MAX2769EVKIT+【PDF 22/23 页】KIT EVAL FOR MAX2769

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MAX2769

Universal GPS Receiver

Applications Information

The LNA and mixer inputs require careful consideration

in matching to 50 Ω lines. Proper supply bypassing,

grounding, and layout are required for reliable perfor-

mance from any RF circuit.

Low-Power Operation

The MAX2769 can be operated in a low-power mode

by programming the bias current values of individual

blocks to their minimum recommended values. The list

below summarizes the recommended changes to serial

interface registers from their default states to achieve a

low-power operation:

ILNA1 = 0010

ILNA2 = 00

ILO = 00

IMIX = 00

F3OR5 = 1

ANTEN = 0

BITS = 000

IVCO = 0

REFOUTEN = 0

PLLPWRSAV = 1

In this mode, LNA, mixer, LO, and VCO currents are

reduced to their minimum recommended values. The IF

filter is configured as a 3rd-order filter. The output data

is in a 1-bit CMOS mode in the I channel only. PLL is in

an integer-N power-saving mode, which can be used if

the main division ratio is divisible by 32. The antenna

bias circuitry is disabled.

In the low-power mode, the total current consumption

reduces to 10mA, while the total cascaded noise figure

increases to 3.8dB.

Operation in Wideband Galileo and

GLONASS Applications

The use of the wideband receiver options is recom-

mended for Galileo and GLONASS applications. The

frequency synthesizer is used to tune LO to a desired

IF center frequency. Either a fractional-N or an integer-

N mode of the frequency synthesizer can be used

depending on the choice of the reference frequency.

For Galileo reception, set the IF filter bandwidth to

4.2MHz (FBW = 10) and adjust the IF center frequency

through a control word FCEN to the middle of the down-

converted signal band. Alternatively, use wideband set-

tings of 8MHz and 18MHz when the receiver is in a

zero-IF mode.

For GLONASS as well as GPS P-code reception, a

zero-IF receiver configuration is used in which the IF fil-

ter is used in a lowpass filter mode (FCENX = 1) with a

two-sided bandwidth of 18MHz.

It is recommended that an active antenna LNA be used

in wide-bandwidth applications such that the PGA is

operated at lower gain levels for a maximum band-

width. If a PGA gain is programmed directly from a seri-

al interface, GAININ values between 32 and 38 are

recommended. Set the filter pole at the mixer output to

36MHz through MIXPOLE = 1.

Layout Issues

The MAX2769 EV kit can be used as a starting point for

layout. For best performance, take into consideration

grounding and routing of RF, baseband, and power-

supply PCB proper line. Make connections from vias to

the ground plane as short as possible. On the high-

impedance ports, keep traces short to minimize shunt

capacitance. EV kit Gerber files can be requested at

www.maxim-ic.com.

Power-Supply Layout

To minimize coupling between different sections of the

IC, a star power-supply routing configuration with a large

decoupling capacitor at a central V CC node is recom-

mended. The V CC traces branch out from this node, each

going to a separate V CC node in the circuit. Place a

bypass capacitor as close as possible to each supply

pin This arrangement provides local decoupling at each

V CC pin. Use at least one via per bypass capacitor for a

low-inductance ground connection. Do not share the

capacitor ground vias with any other branch.

frequency, which, in turn, determines the choice of the

Package Information

Chip Information

For the latest package outline information and land patterns, go

to www.maxim-ic.com/packages .

PROCESS: SiGe BiCMOS

22

PACKAGE TYPE

28 TQFN-EP

WAFER

PACKAGE CODE

T2855+3

WDICE8

DOCUMENT NO.

21-0140

—

Maxim Integrated

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