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 -40C to +85C.
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 2k
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 5s to ensure glitch-
free controller output.
The MAX4000/MAX4001/MAX4002 family is available in
an 8-pin MAX package and an 8-bump chip-scale pack-
age (UCSPTM). The device consumes 5.9mA with a 5.5V
supply, and when powered down the typical shutdown
current is 13A.
Applications
Transmitter Power Measurement and Control
TSSI for Wireless Terminal Devices
Cellular Handsets (TDMA, CDMA, GPRS, GSM)
RSSI for Fiber Modules
UCSP is a registered trademark of Maxim Integrated Products,
Inc.
Features
o Complete RF-Detecting PA Controllers
o Variety of Input Ranges
MAX4000: -58dBV to -13dBV
(-45dBm to 0dBm in 50
)
MAX4001: -48dBV to -3dBV
(-35dBm to +10dBm in 50
)
MAX4002: -43dBV to +2dBV
(-30dBm to +15dBm in 50
)
o Frequency Range from 100MHz to 2.5GHz
o Temperature Stable Linear-in-dB Response
o Fast Response: 70ns 10dB Step
o 10mA Output Sourcing Capability
o Low Power: 17mW at 3V (typ)
o Shutdown Current 30A (max)
o Available in an 8-Bump UCSP and a Small 8-Pin
MAX Package
MAX4000/MAX4001/MAX4002
2.5GHz 45dB RF-Detecting Controllers
________________________________________________________________ Maxim Integrated Products
1
19-2288; Rev 1; 7/02
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.
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX4000EBL-T
-40
C to +85C
8 UCSP-8
ABF
MAX4000EUA
-40
C to +85C
8 MAX
--
MAX4001EBL-T
-40
C to +85C
8 UCSP-8
ABE
MAX4001EUA
-40
C to +85C
8 MAX
--
MAX4002EBL-T
-40
C to +85C
8 UCSP-8
ABD
MAX4002EUA
-40
C to +85C
8 MAX
--
Functional Diagram
10dB
DET
10dB
10dB
10dB
DET
DET
DET
DET
OFFSET
COMP
LOW-
NOISE
BANDGAP
OUTPUT
ENABLE
DELAY
GND
(PADDLE)
gm
+
-
X1
V-I
RFIN
V
CC
SHDN
OUT
CLPF
SET
MAX4000
Pin Configurations appear at end of data sheet.
MAX4000/MAX4001/MAX4002
2.5GHz 45dB RF-Detecting Controllers
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= 3V, SHDN = 1.8V, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
CC
2.7
5.5
V
Supply Current
I
CC
V
CC
= 5.5V
5.9
9.3
mA
Shutdown Supply Current
I
CC
SHDN = 0.8V, V
CC
= 5.5V
13
30
A
Shutdown Output Voltage
V
OUT
SHDN = 0.8V
100
mV
Logic-High Threshold
V
H
1.8
V
Logic-Low Threshold
V
L
0.8
V
SHDN = 3V
5
20
SHDN Input Current
I
SHDN
SHDN = 0
-0.8
-0.01
A
SET-POINT INPUT
Voltage Range (Note 2)
V
SET
Corresponding to central 40dB
0.35
1.45
V
Input Resistance
R
IN
30
M
Slew Rate (Note 3)
16
V/s
MAIN OUTPUT
High, I
SOURCE
= 10mA
2.65
2.75
Voltage Range
V
OUT
Low, I
SINK
= 350A
0.15
V
Output-Referred Noise
From CLPF
8
nV/
Hz
Small-Signal Bandwidth
BW
From CLPF
20
MHz
Slew Rate
V
OUT
= 0.2V to 2.6V
8
V/s
(Voltages Referenced to GND)
V
CC
...........................................................................-0.3V to +6V
OUT, SET, SHDN, CLPF .............................-0.3V to (V
CC
+ 0.3V)
RFIN
MAX4000 ......................................................................+6dBm
MAX4001 ....................................................................+16dBm
MAX4002 ....................................................................+19dBm
Equivalent Voltage
MAX4000 ..................................................................0.45V
RMS
MAX4001 ....................................................................1.4V
RMS
MAX4002 ....................................................................2.0V
RMS
OUT Short Circuit to GND ..........................................Continuous
Continuous Power Dissipation (TA = +70C)
8-Bump UCSP (derate 4.7mW/C above +70C).........379mW
8-Pin MAX (derate 4.5mW/C above +70C) .............362mW
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering , 10s) ................................+300C
MAX4000/MAX4001/MAX4002
2.5GHz 45dB RF-Detecting Controllers
_______________________________________________________________________________________
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 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 g
m
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 V
CC
.
