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19-2620; Rev 1; 3/03
EVAALVUAAILTAIOBNLEKIT
100MHz to 2500MHz, 45dB RF Detector
in a UCSP
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 -40°C to +85°C.
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 2kresistance.
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 5µs to ensure
glitchless controller output.
The MAX4003 is available in an 8-bump chip-scale pack-
age (UCSP™), an 8-pin µMAX package, and an 8-pin thin
QFN package. The device consumes 5.9mA with a 3.0V
supply and only 13µA 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
UCSP is a trademark of Maxim Integrated Products, Inc.
Features
Complete RF Detector
Frequency Range from 100MHz to 2500MHz
Input Range of -58dBV to -13dBV
(-45dBm to 0dBm into 50)
Fast Response: 70ns in 10dB Steps
Low-Current Consumption: 5.9mA at VCC = 3.0V
13µA (typ) Shutdown Current
Available in 8-Bump UCSP or 8-Pin µMAX and
Thin QFN Packages
Ordering Information
PART
MAX4003EBL-T
MAX4003EUA
MAX4003ETA-T
TEMP RANGE
PIN/BUMP-
PACKAGE
TOP
MARK
-40°C to +85°C 8 UCSP-8
ABV
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 Thin QFN-EP ADG
Pin Configurations
TOP VIEW
(BUMPS ON BOTTOM)
12
3
TOP VIEW
A RFIN
SHDN
GND
B VCC MAX4003 CLPF
RFIN 1
SHDN 2
GND 3
CLPF 4
MAX4003
8 VCC
7 OUT
6 N.C.
5 GND
C VCC OUT GND
µMAX
UCSP
Pin Configurations continued at end of data sheet.
Functional Diagram
SHDN
VCC
RFIN
GND
OUTPUT
ENABLE
DELAY
+
gm 1X
DET DET DET DET DET -
10dB 10dB 10dB 10dB
OFFSET
COMP
LOW-
NOISE
BANDGAP
V-I
MAX4003
OUT
CLPF
________________________________________________________________ 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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100MHz to 2500MHz, 45dB RF Detector
in a UCSP
ABSOLUTE MAXIMUM RATINGS
VCC to GND .........................................................-0.3V to +5.25V
SHDN, CLPF to GND..................................-0.3V to (VCC + 0.3V)
RFIN..................................................................................+6dBm
OUT Short Circuit to GND.......................................................10s
Continuous Power Dissipation (TA = +70°C)
8-Bump UCSP (derate 4.7mW/°C above +70°C).........379mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
8-Pin Thin QFN (derate 24.4mW/°C above +70°C) ...1951mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°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
(VCC = 3.0V, V SHDN = VCC, CCLPF = 0.1µF, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
Supply Current
Shutdown Input Current
Logic High Threshold Voltage
Logic Low Threshold Voltage
DETECTOR OUTPUT
Voltage Range
Output Voltage in Shutdown
Output-Referred Noise
Small-Signal Bandwidth
Slew Rate
SYMBOL
VCC
ICC
I SHDN
VIH
VIL
CONDITIONS
VCC = 5.0V
V SHDN = 3.0V
V SHDN = 0V
V SHDN = 1.8V
V SHDN = 0.8V
VOUT
VOUT
BW
RFIN = 0dBm
RFIN = -45dBm
V SHDN = 0V
fo =150kHz
CCLPF = 150pF
VOUT = 0.36V to 1.45V, CCLPF = 150pF
MIN TYP MAX UNITS
2.7 5.0 V
5.9 10
mA
13 30 µA
5
-0.01
20
±5
µA
1.8 V
0.8 V
1.45
V
0.36
1 mV
8 nV/Hz
8 MHz
5 V/µs
2 _______________________________________________________________________________________

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100MHz to 2500MHz, 45dB RF Detector
in a UCSP
AC ELECTRICAL CHARACTERISTICS
(VCC = 3.0V, VSHDN = VCC, CCLPF = 0.1µF, fRF = 100MHz to 2500MHz, TA = -40°C to +85°C. Typical values are at TA = +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
RF Input Frequency Range
RF Input Voltage Range
Equivalent RF Input Power Range
Logarithmic Slope
Logarithmic Intercept
RFIN Input Impedance
SYMBOL
fRF
VRF
PRF
PX
RIN
CIN
CONDITIONS
(Note 2)
With 50termination (Note 2)
fRF = 100MHz, TA = +25°C
fRF = 100MHz
fRF = 900MHz
fRF = 1900MHz
fRF = 100MHz, TA = +25°C
fRF = 100MHz
fRF = 900MHz
fRF = 1900MHz
MIN
100
-58
-45
22.8
22.5
-62.3
-64
TYP
25.5
25.0
29.0
-57
-57
-56
2
0.5
MAX
2500
-13
0
28.2
28.5
UNITS
MHz
dBV
dBm
mV/dB
-51.7
-50
dBm
k
pF
Note 1: All devices are 100% production tested at TA = +25°C and are guaranteed by design for TA = -40°C to +85°C as specified.
