General Description
The MAX2014 complete multistage logarithmic amplifier is
designed to accurately convert radio-frequency (RF) signal power in the 50MHz to 1000MHz frequency range to
an equivalent DC voltage. The outstanding dynamic range
and precision over temperature of this log amplifier make it
particularly useful for a variety of base-station and other
wireless applications, including automatic gain control
(AGC), transmitter power measurements, and receivedsignal-strength indication (RSSI) for terminal devices.
The MAX2014 can also be operated in a controller
mode where it measures, compares, and controls the
output power of a variable-gain amplifier as part of a
fully integrated AGC loop.
This logarithmic amplifier provides much wider measurement range and superior accuracy compared to
controllers based on diode detectors, while achieving
excellent temperature stability over the full -40°C to
+85°C operating range.
Applications
AGC Measurement and Control
RF Transmitter Power Measurement
RSSI Measurements
Cellular Base-Station, WLAN, Microwave Link,
Radar, and other Military Applications
Optical Networks
Features
♦ Complete RF Detector/Controller
♦ 50MHz to 1000MHz Frequency Range
♦ Exceptional Accuracy Over Temperature
♦ High Dynamic Range
♦ 2.7V to 5.25V Supply Voltage Range*
♦ Scaling Stable Over Supply and Temperature
Variations
♦ Controller Mode with Error Output
♦ Shutdown Mode with Typically 1µA of Supply
Current
♦ Available in 8-Pin TDFN Package
MAX2014
50MHz to 1000MHz, 75dB Logarithmic
Detector/Controller
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
MAX2014
7dB
Σ
50Ω
20kΩ
SET
OUT
8
7
2
INHI
INLO
3
6
1, 4
PWDN
5
20kΩ
Σ
7dB
Σ
7dB
V
CC
GND
POWER DETECTORS
OFFSET AND COMMON-
MODE AMP
Functional Diagram
19-0583; Rev 0; 6/06
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.
Pin Configuration appears at end of data sheet.
*See the Power-Supply Connections section.
+Denotes lead-free package.
T = Tape-and-reel package.
*EP = Exposed paddle.
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
(3mm x 3mm)
(3mm x 3mm)
MAX2014
50MHz to 1000MHz, 75dB Logarithmic
Detector/Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(MAX2014 Typical Application Circuit (Figure 1), VS= +3.3V, fRF= 50MHz to 1000MHz, R1 = 0Ω, R4 = 0Ω, RL= 10kΩ, TA= -40°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
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.
VCC(Pins 1, 4) to GND........................................-0.3V to +5.25V
SET, PWDN to GND....................................-0.3V to (V
CC
+ 0.3V)
Input Power Differential INHI, INLO................................+23dBm
Input Power Single Ended (INHI or INLO grounded).....+19dBm
Continuous Power Dissipation (T
A
= +70°C)
8-Pin TDFN (derate 18.5mW/°C above +70°C) .........1480mW
θ
JA
(without airflow)..........................................................54°C/W
θ
JC
(junction to exposed paddle) ...................................8.3°C/W
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
CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY
R4 = 75Ω ±1%, PWDN must be
connected to GND
4.75 5.25
Supply Voltage V
S
R4 = 0Ω 2.7 3.6
V
TA = +25°C, VS = 5.25V,
R4 = 75Ω
17.3
Supply Current I
CC
TA = +25°C 17.3 20.5
mA
I
CC
TA = -40°C to +85°C 0.05 mA/°C
Shutdown Current I
CC
V
PWDN
= V
CC
1µA
CONTROLLER REFERENCE (SET)
SET Input Voltage Range
V
SET Input Impedance 40 kΩ
DETECTOR OUTPUT (OUT)
Source Current 4mA
Sink Current 450 µA
Minimum Output Voltage
0.5 V
Maximum Output Voltage
AC ELECTRICAL CHARACTERISTICS
(MAX2014 Typical Application Circuit (Figure 1), VS= +3.3V, fRF= 50MHz to 1000MHz, R1 = 0Ω, R4 = 0Ω, RL= 10kΩ, TA= -40°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
RF Input Frequency Range f
RF
MHz
Return Loss S
11
-15 dB
Large-Signal Response Time
P
IN
= no signal to 0dBm,
±0.5dB settling accuracy
150 ns
RSSI MODE—50MHz
RF Input Power Range (Note 2)
dBm
±3dB Dynamic Range TA = -40°C to +85°C (Note 3) 70 dB
Range Center -30 dBm
Supply Current Variation with Temp
0.5 to 1.8
V
OUT(MIN
V
OUT(MAX
SYMBOL
50 to 1000
-65 to +5
MAX2014
50MHz to 1000MHz, 75dB Logarithmic
Detector/Controller
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2014 Typical Application Circuit (Figure 1), VS= +3.3V, fRF= 50MHz to 1000MHz, R1 = 0Ω, R4 = 0Ω, RL= 10kΩ, TA= -40°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
Temp Sensitivity when TA > +25°C
T
A
= +25°C to +85°C,
P
IN
= -25dBm
Temp Sensitivity when TA < +25°C
T
A
= -40°C to +25°C,
P
IN
= -25dBm
Typical Slope Variation TA = -40°C to +85°C -4
Intercept (Note 5) -100 dBm
Typical Intercept Variation TA = -40°C to +85°C 0.03
RSSI MODE—100MHz
RF Input Power Range (Note 2)
dBm
±3dB Dynamic Range TA = -40°C to +85°C (Note 3) 70 dB
Range Center -30 dBm
Temp Sensitivity when TA > +25°C
T
A
= +25°C to +85°C,
P
IN
= -25dBm
Temp Sensitivity when TA < +25°C
T
A
= -40°C to +25°C,
P
IN
= -25dBm
Typical Slope Variation TA = -40°C to +85°C -4
Intercept (Note 5) -100 dBm
Typical Intercept Variation TA = -40°C to +85°C 0.03
RSSI MODE—900MHz
RF Input Power Range (Note 2)
dBm
±3dB Dynamic Range TA = -40°C to +85°C (Note 3) 70 dB
Range Center -30 dBm
Temp Sensitivity when TA > +25°C
T
A
= +25°C to +85°C,
P
IN
= -25dBm
Temp Sensitivity when TA < +25°C
T
A
= -40°C to +25°C,
P
IN
= -25dBm
Typical Slope Variation TA = -40°C to +85°C -4
Intercept (Note 5) -97 dBm
Typical Intercept Variation TA = -40°C to +85°C 0.02
Note 1: The MAX2014 is guaranteed by design for TA= -40°C to +85°C, as specified.
Note 2: Typical minimum and maximum range of the detector at the stated frequency.
Note 3: Dynamic range refers to the range over which the error remains within the stated bounds. The error is calculated at T
A
= -40°C
and +85°C, relative to the curve at T
A
= +25°C.
Note 4: The slope is the variation of the output voltage per change in input power. It is calculated by fitting a root-mean-square
(RMS) straight line to the data indicated by RF input power range.
Note 5: The intercept is an extrapolated value that corresponds to the output power for which the output voltage is zero.
It is calculated by fitting an RMS straight line to the data.
SYMBOL
+0.0083
-0.0154
-65 to +5
+0.0083
-0.0154
-65 to +5
±0.0083
-0.0154