19-2288; Rev 1; 7/02
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 pack-
age (UCSP™). The device consumes 5.9mA with a 5.5V
supply, and when powered down the typical shutdown
current is 13µA.
o
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)
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 30µA (max)
o
Available in an 8-Bump UCSP and a Small 8-Pin
µMAX Package
Features
o
Complete RF-Detecting PA Controllers
MAX4000/MAX4001/MAX4002
Ordering Information
PART
MAX4000EBL-T
MAX4000EUA
MAX4001EBL-T
MAX4001EUA
MAX4002EBL-T
MAX4002EUA
TEMP RANGE
-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
—
Applications
Transmitter Power Measurement and Control
TSSI for Wireless Terminal Devices
Cellular Handsets (TDMA, CDMA, GPRS, GSM)
RSSI for Fiber Modules
Pin Configurations appear at end of data sheet.
Functional Diagram
SHDN
V
CC
OUTPUT
ENABLE
DELAY
+
gm
-
X1
OUT
DET
RFIN
10dB
DET
DET
DET
DET
CLPF
10dB
10dB
10dB
V-I
OFFSET
COMP
LOW-
NOISE
BANDGAP
SET
MAX4000
UCSP is a registered trademark of Maxim Integrated Products,
Inc.
GND
(PADDLE)
________________________________________________________________
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.
2.5GHz 45dB RF-Detecting Controllers
MAX4000/MAX4001/MAX4002
ABSOLUTE MAXIMUM RATINGS
(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 = +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
(V
CC
= 3V,
SHDN
= 1.8V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +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
BW
V
OUT
High, I
SOURCE
= 10mA
Low, I
SINK
= 350µA
From CLPF
From CLPF
V
OUT
= 0.2V to 2.6V
2.65
2.75
0.15
8
20
8
V
nV/√Hz
MHz
V/µs
V
SET
R
IN
Corresponding to central 40dB
0.35
30
16
1.45
V
MΩ
V/µs
SYMBOL
V
CC
I
CC
I
CC
V
OUT
V
H
V
L
I
SHDN
SHDN
= 3V
SHDN
= 0
-0.8
5
-0.01
V
CC
= 5.5V
SHDN
= 0.8V, V
CC
= 5.5V
SHDN
= 0.8V
1.8
0.8
20
CONDITIONS
MIN
2.7
5.9
13
100
TYP
MAX
5.5
9.3
30
UNITS
V
mA
µA
mV
V
V
µA
2
_______________________________________________________________________________________
2.5GHz 45dB RF-Detecting Controllers
ELECTRICAL CHARACTERISTICS
(V
CC
= 3V,
SHDN
= 1.8V,
f
RF
= 100MHz to 2.5GHz,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
RF Input Frequency
RF Input Voltage Range
(Note 4)
SYMBOL
f
RF
MAX4000
V
RF
MAX4001
MAX4002
MAX4000
Equivalent Power Range
(50Ω Terminated) (Note 4)
P
RF
MAX4001
MAX4002
f
RF
= 100MHz
Logarithmic Slope
V
S
f
RF
= 900MHz
f
RF
= 1900MHz
MAX4000
f
RF
= 100MHz
MAX4001
MAX4002
MAX4000
Logarithmic Intercept
P
X
f
RF
= 900MHz
MAX4001
MAX4002
MAX4000
f
RF
= 1900MHz
RF INPUT INTERFACE
DC Resistance
Inband Resistance
Inband Capacitance
R
DC
R
IB
C
IB
MAX4000, internally AC-coupled
(Note 6)
MAX4001/MAX4002, connected to V
CC
(Note 5)
2
2
0.5
kΩ
kΩ
pF
MAX4001
MAX4002
-62
-52
-47
CONDITIONS
MIN
100
-58
-48
-43
-45
-35
-30
22.5
25.5
25
29
-55
-45
-40
-57
-48
-43
-56
-45
-41
dBm
-49
-39
-34
TYP
MAX
2500
-13
-3
+2
0
+10
+15
28.5
mV/dB
dBm
dBV
UNITS
MHz
MAX4000/MAX4001/MAX4002
Note 1:
All devices are 100% production tested at T
A
= +25°C and are guaranteed by design for T
A
= -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 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
.
_______________________________________________________________________________________
3
2.5GHz 45dB RF-Detecting Controllers
MAX4000/MAX4001/MAX4002
Typical Operating Characteristics
(V
CC
= 3V,
SHDN
= V
CC
, T
A
= +25°C, unless otherwise specified.)
