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MAX9987ETP+ |MAX9987ETPMAXINN/a560avai+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
MAX9987ETP+T |MAX9987ETPTMAXN/a7500avai+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
MAX9987ETP+T |MAX9987ETPTMAXIMN/a4855avai+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
MAX9988ETP+ |MAX9988ETPMAXN/a50avai+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
MAX9988ETP+ |MAX9988ETPMAXINN/a56avai+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
MAX9988ETP+T |MAX9988ETPTMAXIMN/a4564avai+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation


MAX9987ETP+T ,+14dBm to +20dBm LO Buffers/Splitters with ±1dB VariationFeaturesThe MAX9987 and MAX9988 LO buffers/splitters each♦ ±1dB Output Power Variationintegrate a p ..
MAX9987ETP+T ,+14dBm to +20dBm LO Buffers/Splitters with ±1dB VariationELECTRICAL CHARACTERISTICS—MAX9988(Typical Application Circuit, V = 4.75V to 5.25V, input and outpu ..
MAX9988ETP+ ,+14dBm to +20dBm LO Buffers/Splitters with ±1dB VariationBlock DiagramRF INPUTOUTPUT AMP(1)PLL BUFFER(1)MAX9987TO PLL OUTPLLOUT1MAX9988(+3dBm) IF OUTPUT PRE ..
MAX9988ETP+ ,+14dBm to +20dBm LO Buffers/Splitters with ±1dB VariationBlock DiagramRF INPUTOUTPUT AMP(1)PLL BUFFER(1)MAX9987TO PLL OUTPLLOUT1MAX9988(+3dBm) IF OUTPUT PRE ..
MAX9988ETP+T ,+14dBm to +20dBm LO Buffers/Splitters with ±1dB VariationELECTRICAL CHARACTERISTICS—MAX9987(Typical Application Circuit, V = 4.75V to 5.25V, input and outpu ..
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MAX9987ETP+-MAX9987ETP+T-MAX9988ETP+-MAX9988ETP+T
+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.
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
Features
±1dB Output Power Variation+14dBm to +20dBm Adjustable Output PowerTwo-Way Power Splitting40dB Reverse IsolationMore than 30dB Output-to-Output IsolationLow Output Noise: -170dBc/Hz at +17dBm160mA Supply Current at +17dBmIsolated PLL Output (+3dBm)
MAX9987/MAX9988
+14dBm to +20dBm LO Buffers/Splitters
with ±1dB Variation

MAX9987
MAX9988
BIAS
BIASIN
RF LO
TO PLL
PRESCALER
PLL BUFFER
INPUT AMP
OUTPUT AMP
(2)
OUTPUT AMP
(1)
RF INPUT
(1)
IF OUTPUT
(1)
PASSIVE TWO-WAY
POWER SPLITTER
(+7dBm)
OUTPLL
(+3dBm)OUT1
(+17dBm)
OUT2
(+17dBm)
BIASOUT
BIAS
CONTROL
NETWORK
RF INPUT
(2)
IF OUTPUT
(2)
Typical Operating Circuit and Block Diagram
Ordering Information

19-2416; Rev 2; 3/04
PARTTEMP
RANGE
PIN-
PACKAGE
FREQUENCY
RANGE
MAX9987ETP-T
-40°C to 85°C20 Thin
QFN-EP*
700MHz to
1100MHz
MAX9988ETP-T
-40°C to 85°C20 Thin
QFN-EP*
1500MHz to
2200MHz
*EP= Exposed paddle.
MAX9987/MAX9988
+14dBm to +20dBm LO Buffers/Splitters
with ±1dB Variation
ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCC1, VCC2, VCC3,
VCCREF to GND.................................................-0.3V to +6.0V
IN to GND...................................................-0.3V to (VCC+ 0.3V)
OUT1, OUT2,
OUTPLL to GND......................................-0.3V to (VCC+ 0.3V)
REF to GND......................................................Source/Sink 5mA
INBIAS, OUTBIAS, to GND..................................-0.3V to +0.75V
PLLBIAS......................................................................Sink 25mA
RF Input Power...............................................................+20dBm
Continuous Power Dissipation (TA= +70°C)
5mm ✕5mm 20-Pin Thin QFN (derate 20mW/°C
above +70°C).............................................................1600mW
θJA....................................................................................50°C/W
Junction Temperature......................................................+150°C
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
DC ELECTRICAL CHARACTERISTICS—MAX9987

