MAX9989, MAX9990 +14dBm to +20dBm LO Buffers with ±1dB Variation

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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 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.

Key Features

Applications/Uses

	±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)

	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)

Key Specifications: VCOs/VCO Buffers

Part Number

Min. Frequency (MHz)

Max. Frequency (MHz)

Features

Supply Current (mA)

Footprint (mm x mm)

Package

Price^**

MAX9989

700

1,100

•	+14dBm to +20dBm Adjustable Output Power

•	-170dBc/Hz at +17dBm Output Noise

•	110mA at +17dBm

•	40dB Reverse Isolation

•	Isolated PLL Output

110

5.0 x 5.0

THIN QFN/20

$3.52 @ 1k

MAX9990

1,500

2,200

•	+/- 1dB Output Power Variation

•	+14dBm to +20dBm Adjustable Output Power

•	-170dBc/Hz at +17dBm Output Noise

•	110mA at +17dBm

•	40dB Reverse Isolation

•	Isolated PLL Output

$3.52 @ 1k

See All VCOs/VCO Buffers (21)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.