General Description
The MAX4003 low-cost, low-power logarithmic amplifier
is designed to detect the power levels of RF power
amplifiers (PAs) operating from 100MHz to 2500MHz. A
typical dynamic range of 45dB makes this logarithmic
amplifier useful in a variety of wireless applications
including cellular handset PA control, TSSI for wireless
terminal devices, and other transmitter power measure-
ments. This logarithmic amplifier provides much wider
measurement range and superior accuracy than typical
diode-based detectors. Excellent temperature stability is
achieved over the full operating range of -40C to +85C.
The MAX4003 logarithmic amplifier is a voltage-mea-
suring device with a typical signal range of -58dBV to
-13dBV. The input signal is internally AC-coupled by an
on-chip 5pF capacitor in series with a 2k
resistance.
This highpass coupling, with a corner at 16MHz, sets
the lowest operating frequency and allows the input
signal source to be DC grounded. The MAX4003 also
features a power-on delay, which holds the detector
output (OUT) low for approximately 5s to ensure
glitchless controller output.
The MAX4003 is available in an 8-bump chip-scale pack-
age (UCSPTM), an 8-pin MAX package, and an 8-pin thin
QFN package. The device consumes 5.9mA with a 3.0V
supply and only 13A when the device is in shutdown.
Applications
Cellular Handsets (TDMA, CDMA, GPRS, GSM)
TSSI for Wireless Terminal Devices
Transmitter Power Measurement and Control
RSSI for Fiber Modules
Features
o Complete RF Detector
o Frequency Range from 100MHz to 2500MHz
o Input Range of -58dBV to -13dBV
(-45dBm to 0dBm into 50
)
o Fast Response: 70ns in 10dB Steps
o Low-Current Consumption: 5.9mA at V
CC
= 3.0V
o 13A (typ) Shutdown Current
o Available in 8-Bump UCSP or 8-Pin MAX and
Thin QFN Packages
MAX4003
100MHz to 2500MHz, 45dB RF Detector
in a UCSP
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
10dB
DET
10dB
10dB
10dB
DET
DET
DET
DET
OFFSET
COMP
LOW-
NOISE
BANDGAP
OUTPUT
ENABLE
DELAY
GND
g
m
+
-
1X
V-I
RFIN
V
CC
SHDN
OUT
CLPF
MAX4003
Functional Diagram
19-2620; Rev 1; 3/03
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.
PART
TEMP RANGE
PIN/BUMP-
PACKAGE
TOP
MARK
MAX4003EBL-T
-40
C to +85C 8 UCSP-8
ABV
MAX4003EUA
-40
C to +85C 8 MAX
--
MAX4003ETA-T
-40
C to +85C 8 Thi n QFN - E P ADG
Pin Configurations
MAX4003
1
2
3
4
8
7
6
5
V
CC
OUT
N.C.
GND
CLPF
A
1
2
3
B
C
GND
RFIN
MAX
SHDN
RFIN
GND
V
CC
CLPF
V
CC
OUT
GND
SHDN
MAX4003
UCSP
TOP VIEW
(BUMPS ON BOTTOM)
TOP VIEW
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations continued at end of data sheet.
MAX4003
100MHz to 2500MHz, 45dB RF Detector
in a UCSP
2
_______________________________________________________________________________________
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.
V
CC
to GND .........................................................-0.3V to +5.25V
SHDN, CLPF to GND..................................-0.3V to (V
CC
+ 0.3V)
RFIN..................................................................................+6dBm
OUT Short Circuit to GND.......................................................10s
Continuous Power Dissipation (T
A
= +70C)
8-Bump UCSP (derate 4.7mW/C above +70C).........379mW
8-Pin MAX (derate 4.5mW/C above +70C) .............362mW
8-Pin Thin QFN (derate 24.4mW/C above +70C) ...1951mW
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 3.0V, V
SHDN
= V
CC
, C
CLPF
= 0.1F, T
A
= -40
C to +85C. Typical values are at T
A
= +25
C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
CC
2.7
5.0
V
V
SHDN
= 1.8V
5.9
10
mA
Supply Current
I
CC
V
CC
= 5.0V
V
SHDN
= 0.8V
13
30
A
V
SHDN
= 3.0V
5
20
Shutdown Input Current
I
SHDN
V
SHDN
= 0V
-0.01
5
A
Logic High Threshold Voltage
V
IH
1.8
V
Logic Low Threshold Voltage
V
IL
0.8
V
DETECTOR OUTPUT
RFIN = 0dBm
1.45
Voltage Range
V
OUT
RFIN = -45dBm
0.36
V
Output Voltage in Shutdown
V
OUT
V
SHDN
= 0V
1
mV
Output-Referred Noise
f
o
=150kHz
8
nV/
Hz
Small-Signal Bandwidth
BW
C
CLPF
= 150pF
8
MHz
Slew Rate
V
OUT
= 0.36V to 1.45V, C
CLPF
= 150pF
5
V/s
MAX4003
100MHz to 2500MHz, 45dB RF Detector
in a UCSP
_______________________________________________________________________________________
3
Note 1: All devices are 100% production tested at T
A
= +25C and are guaranteed by design for T
A
= -40C to +85C as specified.
