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MAX2645 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX2645 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page 3.4GHz to 3.8GHz SiGe Low-Noise Amplifier/PA Predriver 8 _______________________________________________________________________________________ Typical Operating Characteristics (continued) (MAX2645 EV kit, VCC = +3.3V, RBIAS = 20k Ω, fRFIN = 3550MHz, TA = +25°C, unless otherwise noted.) 7 9 8 11 10 12 13 3.0 4.0 3.5 4.5 5.0 5.5 OUTPUT P1dB POINT vs. SUPPLY VOLTAGE (HIGH-GAIN MODE) SUPPLY VOLTAGE (V) TA = +25 °C TA = +85 °C TA = -40 °C PA PREDRIVER CIRCUIT VCC = 5V -25 -15 -20 -5 -10 5 0 10 -10.0 -5.0 0 5.0 OUTPUT POWER vs. INPUT POWER (LOW-GAIN MODE) INPUT POWER (dBm) TA = +25°C TA = +85°C TA = -40°C PA PREDRIVER CIRCUIT VCC = 5V 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 3.4 3.5 3.6 3.7 3.8 INPUT VSWR vs. FREQUENCY FREQUENCY (GHz) HIGH GAIN LOW GAIN PA PREDRIVER CIRCUIT VCC = 5V Pin Description PIN NAME FUNCTION 1, 2, 4, 7, EP GND Ground. Connect to ground plane with a low-inductance connection. Solder exposed paddle evenly to the board ground plane. 3 RFIN RF Input Port to Amplifier. Requires a matching network and a DC-blocking capacitor that may be part of this network. See Figure 1 for recommended component values. 5 BIAS Bias-Setting Resistor Connection. A resistor, RBIAS, placed from BIAS to ground sets the linearity and supply current of the amplifier. 6 RFOUT RF Open-Collector Output Port of Amplifier. Requires a matching network composed of an inductance to VCC and a DC-blocking capacitor. See Figure 1 for recommended component values. 8 SHDN Shutdown Control Logic-Level Input. A logic high enables the device for normal operation. A logic low places the device in low-power shutdown mode. 9 GAIN Gain Control Logic-Level Input. A logic high places the device in high-gain mode. A logic low places the device in low-gain mode, reducing the gain by 25dB. 10 VCC Power Supply Input. Bypass directly to ground with a capacitor as close to the supply pin as possible. See Figure 1 for recommended component values. |
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