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DATA SHEET ? SKY65338-21 TRANSMIT/RECEIVE FRONT-END MODULE
12
11
10
TX_IN
GND
RX_OUT
1
2
3
4
5
6
9
8
7
V1
V2
ANT
S1347
Figure 2. SKY65338-21 Pinout – 12-Pin MCM
(Top View)
Table 1. SKY65338-21 Signal Descriptions
Pin #
1
2
3
4
5
Name
TX_IN
GND
RX_OUT
VC_BIAS
VREF1
Description
Transmit RF input
Ground
Receive RF output
+3.6 V DC supply
+3.6 V DC supply
Pin #
7
8
9
10
11
ANT
V2
V1
VCC2
PA_EN
Name
Description
Antenna
Switch logic (see Table 1)
Switch logic (see Table 1)
+3.6 V DC supply
PA enable switch
(On = 2.5-3.6 V; Off = 0-0.2 V)
6
VREF2
+3.6 V DC supply
12
VCC1
+3.6 V DC supply
Technical Description
The SKY65338-21 provides input and output amplifier stages, and
is internally matched for optimum efficiency. An active bias circuit
provides the input and output stages with excellent gain tracking
over temperature and voltage variations. The module operates
with positive DC voltages, and maintains high efficiency and good
linearity. The nominal operating voltage is 3.6 V for maximum
power, but the device can be operated at slightly lower voltages
for other mobile applications.
The SKY65338-21 is internally matched for optimum linearity and
efficiency. The input and output stages are independently
supplied using the VCC1 and VCC2 supply lines (pins 12 and 10,
respectively). The bias reference voltages for stages 1 and 2 are
supplied using common lines VREF1 and VREF2 (pins 5 and 6,
respectively). The DC control voltage that sets the bias for
Operational Modes
The module’s receive and transmit modes are configured using
the V1 and V2 control signals (pins 9 and 8, respectively). The
transmit path provides an harmonic filter and high efficiency PA.
The receive path provides a low loss <1 dB bypass between the
antenna port and the receive port.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY65338-21 are provided
in Table 2. The recommended operating conditions are specified
in Table 3 and electrical specifications are provided in Table 4.
Typical performance characteristics of the SKY65338-21 are
illustrated in Figures 3 through 10. The state of the SKY65338-21
is determiend by the logic provided in Table 5.
stages 1 and 2 is supplied by the VC_BIAS signal, pin 4.
Skyworks Solutions, Inc. ? Phone [781] 376-3000 ? Fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com
2
October 13, 2009 ? Skyworks Proprietary Information ? Products and Product Information are Subject to Change Without Notice ? 201004C
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