MAX4000
SET vs. INPUT POWER (µMAX)
MAX4000 toc01
MAX4001
SET vs. INPUT POWER (µMAX)
MAX4000 toc02
MAX4002
SET vs. INPUT POWER (µMAX)
1.6
1.4
1.2
SET (V)
1.9GHz
2.5GHz
MAX4000 toc03
1.8
1.6
1.4
1.2
SET (V)
1.0
0.8
0.6
0.4
0.2
-60
-50
-40
-30
-20
-10
0
0.1GHz
1.8
1.6
1.4
1.2
SET (V)
1.0
0.8
0.6
0.4
0.2
0.9GHz
0.1GHz
1.8
1.9GHz
2.5GHz
1.9GHz
2.5GHz
0.9GHz
0.1GHz
1.0
0.8
0.6
0.4
0.2
0.9GHz
10
-50
-40
-30
-20
-10
0
10
20
-40
-30
-20
-10
0
10
20
30
INPUT POWER (dBm)
INPUT POWER (dBm)
INPUT POWER (dBm)
MAX4000
SET vs. INPUT POWER (UCSP)
MAX4000 toc04
MAX4001
SET vs. INPUT POWER (UCSP)
MAX4000 toc05
MAX4002
SET vs. INPUT POWER (UCSP)
1.6
1.4
1.2
SET (V)
1.9GHz
1.0
0.8
0.6
0.4
0.2
0
0.1GHz
0.9GHz
2.5GHz
MAX4000 toc06
1.8
1.6
1.4
1.2
SET (V)
1.0
0.8
0.6
0.4
0.2
0
-60
-50
-40
-30
-20
-10
0
0.9GHz
2.5GHz
1.9GHz
1.8
1.6
1.4
1.2
SET (V)
1.9GHz
1.0
0.8
0.6
0.4
0.2
0
2.5GHz
0.1GHz
1.8
0.1GHz
0.9GHz
10
-50
-40
-30
-20
-10
0
10
20
-40
-30
-20
-10
0
10
20
30
INPUT POWER (dBm)
INPUT POWER (dBm)
INPUT POWER (dBm)
MAX4000 LOG CONFORMANCE
vs. INPUT POWER (µMAX)
MAX4000 toc07
MAX4001 LOG CONFORMANCE
vs. INPUT POWER (µMAX)
MAX4000 toc08
MAX4002 LOG CONFORMANCE
vs. INPUT POWER (µMAX)
3
2
ERROR (dB)
2.5GHz
0.1GHz
MAX4000 toc09
4
3
2
1.9GHz
ERROR (dB)
1
0
-1
0.9GHz
-2
-3
-4
-50
-40
-30
-20
-10
0
0.1GHz
4
2.5GHz
3
2
ERROR (dB)
1
0
0.9GHz
-1
-2
-3
-4
-40
-30
-20
-10
0
10
1.9GHz
0.1GHz
4
2.5GHz
1
0
-1
1.9GHz
-2
-3
-4
0.9GHz
10
20
-35
-25
-15
-5
5
15
25
INPUT POWER (dBm)
INPUT POWER (dBm)
INPUT POWER (dBm)
4
_______________________________________________________________________________________
2.5GHz 45dB RF-Detecting Controllers
Typical Operating Characteristics (continued)
(V
CC
= 3V,
SHDN
= V
CC
, T
A
= +25°C, unless otherwise specified.)
MAX4000 LOG CONFORMANCE
vs. INPUT POWER (UCSP)
MAX4000 toc10
MAX4000/MAX4001/MAX4002
MAX4001 LOG CONFORMANCE
vs. INPUT POWER (UCSP)
MAX4000 toc11
MAX4002 LOG CONFORMANCE
vs. INPUT POWER (UCSP)
3
2.5GHz
2
ERROR (dB)
1
0
-1
-2
1.9GHz
-3
-4
-35
-25
-15
-5
5
15
25
0.9GHz
0.1GHz
MAX4000 toc12
MAX4000 toc15
4
3
2
ERROR (dB)
1
0
-1
-2
-3
-4
-50
-40
-30
-20
-10
0
1.9GHz
0.1GHz
0.9GHz
2.5GHz
4
3
2
ERROR (dB)
1
0
-1
-2
-3
-4
-40
-30
-20
-10
0
10
1.9GHz
2.5GHz
0.1GHz
0.9GHz
4
10
20
INPUT POWER (dBm)
INPUT POWER (dBm)
INPUT POWER (dBm)
MAX4000 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (µMAX)
1.8
1.6
1.4
1.2
SET (V)
1.0
0.8
0.6
0.4
0.2
-50
-40
-30
-20
-10
0
INPUT POWER (dBm)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
MAX4000 toc13
MAX4001 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (µMAX)
4
3
2
1
0
-1
-2
-3
ERROR (dB)
SET (V)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-40
-30
-20
-10
0
10
INPUT POWER (dBm)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
-2
-3
-4
20
MAX4000 toc14
MAX4002 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (µMAX)
4
3
2
ERROR (dB)
SET (V)
1
0
-1
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-35
-25
-15
-5
5
15
INPUT POWER (dBm)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
-2
-3
-4
25
4
3
2
ERROR (dB)
ERROR (dB)
1
0
-1
-4
10
MAX4000 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
1.8
1.6
1.4
1.2
SET (V)
1.0
0.8
0.6
0.4
0.2
-50
-40
-30
-20
-10
0
INPUT POWER (dBm)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
MAX4000 toc16
MAX4001 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
4
3
2
SET (V)
1
0
-1
-2
-3
ERROR (dB)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-40
-30
-20
-10
0
10
INPUT POWER (dBm)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
-2
-3
-4
20
MAX4000 toc17
MAX4002 SET AND LOG CONFORMANCE
vs. INPUT POWER AT 0.1GHz (UCSP)
4
3
2
1
0
-1
ERROR (dB)
SET (V)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-35
-25
-15
-5
5
15
INPUT POWER (dBm)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
MAX4000 toc18
4
3
2
1
0
-1
-2
-3
-4
10
-4
25
_______________________________________________________________________________________
5
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