All production AC tests are done at 100MHz.
Note 2: Typical minimum and maximum range of the detector.
Typical Operating Characteristics
(VCC = V SHDN = 3.0V, CCLPF = 0.1µF, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. INPUT POWER (µMAX)
1.8
1.6 1.9GHz
1.4 2.5GHz
1.2
0.1GHz
1.0
0.8 0.9GHz
0.6
0.4
0.2
-60 -50 -40 -30 -20 -10
INPUT POWER (dBm)
0
10
OUTPUT VOLTAGE
vs. INPUT POWER (UCSP)
1.8
1.6 2.5GHz
1.4 1.9GHz
1.2
1.0
0.9GHz
0.8
0.1GHz
0.6
0.4
0.2
-60 -50 -40 -30 -20 -10 0 10
INPUT POWER (dBm)
4
3
2
1
0
-1
-2
-3
-4
-50
LOG CONFORMANCE
vs. INPUT POWER (µMAX)
2.5GHz
1.9GHz
0.9GHz 0.1GHz
-40 -30 -20 -10
INPUT POWER (dBm)
0
10
_______________________________________________________________________________________ 3

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100MHz to 2500MHz, 45dB RF Detector
in a UCSP
Typical Operating Characteristics (continued)
(VCC = V SHDN = 3.0V, CCLPF = 0.1µF, TA = +25°C, unless otherwise noted.)
LOG CONFORMANCE
vs. INPUT POWER (UCSP)
4
3
2
1
0.9GHz
0
2.5GHz
-1
-2 1.9GHz
0.1GHz
-3
-4
-50
-40 -30 -20 -10
INPUT POWER (dBm)
0
10
VOUT AND LOG CONFORMANCE
vs. INPUT POWER AT 0.9GHz (µMAX)
1.8 4MAX4003 toc07
1.6 3
1.4 2
1.2 1
1.0 0
0.8
TA = +85°C
-1
TA = +25°C
0.6 -2
TA = -40°C
0.4 -3
0.2
-50
-40 -30 -20 -10
INPUT POWER (dBm)
0
-4
10
VOUT AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (µMAX)
1.8 4MAX4003 toc05
1.6 3
1.4 2
1.2 1
1.0 0
0.8
TA = +85°C
-1
TA = +25°C
0.6
TA = -40°C
-2
0.4 -3
0.2
-50
-40 -30 -20 -10
INPUT POWER (dBm)
0
-4
10
VOUT AND LOG CONFORMANCE
vs. INPUT POWER AT 0.9GHz (UCSP)
1.8 4MAX4003 toc08
1.6 3
1.4 2
1.2 1
1.0 0
0.8
TA = +85°C
-1
TA = -40°C
0.6 -2
TA = +25°C
0.4 -3
0.2
-50
-40 -30 -20 -10
INPUT POWER (dBm)
0
-4
10
VOUT AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
1.8 4MAX4003 toc06
1.6 3
1.4 2
1.2 1
1.0 0
0.8
TA = +85°C
-1
TA = +25°C
0.6
TA = -40°C
-2
0.4 -3
0.2
-50
-40 -30 -20 -10
INPUT POWER (dBm)
0
-4
10
VOUT AND LOG CONFORMANCE
vs. INPUT POWER AT 1.9GHz (µMAX)
1.8 4MAX4003 toc09
1.6 TA = +85°C
TA = +25°C
1.4
TA = -40°C
3
2
1.2 1
1.0 0
TA = +85°C
0.8 -1
TA = +25°C
0.6 -2
TA = -40°C
0.4 -3
0.2
-50
-40 -30 -20 -10
INPUT POWER (dBm)
0
-4
10
VOUT AND LOG CONFORMANCE
vs. INPUT POWER AT 1.9GHz (UCSP)
1.8 4MAX4003 toc10
1.6
TA = +85°C
3
TA = +25°C
1.4
2
TA = -40°C
1.2 1
1.0 0
TA = +85°C
0.8 -1
TA = +25°C
0.6 -2
