NBB-312
Pin
1
Function
GND
Description
Interface Schematic
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
Same as pin 1.
Same as pin 1.
2
3
4
GND
GND
RF IN
RF input pin. This pin is NOT internally DC blocked. A DC blocking capacitor,
suitable for the frequency of operation, should be used in most applica-
tions. DC coupling of the input is not allowed, because this will override the
internal feedback loop and cause temperature instability.
Same as pin 1.
5
6
7
8
GND
GND
GND
Same as pin 1.
Same as pin 1.
RF output and bias pin. Biasing is accomplished with an external series
resistor and choke inductor to V . The resistor is selected to set the DC
RF OUT
CC
RF OUT
current into this pin to a desired level. The resistor value is determined by
the following equation:
(VCC – VDEVICE
)
R = -------------------------------------------
ICC
RF IN
Care should also be taken in the resistor selection to ensure that the cur-
rent into the part never exceeds maximum datasheet operating current
over the planned operating temperature. This means that a resistor
between the supply and this pin is always required, even if a supply near
8.0V is available, to provide DC feedback to prevent thermal runaway.
Alternatively, a constant current supply circuit may be implemented.
Because DC is present on this pin, a DC blocking capacitor, suitable for the
frequency of operation, should be used in most applications. The supply
side of the bias network should also be well bypassed.
Same as pin 1.
9
GND
Package Drawing
2.94 min
3.28 max
0.025 min
0.125 max
0.50 nom
0.50 nom
1.00 min
1.50 max
Pin 1
Indicator
Pin 1
Indicator
RF OUT
Ground
RF IN
N6
Ground
Lid ID
1.70 min
1.91 max
0.98 min
1.02 max
0.38 nom
2.39 min
2.59 max
0.37 min
0.63 max
All Dimensions in Millimeters
Notes:
1. Solder pads are coplanar to within ±0.025 mm.
2. Lid will be centered relative to frontside metallization with a tolerance of ±0.13 mm.
3. Mark to include two characters and dot to reference pin 1.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A5 DS060124
3 of 8
RFMD [ RF MICRO DEVICES ]
