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ACPM-7371 Datasheet(PDF) 8 Page - AVAGO TECHNOLOGIES LIMITED |
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ACPM-7371 Datasheet(HTML) 8 Page - AVAGO TECHNOLOGIES LIMITED |
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8 / 15 page  8 CoolPAM Avago Technologies’CoolPAM is stage-bypass PA technol- ogy which saves more power compared with convention- al PA. With this technology, the ACPM-7371 has very low quiescent current and efficiencies at low and medium output power ranges are very high. Incorporation of bias circuit The ACPM-7371 has internal bias circuit, which removes the need for external constant voltage source (LDO). PA on/off is controlled by Ven. This is digitally control pin. 3-mode power control with two mode control pins The ACPM-7371 supports three power modes (low power mode/mid power mode/high power mode) with two mode control pins (Vmode0 and Vmode1). This control scheme enables the ACPM-7371 to save more power, which accordingly gives extended talk time. PDF (probability density function) in below figure showing distribution of output power of mobile in real field gives motivation for stage-bypass PA. Output power is less than 16dBm for most of operating time (during talking), so it is important to save power consumption at low and medium output power ranges. Average current & Talk time Average current consumed by PA can be calculated by summing up current at each output power weighted with probability. So it is expressed with integration of multiplication of current and probability at each output power. Talk time is extended more as average current consump- tion is lowered. Mode control pins Vmode0 and Vmode1 are digitally controlled pins and they control operating mode of PA and truth table is summarized in Table 3. These pins do not require constant voltage for interface, and 1.9V is recommend at Vmode0 and Vmode1 pins. Application on mobile board Below figure shows one application example on mobile. C4 and C5 should be placed nearby pin1 and pin10. Transmission line length after PA output should be minimized to reduce conduction loss. When output voltage of mode control pins at base-band chipset is 2.6V, series resistor of 2Kohm is recommended for Vmode0 and 4.7kohm for Vmode1. Figure 10. PDF and Current C7 C8 BB C3 L1 output matching circuit ACPM -7371 PA_R1 PA_R0 PA_ON C2 TX lter RF In Coupler RF Out C1 C9 C6 V BATT C4 C5 R2 4.7k R1 2k Ven Vmode0 Vmode1 IN Vcc1 Vcc2 GND GND GND OUT Figure 11. ACPM-7371 Application Example |
Similar Part No. - ACPM-7371 |
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Similar Description - ACPM-7371 |
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