19-1466; Rev 0; 6/99
UAL
IT MAN
TION K
A
ET
EVALU
TA SHE
WS DA
FOLLO
500MHz to 2500MHz
VCO Buffer Amplifiers
Features
o
+2.7V to +5.5V Supply Range
o
500MHz to 2500MHz Input Frequency Range
o
High Reverse Isolation: 49dB at 900MHz
o
Dual Open-Collector Outputs (MAX2472)
o
Adjustable -10dBm to -2dBm Output Power
Control (MAX2473)
o
High Input Impedance: >250Ω at 900MHz
o
Ultra-Small SOT23-6 Package
General Description
The MAX2472/MAX2473 are flexible, wideband, high-
reverse-isolation buffer amplifiers. The MAX2472 has dual
open-collector outputs capable of delivering -5dBm into
50Ω while maintaining harmonic suppression below
-25dBc. The MAX2473 has a single open-collector output
with a bias control pin to vary output power from -10dBm
to -2dBm while maintaining harmonic suppression below
-25dBc. The MAX2472/MAX2473’s combination of high
reverse isolation and low supply current makes them ideal
for applications requiring high performance with low
power. They feature high input impedance and open-col-
lector outputs for maximum flexibility, enabling them to be
used with a variety of oscillator topologies.
Both the MAX2472 and MAX2473 operate from a single
+2.7V to +5.5V supply. With V
CC
= +3.0V and -25dBm
input power, the MAX2472 consumes 5.2mA, while the
MAX2473 consumes only 2.7mA. Both devices are avail-
able in a tiny 6-pin SOT23 package requiring minimal
board space.
MAX2472/MAX2473
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
SOT
TOP MARK
AAAZ
AABA
MAX2472EUT-T
-40°C to +85°C
MAX2473EUT-T
-40°C to +85°C
Applications
Cellular and PCS Mobile Phones
Private Mobile Radios
ISM-Band Applications
IF/RF Oscillators
General-Purpose Buffers/Amplifiers
IN
Functional Diagrams
V
CC
BIAS
OUT2
MAX2472
OUT1
Typical Operating Circuits appear at end of data sheet.
GND
GND
Pin Configuration
TOP VIEW
OUT1 (OUT)
1
6
V
CC
V
CC
BIAS
BIAS
MAX2473
GND
2
MAX2472
MAX2473
5
GND
IN
OUT
OUT2 (BIAS)
3
4
IN
GND
GND
SOT23-6
( ) ARE FOR MAX2473.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
500MHz to 2500MHz
VCO Buffer Amplifiers
MAX2472/MAX2473
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..............................................................-0.3V to +7V
OUT1, OUT2, BIAS to GND........................-0.3V to (V
CC
+ 0.3V)
Maximum BIAS Pin Current................................................150µA
Maximum Input Power....................................................+10dBm
Continuous Power Dissipation
SOT23-6 (derate 8.7mW/°C above +70°C)...................696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+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
(V
CC
= +2.7V to +5.5V, P
IN
= -25dBm, IN driven from a 50Ω source, OUT_ LC-matched to 50Ω, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at V
CC
= +3V, T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage Range
SYMBOL
V
CC
MAX2472
MAX2473, R
BIAS
= 23kΩ
Supply Current
I
CC
MAX2473, R
BIAS
= 11kΩ
MAX2472
No drive
MAX2473, R
BIAS
= 23kΩ
MAX2473, R
BIAS
= 11kΩ
CONDITIONS
MIN
2.7
5.2
2.7
4.8
5.1
2.5
4.3
mA
TYP
MAX
5.5
8.0
UNITS
V
AC ELECTRICAL CHARACTERISTICS—MAX2472
(Typical
Operating Circuits,
V
CC
= +3V, P
IN
= -25dBm, IN driven from a 50Ω source, OUT1 and OUT2 LC matched to 50Ω, T
A
=
+25°C, unless otherwise noted.)
PARAMETER
Input Frequency Range (Note 2)
SYMBOL
f
IN
f
IN
= 600MHz
Transducer Gain
(IN to OUT2)
f
IN
= 900MHz, T
A
= +25°C
S
21
2
f
IN
= 900MHz, T
A
= T
MIN
to T
MAX
(Note 3)
f
IN
= 1900MHz
f
IN
= 2400MHz
f
IN
= 600MHz
Transducer Gain
(IN to OUT1)
Output 1dB Compression Point
Reverse Isolation
(IN to OUT2)
S
21
2
f
IN
= 900MHz
f
IN
= 1900MHz
f
IN
= 2400MHz
P
OUT1dB
f
IN
= 900MHz
f
IN
= 600MHz
S
12
2
f
IN
= 900MHz
f
IN
= 1900MHz
f
IN
= 2400MHz
7.8
6.6
7.5
6.0
13.0
9.2
6.8
5.3
-3.2
43
40
30
26
dB
dBm
dB
CONDITIONS
MIN
500
14.0
10.2
12.2
14.6
dB
TYP
MAX
2500
UNITS
MHz
2
_______________________________________________________________________________________
500MHz to 2500MHz
VCO Buffer Amplifiers
AC ELECTRICAL CHARACTERISTICS—MAX2472 (continued)
(Typical
Operating Circuits,
V
CC
= +3V, P
IN
= -25dBm, IN driven from a 50Ω source, OUT1 and OUT2 LC matched to 50Ω, T
A
=
+25°C, unless otherwise noted.)
