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 50

Ω 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

For the power supplies, a star topology works well. In a

tor which provides a low impedance at the RF frequen-

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