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MAX9987ETP+

Description
RF Amplifier 14dBm to 20dBm LO Buffer/Splitter
CategoryTopical application    Wireless rf/communication   
File Size880KB,12 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Environmental Compliance
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MAX9987ETP+ Overview

RF Amplifier 14dBm to 20dBm LO Buffer/Splitter

MAX9987ETP+ Parametric

Parameter NameAttribute value
Product AttributeAttribute Value
ManufacturerMaxim
Product CategoryRF Amplifier
RoHSDetails
Mounting StyleSMD/SMT
Package / CaseTQFN-EP-20
TypeLO Buffer/Splitter
Operating Frequency700 MHz to 1.1 GHz
Operating Supply Voltage5 V
NF - Noise Figure- 170 dB
Operating Supply Current221 mA
Minimum Operating Temperature- 40 C
Maximum Operating Temperature+ 85 C
PackagingTube
Factory Pack Quantity60
Supply Voltage - Max5.25 V
Supply Voltage - Min4.75 V
19-2416; Rev 2; 3/04
+14dBm to +20dBm LO Buffers/Splitters
with ±1dB Variation
General Description
The MAX9987 and MAX9988 LO buffers/splitters each
integrate a passive two-way power splitter with high-
isolation 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 resis-
tors, 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
5mm 20-pin thin QFN packages with exposed paddle.
±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)
Features
MAX9987/MAX9988
Applications
Cellular/GSM/DCS/PCS/UMTS Base Station
Tx/Rx LO Drive
Base Station Main and Diversity Channels
Coherent Receivers
ISM Wireless LAN
Wireless Local Loop
Local Multipoint Distribution Service
Point-to-Point Systems
*EP =
Exposed paddle.
PART
Ordering Information
TEMP
RANGE
PIN-
PACKAGE
20 Thin
QFN-EP*
20 Thin
QFN-EP*
FREQUENCY
RANGE
700MHz to
1100MHz
1500MHz to
2200MHz
MAX9987ETP-T
-40°C to 85°C
MAX9988ETP-T
-40°C to 85°C
Typical Operating Circuit and Block Diagram
PLL BUFFER
TO PLL
PRESCALER
OUTPLL
(+3dBm)
OUTPUT AMP
(1)
OUT1
(+17dBm)
RF INPUT
(1)
MAX9987
MAX9988
IF OUTPUT
(1)
IN
(+7dBm)
RF LO
INPUT AMP
PASSIVE TWO-WAY
POWER SPLITTER
BIAS
OUTPUT AMP
(2)
BIASIN
BIASOUT
OUT2
(+17dBm)
RF INPUT
(2)
IF OUTPUT
(2)
BIAS
CONTROL
NETWORK
________________________________________________________________
Maxim Integrated Products
1
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.

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