Datasheet > MAX2685

MAX2685

更新时间： 2024-11-24 14:58:07

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
10页	172K
描述
低成本、900MHz、低噪声放大器及下变频混频器

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MAX2685 数据手册

19-1493; Rev 1; 12/00

Low-Cost, 900MHz, Low-Noise Amplifier

and Downconverter Mixer

General Description

Features

The MAX2685’s low-noise amplifier (LNA) and down-

converter mixer comprise the major blocks of an RF

front-end receiver. Optimized for 900MHz operation,

the device’s low noise figure, high gain, and high linear-

ity make it ideal for cellular, cordless, and wireless data

applications. A low supply current of 8.5mA (high-gain

mode) and 3.8mA (low-gain mode) plus a low operating

supply voltage range of +2.7V to +5.5V make it suitable

for use in 3-cell NiCd or 1-cell lithium-ion (Li+) battery

applications. A low-power shutdown mode further

extends battery life by reducing supply current below

0.1µA.

ꢀ 800MHz to 1000MHz RF Frequency Range

ꢀ +2.7V to +5.5V Single-Supply Operation

ꢀ Integrated LNA + Mixer + LO Buffer

ꢀ Logic-Controlled LNA Bypass Switch Reduces

Supply Current

ꢀ LNA Performance (High/Low Gain)

Gain: +15dB/-12dB

NF: 1.4dB/12dB

Input IP3: -4dBm/+16dBm

ꢀ Mixer Performance (High/Low Gain)

Gain: 6dB/4.6dB

The MAX2685 includes an LNA, LNA bypass switch,

downconverter mixer, and local-oscillator (LO) buffer.

The LNA has a low noise figure of 1.4dB, a high gain of

15dB, and an input third-order intercept point (IP3) of

-4dBm. The mixer has a noise figure of 13dB, a gain of

6dB, and an input IP3 of +7dBm. In addition, an LNA

bypass switch allows two levels of gain, reducing

power consumption when high gain is not needed.

NF: 13dB/12dB

Input IP3: +7dBm/-1.5dBm

ꢀ Supply Current

8.5mA (High Gain)

3.8mA (Low Gain)

ꢀ <0.1µA Supply Current in Shutdown Mode

ꢀ 0.8µs Receiver Enable Time

The downconverter mixer has a single-ended RF input

port and differential IF output ports. Differential opera-

tion of the IF ports offers improved even-order harmonic

rejection and increased immunity to noise. An LO buffer

allows the LO port to be driven with only -8dBm of LO

power. The MAX2685 is offered in a space-saving 16-

pin QSOP package.

Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

Applications

MAX2685EEE

-40°C to +85°C

16 QSOP

Cellular/Cordless Phones

Wireless Data

900MHz ISM-Band Radios

868MHz European ISM Band

Functional Diagram

Pin Configuration

LNAOUT MIXIN

TOP VIEW

LNA

MIXER

GND

LNAOUT

IFOUT+

IFOUT-

LNAIN

GAIN

LNAIN

GND

LNA BYPASS

GAIN

MIXIN

GND

MAX2685

GND

SHDN

BUFFER

POWER

MANAGEMENT

IFOUT+

IFOUT-

SHDN

GND

QSOP

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...10

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与MAX2685相关器件

型号	品牌	获取价格	描述	数据表
MAX2685_00	MAXIM	获取价格	Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer
MAX2685_1	MAXIM	获取价格	Evaluation Kit
MAX2685EEE	MAXIM	获取价格	Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer
MAX2685EVKIT	MAXIM	获取价格	Low-Power.Dual.13-Bit Voltage-Output DACs with Serial Interface[MAX5150/MAX5151/MAX5150ACE
MAX2686	MAXIM	获取价格	GPS/GNSS Low-Noise Amplifiers
MAX2686	ADI	获取价格	GPS/GNSS低噪声放大器
MAX2686EWS+T	MAXIM	获取价格	GPS/GNSS Low-Noise Amplifiers
MAX2686L	MAXIM	获取价格	GPS/GNSS Low-Noise Amplifiers with Integrated LDO
MAX2686L	ADI	获取价格	内置LDO的GPS/GNSS低噪声放大器
MAX2686LEWS T	MAXIM	获取价格	GPS/GNSS Low-Noise Amplifiers with Integrated LDO

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