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ML2751DT Datenblatt(Datasheet) 7 Page - Micro Linear Corporation

Teile-Nr. ML2751DT
Beschreibung  Power Amplifier and LNA
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Hersteller  MICRO-LINEAR [Micro Linear Corporation]
Homepage  http://www.microlinear.com
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 7 page
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ML2751
7
January, 2000
PRELIMINARY
PRELIMINARY DATASHEET
OPERATION MODES AND CONTROL INTERFACE
DESCRIPTION
The signals FEEN and PAON determine the mode of
operation. The three standard modes of operation are
STANDBY, TRANSMIT, and RECEIVE. The control logic is
shown in Table 1.
STANDBY: All circuits are off (LNA bias off), PIN driver
outputs are Tri-stated.
TRANSMIT: PA and the PIN diode drivers are enabled.
The LNA is off (zero current).
RECEIVE: The LNA bias circuits and the PIN diode drivers
are enabled, PA is disabled.
In addition to the two mode control inputs, FEEN and
PAON, there is an analog voltage input that can be used
to set the power output of the amplifier. The voltage range
Table 1. Control Logic
required to set the output power level can be controlled
by an external resistor.
Note that the ML2751 has an internal power amplifier
ramp-on and ramp-off circuit. The power amplifier turn
on/off relative to the ramp is shown in Figure 3. The ramp-
on starts when the PA is enabled, the ramp-off starts when
it is disabled.
Two outputs, PIN and PINB, are provided from the
ML2751 to drive the external PIN diodes in the Transmit/
Receive switch. The timing for these voltage outputs is
shown in Figure 3 relative to the control pins FEEN and
PAON.
Figure 3. Signals vs. Mode Relationships
FEEN
PAON
PIN
PINB
3µs
3µs
PA RF
Envelope
Tri-state
Tri-state
STANDBY
STANDBY
TRANSMIT
RECEIVE
N
E
E
FN
O
A
Pe
d
o
MN
I
PB
N
I
PA
N
LA
P
0X
Y
B
D
N
A
T
Se
t
a
t
s
-
i
r
Te
t
a
t
s
-
i
r
Tf
f
Of
f
O
10
E
V
I
E
C
E
RA
m
0
1
-
/
C
C
VA
m
0
1
+
/
C
C
Vn
Of
f
O
11
T
I
M
S
N
A
R
TA
m
0
1
+
/
C
C
VA
m
0
1
-
/
C
C
Vf
f
On
O
FUNCTIONAL DESCRIPTION




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