ALT6708 Datasheet, PDF (7/11 Pages) ANADIGICS, Inc – HELP4 UMTS900 (Band 8) WCDMA, LTE Linear PAM

ALT6708
APPLICATION INFORMATION
To ensure proper performance, refer to all related
Application Notes on the ANADIGICS web site:
http://www.anadigics.com
to the VMODE voltages. The Bias Control table below
lists the recommended modes of operation for various
applications.
Shutdown Mode
The power amplifier may be placed in a shutdown mode
by applying logic low levels (see Operating Ranges
table) to the VEN, VMODE1 and VMODE2 voltages.
Bias Modes
The power amplifier may be placed in either Low,
Medium or High Bias modes by applying the
appropriate logic level (see Operating Ranges table)
Three operating modes are recommended to optimize
current consumption. High Bias/High Power operating
mode is for POUT levels > 16 dBm. At ~17dBm - 6.5
dBm, the PA should be “Mode Switched” to Medium
Power Mode. For POUT levels < ~7.5 dBm, the PA
can be switched to Low Power Mode for even lower
quiescent current consumption.
APPLICATION
POUT
LEVELS
Low power
(Low Bias Mode)
Med power
(Medium Bias Mode)
High power
(High Bias Mode)
Shutdown
 +7.5 dBm
> +6.5 dBm
+17 dBm
> +16 dBm
-
Table 6: Bias Control
BIAS
MODE
VEN
VMODE1 VMODE2
vcc
VBATT
Low
+1.8 V +1.8 V +1.8 V 3.1 - 4.35 V > 3.1 V
Low
+1.8 V +1.8 V 0 V 3.1 - 4.35 V > 3.1 V
High
+1.8 V 0 V
Shutdown 0 V
0V
0 V 3.1 - 4.35 V > 3.1 V
0 V 3.1 - 4.35 V > 3.1 V
VBATT
C5
C1 C9
2.2 µF _{0.01 µF 100 pF}
RFIN
VMODE2
VMODE1
VEN
GND at slug
1 _VBATT
2 _RFIN
3 _VMODE2
4 _VMODE1
5 _VEN
VCC ¹⁰
RFOUT ⁹
CPLIN ⁸
GND ⁷
CPLOUT ⁶
VCC
C3
C2
C4
330 pF 0.01 µF ^{2.2 µF ceramic}
CPLIN
RFOUT
CPLOUT
Figure 10: Evaluation Board Schematic
7
Data Sheet - Rev 2.3
03/2012