MAX2406 查看數據表（PDF） - Maxim Integrated
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MAX2406 Datasheet PDF : 8 Pages
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Low-Cost Downconverter
with Low-Noise Amplifier
LO Inputs
The LO and LO pins are internally terminated with 50Ω
resistors. See the Typical Operating Characteristics for
a plot of LO Port Return Loss vs. Frequency. AC couple
the local-oscillator signal to these pins. If a single-
ended LO source is used, connect LO to ground.
IF Output Port
The receive mixer output appears on the differential IF
and IF pins. These open-collector outputs each require
an external inductor to VCC for DC biasing. This port
typically requires a matching network for coupling to an
external IF filter. For single-ended operation, connect
the unused side (typically IF) to VCC, and decouple it to
ground with a 1000pF capacitor. Figure 1 shows exam-
ples of single-ended and differential IF port connec-
tions. Refer to the IF and IF Output Impedance vs.
Frequency plot in the Typical Operating Characteris-
tics. At lower IF frequencies, a shunt resistor across the
pull-up inductor (in single-ended applications) or
across IF and IF (in differential applications) can be
used to set the IF impedance.
Power-Down Control
Pulling RXEN low places the MAX2406 in shutdown
mode. Power-down is guaranteed with a control voltage
at or below 0.6V. The device exits shutdown in 0.5µs
typical.
__________Applications Information
Extended Frequency Range
The MAX2406 has been characterized at 1.9GHz for
use in PCS applications; however, it operates over a
much wider frequency range. The LNA gain and noise
figure, as well as receive mixer conversion gain, are
plotted over a wide frequency range in the Typical
Operating Characteristics. When operating the device
at frequencies other than those specified in the specifi-
cation table, it may be necessary to design or alter the
matching networks on LNAIN, RXMIXIN, IF, and (if
used) IF. In some cases, the internal broadband output
match on LNAOUT may have to be supplemented by
an external matching circuit. The Typical Operating
Characteristics provide port-impedance data vs. fre-
quency for use in designing a matching network. The
VCC
VCC
LO INPUT
DIFFERENTIAL
220pF
7 LO
8 LO
220pF
DIFFERENTIAL LO OPERATION
RECEIVE
MIXER
INPUT
*OPTIONAL
47pF
47pF
LNA INPUT
220pF
*1pF
RECEIVER
ENABLE
LO INPUT
(SINGLE-ENDED)
220pF
220pF
4.7nH
1pF
5
VCC
2 LNAIN
9
VCC
220pF
LNAOUT 19
VCC
LNA OUTPUT
MAX2406
6 RXEN
7 LO
8 LO
16 RXMXIN
GND
1000pF
R*
LCHOKE
IF 13
VCC
IF 14
1000pF
MATCH
14
IF
1000pF
1, 3, 4, 10,
11, 12, 15,
17, 18, 20
LCHOKE
R*
LCHOKE
IF OUTPUT
(SINGLE-ENDED)
1000pF
VCC
1000pF
IF OUTPUT
DIFFERENTIAL
1000pF
IF
13
DIFFERENTIAL IF OPERATION
Figure 1. MAX2406 Typical Operating Circuit
6 _______________________________________________________________________________________
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