TA = -40°C
0.4 -3
0.2
-50
-40 -30 -20 -10
INPUT POWER (dBm)
0
-4
10
VOUT AND LOG CONFORMANCE
vs. INPUT POWER AT 2.5GHz (µMAX)
1.8 4MAX4003 toc11
1.6
TA = +85°C
3
TA = +25°C
1.4 2
1.2 TA = -40°C
1
1.0 0
0.8
0.6
0.4
0.2
-50
TA = +85°C
TA = +25°C
TA = -40°C
-40 -30 -20 -10
INPUT POWER (dBm)
0
-1
-2
-3
-4
10
VOUT AND LOG CONFORMANCE
vs. INPUT POWER AT 2.5GHz (UCSP)
1.8 4MAX4003 toc12
1.6
TA = +85°C
3
TA = +25°C
1.4
2
TA = -40°C
1.2 1
1.0 0
0.8
0.6
0.4
0.2
-50
TA = +85°C
TA = +25°C
TA = -40°C
-40 -30 -20 -10
INPUT POWER (dBm)
0
-1
-2
-3
-4
10
4 _______________________________________________________________________________________

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100MHz to 2500MHz, 45dB RF Detector
in a UCSP
Typical Operating Characteristics (continued)
(VCC = V SHDN = 3.0V, CCLPF = 0.1µF, TA = +25°C, unless otherwise noted.)
LOG SLOPE vs. FREQUENCY (µMAX)
31
30
TA = +85°C
29
TA = +25°C
28
TA = -40°C
27
26
25
24
0
0.5 1.0 1.5 2.0
FREQUENCY (GHz)
2.5
LOG SLOPE vs. FREQUENCY (UCSP)
31
30
29
TA = +85°C
28
27 TA = +25°C
26
25
24
0
TA = -40°C
0.5 1.0 1.5 2.0
FREQUENCY (GHz)
2.5
LOG SLOPE vs. SUPPLY VOLTAGE (µMAX)
32
2.5GHz
31
30
29
28 1.9GHz
27
26 0.9GHz
25
0.1GHz
24
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VCC (V)
LOG SLOPE vs. SUPPLY VOLTAGE (UCSP)
32
31 2.5GHz
30
29
28 1.9GHz
27 0.1GHz
26
25 0.9GHz
24
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VCC (V)
-49
-50
-51
-52
-53
-54
-55
-56
-57
-58
-59
-60
2.5
LOG INTERCEPT
vs. SUPPLY VOLTAGE (µMAX)
2.5GHz
0.1GHz
1.9GHz
0.9GHz
3.0 3.5 4.0 4.5 5.0
VCC (V)
5.5
LOG INTERCEPT vs. FREQUENCY (µMAX)
-50
-51
-52
-53 TA = +85°C
-54 TA = +25°C
-55
-56 TA = -40°C
-57
-58
-59
0
0.5 1.0 1.5 2.0
FREQUENCY (GHz)
2.5
LOG INTERCEPT
vs. SUPPLY VOLTAGE (UCSP)
-55
-56 2.5GHz
-57
-58 0.1GHz
-59 0.9GHz
-60 1.9GHz
-61
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VCC (V)
LOG INTERCEPT vs. FREQUENCY (UCSP)
-55
-56
-57
-58
-59
-60
-61
0
TA = +25°C
TA = +85°C
TA = -40°C
0.5 1.0 1.5 2.0
FREQUENCY (GHz)
2.5
2500
2000
1500
1000
500
0
0
RFIN INPUT IMPEDANCE
vs. FREQUENCY (µMAX)
0MAX4003 toc21
X -100
FREQUENCY (GHz) R
0.1 2100
0.9 500
1.9 52
2.5 27
JX
-794
-91
-35
-366
-200
-300
-400
-500
-600
R -700
0.5 1.0 1.5 2.0
FREQUENCY (GHz)
-800
2.5
_______________________________________________________________________________________ 5