PARAMETER
Reverse Isolation
(IN to OUT1)
SYMBOL
f
IN
= 600MHz
S
12
2
f
IN
= 900MHz
f
IN
= 1900MHz
f
IN
= 2400MHz
Noise Figure
Isolation (OUT1 to OUT2)
Harmonic Suppression
NF
f
IN
= 900MHz
f
IN
= 1900MHz
f
IN
= 900MHz
P
OUT
= -5dBm, f
IN
= 900MHz
CONDITIONS
MIN
TYP
54
49
34
30
9.5
10.2
24
-25
dB
dB
dBc
dB
MAX
UNITS
MAX2472/MAX2473
AC ELECTRICAL CHARACTERISTICS—MAX2473
(Typical
Operating Circuits,
V
CC
= +3V, P
IN
= -25dBm, R
BIAS
= 15kΩ, IN driven from a 50Ω source, OUT LC matched to 50Ω, T
A
=
+25°C, unless otherwise noted.)
PARAMETER
Input Frequency Range (Note 2)
SYMBOL
f
IN
f
IN
= 600MHz
f
IN
= 900MHz, T
A
= +25°C
Transducer Gain
S
21
2
f
IN
= 900MHz, T
A
= T
MIN
to T
MAX
(Note 3)
f
IN
= 1900MHz
f
IN
= 2400MHz
Output 1dB Compression Point
P
OUT1dB
f
IN
= 900MHz
f
IN
= 600MHz
Reverse Isolation
S
12
2
f
IN
= 900MHz
f
IN
= 1900MHz
f
IN
= 2400MHz
Noise Figure
Harmonic Suppression
NF
f
IN
= 900MHz
f
IN
= 1900MHz
P
OUT
= -5dBm, f
IN
= 900MHz
R
BIAS
= 23kΩ
R
BIAS
= 11kΩ
6.8
6.4
7.6
7.2
-6.0
-0.9
50
48
35
29
9.2
9.9
-25
dB
dBc
dB
dBm
CONDITIONS
MIN
500
14.8
11.8
16.8
19.0
dB
TYP
MAX
2500
UNITS
MHz
Note 1:
Limits are 100% production tested at T
A
= +25°C. Limits over the entire operating temperature range are guaranteed by
design and characterization but are not production tested.
Note 2:
This is the recommended operating frequency range. The parts have been characterized over the specified frequency
range and production tested at 900MHz. Operation outside of this range is possible but not guaranteed.
Note 3:
Guaranteed by design and characterization.
_______________________________________________________________________________________
3
500MHz to 2500MHz
VCO Buffer Amplifiers
MAX2472/MAX2473
Typical Operating Characteristics
(MAX2472/MAX2473 EV kit, V
CC
= +3V, T
A
= +25°C, unless otherwise noted.)
MAX2472
SUPPLY CURRENT vs. TEMPERATURE
P
IN
= -20dBm
f
IN
= 900MHz
MAX2472 toc01
S
21
2
vs. TEMPERATURE
14
12
10
f
IN
= 900MHz
f
IN
= 1900MHz
f
IN
= 600MHz
P
IN
= -20dBm
MAX2472 toc02
7.0
6.0
I
CC
(mA)
V
CC
= 5V
V
CC
= 3V
5.0
S
21 2
(dB)
8
6
4
2
f
IN
= 2400MHz
4.0
-40
-20
0
20
40
60
80
0
-50
-30
-10
10
30
50
70
90
TEMPERATURE (°C)
TEMPERATURE (°C)
S
21
2
vs. OUTPUT POWER
MAX2472 toc03
S
11
MAX2472 toc06
14
f
IN
= 600MHz
12
10
S
21 2
(dB)
f
IN
= 900MHz
8
6
4
2
FOR OUT1 WITH OUT2 REACTIVELY
MATCHED AND TERMINATED
-6
-4
-2
0
f
IN
= 2400MHz
f
IN
= 1900MHz
A
D
C
B
0
-20 -18 -16 -14 -12 -10 -8
P
OUT
(dBm)
FOR OUT2 WITH OUT1 BIASED
AND TERMINATED
A: f
IN
= 600MHz
B: f
IN
= 900MHz
C: f
IN
= 1900MHz
D: f
IN
= 2400MHz
S
21
MAX2472 toc07
S
12
MAX2472 toc08
S
22
MAX2472 toc09
D
C
D
C
BA
A
D
B
A
C
A: f
IN
= 600MHz
B: f
IN
= 900MHz
C: f
IN
= 1900MHz
D: f
IN
= 2400MHz
(0.1 UNITS FULL SCALE)
FOR OUT2 WITH OUT1 BIASED
AND TERMINATED
A: f
IN
= 600MHz
B: f
IN
= 900MHz
C: f
IN
= 1900MHz
D: f
IN
= 2400MHz
FOR OUT2 WITH OUT1 BIASED
AND TERMINATED
A: f
IN
= 600MHz
B: f
IN
= 900MHz
C: f
IN
= 1900MHz
D: f
IN
= 2400MHz
B
(3 UNITS FULL SCALE)
FOR OUT2 WITH OUT1 BIASED
AND TERMINATED
4
_______________________________________________________________________________________
500MHz to 2500MHz
VCO Buffer Amplifiers
Typical Operating Characteristics (continued)
(MAX2472/MAX2473 EV kit, V
CC
= +3V, T
A
= +25°C, unless otherwise noted.)
MAX2472/MAX2473
MAX2472
SCATTERING PARAMETERS
(IN to OUT 2)
_______________________________________________________________________________________
5
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