19-2486; Rev 0; 7/02
+14dBm to +20dBm LO Buffers
with ±1dB Variation
General 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 resis-
tors, 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
✕
5mm 20-pin thin QFN
package with exposed paddle.
o
±1dB Output Power Variation
o
+14dBm to +20dBm Adjustable Output Power
o
40dB Reverse Isolation
o
Better Than 35dB Main Driver Output to PLL Amp
Output Isolation
o
Low Output Noise: -170dBc/Hz at +17dBm
o
110mA Supply Current at +17dBm
o
ESD Protection
o
Isolated PLL Output (+3dBm)
Features
MAX9989/MAX9990
Applications
Cellular/GSM/DCS/PCS/UMTS Base Station
Tx/Rx LO Drives
Coherent Receivers
ISM Wireless LAN
Wireless Local Loop
Local Multipoint Distribution Service
Point-to-Point Systems
PART
Ordering Information
TEMP
RANGE
PIN-
PACKAGE
20 Thin
QFN-EP*
FREQUENCY
RANGE (MHz)
700 to 1100
MAX9989ETP
-40°C to +85°C
MAX9990ETP
-40°C to +85°C 20 QFN-EP* 1500 to 2200
*EP =
Exposed paddle.
Typical Application Circuit/Pin Configuration appears at end of data sheet.
Typical Operating Circuit and Block Diagram
PLL BUFFER
TO PLL
PRESCALER
OUTPLL
(+3dBm)
MAX9989
MAX9990
OUTPUT AMP
INPUT AMP
RF INPUT
IN
(+7dBm)
RF LO
OUTLO
(+17dBm)
IF OUTPUT
BIAS
BIASIN
BIASOUT
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.
+14dBm to +20dBm LO Buffers
with ±1dB Variation
MAX9989/MAX9990
ABSOLUTE MAXIMUM RATINGS
VCC1, VCC2, VCC3, VCCREF to GND .................-0.3V to +6.0V
IN to GND ...................................................-0.3V to (V
CC
+ 0.3V)
OUTLO, OUTPLL to GND...........................-0.3V to (V
CC
+ 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 (T
A
= +70°C)
20-Pin Thin QFN (derate 21mW/°C above +70°C) ....1667mW
θ
JA
.................................................................................+48°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
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.
DC ELECTRICAL CHARACTERISTICS—MAX9989
(Typical
Application Circuit,
V
CC
= 4.75V to 5.25V, input and outputs terminated in 50Ω, T
A
= -40°C to +85°C. Typical specifications
are for V
CC
= 5.0V and T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage
SYMBOL
V
CC
Low power setting
(see Table 1 for resistor values)
Supply Current
I
CC
Nominal power setting
(R2–R5 not installed) (Note 2)
High power setting
(see Table 1 for resistor values)
94
CONDITIONS
MIN
4.75
TYP
5.00
77
105
146
116
mA
MAX
5.25
UNITS
V
DC ELECTRICAL CHARACTERISTICS—MAX9990
(Typical
Application Circuit,
V
CC
= 4.75V to 5.25V, input and outputs terminated in 50Ω, T
A
= -40°C to +85°C. Typical specifications
are for V
CC
= 5.0V and T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage
SYMBOL
V
CC
Low power setting
(see Table 1 for resistor values)
Supply Current
I
CC
Nominal power setting
