as1339 austriamicrosystems, as1339 Datasheet - Page 2

• Manufacturer Part Number: as1339
• Description: 650ma Rf Step-down Dc-dc For Pa, With Two Ldos
• Manufacturer: austriamicrosystems

AS1339
Datasheet - P i n o u t
4 Pinout
Figure 2. Pin Assignments (Top View)
Pin Description
Table 1. Pin Description
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Pin Name
PA_EN
REFIN
AGND
PGND
LDO2
EN2
NC
LX
Pin Number
A1
A2
A3
A4
B1
B2
B3
B4
LDO2
LDO1
Not Connected. Free, high impedance for normal operation. Used for
internal test purpose.
Low-Noise Analog Ground
DAC-Controlled Input. Reference voltage for buck converter. The output of
the PA step-down converter is regulated to 2.5 x V
enabled when V
Power Ground for PA Step-Down Converter
10mA LDO Regulator 2 Output. Connect LDO2 with a 0.1μF ceramic
capacitor as close as possible to LDO2 and AGND. LDO2 is internally pulled
down through a 100Ω resistor when this regulator is disabled.
PA Step-Down Converter Enable Input. For normal operation, connect to
logic-high. For shutdown mode, connect to logic-low. The pin is internally
pulled down through a 110kΩ resistor.
Enable Input for LDO2. For normal operation, connect to logic-high. For
shutdown mode, connect to logic-low. The pin is internally pulled down
through a 110kΩ resistor.
Inductor Connection. Connect an inductor from LX to the output of the PA
step-down converter.
IN2
NC
A1
B1
C1
D1
PA_EN
AGND
TEST
EN1
A2
B2
C2
D2
Revision 1.02
IN
≤ 2.69V x V
REFIN
IN1B
EN2
PAB
C3
D3
A3
B3
PGND
REFIN
IN1A
PAA
C4
D4
A4
LX
B4
Description
.
REFIN
. Bypass mode is
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