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MAX2841EBC-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX2841EBC-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 9 page 5GHz Linear Power Amplifiers 6 _______________________________________________________________________________________ Detailed Description The MAX2840/MAX2841 linear power amplifiers (PAs) are intended for 5GHz to 6GHz band applications. The PAs are fully characterized in the 5.15GHz to 5.35GHz band. The PAs consist of two driver stages and an out- put stage. The ICs also feature an integrated power detector and power shutdown mode. Dynamic Power Control The MAX2840/MAX2841 are designed to provide opti- mum power-added efficiency (PAE) in both high- and low-power applications. For a +3.3V supply at high-out- put power level, the output power is typically +18dBm (MAX2841) with an idle current of 165mA, or +15dBm (MAX2840) with an idle current of 120mA. At low-output power levels, the DC current can be reduced by an external DAC to improve PAE while maintaining suffi- cient ACPR performance. This is achieved by using external resistors connected to the BIAS pin to set the bias currents of the driver and output stages. See the Typical Application Circuit for resistor values. Typically, a DAC voltage of 1.9V gives a 260mA bias current for the MAX2841, a DAC voltage of 1.6V gives a 155mA bias current for the MAX2840. Increasing the DAC volt- age decreases the idle current. Similarly, decreasing the DAC voltage increases the idle current. Users can set the desired idle current using only two off-chip 1% resistors: a shunt resistor (R2) from BIAS to ground and a series resistor (R1) to the DAC voltage, as shown in the Typical Application Circuit. Resistor values R1 and R2 are determined as follows: [Equation 1] VMAX = 1.2 ✕ (R1 + R2) / R2; (ICC = 0, VDAC = VMAX) [Equation 2] IMAX = PART ✕ 1.2 / 2000 + (R1 ✕ R2) / (R1 + R2); (ICC = IMAX = max value, VDAC = 0) [Equation 3] IDAC = (VDAC - 0.82) / R1 [Equation 4] IMID = PART ✕ 1.2 / (2000 + R2); (VDAC = floating) [Equation 5] ICC = PART ✕ IBIAS where: VMAX = maximum DAC voltage IMAX = maximum idle current IMID = idle current with VDAC = floating VDAC = DAC voltage IDAC = DAC current PART = 1000 for MAX2840, 1600 for MAX2841 If no DAC is used and a constant idle current is desired, use Equation 4 to determine the resistor values for a given total bias current. Only R2 is required. For a DAC capable of sourcing and sinking currents, the full voltage range of the DAC (typically from 0 to +3V) can be used. By substituting the desired values of VMAX and IMAX into Equations 1 and 2, R1 and R2 can be easily calculated. For a DAC capable of sourcing current only, use Equation 4 to determine the value of resistor R2 for the desired maximum current. Use Equation 1 to determine the value of resistor R1 for the desired minimum current. Pin Description PIN NAME DESCRIPTION A1 SHDN Shutdown Input. Drive logic low to place the PA in shutdown mode; drive logic high for normal operation. A2, A4, C2, C4 GND Ground. Requires a good connection to the circuit board ground plane with multiple vias for lowest possible inductance and lowest thermal resistance. A3 VCC DC Supply Voltage. Requires external RF bypass capacitor to ground. B2 RF_IN Power Amplifier Input. Requires external DC-blocking capacitor. B4 RF_OUT Power Amplifier Output. Requires external DC-blocking capacitor and pullup inductor. C1 BIAS Bias Control. Connect two external resistors and DAC block to adjust the bias current. C3 P_DET Power Detector Output. This output is a DC voltage indicating the PA output power. |
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