AWT6274 Datasheet, PDF (5/8 Pages) ANADIGICS, Inc – HELP PCS/WCDMA 3.4V/29dBm Linear Power Amplifier Module

APPLICATION INFORMATION
AWT6274
To ensure proper performance, refer to all related
Application Notes on the ANADIGICS web site:
http://www.anadigics.com
Shutdown Mode
The power amplifier may be placed in a shutdown
mode by applying logic low levels (see Operating
Ranges table) to both the VREF and VMODE voltages.
Bias Modes
The power amplifier may be placed in either a Low
Bias mode or a High Bias mode by applying the
appropriate logic level (see Operating Ranges table)
to the VMODE voltage. The Bias Control table lists the
recommended modes of operation for various
applications.
Three operating modes are recommended to
optimize current consumption. High Bias operating
mode is for POUT levels > 16 dBm. At POUT <16dBm,
the PA should be “Mode Switched” to Low Bias Mode.
For POUT levels < ~7 dBm, the VCC can be switched
to 1.5 V (Low Bias Mode is also used for this POUT
range).
APPLICATION
CDMA - low power
CDMA - med power
CDMA - high power
Shutdown
Table 5: Bias Control
POUT
LEVELS
BIAS
MODE
VREF
VMODE
VCC
<+7 dBm
Low +2.85 V +2.85 V > +1.5 V
< +16 dBm
Low +2.85 V +2.85 V +3.2 - 4.2 V
>+16 dBm
High +2.85 V 0 V +3.2 - 4.2 V
-
Shutdown 0 V
0 V +3.2 - 4.2 V
VCC1
RF IN
VMODE
VREF
C1
0.01µF
1 _VCC
2 _RFIN
3 _GND
4 _VMODE
5 _VREF
C2
0.01µF
VCC ¹⁰
GND ⁹
RFOUT ⁸
GND ⁷
GND ⁶
GND
at slug
C3
0.01µF
VCC2
C4
2.2µF ceramic
RF OUT
Figure 3: Application Circuit Schematic
PRELIMINARY DATA SHEET - Rev 1.8
5
10/2005