RF2318 RF Micro Devices, RF2318 Datasheet - Page 4

• Manufacturer Part Number: RF2318
• Description: LINEAR BROADBAND AMPLIFIER
• Manufacturer: RF Micro Devices

3
3-24
Pin
RF2318
1
2
3
4
5
6
7
8
Function
RF OUT
RF IN
GND
GND
GND
GND
GND
GND
RF IN
Note 1:
Optional resistor Rs can be used to maintain the correct bias level at higher supply voltages. This
is useful to increase output capability or linearity for signals with high crest factors.
Description
RF input pin. This pin is NOT internally DC blocked. A DC blocking
capacitor, suitable for the frequency of operation, should be used in all
applications. The device has internal feedback, and not using a DC
blocking capacitor will disable the temperature compensation.The bias
of the device can be controlled by this pin. Adding an optional 1k
resistor to ground on this pin reduces the bias level, which may be com-
pensated for by a higher supply voltage to maintain the appropriate
bias level. The net effect of this is an increased output power capability,
as well as higher linearity for signals with high crest factors. DC cou-
pling of the input is not allowed, because this will override the internal
feedback loop and cause temperature instability.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance. Each ground pin should
have a via to the ground plane.
Same as pin 2.
Same as pin 2.
Same as pin 2.
Same as pin 2.
Same as pin 2.
RF output and bias pin. Because DC is present on this pin, a DC block-
ing capacitor, suitable for the frequency of operation, should be used in
most applications. For biasing, an RF choke in series with a resistor is
needed. The value for the resistor R
82
rent of 63mA. In lower power applications the value of R
increased to lower the current and V
Optional:
R
Note 1
S
=1 - 2 k
for V
220 pF
CC
=12V. The DC voltage on this pin is typically 7V with a cur-
Application Schematic
1
2
3
4
C
D
is 30
on this pin.
(0.5W) for V
8
7
6
5
V
CC
C
= 9 - 12 V
CC
can be
R
=9V and
3.3 H
C
= 30 - 82
220 pF
Interface Schematic
RF IN
Preliminary
RF OUT
Rev A2 010228
RF OUT