(Typical Application Circuit, VCC= 4.75V to 5.25V, input and outputs terminated in 50Ω, TA= -40°C to +85°C. Typical specifications
are for VCC= 5.0V and TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply VoltageVCC4.755.005.25V
Low power setting
(see Table 1 for resistor values)110
Nominal power setting
(R1, R2, R4, and R5 not installed)139155171Supply CurrentICC
High power setting
(see Table 1 for resistor values)221
DC ELECTRICAL CHARACTERISTICS—MAX9988

(Typical Application Circuit, VCC= 4.75V to 5.25V, input and outputs terminated in 50Ω, TA= -40°C to +85°C. Typical specifications
are for VCC= 5.0V and TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply VoltageVCC4.755.005.25V
Low power setting
(see Table 1 for resistor values)120
Nominal power setting
(R1, R2, R4, and R5 not installed)150162175Supply CurrentICC
High power setting
(see Table 1 for resistor values)229
MAX9987/MAX9988
+14dBm to +20dBm LO Buffers/Splitters
with ±1dB Variation
AC ELECTRICAL CHARACTERISTICS—MAX9987

(Typical Application Circuit, VCC= 4.75V to 5.25V, 50Ωenvironment, +4dBm < PIN< +10dBm, 700MHz < fIN< 1100MHz, = -40°C to +85°C, unless otherwise noted. Typical specifications are for VCC= 5.0V, PIN= +7dBm, fIN= 900MHz, and = +25°C, unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Operating Frequencyf7001100MHz
Low power setting, PIN = +4dBm
(see Table 1 for resistor values)14.3
Nominal power setting,
+4dBm < PIN < +10dBm, 4.75V < VCC <
5.25V, -40°C < TA < +85°C
(R1, R2, R4, and R5 not installed)
±0.8Output Power (Main Drivers)POUTLO
High power setting, PIN = +10dBm
(see Table 1 for resistor values)19.7
dBm
Output Power (PLL Driver)POUTPLL3.7dBm
Input VSWRVSWRIN1.2:1
Output VSWRVSWROUT1.7:1
Output-Noise Power DensityPNOISEVCC = 5.0V, ±100MHz offset
(R1, R2, R4, and R5 not installed)-152dBm/Hz
OUT1 to OUT2 IsolationS23VCC = 5.0V, nominal power setting
(R1, R2, R4, and R5 not installed)45dB
OUT2 to OUT1 IsolationS32VCC = 5.0V, nominal power setting
(R1, R2, R4, and R5 not installed)39dB
OUT1 to RFIN IsolationS12VCC = 5.0V, nominal power setting
(R1, R2, R4, and R5 not installed)48dB
OUT2 to RFIN IsolationS13VCC = 5.0V, nominal power setting
(R1, R2, R4, and R5 not installed)50dB
MAX9987/MAX9988
+14dBm to +20dBm LO Buffers/Splitters
with ±1dB Variation
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Operating Frequencyf15002200MHz
Low power setting, PIN = +6dBm
(see Table 1 for resistor values)14.2
Nominal power setting,
+6dBm < PIN < +12dBm, 4.75V < VCC <
5.25V, -40°C < TA < +85°C
(R1, R2, R4, and R5 not installed)
±0.8
Output Power
(Main Drivers)POUTLO
High power setting, PIN = +12dBm
(see Table 1 for resistor values)19.5
dBm
Output Power
(PLL Driver)POUTPLL3.6dBm
Input VSWRVSWRIN1.5:1
Output VSWRVSWROUT1.4:1
Output-Noise Power DensityPNOISEVCC = 5.0V, ±100MHz offset-152dBm/Hz
OUT1 to OUT2 IsolationS23VCC = 5.0V, nominal power setting
(R1, R2, R4, and R5 not installed)33dB
OUT2 to OUT1 IsolationS32VCC = 5.0V, nominal power setting
(R1, R2, R4, and R5 not installed)44dB
OUT1 to RFIN IsolationS12VCC = 5.0V, nominal power setting
(R1, R2, R4, and R5 not installed)49dB
OUT2 to RFIN IsolationS13VCC = 5.0V, nominal power setting
(R1, R2, R4, and R5 not installed)47dB
AC ELECTRICAL CHARACTERISTICS—MAX9988

