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19-2288; Rev 2; 12/07
2.5GHz 45dB RF-Detecting Controllers
General Description
The MAX4000/MAX4001/MAX4002 low-cost, low-power
logarithmic amplifiers are designed to control RF power
amplifiers (PA) operating in the 0.1GHz to 2.5GHz fre-
quency range. A typical dynamic range of 45dB makes
this family of log amps useful in a variety of wireless appli-
cations including cellular handset PA control, transmitter
power measurement, and RSSI for terminal devices.
Logarithmic amplifiers provide much wider measurement
range and superior accuracy to controllers based on
diode detectors. Excellent temperature stability is
achieved over the full operating range of -40°C to +85°C.
The choice of three different input voltage ranges elimi-
nates the need for external attenuators, thus simplifying
PA control-loop design. The logarithmic amplifier is a volt-
age-measuring device with a typical signal range of
-58dBV to -13dBV for the MAX4000, -48dBV to -3dBV for
the MAX4001, and -43dBV to +2dBV for the MAX4002.
The input signal for the MAX4000 is internally AC-coupled
using an on-chip 5pF capacitor in series with a 2kΩ input
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
MAX4001/MAX4002 require an external coupling capaci-
tor in series with the RF input port. These PA controllers
feature a power-on delay when coming out of shutdown,
holding OUT low for approximately 5µs to ensure glitch-
free controller output.
The MAX4000/MAX4001/MAX4002 family is available in
an 8-pin µMAX® package and an 8-bump chip-scale
package (UCSP™). The device consumes 5.9mA with a
5.5V supply, and when powered down the typical shut-
down current is 13µA.
Applications
Transmitter Power Measurement and Control
TSSI for Wireless Terminal Devices
Cellular Handsets (TDMA, CDMA, GPRS, GSM)
RSSI for Fiber Modules
µMAX is a registered trademark of Maxim Integrated Products, Inc.
UCSP is a trademark of Maxim Integrated Products, Inc.
Features
Complete RF-Detecting PA Controllers
Variety of Input Ranges
MAX4000: -58dBV to -13dBV
(-45dBm to 0dBm in 50Ω)
MAX4001: -48dBV to -3dBV
(-35dBm to +10dBm in 50Ω)
MAX4002: -43dBV to +2dBV
(-30dBm to +15dBm in 50Ω)
Frequency Range from 100MHz to 2.5GHz
Temperature Stable Linear-in-dB Response
Fast Response: 70ns 10dB Step
10mA Output Sourcing Capability
Low Power: 17mW at 3V (typ)
Shutdown Current 30µA (max)
Available in an 8-Bump UCSP and a Small 8-Pin
µMAX Package
Ordering Information
PART
TEMP RANGE
MAX4000EBL-T
MAX4000EUA
MAX4001EBL-T
MAX4001EUA
MAX4002EBL-T
MAX4002EUA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 UCSP-8
8 µMAX
8 UCSP-8
8 µMAX
8 UCSP-8
8 µMAX
TOP
MARK
ABF
ABE
ABD
Pin Configurations appear at end of data sheet.
Functional Diagram
SHDN
VCC
RFIN
GND
(PADDLE)
OUTPUT
ENABLE
DELAY
-
gm X1
DET DET DET DET DET +
10dB 10dB 10dB 10dB
OFFSET
COMP
LOW-
NOISE
BANDGAP
V-I
MAX4000
OUT
CLPF
SET
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

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2.5GHz 45dB RF-Detecting Controllers
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND)
VCC ...........................................................................-0.3V to +6V
OUT, SET, SHDN, CLPF .............................-0.3V to (VCC + 0.3V)
RFIN
MAX4000 ......................................................................+6dBm
MAX4001 ....................................................................+16dBm
MAX4002 ....................................................................+19dBm
Equivalent Voltage
MAX4000 ..................................................................0.45VRMS
MAX4001 ....................................................................1.4VRMS
MAX4002 ....................................................................2.0VRMS
OUT Short Circuit to GND ..........................................Continuous
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
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.
