ꢁWt6223ꢃ
ꢁPPLICꢁtION INFOꢃMꢁtION
To ensure proper performance, refer to all related
Application Notes on the ANADIGICS web site:
http://www.anadigics.com
appropriate logic level (see Operating Ranges table)
to the VMODE voltage. The Bias Control table lists
the recommended modes of operation for various
applications.
Shutdown Mode
The WCDMA power amplifier may be placed in a
shutdown mode by applying logic low levels (see
Operating Ranges table) to both the VEN and VMODE
voltages.
Two operating modes are recommended to optimize
current consumption. High Bias operating mode is for
POUT levels > 16 dBm. At or below +16 dBm, the PA
should be “Mode Switched” to Low Bias Mode.
Bias Modes
The WCDMApower amplifier may be placed in either a
Low Bias mode or a High Bias mode by applying the
SUPPLY VOLTAGE FROM
DC-DC CONVERTER***
BATTERY
VOLTAGE
4.7uF++
10nF++
22pF**
22
V
BATT
1
2
21
20
19
18
17
16
15
14
13
12
IMT RF INPUT
WCDMA BIAS MODE
WCDMA ENABLE
DCS/PCS RF INPUT
BAND SELECT
WCDMA_IN
V CC_WCDMA
10nF++
22pF**
WCDMA_OUT
V
V
MODE
EN
27pF++
WCDMA RF OUTPUT
DCS/PCS RF OUTPUT
3
GND
27pF++
4
DCS/PCS_PIN
DCS/PCS_OUT
5
BS
GND
27pF++
27pF++
6
ꢁWt6223ꢃ
TX ENABLE
TX_EN
GND
VCC_OUT
GND
7
BATTERY
VOLTAGE
V
C
V
BATT
4.7uF++
10K*
2.7pF**
1nF**
8
EXT
22nF**
27pF*
9
DAC OUTPUT
RAMP
GND
GSM850/900 RF OUTPUT
10
GSM850/900 RF INPUT
GSM850/900_IN
GSM850/900_OUT
V
CC2_GSM
11
*
Filtering may be required to filter noise from baseband.
** This component should be placed as close to the device pin as possible.
*** If the final design uses a DC-DC Converter, otherwise connect Pin 21 directly to VBATT Pin 22.
++ These components are recommended as good design practice for improving noise rejection
characteristics. The values specified are not critical as they may not be required in the final
application.
Figure 4: ꢁpplicaꢄion Circuiꢄ
Data Sheet - Rev 2.0
13
11/2008
ANADIGICS [ ANADIGICS, INC ]