All production AC tests are done at 100MHz.
Note 2: Typical minimum and maximum range of the detector.
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 3.0V, V
SHDN
= V
CC
, C
CLPF
= 0.1F, f
RF
= 100MHz to 2500MHz, T
A
= -40
C to +85C. Typical values are at T
A
= +25
C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RF Input Frequency Range
f
RF
100
2500
MHz
RF Input Voltage Range
V
RF
(Note 2)
-58
-13
dBV
Equivalent RF Input Power Range
P
RF
With 50
termination (Note 2)
-45
0
dBm
f
RF
= 100MHz, T
A
= +25C
22.8
25.5
28.2
f
RF
= 100MHz
22.5
28.5
f
RF
= 900MHz
25.0
Logarithmic Slope
f
RF
= 1900MHz
29.0
mV/dB
f
RF
= 100MHz, T
A
= +25C
-62.3
-57
-51.7
f
RF
= 100MHz
-64
-50
f
RF
= 900MHz
-57
Logarithmic Intercept
P
X
f
RF
= 1900MHz
-56
dBm
R
IN
2
k
RFIN Input Impedance
C
IN
0.5
pF
OUTPUT VOLTAGE
vs. INPUT POWER (
MAX)
MAX4003 toc01
INPUT POWER (dBm)
V
OUT
(V)
0
-10
-50
-40
-30
-20
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-60
10
2.5GHz
1.9GHz
0.9GHz
0.1GHz
OUTPUT VOLTAGE
vs. INPUT POWER (UCSP)
MAX4003 toc02
INPUT POWER (dBm)
V
OUT
(V)
0
-10
-30
-20
-40
-50
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
-60
10
2.5GHz
1.9GHz
0.9GHz
0.1GHz
LOG CONFORMANCE
vs. INPUT POWER (
MAX)
MAX4003 toc03
INPUT POWER (dBm)
ERROR (dB)
0
-10
-40
-30
-20
-3
-2
-1
0
1
2
3
4
-4
-50
10
2.5GHz
1.9GHz
0.9GHz
0.1GHz
Typical Operating Characteristics
(V
CC
= V
SHDN
= 3.0V, C
CLPF
= 0.1F, T
A
= +25C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(V
CC
= V
SHDN
= 3.0V, C
CLPF
= 0.1F, T
A
= +25C, unless otherwise noted.)
MAX4003
100MHz to 2500MHz, 45dB RF Detector
in a UCSP
4
_______________________________________________________________________________________
LOG CONFORMANCE
vs. INPUT POWER (UCSP)
MAX4003 toc4
INPUT POWER (dBm)
ERROR (dB)
0
-10
-40
-30
-20
-3
-2
-1
0
1
2
3
4
-4
-50
10
2.5GHz
0.9GHz
0.1GHz
1.9GHz
V
OUT
AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (
MAX)
MAX4003 toc05
INPUT POWER (dBm)
V
OUT
(V)
0
-10
-40
-30
-20
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-3
-2
-1
0
1
2
3
4
-4
-50
10
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
ERROR (dB)
V
OUT
AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
MAX4003 toc06
INPUT POWER (dBm)
V
OUT
(V)
0
-10
-40
-30
-20
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-3
-2
-1
0
1
2
3
4
-4
-50
10
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
ERROR (dB)
V
OUT
AND LOG CONFORMANCE
vs. INPUT POWER AT 0.9GHz (
MAX)
MAX4003 toc07
INPUT POWER (dBm)
V
OUT
(V)
ERROR (dB)
0
-10
-40
-30
-20
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-3
-2
-1
0
1
2
3
4
-4
-50
10
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
V
OUT
AND LOG CONFORMANCE
vs. INPUT POWER AT 0.9GHz (UCSP)
MAX4003 toc08
INPUT POWER (dBm)
V
OUT
(V)
0
-10
-40
-30
-20
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-3
-2
-1
0
1
2
3
4
-4
-50
10
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
ERROR (dB)
V
OUT
AND LOG CONFORMANCE
vs. INPUT POWER AT 1.9GHz (
MAX)
MAX4003 toc09
INPUT POWER (dBm)
V
OUT
(V)
ERROR (dB)
0
-10
-40
-30
-20
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-3
-2
-1
0
1
2
3
4
-4
-50
10
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
V
OUT
AND LOG CONFORMANCE
vs. INPUT POWER AT 1.9GHz (UCSP)
MAX4003 toc10
INPUT POWER (dBm)
V
OUT
(V)
ERROR (dB)
0
-10
-40
-30
-20
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-3
-2
-1
0
1
2
3
4
-4
-50
10
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
V
OUT
AND LOG CONFORMANCE
vs. INPUT POWER AT 2.5GHz (
MAX)
MAX4003 toc11
INPUT POWER (dBm)
V
OUT
(V)
ERROR (dB)
0
-10
-40
-30
-20
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-3
-2
-1
0
1
2
3
4
-4
-50
10
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
V
OUT
AND LOG CONFORMANCE
vs. INPUT POWER AT 2.5GHz (UCSP)
MAX4003 toc12
INPUT POWER (dBm)
V
OUT
(V)
ERROR (dB)
0
-10
-40
-30
-20
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-3
-2
-1
0
1
2
3
4
-4
-50
10
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
Typical Operating Characteristics (continued)
(V
CC
= V
SHDN
= 3.0V, C
CLPF
= 0.1F, T
A
= +25C, unless otherwise noted.)