ELECTRICAL CHARACTERISTICS
(VCC = 3V, SHDN = 1.8V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage
Supply Current
Shutdown Supply Current
Shutdown Output Voltage
Logic-High Threshold
Logic-Low Threshold
SHDN Input Current
SET-POINT INPUT
Voltage Range (Note 2)
Input Resistance
Slew Rate (Note 3)
MAIN OUTPUT
Voltage Range
Output-Referred Noise
Small-Signal Bandwidth
Slew Rate
SYMBOL
VCC
ICC
ICC
VOUT
VH
VL
ISHDN
CONDITIONS
VCC = 5.5V
SHDN = 0.8V, VCC = 5.5V
SHDN = 0.8V
SHDN = 3V
SHDN = 0
VSET
RIN
Corresponding to central 40dB
VOUT
BW
High, ISOURCE = 10mA
Low, ISINK = 350µA
From CLPF
From CLPF
VOUT = 0.2V to 2.6V
MIN TYP MAX
2.7 5.5
5.9 9.3
13 30
100
1.8
0.8
5 20
-0.8 -0.01
0.35 1.45
30
16
2.65 2.75
0.15
8
20
8
UNITS
V
mA
µA
mV
V
V
µA
V
MΩ
V/µs
V
nV/Hz
MHz
V/µs
2 _______________________________________________________________________________________

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2.5GHz 45dB RF-Detecting Controllers
ELECTRICAL CHARACTERISTICS
(VCC = 3V, SHDN = 1.8V, fRF = 100MHz to 2.5GHz, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
RF Input Frequency
RF Input Voltage Range
(Note 4)
fRF
MAX4000
VRF MAX4001
MAX4002
100 2500 MHz
-58 -13
-48 -3 dBV
-43 +2
Equivalent Power Range
(50Ω Terminated) (Note 4)
MAX4000
PRF MAX4001
MAX4002
-45 0
-35 +10 dBm
-30 +15
Logarithmic Slope
fRF = 100MHz
VS fRF = 900MHz
fRF = 1900MHz
MAX4000
22.5 25.5 28.5
25 mV/dB
29
-62 -55 -49
fRF = 100MHz
MAX4001
MAX4002
-52 -45 -39
-47 -40 -34
Logarithmic Intercept
PX fRF = 900MHz
MAX4000
MAX4001
MAX4002
-57
-48 dBm
-43
fRF = 1900MHz
MAX4000
MAX4001
MAX4002
-56
-45
-41
RF INPUT INTERFACE
DC Resistance
RDC
MAX4001/MAX4002, connected to VCC
(Note 5)
2 kΩ
Inband Resistance
RIB
2 kΩ
Inband Capacitance
CIB
MAX4000, internally AC-coupled
(Note 6)
0.5 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 testing is done at 100MHz.
Note 2: Typical value only, set-point input voltage range determined by logarithmic slope and logarithmic intercept.
Note 3: Set-point slew rate is the rate at which the reference level voltage, applied to the inverting input of the gm stage, responds to
a voltage step at the SET pin (see Figure 1).
Note 4: Typical min/max range for detector.
Note 5: MAX4000 internally AC-coupled.
Note 6: MAX4001/MAX4002 are internally resistive-coupled to VCC.
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2.5GHz 45dB RF-Detecting Controllers
Typical Operating Characteristics
(VCC = 3V, SHDN = VCC, TA = +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem-
peratures.)
