Rainbow-electronics MAX19985A Instrukcja Użytkownika Pobierz pdf

General Description

The MAX19985A high-linearity, dual-channel, downcon-

version mixer is designed to provide approximately

8.7dB gain, +25.5dBm of IIP3, and 9.0dB of noise fig-

ure for 700MHz to 1000MHz diversity receiver applica-

tions. With an optimized LO frequency range of

900MHz to 1300MHz, this mixer is ideal for high-side

LO injection architectures in the cellular and new

700MHz bands. Low-side LO injection is supported by

the MAX19985, which is pin-pin and functionally com-

patible with the MAX19985A.

In addition to offering excellent linearity and noise per-

formance, the MAX19985A also yields a high level

of component integration. This device includes two

double-balanced passive mixer cores, two LO buffers,

a dual-input LO selectable switch, and a pair of differ-

ential IF output amplifiers. On-chip baluns are also inte-

grated to allow for single-ended RF and LO inputs.

The MAX19985A requires a nominal LO drive of 0dBm

and a typical supply current of 330mA at V

= +5.0V

or 280mA at V

= +3.3V.

The MAX19985/MAX19985A are pin compatible with

the MAX19995/MAX19995A series of 1700MHz to

2200MHz mixers and pin similar with the MAX19997A/

MAX19999 series of 1850MHz to 3800MHz mixers,

making this entire family of downconverters ideal for

applications where a common PCB layout is used

across multiple frequency bands.

The MAX19985A is available in a 6mm x 6mm, 36-pin

thin QFN package with an exposed pad. Electrical per-

formance is guaranteed over the extended temperature

range of T

= -40°C to +85°C.

Applications

850MHz WCDMA and cdma2000

Base Stations

700MHz LTE/WiMAX™ Base Stations

GSM850/900 2G and 2.5G EDGE Base Stations

iDEN

Base Stations

Fixed Broadband Wireless Access

Wireless Local Loop

Private Mobile Radios

Military Systems

Features

 700MHz to 1000MHz RF Frequency Range

 900MHz to 1300MHz LO Frequency Range

 50MHz to 500MHz IF Frequency Range

 8.7dB Typical Conversion Gain

 9.0dB Typical Noise Figure

 +25.5dBm Typical Input IP3

 +12.6dBm Typical Input 1dB Compression Point

 76dBc Typical 2LO-2RF Spurious Rejection at

= -10dBm

 Dual Channels Ideal for Diversity Receiver

Applications

 48dB Typical Channel-to-Channel Isolation

 Low -3dBm to +3dBm LO Drive

 Integrated LO Buffer

 Internal RF and LO Baluns for Single-Ended

Inputs

 Built-In SPDT LO Switch with 46dB LO1-to-LO2

Isolation and 50ns Switching Time

 Pin Compatible with the MAX19995/MAX19995A

Series of 1700MHz to 2200MHz Mixers

 Pin Similar to the MAX19997A/MAX19999 Series

of 1850MHz to 3800MHz Mixers

 Single +5.0V or +3.3V Supply

 External Current-Setting Resistors Provide Option

for Operating Device in Reduced-Power/Reduced-

Performance Mode

MAX19985A

Dual, SiGe, High-Linearity, 700MHz to 1000MHz

Downconversion Mixer with LO Buffer/Switch

________________________________________________________________

Maxim Integrated Products

19-4185; Rev 0; 8/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

cdma2000 is a registered trademark of Telecommunications

Industry Association.

WiMAX is a trademark of WiMAX Forum.

iDEN is a registered trademark of Motorola, Inc.

Typical Application Circuit and Pin Configuration appear at

end of data sheet.

Denotes a lead-free/RoHS-compliant package.

EP = Exposed pad.

T = Tape and reel.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX19985AETX+ -40°C to +85°C 36 Thin QFN-EP*

MAX19985AETX+T -40°C to +85°C 36 Thin QFN-EP*

1 2 3 4 5 6 ... 22 23

MAX19985A 1

Podsumowanie treści

Strona 1 - MAX19985A

General DescriptionThe MAX19985A high-linearity, dual-channel, downcon-version mixer is designed to provide approximately8.7dB gain, +25.5dBm of IIP3,

Strona 2

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch10 ___________________________________________________

Strona 3

3LO-3RF RESPONSE vs. RF FREQUENCY(VARIOUS LO AND IF BIAS)MAX19985A toc45RF FREQUENCY (MHz)3LO-3RF RESPONSE (dBc)900800606555755070808545700 1000SEE TA

Strona 4

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch12 ___________________________________________________

Strona 5

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch______________________________________________________

Strona 6

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch14 ___________________________________________________

Strona 7

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch______________________________________________________

Strona 8

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch16 ___________________________________________________

Strona 9

Table 1. DC Current vs. Bias ResistorSettingsMAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch_________

Strona 10

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MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch______________________________________________________

Strona 12

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch2 ____________________________________________________

Strona 13

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Strona 14

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch______________________________________________________

Strona 15

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch22 ___________________________________________________

Strona 16

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/SwitchMaxim cannot assume responsibility for use of any circ

Strona 17

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch______________________________________________________

Strona 18

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch4 ____________________________________________________

Strona 19

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch______________________________________________________

Strona 20

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch6 ____________________________________________________

Strona 21

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch______________________________________________________

Strona 22

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch8 ____________________________________________________

Strona 23

MAX19985ADual, SiGe, High-Linearity, 700MHz to 1000MHzDownconversion Mixer with LO Buffer/Switch______________________________________________________

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