.9 4.8 5.2 5.4 4.4 4.0 6.0 4.6 5.0 4.2 5.6 5.8 fRF = 2.5GHz TA = 25°C , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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