(R2–R5 not installed) (Note 2)
High power setting
(see Table 1 for resistor values)
98
CONDITIONS
MIN
4.75
TYP
5.00
87
111
154
122
mA
MAX
5.25
UNITS
V
2
_______________________________________________________________________________________
+14dBm to +20dBm LO Buffers
with ±1dB Variation
AC ELECTRICAL CHARACTERISTICS—MAX9989
(Typical
Application Circuit,
V
CC
= 4.75V to 5.25V, 50Ω environment, +4dBm < P
IN
< +10dBm, 700MHz < f
IN
< 1100MHz,
T
A
= -40°C to +85°C, unless otherwise noted. Typical specifications are for V
CC
= 5.0V, P
IN
= +7dBm, f
IN
= 900MHz, and
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Operating Frequency
SYMBOL
f
CONDITIONS
Low power setting, P
IN
= +4dBm
(see Table 1 for resistor values)
Nominal power setting,
+4dBm < P
IN
< +10dBm
4.75V < V
CC
< 5.25V
-40°C < T
A
< +85°C (R2–R5 not installed)
High power setting, P
IN
= +10dBm
(see Table 1 for resistor values)
Output Power (PLL Driver)
Input VSWR
Output VSWR
Output-Noise Power Density
OUTLO to RFIN Isolation
P
OUTPLL
VSWR
IN
VSWR
OUT
P
NOISE
S12
V
CC
= 5.0V, ±100MHz offset
(R2–R5 not installed)
V
CC
= 5.0V, nominal power setting
(R2–R5 not installed)
MIN
700
TYP
MAX
1100
UNITS
MHz
MAX9989/MAX9990
14.3
Output Power
P
OUTLO
17.3
±0.8
dBm
19.7
3.7
1.2:1
1.7:1
-152
48
dBm/Hz
dB
dBm
AC ELECTRICAL CHARACTERISTICS—MAX9990
(Typical
Application Circuit,
V
CC
= 4.75V to 5.25V, 50Ω environment, +6dBm < P
IN
< +12dBm, 1500MHz < f
IN
< 2200MHz, and
T
A
= -40°C to +85°C, unless otherwise noted. Typical specifications are for V
CC
= 5.0V, P
IN
= +9dBm, f
IN
= 1800MHz, and
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Operating Frequency
SYMBOL
f
Low power setting, P
IN
= +6dBm
(see Table 1 for resistor values)
Nominal power setting,
+6dBm < P
IN
< +12dBm
4.75V < V
CC
< 5.25V
-40°C < T
A
< +85°C (R2–R5 not installed)
High power setting, P
IN
= +12dBm
(see Table 1 for resistor values)
Output Power (PLL Driver)
Input VSWR
Output VSWR
Output-Noise Power Density
OUTLO to RFIN Isolation
P
OUTPLL
VSWR
IN
VSWR
OUT
P
NOISE
S12
V
CC
= 5.0V, ±100MHz offset
V
CC
= 5.0V, nominal power setting
(R2–R5 not installed)
CONDITIONS
MIN
1500
14.2
TYP
MAX
2200
UNITS
MHz
Output Power
P
OUTLO
17.3
±0.8
dBm
19.5
3.6
1.5:1
1.4:1
-152
49
dBm/Hz
dB
dBm
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.
Note 2:
DC current limits at -40°C are guaranteed by design and characterization.
_______________________________________________________________________________________
3
+14dBm to +20dBm LO Buffers
with ±1dB Variation
MAX9989/MAX9990
Typical Operating Characteristics
(V
CC
= 5.0V, nominal bias, f
IN
= 900MHz, P
IN
= +7dBm, T
A
= +25°C, unless otherwise noted.) (Shaded regions are outside the
guaranteed operating range, and are provided for reference only.)
