max2685eeet Maxim Integrated Products, Inc., max2685eeet Datasheet

max2685eeet

Manufacturer Part Number

max2685eeet

Description

Max2685 Low-cost, 900mhz, Low-noise Amplifier And Downconverter Mixer

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX2685EEET.pdf (10 pages)

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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.

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.

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.

19-1493; Rev 1; 12/00

Cellular/Cordless Phones

Wireless Data

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.

TOP VIEW

LNAIN

SHDN

GAIN

GND

________________________________________________________________ Maxim Integrated Products

Low-Cost, 900MHz, Low-Noise Amplifier

General Description

MAX2685

QSOP

900MHz ISM-Band Radios

868MHz European ISM Band

Pin Configuration

Applications

LNAOUT

GND

MIXIN

GND

IFOUT+

IFOUT-

and Downconverter Mixer

o 800MHz to 1000MHz RF Frequency Range

o +2.7V to +5.5V Single-Supply Operation

o Integrated LNA + Mixer + LO Buffer

o Logic-Controlled LNA Bypass Switch Reduces

o LNA Performance (High/Low Gain)

o Mixer Performance (High/Low Gain)

o Supply Current

o <0.1µA Supply Current in Shutdown Mode

o 0.8µs Receiver Enable Time

MAX2685EEE

Supply Current

Gain: +15dB/-12dB

NF: 1.4dB/12dB

Input IP3: -4dBm/+16dBm

Gain: 6dB/4.6dB

NF: 13dB/12dB

Input IP3: +7dBm/-1.5dBm

8.5mA (High Gain)

3.8mA (Low Gain)

LNAIN

SHDN

PART

GAIN

GND

MANAGEMENT

POWER

TEMP. RANGE

-40°C to +85°C

MAX2685

Ordering Information

LNA

Functional Diagram

LNAOUT MIXIN

LNA BYPASS

BUFFER

MIXER

16 QSOP

PIN-PACKAGE

Features

IFOUT+

IFOUT-

Related parts for max2685eeet

max2685eeet Summary of contents

Page 1

Rev 1; 12/00 Low-Cost, 900MHz, Low-Noise Amplifier General Description The MAX2685’s low-noise amplifier (LNA) and down- converter mixer comprise the major blocks front-end receiver. Optimized for 900MHz operation, the device’s low noise figure, high gain, and ...

Page 2

Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V CC LNAIN Input Power (50Ω source)...................................+10dBm LO Input Power (50Ω source) ........................................+10dBm MIXIN Input Power (50Ω source) ...................................+10dBm IFOUT+, IFOUT- to GND ..........................................-0.3V to ...

Page 3

Low-Cost, 900MHz, Low-Noise Amplifier AC ELECTRICAL CHARACTERISTICS (continued) (MAX2685 EV kit +3V, f SHDN CC differential IFOUT operation 50Ω PARAMETER Mixer Conversion Gain Variation over Temperature Mixer Noise Figure (SSB) Mixer Input ...

Page 4

Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer (MAX2685 EV kit +3V, f SHDN CC LNAIN differential IFOUT operation 50Ω LNA INPUT IP3 vs. SUPPLY VOLTAGE +25°C GAIN = LOW ...

Page 5

Low-Cost, 900MHz, Low-Noise Amplifier (MAX2685 EV kit +3V, f SHDN CC differential IFOUT operation 50Ω MIXER GAIN vs. IF FREQUENCY 8 6 GAIN = HIGH GAIN = LOW ...

Page 6

Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer PIN NAME GND Ground. Connect to ground plane with a low-inductance connection. 11, 12 Input to LNA and LNA Bypass Switch. Requires an external matching network and a ...

Page 7

Low-Cost, 900MHz, Low-Noise Amplifier Detailed Description The MAX2685 consists of five major components: a low-noise amplifier (LNA), an LNA bypass switch, a downconverter mixer, a local-oscillator (LO) buffer, and a power-management block. Low-Noise Amplifier (LNA) The LNA is a wideband, ...

Page 8

Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer Table 2. Mixer Typical S-Parameters (V RF FREQUENCY S11 (MHz) MAG High-Gain Mode (GAIN = 800 0.355 840 0.352 880 0.351 920 0.349 960 0.352 1000 0.353 Low-Gain Mode (GAIN ...

Page 9

Low-Cost, 900MHz, Low-Noise Amplifier Local-Oscillator Input The LO port is the high-impedance input of the local- oscillator buffer. It requires a series DC-blocking capacitor and a shunt resistor to ground to set the input impedance. See the Typical Operating Characteristics ...

Page 10

Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and ...

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