ELECTRICAL CHARACTERISTICS
(V
CC
= 3V, SHDN = 1.8V, f
RF
= 100MHz to 2.5GHz, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RF Input Frequency
f
RF
100
2500
MHz
MAX4000
-58
-13
MAX4001
-48
-3
RF Input Voltage Range
(Note 4)
V
RF
MAX4002
-43
+2
dBV
MAX4000
-45
0
MAX4001
-35
+10
Equivalent Power Range
(50
Terminated) (Note 4)
P
RF
MAX4002
-30
+15
dBm
f
RF
= 100MHz
22.5
25.5
28.5
f
RF
= 900MHz
25
Logarithmic Slope
V
S
f
RF
= 1900MHz
29
mV/dB
MAX4000
-62
-55
-49
MAX4001
-52
-45
-39
f
RF
= 100MHz
MAX4002
-47
-40
-34
MAX4000
-57
MAX4001
-48
f
RF
= 900MHz
MAX4002
-43
MAX4000
-56
MAX4001
-45
Logarithmic Intercept
P
X
f
RF
= 1900MHz
MAX4002
-41
dBm
RF INPUT INTERFACE
DC Resistance
R
DC
MAX4001/MAX4002, connected to V
CC
(Note 5)
2
k
Inband Resistance
R
IB
2
k
Inband Capacitance
C
IB
MAX4000, internally AC-coupled
(Note 6)
0.5
pF
MAX4000/MAX4001/MAX4002
2.5GHz 45dB RF-Detecting Controllers
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= 3V, SHDN = V
CC
, T
A
= +25C, unless otherwise specified.)
MAX4001 LOG CONFORMANCE
vs. INPUT POWER (
MAX)
MAX4000 toc08
INPUT POWER (dBm)
ERROR (dB)
10
0
-30
-20
-10
-3
-2
-1
0
1
2
3
4
-4
-40
20
2.5GHz
1.9GHz
0.9GHz
0.1GHz
MAX4002 LOG CONFORMANCE
vs. INPUT POWER (
MAX)
MAX4000 toc09
INPUT POWER (dBm)
ERROR (dB)
15
5
-25
-15
-5
-3
-2
-1
0
1
2
3
4
-4
-35
25
2.5GHz
1.9GHz
0.9GHz
0.1GHz
MAX4000 LOG CONFORMANCE
vs. INPUT POWER (
MAX)
MAX4000 toc07
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
MAX4002
SET vs. INPUT POWER (UCSP)
MAX4000 toc06
INPUT POWER (dBm)
SET (V)
20
10
-10
0
-20
-30
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
-40
30
2.5GHz
1.9GHz
0.9GHz
0.1GHz
MAX4001
SET vs. INPUT POWER (UCSP)
INPUT POWER (dBm)
SET (V)
10
0
-20
-10
-30
-40
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
-50
20
2.5GHz
1.9GHz
0.9GHz
0.1GHz
MAX4000 toc05
MAX4000
SET vs. INPUT POWER (UCSP)
MAX4000 toc04
INPUT POWER (dBm)
SET (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
0
-60
10
2.5GHz
1.9GHz
0.9GHz
0.1GHz
MAX4002
SET vs. INPUT POWER (
MAX)
MAX4000 toc03
INPUT POWER (dBm)
SET (V)
20
10
-30
-20
-10
0
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-40
30
2.5GHz
1.9GHz
0.9GHz
0.1GHz
MAX4001
SET vs. INPUT POWER (
MAX)
MAX4000 toc02
INPUT POWER (dBm)
SET (V)
10
0
-40
-30
-20
-10
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
-50
20
2.5GHz
1.9GHz
0.9GHz
0.1GHz
MAX4000
SET vs. INPUT POWER (
MAX)
MAX4000 toc01
INPUT POWER (dBm)
SET (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
MAX4000/MAX4001/MAX4002
2.5GHz 45dB RF-Detecting Controllers
_______________________________________________________________________________________
5
Typical Operating Characteristics (continued)
(V
CC
= 3V, SHDN = V
CC
, T
A
= +25C, unless otherwise specified.)
MAX4002 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
MAX4000 toc18
INPUT POWER (dBm)
SET (V)
15
5
-25
-15
-5
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
-35
25
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
ERROR (dB)
MAX4001 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
MAX4000 toc17
INPUT POWER (dBm)
SET (V)
10
0
-30
-20
-10
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
-40
20
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
ERROR (dB)
MAX4000 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
MAX4000 toc16
INPUT POWER (dBm)
SET (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)
MAX4002 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (
MAX)
MAX4000 toc15
INPUT POWER (dBm)
SET (V)
ERROR (dB)
15
5
-25
-15
-5
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
-35
25
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
MAX4001 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (
MAX)
MAX4000 toc14
INPUT POWER (dBm)
SET (V)
10
0
-30
-20
-10
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
-40
20
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
ERROR (dB)
MAX4000 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (
MAX)
MAX4000 toc13
INPUT POWER (dBm)
SET (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)
MAX4002 LOG CONFORMANCE
vs. INPUT POWER (UCSP)
MAX4000 toc12
INPUT POWER (dBm)
ERROR (dB)
15
5
-25
-15
-5
-3
-2
-1
0
1
2
3
4
-4
-35
25
2.5GHz
0.9GHz
0.1GHz
1.9GHz
MAX4001 LOG CONFORMANCE
vs. INPUT POWER (UCSP)
MAX4000 toc11
INPUT POWER (dBm)
ERROR (dB)
10
0
-30
-20
-10
-3
-2
-1
0
1
2
3
4
-4
-40
20
2.5GHz
0.9GHz
0.1GHz
1.9GHz
MAX4000 LOG CONFORMANCE
vs. INPUT POWER (UCSP)
MAX4000 toc10
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
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