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MAX2685 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX2685 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 10 page Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer 6 _______________________________________________________________________________________ Pin Description NAME FUNCTION 1, 3, 8, 11, 12, 14 GND Ground. Connect to ground plane with a low-inductance connection. 2 LNAIN RF Input to LNA and LNA Bypass Switch. Requires an external matching network and a series DC-blocking capacitor. PIN 4 GAIN Gain Control Logic-Level Input. Drive high to enable the LNA, open the LNA bypass switch, and increase the receiver’s gain. Drive low to disable the LNA, close the LNA bypass switch, and reduce the receiver’s gain. 5, 15 VCC Supply Voltage. Bypass VCC to GND at each pin with a 47pF capacitor as close to the pin as possible. 6 SHDN Shutdown Control Logic-Level Input. Drive high or connect to VCC for normal operation. Drive low to place the device in low-power shutdown mode. 7 LO Local-Oscillator Input to Downconverter Mixer. Requires a series DC-blocking capacitor and an imped- ance-setting resistor (typically 75 Ω to ground). 9 IFOUT- Inverting Side to Downconverter Mixer’s Differential Open-Collector IF Output. Requires a pull-up induc- tor to VCC for proper biasing, as well as a matching network to ensure optimum output power. 10 IFOUT+ Noninverting Side of Downconverter Mixer’s Differential Open-Collector IF Output. Requires a pull-up inductor to VCC for proper biasing, as well as a matching network to ensure optimum output power. 13 MIXIN RF Input to Downconverter Mixer. Requires an external matching network and series DC-blocking capacitor. 16 LNAOUT LNA Output. Internally matched to 50 Ω. LNAOUT has an internal blocking capacitor. LNA INPUT 880MHz MAX2685 6pF 6pF 3.3pF 300pF 300pF LNA OUTPUT MIXER INPUT 880MHz 47pF 12pF IF OUTPUT 80MHz 1 2 3 4 5 0.1 µF 12nH 6 7 330pF 75 Ω 8 12 13 14 15 16 11 10 9 GND LNAOUT MIXIN GND *OPTIONAL FOR BROADBAND MATCH. R* IFOUT- IFOUT+ 680nH 820nH LO LNAIN VCC VCC VCC VCC 47pF GAIN VCC SHDN GND GND GND GND GAIN- CONTROL INPUT SHUTDOWN INPUT 1000pF LO INPUT 960MHz Figure 1. Typical Operating Circuit |
Similar Part No. - MAX2685_00 |
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Similar Description - MAX2685_00 |
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