MAX9989 Maxim Integrated Products, MAX9989 Datasheet

MAX9989

Manufacturer Part Number

MAX9989

Description

(MAX9989 / MAX9990) +14dBm to +20dBm LO Buffers

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX9989.pdf (12 pages)

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The MAX9989 and MAX9990 LO buffers provide the high

output (+14dBm to +20dBm) necessary to drive the LO

inputs of high-linearity passive mixers, while offering 40dB

reverse isolation to prevent LO pulling. The MAX9989 is

internally matched for the cellular/GSM bands, and the

MAX9990 is matched for the DCS/PCS/UMTS bands.

The Typical Application Circuit provides a nominal

+17dBm output power with ±1dB variation over supply,

temperature, and input power. With two optional resis-

tors, the output power can be precision set from

+14dBm to +20dBm. The devices offer more than 35dB

main driver output to PLL amp output isolation. Each

device is offered in a 5mm

package with exposed paddle.

19-2486; Rev 0; 7/02

Typical Application Circuit/Pin Configuration appears at end of data sheet.

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.

Cellular/GSM/DCS/PCS/UMTS Base Station

Tx/Rx LO Drives

Coherent Receivers

ISM Wireless LAN

Wireless Local Loop

Local Multipoint Distribution Service

Point-to-Point Systems

________________________________________________________________ Maxim Integrated Products

PRESCALER

RF LO

TO PLL

General Description

5mm 20-pin thin QFN

(+3dBm)

(+7dBm)

OUTPLL

Applications

BIASIN

+14dBm to +20dBm LO Buffers

NETWORK

CONTROL

PLL BUFFER

BIAS

Typical Operating Circuit and Block Diagram

INPUT AMP

BIASOUT

MAX9989

MAX9990

OUTPUT AMP

o ±1dB Output Power Variation

o +14dBm to +20dBm Adjustable Output Power

o 40dB Reverse Isolation

o Better Than 35dB Main Driver Output to PLL Amp

o Low Output Noise: -170dBc/Hz at +17dBm

o 110mA Supply Current at +17dBm

o ESD Protection

o Isolated PLL Output (+3dBm)

*EP = Exposed paddle.

MAX9989ETP -40°C to +85°C

MAX9990ETP -40°C to +85°C 20 QFN-EP* 1500 to 2200

Output Isolation

PART

with ±1dB Variation

OUTLO

(+17dBm)

RANGE

TEMP

Ordering Information

RF INPUT

PIN-

PACKAGE

20 Thin

QFN-EP*

IF OUTPUT

www.DataSheet4U.com

Features

FREQUENCY

RANGE (MHz)

700 to 1100

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