PRELIMINARY
PIN CONFIGURATION
ML2751
20-Pin TSSOP (T20)
PAON
FEEN
TRFI
GND
RRFO
GND
GND
GND
TPS
TPA
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND
GND
TRFO
GND
GND
VCC
GND
PINB
PIN
RLNI
ML2751
TOP VIEW
PIN DESCRIPTIONS
Pin #
LNA Section
5
RRFO
O (analog)
Receive RF Output. LNA RF Output. This is an open collector output
that requires an external load to VCC. This pin requires matching for
optimum gain
Receive LNA RF input. This pin is directly connected to the base of an
NPN transistor. The input to this pin should be AC coupled using an
external capacitor. This input will require matching for optimum
performance
Transmit RF Power Amplifier (PA) input. Requires RF choke to VCC that
can handle up to 150mA. The VCC end of the choke requires both RF
and low frequency decoupling to ground to minimize supply
modulation
This pin is the non-inverting input of an op amp. The voltage on this pin
sets the RF power produced by the PA, permitting variable power
operation under control of the baseband circuits (see Figure 2)
This pin is the inverting input of an operational amplifier. A resistor
from this pin to GND scales the TPS input voltage control range to
match that of the external baseband control circuits. If scaling of the
TPS input range is not required the TPA pin can either be grounded or
left floating (see Figure 2)
Transmit RF Power Amplifier output. Open collector output. Requires
RF choke to VCC that can handle up to 150mA. The VCC end of the
choke requires both RF and low frequency decoupling to ground to
minimize supply modulation
Signal Name
I/O Type
Description
11
RLNI
I (analog)
PA Section
3
TRFI
I (analog)
9
TPS
I (analog)
10
TPA
I (analog)
18
TRFO
O (analog)
4
PRELIMINARY DATASHEET
January, 2000
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
