MAX9987, MAX9988 +14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation

Description

The MAX9987 and MAX9988 LO buffers/splitters each integrate a passive two-way power splitter with highisolation input and output buffer amplifiers. These buffers are designed to 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 MAX9987 is internally matched for the cellular/GSM bands, and the MAX9988 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 30dB output-to-output port isolation, and are offered in 5mm x 5mm 20-pin thin QFN packages with exposed paddle.

Key Features

Applications/Uses

	±1dB Output Power Variation
	+14dBm to +20dBm Adjustable Output Power
	Two-Way Power Splitting
	40dB Reverse Isolation
	More than 30dB Output-to-Output Isolation
	Low Output Noise: -170dBc/Hz at +17dBm
	160mA Supply Current at +17dBm
	Isolated PLL Output (+3dBm)

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

Key Specifications: VCOs/VCO Buffers

Part Number

Solutions

Applications

Min. Frequency (MHz)

Max. Frequency (MHz)

Features

Supply Current (mA)

Footprint (mm x mm)

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX9987

900MHz
Cellular
GPS
SAT
WLL

•

Cellular

•

ISM

700

1,100

•	+/- 1dB Output Power Variation

•	+14dBm to +20dBm Adjustable Output Power

•	160mA Supply Current at +17dBm

•	40dB Reverse Isolation

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

•	Two-Way Power Splitting

160

5.0 x 5.0

Yes

THIN QFN/20

$7.95 @ 1k

MAX9988

2.4GHz
Cellular
SAT
WLL

1,500

2,200

•	+/- 1dB Output Power Variation

•	+14dBm to +20dBm Adjustable Output Power

•	Two-Way Power Splitting

$7.95 @ 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.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-8 of 8

MAX9987

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX9987ETP

THIN QFN;20 pin;26 mm²
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T2055-3*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX9987ETP-T

THIN QFN;20 pin;26 mm²
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T2055-3*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX9987ETP+

THIN QFN;20 pin;26 mm²
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T2055+3*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX9987ETP+T

THIN QFN;20 pin;26 mm²
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T2055+3*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX9988

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX9988ETP

THIN QFN;20 pin;26 mm²
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T2055-3*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX9988ETP-T

THIN QFN;20 pin;26 mm²
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T2055-3*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX9988ETP+

THIN QFN;20 pin;26 mm²
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T2055+3*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX9988ETP+T

THIN QFN;20 pin;26 mm²
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T2055+3*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

Related Products

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