MAX9989
SUPPLY CURRENT vs. OUTPUT POWER
OUTLO
MAX9989 toc01
OUTPUT POWER vs. INPUT POWER
OUTLO
MAX9989 toc02
OUTPUT POWER vs. INPUT POWER
OUTPLL
5
4
OUTPUT POWER (dBm)
3
2
1
0
-1
-2
-3
-4
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
MAX9989 toc03
120
20
19
18
OUTPUT POWER (dBm)
17
16
15
14
13
12
T
A
= +85°C
T
A
= -40°C
T
A
= +25°C
6
SUPPLY CURRENT (mA)
115
T
A
= +85°C
110
T
A
= +25°C
105
T
A
= -40°C
100
10 11 12 13 14 15 16 17 18 19 20
OUTPUT POWER (dBm)
11
10
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
INPUT POWER (dBm)
-6
-4
-2
0
2
4
6
8
10
INPUT POWER (dBm)
OUTPUT POWER vs. FREQUENCY
OUTLO
MAX9989 toc04
OUTPUT POWER vs. FREQUENCY
OUTPLL
MAX9989 toc05
20
19
OUTPUT POWER (dBm)
18
17
16
15
14
500
600
700
800
900
T
A
= +85°C
7
6
OUTPUT POWER (dBm)
5
4
3
2
1
0
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
T
A
= +25°C
1000 1100 1200
500
600
700
800
900
1000 1100 1200
OPERATING FREQUENCY (MHz)
OPERATING FREQUENCY (MHz)
OUTPUT POWER AND SUPPLY CURRENT
vs. TEMPERATURE
18.0
17.8
17.6
OUTPUT POWER (dBm)
17.4
17.2
17.0
16.8
16.6
16.4
16.2
16.0
-40
-20
0
20
40
60
80
AMBIENT TEMPERATURE (°C)
P
OUTLO
I
CC
MAX9989 toc06
OUTPUT POWER vs. SUPPLY VOLTAGE
112.0
111.5
111.0
110.5
110.0
109.5
109.0
108.5
108.0
107.5
107.0
SUPPLY CURRENT (mA)
OUTLO OUTPUT POWER (dBm)
18.0
17.5
OUTLO
17.0
16.5
16.0
15.5
15.0
14.5
14.0
4.5
4.7
4.9
5.1
5.3
5.5
SUPPLY VOLTAGE (V)
OUTPLL
MAX9989 toc07
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
OUTPLL OUTPUT POWER (dBm)
4
_______________________________________________________________________________________
+14dBm to +20dBm LO Buffers
with ±1dB Variation
MAX9989/MAX9990
Typical Operating Characteristics (continued)
(V
CC
= 5.0V, nominal bias, f
IN
= 900MHz, P
IN
= +7dBm, T
A
= +25°C, unless otherwise noted.) (Shaded regions are outside the
guaranteed operating range, and are provided for reference only.)
MAX9989
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9989 toc08
SMALL-SIGNAL GAIN vs. FREQUENCY
V
CC
= 5V
T
A
= +25°C
P
IN
= -15dBm
NOMINAL BIAS
MAX9989 toc09
INPUT RETURN LOSS vs. FREQUENCY
-5
-10
RETURN LOSS (dB)
-15
-20
-25
-30
V
CC
= 5V
T
A
= +25°C
P
IN
= +7dBm
MAX9989 toc10
120
115
SUPPLY CURRENT (mA)
110
105
100
95
90
4.5
4.7
4.9
5.1
5.3
PLL NOT BIASED
PLL BIASED
19
18
17
GAIN (dB)
16
15
14
13
0
-35
-40
500
600
700
800
900
1000 1100 1200
500
600
700
800
900
1000
1100
FREQUENCY (MHz)
FREQUENCY (MHz)
5.5
SUPPLY VOLTAGE (V)
OUTPUT RETURN LOSS vs. FREQUENCY
2
4
RETURN LOSS (dB)
6
8
10
12
14
16
18
20
500
600
700
800
900
1000
1100
FREQUENCY (MHz)
OUTPLL
OUTLO
V
CC
= 5V
T
A
= +25°C
P
IN
= +7dBm
MAX9989 toc11
OUT-TO-IN ISOLATION vs. FREQUENCY
-25
-30
ISOLATION (dB)
-35
-40
-45
-50
-55
-60
-65
-70
500
600
700
800
900
1000
1100
FREQUENCY (MHz)
OUTLO TO IN
OUTPLL TO IN
V
CC
= 5V
T
A
= +25°C
P
IN
= +7dBm
MAX9989 toc12
0
-20
PLL ISOLATION vs. FREQUENCY
MAX9989 toc13
OUTPUT NOISE POWER vs. INPUT POWER
±100MHz
OFFSET
NOISE POWER (dBm/Hz)
-145
MAX9989 toc14
-20
-25
-30
ISOLATION (dB)
-35
-40
-45
-50
-55
-60
-65
-70
500
600
700
800
900
1000
OUTLO TO OUTPLL
OUTPLL TO
OUTLO
V
CC
= 5V
T
A
= +25°C
P
IN
= +7dBm
-140
-150
-155
-160
1100
4
5
6
7
8
9
10
11
12
13
FREQUENCY (MHz)
INPUT POWER (dBm)
_______________________________________________________________________________________
5
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