ALT6725
APPLICATION INFORMATION
To ensure proper performance, refer to all related
Application Notes on the ANADIGICS web site: http://
www.anadigics.com along with Figure 3, which shows
the recommended ON/OFF timing sequence for RF
IN
,
control voltages, and supply voltages.
Shutdown Mode
The power amplifier may be placed in a shutdown
Vcontrols
Venable/Vmode(s)
Rise/Fall Max 1
µ
S
Defined at 10% to 90%
of Min/Max Voltage
Off Sequence Start
T_0FF = 0µ
mode by applying logic low levels (see Operating
Ranges table) to the V
ENABLE
and V
MODE
pads.
Bias Modes
The power amplifier may be placed in Low, Medium,
or High Bias modes by applying the appropriate logic
level (see Operating Ranges table) to the V
MODE
pin.
The Bias Control table lists the recommended modes
of operation for various applications.
On Sequence Start
T_0N = 0µ
ON Sequence
OFF Sequence
RF
IN_CELL, PCS
notes 1,2
V
EN_CELL, PCS
V
CC/
V
CC
A
note 1
T_0N+1µS
T_0N+3µS
T_0FF+2µS T_0FF+3µS
Referenced After 90% of Rise
Time
Notes:
(1) Level might be changed after RF is ON.
(2) RF OFF defined as P
IN
≤ -30 dBm.
(3) Switching simultaneously between V
MODE
and V
EN
is not recommended.
Figure 3: Recommended ON/OFF Timing Sequence
Referenced Before10% of Fall
Time
Table 8: Bias Control
APPLICATION
Low Bias Mode
Medium Bias Mode
High Bias Mode
Shutdown
P
OUT
LEVELS
< +9 dBm
> +9 dBm
< +15 dBm
> +15 dBm
-
BIAS
MODE
Low
Medium
High
Shutdown
V
EN_CELL
V
EN_PCS
+1.8 V
+1.8 V
+1.8 V
0V
V
MODE1
+1.8
+1.8 V
0V
0V
V
MODE2
+1.8 V
0V
0V
0V
V
CC
0.8 - 4.35 V
0.8 - 4.35 V
1.3 - 4.35 V
3.2 - 4.35 V
V
BATT
> 3.2 V
> 3.2 V
> 3.2 V
> 3.2 V
8
PRELIMINARY DATA SHEET - Rev 1.0
07/2012
ANADIGICS [ ANADIGICS, INC ]
