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MAX9990

+14dBm to +20dBm LO Buffers with ±1dB Variation

Please check latest availability status for a specific part variant.

Overview

Description

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 resistors, 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 x 5mm 20-pin thin QFN package with exposed paddle.

MAX9989, MAX9990: Typical Operating Circuit

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Key Features

±1dB Output Power Variation

+14dBm to +20dBm Adjustable Output Power

40dB Reverse Isolation

Better Than 35dB Main Driver Output to PLL Amp Output Isolation

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

110mA Supply Current at +17dBm

ESD Protection

Isolated PLL Output (+3dBm)

Applications/Uses

Cellular/GSM/DCS/PCS/UMTS Base Station Tx/Rx LO Drive
Coherent Receivers
ISM Wireless LAN
Local Multipoint Distribution Service
Point-to-Point Systems
Wireless Local Loop (WLL)

Parametric Specs

See parametric specs for VCO Buffers/Splitters (7)

Part Number

LO Driver Outputs

PLL Driver Outputs

RF Freq.
(MHz)

P_OUT
(dBm)

V_CC
(V)

I_SUPPLY
(mA)

Footprint
(mm x mm)

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX9989

Yes

700

1100

14.3

19.7

4.75 to 5.25

105

5.0 x 5.0

TQFN/20

MAX9990

1500

2200

14.2

19.5

111

TQFN/20

$4.45 @1k

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
App Note 1917 Simplifying Tomorrow's LO Drive Designs with the MAX9987-90 Family of LO Buffers/Splitters

Quality And Environmental

Request Reliability Report for: MAX9990

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C	Material Composition

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Technical Docs

Type	ID	Title
Tutorial	5100	General Layout Guidelines for RF and Mixed-Signal PCBs
App Note	1917	Simplifying Tomorrow's LO Drive Designs with the MAX9987-90 Family of LO Buffers/Splitters