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MAX2685 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX2685 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 10 page General Description The MAX2685’s low-noise amplifier (LNA) and down- converter mixer comprise the major blocks of an RF front-end receiver. Optimized for 900MHz operation, the device’s low noise figure, high gain, and high linear- ity make it ideal for cellular, cordless, and wireless data applications. A low supply current of 8.5mA (high-gain mode) and 3.8mA (low-gain mode) plus a low operating supply voltage range of +2.7V to +5.5V make it suitable for use in 3-cell NiCd or 1-cell lithium-ion (Li+) battery applications. A low-power shutdown mode further extends battery life by reducing supply current below 0.1µA. The MAX2685 includes an LNA, LNA bypass switch, downconverter mixer, and local-oscillator (LO) buffer. The LNA has a low noise figure of 1.4dB, a high gain of 15dB, and an input third-order intercept point (IP3) of -4dBm. The mixer has a noise figure of 13dB, a gain of 6dB, and an input IP3 of +7dBm. In addition, an LNA bypass switch allows two levels of gain, reducing power consumption when high gain is not needed. The downconverter mixer has a single-ended RF input port and differential IF output ports. Differential opera- tion of the IF ports offers improved even-order harmonic rejection and increased immunity to noise. An LO buffer allows the LO port to be driven with only -8dBm of LO power. The MAX2685 is offered in a space-saving 16- pin QSOP package. Applications Cellular/Cordless Phones 900MHz ISM-Band Radios Wireless Data 868MHz European ISM Band Features o 800MHz to 1000MHz RF Frequency Range o +2.7V to +5.5V Single-Supply Operation o Integrated LNA + Mixer + LO Buffer o Logic-Controlled LNA Bypass Switch Reduces Supply Current o LNA Performance (High/Low Gain) Gain: +15dB/-12dB NF: 1.4dB/12dB Input IP3: -4dBm/+16dBm o Mixer Performance (High/Low Gain) Gain: 6dB/4.6dB NF: 13dB/12dB Input IP3: +7dBm/-1.5dBm o Supply Current 8.5mA (High Gain) 3.8mA (Low Gain) o <0.1µA Supply Current in Shutdown Mode o 0.8µs Receiver Enable Time Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer ________________________________________________________________ Maxim Integrated Products 1 VCC IFOUT+ IFOUT- MAX2685 LNAIN GAIN LNA LO LNAOUT MIXIN LNA BYPASS LO BUFFER MIXER SHDN POWER MANAGEMENT GND 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 LNAOUT GND VCC VCC MIXIN GND GND IFOUT+ IFOUT- TOP VIEW MAX2685 QSOP LNAIN SHDN GAIN GND GND LO GND Functional Diagram 19-1493; Rev 1; 12/00 PART MAX2685EEE -40°C to +85°C TEMP. RANGE PIN-PACKAGE 16 QSOP EVALUATION KIT AVAILABLE Pin Configuration Ordering Information For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. |
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