Datasheet > MAX2681

MAX2681

更新时间： 2023-12-20 18:44:15

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	2151K
描述
400MHz至2.5GHz、低噪声、SiGe下变频混频器

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MAX2681 数据手册

MAX2680/MAX2681/

MAX2682

400MHz to 2.5GHz, Low-Noise,

SiGe Downconverter Mixers

Power-Supply Layout

Table 3. IFOUT Port Impedance

To minimize coupling between different sections of the IC,

the ideal power-supply layout is a star configuration with

FREQUENCY

PART

45MHz

960-j372

934-j373

670-j216

70MHz

803-j785

746-j526

578-j299

240MHz

186-j397

161-j375

175-j296

a large decoupling capacitor at a central V

node. The

MAX2680

MAX2681

MAX2682

traces branch out from this central node, each going

to a separate V

node on the PC board. At the end of

each trace is a bypass capacitor that has low ESR at the

RF frequency of operation. This arrangement provides

local decoupling at the V

pin. At high frequencies, any

signal leaking out of one supply pin sees a relatively high

impedance (formed by the V trace inductance) to the

Table 4. IF Output Impedance-Matching

Components

central V

node, and an even higher impedance to any

other supply pin, as well as a low impedance to ground

through the bypass capacitor.

FREQUENCY

70MHz

330nH

MATCHING

COMPONENT

45MHz

390nH

39pF

240MHz

82nH

3pF

Impedance-Matching Network Layout

The RFIN and IFOUT impedance-matching networks

are very sensitive to layout-related parasitics. To mini-

mize parasitic inductance, keep all traces short and

place components as close as possible to the chip. To

minimize parasitic capacitance, use cutouts in the ground

plane (and any other plane) below the matching network

components. However, avoid cutouts that are larger than

necessary since they act as aperture antennas.

15pF

250Ω

Open

Typical Operating Circuit

SHUTDOWN

CONTROL

SHDN

INPUT

MAX2680

MAX2681

MAX2682

GND

+2.7V TO +5.5V

10µF

1000pF

OUTPUT

RFIN

IFOUT

INPUT

THE VALUES OF MATCHING COMPONENTS C2, L1, R1, Z1, Z2, AND Z3 DEPEND ON THE IF AND RF FREQUENCY AND DOWNCONVERTER. SEE TABLES 2 AND 4.

Maxim Integrated

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www.maximintegrated.com

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