SiGe, High-Linearity, 850MHz to 1550MHz
Up/Downconversion Mixer with LO Buffer
Typical Operating Characteristics (continued)
(Typical Application Circuit, Upconversion mode , V CC = +5.0V, P LO = 0dBm, P IF = 0dBm, f IF = 350MHz, LO is high-side injected,
T C = +25°C, unless otherwise noted.)
0
IF PORT RETURN LOSS vs. IF FREQUENCY
(UPCONVERSION MODE)
0
LO RETURN LOSS vs. LO FREQUENCY
(UPCONVERSION MODE)
10
20
f LO = 1500MHz
f LO = 1200MHz
5
P LO = -3dBm
P LO = 0dBm
10
30
40
50
f LO = 1900MHz
15
20
P LO = +3dBm
50
140
230
320
410
500
1100
1250
1400
1550
1700
1850
2000
IF FREQUENCY (MHz)
LO FREQUENCY (MHz)
Pin Description
PIN
1
2–5, 9, 10, 11,
13, 14
6, 8, 15
7
12
16, 17
18, 19, 20
NAME
RF
GND
V CC
LOBIAS
LO
IF+, IF-
GND
EP
FUNCTION
Single-Ended 50 Ω RF Input. Internally matched and DC shorted to GND through a balun. Requires
an input DC-blocking capacitor.
Ground. Internally connected to the exposed pad. Connect all ground pins and the exposed pad
(EP) together.
Power Supply. Bypass to GND with capacitors as close as possible to the pin (see the Typical
Application Circuit ).
LO Amplifier Bias Control. Output bias resistor for the LO buffer. Connect a 61.9 Ω ±1% resistor
from LOBIAS to V CC to set the bias current for the main LO amplifier.
Local Oscillator Input. This input is internally matched to 50 Ω . Requires an input DC-blocking
capacitor.
Differential IF Output
Ground. Not internally connected. Ground these pins or leave unconnected.
Exposed Pad. Internally connected to GND. Solder this exposed pad to a PCB pad that uses
multiple ground vias to provide heat transfer out of the device into the PCB ground planes. These
multiple ground vias are also required to achieve the noted RF performance.
______________________________________________________________________________________
13
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