Datasheet
MAX2410
Low-Cost RF Up/Downconverter
with LNA and PA Driver
______________________________________________________________________________________ 11
Standby Mode
When the TXEN and RXEN pins are both set to logic 1,
all functions are disabled and the supply current drops
to 160µA (typical). This mode is called standby, and it
corresponds to a standby mode on the compatible IF
transceiver chips MAX2510 and MAX2511.
Applications Information
Extended Frequency Range
The MAX2410 has been characterized at 1.9GHz for use
in PCS-band applications; however, it operates over a
much wider frequency range. The LNA gain and noise
figure, as well as mixer conversion gain, are plotted over
a wide frequency range in the
Typical Operating
Characteristics
. When operating the device at RF fre-
quencies other than those specified in the
AC Electrical
Characteristics
table, it may be necessary to design or
alter the matching networks on the RF ports. If the IF
frequency is different than that specified in the
AC
Electrical Characteristics
table, the IFIN and IFOUT
matching networks must be altered. The
Typical
Operating Characteristics
provide Port Impedance Data
vs. Frequency on all RF and IF pins for use in designing
matching networks. The LO port (LO and LO) is internally
terminated with 50Ω resistors and provides a VSWR of
approximately 1.2:1 to 2GHz and 2:1 up to 3GHz.
Layout Issues
A properly designed PC board is an essential part of
any RF/microwave circuit. Be sure to use controlled
impedance lines on all high-frequency inputs and out-
puts. Use low-inductance connections to ground on all
GND pins, and place decoupling capacitors close to all
V
CC
connections.
For the power supplies, a star topology works well. In a
star topology, each V
CC
node in the circuit has its own
path to the central V
CC
, and its own decoupling capaci-
tor which provides a low impedance at the RF frequen-
cy of interest. The central V
CC
node has a large
decoupling capacitor as well, to provide good isolation
between the different sections of the MAX2410. The
MAX2410 EV kit layout can be used as a guide to inte-
grating the MAX2410 into your design.
_________________________________________Typical Application Block Diagram
MAX2410
LNAIN
ANTENNA
T/R
GC
TX MIXER
CBLOCK
RX MIXER
RXEN
RF
BPF
RF
BPF
TXEN
PADROUT
RECEIVE
IFOUT
LOCAL
OSCILLATOR
LNA
PA DRIVER
TRANSMIT
IFIN
IFOUT
IFIN
LO
LO
POWER
MANAGEMENT
MATCH MATCH
RF
BPF
IF
BPF
MATCH
IF
BPF
MATCH
RF
BPF
MATCH