MAX4003
100MHz to 2500MHz, 45dB RF Detector
in a UCSP
_______________________________________________________________________________________
5
LOG SLOPE vs. FREQUENCY (
MAX)
MAX4003 toc13
FREQUENCY (GHz)
LOG SLOPE (mV/dB)
2.0
1.5
1.0
0.5
25
26
27
28
29
30
31
24
0
2.5
T
A
= +25
C
T
A
= -40
C
T
A
= +85
C
LOG SLOPE vs. FREQUENCY (UCSP)
MAX4003 toc14
FREQUENCY (GHz)
LOG SLOPE (mV/dB)
2.0
1.5
1.0
0.5
25
26
27
28
29
30
31
24
0
2.5
T
A
= +25
C
T
A
= +85
C
T
A
= -40
C
LOG SLOPE vs. SUPPLY VOLTAGE
(
MAX)
MAX4003 toc15
V
CC
(V)
LOG SLOPE (mV/dB)
5.0
4.5
3.0
3.5
4.0
25
26
27
28
29
30
31
32
24
2.5
5.5
2.5GHz
1.9GHz
0.9GHz
0.1GHz
LOG SLOPE (mV/dB)
LOG SLOPE vs. SUPPLY VOLTAGE (UCSP)
5.0
4.5
4.0
3.5
3.0
2.5
5.5
MAX4003 toc16
25
26
27
28
29
30
31
32
24
V
CC
(V)
0.9GHz
2.5GHz
1.9GHz
0.1GHz
LOG INTERCEPT vs. FREQUENCY (
MAX)
MAX4003 toc17
FREQUENCY (GHz)
LOG INTERCEPT (dBm)
2.0
1.5
1.0
0.5
-58
-57
-56
-55
-54
-53
-52
-51
-50
-59
0
2.5
T
A
= +25
C
T
A
= -40
C
T
A
= +85
C
LOG INTERCEPT (dBm)
-60
-59
-58
-57
-56
-55
-61
LOG INTERCEPT vs. FREQUENCY (UCSP)
2.0
1.5
1.0
0.5
0
2.5
MAX4003 toc18
FREQUENCY (GHz)
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
LOG INTERCEPT
vs. SUPPLY VOLTAGE
(
MAX)
MAX4003 toc19
V
CC
(V)
LOG INTERCEPT (dBm)
5.0
4.5
4.0
3.5
3.0
-59
-58
-57
-56
-55
-54
-53
-52
-51
-50
-49
-60
2.5
5.5
2.5GHz
1.9GHz
0.9GHz
0.1GHz
5.0
4.5
4.0
3.5
3.0
2.5
5.5
MAX4003 toc20
-60
-59
-58
-57
-56
-55
-61
V
CC
(V)
LOG INTERCEPT (dBm)
LOG INTERCEPT
vs. SUPPLY VOLTAGE (UCSP)
1.9GHz
2.5GHz
0.1GHz
0.9GHz
RFIN INPUT IMPEDANCE
vs. FREQUENCY (
MAX)
MAX4003 toc21
FREQUENCY (GHz)
RESISTANCE (
)
REACTANCE (
)
2.0
1.5
1.0
0.5
500
1000
1500
R
X
2000
2500
0
-400
-300
-200
-100
0
-500
-600
-700
-800
0
2.5
FREQUENCY (GHz) R JX
0.1 2100 -794
0.9 500 -91
1.9 52 -35
2.5 27 -366
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