MAX4000
SET 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 0 10
INPUT POWER (dBm)
MAX4001
SET vs. INPUT POWER (μMAX)
1.8
1.6 1.9GHz
1.4 2.5GHz
1.2
0.9GHz
1.0
0.1GHz
0.8
0.6
0.4
0.2
-50 -40 -30 -20 -10 0
INPUT POWER (dBm)
10 20
MAX4002
SET vs. INPUT POWER (μMAX)
1.8
1.6 1.9GHz
1.4 2.5GHz
1.2
0.9GHz
1.0
0.1GHz
0.8
0.6
0.4
0.2
-40 -30 -20 -10 0 10 20 30
INPUT POWER (dBm)
MAX4000
SET vs. INPUT POWER (UCSP)
1.8
1.6
2.5GHz
1.4
1.9GHz
1.2
0.1GHz
1.0
0.8
0.9GHz
0.6
0.4
0.2
0
-60 -50 -40 -30 -20 -10 0 10
INPUT POWER (dBm)
MAX4000 LOG CONFORMANCE
vs. INPUT POWER (μMAX)
4
3
2.5GHz
2
1.9GHz
1
0
-1
0.9GHz 0.1GHz
-2
-3
-4
-50
-40 -30 -20 -10
INPUT POWER (dBm)
0
10
MAX4001
SET vs. INPUT POWER (UCSP)
1.8
1.6
1.4 0.1GHz
1.2
1.9GHz
1.0 0.9GHz
0.8
0.6
2.5GHz
0.4
0.2
0
-50 -40 -30 -20 -10 0
INPUT POWER (dBm)
10
20
MAX4001 LOG CONFORMANCE
vs. INPUT POWER (μMAX)
4
2.5GHz
3
0.1GHz
2
1 1.9GHz
0
0.9GHz
-1
-2
-3
-4
-40
-30 -20 -10 0
INPUT POWER (dBm)
10
20
MAX4002
SET vs. INPUT POWER (UCSP)
1.8
1.6 2.5GHz
1.4
1.2
1.9GHz
1.0
0.9GHz
0.8
0.6 0.1GHz
0.4
0.2
0
-40 -30 -20 -10 0 10 20 30
INPUT POWER (dBm)
MAX4002 LOG CONFORMANCE
vs. INPUT POWER (μMAX)
4
2.5GHz
3
0.1GHz
2
1
0
-1
1.9GHz
-2
0.9GHz
-3
-4
-35
-25 -15 -5 5
INPUT POWER (dBm)
15
25
4 _______________________________________________________________________________________

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2.5GHz 45dB RF-Detecting Controllers
Typical Operating Characteristics (continued)
(VCC = 3V, SHDN = VCC, TA = +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem-
peratures.)
MAX4000 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
MAX4001 LOG CONFORMANCE
vs. INPUT POWER (UCSP)
4
3
0.1GHz
2 0.9GHz
1
0
-1 2.5GHz
-2 1.9GHz
-3
-4
-40
-30 -20 -10 0
INPUT POWER (dBm)
10
20
MAX4002 LOG CONFORMANCE
vs. INPUT POWER (UCSP)
4
3
2.5GHz
2 0.1GHz
1
0
-1 0.9GHz
-2
1.9GHz
-3
-4
-35
-25 -15 -5 5
INPUT POWER (dBm)
15
25
MAX4000 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (μMAX)
1.8 4MAX4000 toc13
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
MAX4000 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
1.8 4MAX4000 toc16
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
MAX4001 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (μMAX)
1.8 4MAX4000 toc14
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
-40
-30 -20 -10 0
INPUT POWER (dBm)
10
-4
20
MAX4001 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
1.8 4MAX4000 toc17
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
-40
-30 -20 -10 0
INPUT POWER (dBm)
10
-4
20
MAX4002 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (μMAX)
1.8 4MAX4000 toc15
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
-35
-25 -15 -5 5
INPUT POWER (dBm)
15
-4
25
MAX4002 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
1.8 4MAX4000 toc18
1.6 3
1.4 2
1.2 1
1.0 0
0.8
TA = +85°C
-1
0.6
TA = +25°C
-2
0.4
TA = -40°C
-3
0.2
-35
-25 -15 -5 5
INPUT POWER (dBm)
15
-4
25
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