9
Marking Specification
Pin 1 Mark
AVAGO
ACPM-7355
PYYWW
AAAAA
Manufacturing Part Number
Lot Number
P Manufacturing info
YY Manufacturing Year
WW Work Week
AAAAA Assembly Lot Number
CoolPAM
Avago Technologies’ CoolPAM is stage-bypass PA tech-
nology which saves more power compared with conven-
tional PA. With this technology, the ACPM-7355 has very
low quiescent current, and efficiencies at low and medium
output power ranges are high.
Incorporation of bias circuit
The ACPM-7355 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-7355 supports three power modes ( bypass
power mode/mid power mode/high power mode) with
two mode control pins (Vmode and Vbp). This control
scheme enables the ACPM-7355 to save power consump-
tion more, which accordingly gives extended talk time.
PDF (probability density function) in the figure 1 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.
Figure 1 . PDF and Current
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 multipli-
cation of current and probability at each output power.
Average current = ³ (PDF x Current)dp
Talk time is extended more as average current consump-
tion is lowered.