(Typical Application Circuit, VCC= 4.75V to 5.25V, 50Ωenvironment, +6dBm < PIN< +12dBm, 1500MHz < fIN< 2200MHz, and = -40°C to +85°C, unless otherwise noted. Typical specifications are for VCC= 5.0V, PIN= +9dBm, fIN= 1800MHz, and = +25°C unless otherwise noted.) (Note 1)
Note 1:
Devices are 100% DC screened and AC production tested for functionality. Data sheet typical specifications are derived
from the average of 30 units from a typical lot, and are tested under the conditions specified for the typical specifications.
MAX9987/MAX9988
+14dBm to +20dBm LO Buffers/Splitters
with ±1dB Variation
SUPPLY CURRENT vs. OUTPUT POWER
OUTMAIN

MAX9987 toc01
OUTPUT POWER (dBm)
SUPPLY CURRENT (mA)151050-5-10
TA = -40°C
TA = +25°C AND +85°C
OUTPUT POWER vs. INPUT POWER
OUT1

MAX9987 toc02
INPUT POWER (dBm)
OUTPUT POWER (dBm)23-3-41087-2-101456
TA = +85°C
TA = +25°C
TA = -40°C
OUTPUT POWER vs. INPUT POWER
OUT2

MAX9987 toc03
INPUT POWER (dBm)
OUTPUT POWER (dBm)23-3-41087-2-101456
TA = +85°C
TA = +25°C
TA = -40°C
OUTPUT POWER vs. INPUT POWER, OUTPLL

MAX9987 toc04
INPUT POWER (dBm)
OUTPUT POWER (dBm)624-20-410
TA = +85°C
TA = +25°C
TA = -40°C
OUTPUT POWER vs. FREQUENCY, OUT1

MAX9987 toc05
OPERATING FREQUENCY (MHz)
OUTPUT POWER (dBm)
TA = +85°C
TA = +25°CTA = -40°C
OUTPUT POWER vs. FREQUENCY, OUT2

MAX9987 toc06
OPERATING FREQUENCY (MHz)
OUTPUT POWER (dBm)
TA = +85°C
TA = +25°CTA = -40°C
OUTPUT POWER vs. FREQUENCY, PLL

MAX9987 toc07
OPERATING FREQUENCY (MHz)
OUTPUT POWER (dBm)
TA = +85°CTA = +25°C
TA = -40°C
OUTPUT POWER AND SUPPLY CURRENT
vs. TEMPERATURE

MAX9987 toc08
AMBIENT TEMPERATURE (°C)
OUTPUT POWER (dBm)6020400-20
ICC
SUPPLY CURRENT (mA)
POUT
OUTPUT POWER vs. SUPPLY VOLTAGE

MAX9987 toc09
SUPPLY VOLTAGE (V)
OUT1, OUT2 OUTPUT POWER (dBm)
17.5OUT2
OUT1
OUTPLL
PLL OUTPUT POWER (dBm)
Typical Operating Characteristics

(VCC= 5.0V, nominal bias, fIN= 900MHz, PIN= +7dBm, TA= +25°C, unless otherwise noted.) (Shaded regions are outside the
guaranteed operating range, and are provided for reference only.)
MAX9987
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