Datasheet

MAX2051
SiGe, High-Linearity, 850MHz to 1550MHz
Up/Downconversion Mixer with LO Buffer
______________________________________________________________________________________ 13
Pin Description
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.)
PIN NAME FUNCTION
1RF
Single-Ended 50Ω RF Input. Internally matched and DC shorted to GND through a balun. Requires
an input DC-blocking capacitor.
2–5, 9, 10, 11,
13, 14
GND
Ground. Internally connected to the exposed pad. Connect all ground pins and the exposed pad
(EP) together.
6, 8, 15 V
CC
Power Supply. Bypass to GND with capacitors as close as possible to the pin (see the Typical
Application Circuit).
7 LOBIAS
LO Amplifier Bias Control. Output bias resistor for the LO buffer. Connect a 61.9Ω ±1% resistor
from LOBIAS to V
CC
to set the bias current for the main LO amplifier.
12 LO
Local Oscillator Input. This input is internally matched to 50Ω. Requires an input DC-blocking
capacitor.
16, 17 IF+, IF- Differential IF Output
18, 19, 20 GND Ground. Not internally connected. Ground these pins or leave unconnected.
—EP
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.
MAX2051 toc62
50
20
30
40
10
0
32023014050 410 500
IF PORT RETURN LOSS vs. IF FREQUENCY
(UPCONVERSION MODE)
IF FREQUENCY (MHz)
IF PORT RETURN LOSS (dB)
f
LO
= 1200MHz
f
LO
= 1500MHz
f
LO
= 1900MHz
MAX2051 toc63
1850170015501400
10
15
5
0
20
1100 1250 2000
LO RETURN LOSS vs. LO FREQUENCY
(UPCONVERSION MODE)
LO FREQUENCY (MHz)
LO RETURN LOSS (dB)
P
LO
= +3dBm
P
LO
= 0dBm
P
LO
= -3dBm