19-0753; Rev 0; 4/07
KIT
ATION
EVALU
BLE
AVAILA
RF Power Detector
General Description
Features
o
-16dBm to +5dBm Detection Range
o
±0.3dB Detection Error Due to Temperature
o
+2.7V to +3.3V Single-Supply Operation
o
Easy-to-Assemble, Lead-Free, 5-Pin SC70
Package
MAX2204
The MAX2204 RF power detector is designed to oper-
ate from 450MHz to 2.5GHz. The device is ideal for
wideband code-division multiple access (WCDMA),
cdma2000
®
, and high-speed downlink/uplink packet
access. The MAX2204 accepts an RF signal at the
input, and outputs a highly repeatable voltage. The out-
put voltage increases monotonically with increasing
input power. The device is designed to compensate for
temperature and process shifts, reducing the typical
output variation to less than ±0.5dB at full input power
and ±1.5dB at the lower power.
The MAX2204 features a detection range from -16dBm
to +5dBm. High input impedance allows for low-loss
resistive tap if an isolator is used. The device uses
external termination at the input so that the RF signal
from several directional couplers can be connected to
a single detector chip.
The MAX2204 operates from a 2.7V to 3.3V power
supply. The device is available in a tiny 5-pin SC70 pack-
age. Electrical performance is guaranteed over a -40°C to
+85°C temperature range.
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
5 SC70
PKG
CODE
X5+1
Applications
WCDMA, cdma2000
High-Speed Downlink Packet Access (HSDPA)
High-Speed Uplink Packet Access (HSUPA)
MAX2204EXK+
+Denotes
a lead-free package.
Pin Configuration
TOP VIEW
cdma2000 is a registered trademark of Telecommunications
Industry Association.
+
V
CC
1
5
OUT
GND 2
MAX2204
4
ENA
RFIN 3
________________________________________________________________
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.
RF Power Detector
MAX2204
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +3.6V
OUT, Logic Input (ENA) to GND ................-0.3V to (V
CC
+ 0.3V)
RF Input Power ...............................................................+10dBm
Continuous Power Dissipation (T
A
= +70°C)
(derate 3.1mW/°C above +70°C) ................................247mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
θ
JC
...............................................................................+115°C/W
θ
JA
...............................................................................+324°C/W
Storage Temperature Range .............................-65°C to +160°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.
CAUTION!
ESD SENSITIVE DEVICE
Note:
This part is not for automotive applications.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 3.3V, T
A
= -40°C to +85°C, ENA = 2.0V, no RF signal applied. Typical values are at V
CC
= 2.85V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
Operating Supply Current
Sleep Mode Supply Current
ENA Logic-High Threshold
ENA Logic-Low Threshold
ENA Input Current
V
IH
V
IL
ENA = 2V
ENA = 0.6V
-2
-2
SYMBOL
V
CC
I
CC
ENA = 0V
2
0.6
+10
+1
CONDITIONS
MIN
2.7
1.2
0.5
TYP
MAX
3.3
2.5
10
UNITS
V
mA
µA
V
V
µA
AC ELECTRICAL CHARACTERISTICS
(MAX2204 Evaluation Kit, V
CC
= 2.85V, T
A
= -40°C to +85°C, ENA = 2.0V. f
RF
= 450MHz to 2.5GHz. Typical values are at V
CC
= 2.85V,
T
A
=+25°C, unless otherwise noted.) (Note 1)
PARAMETER
RF Input Frequency
RF Input Level for 2.0V
Minimum Input Level
T
A
= +25°C, RFIN at 836MHz
T
A
= +25°C, RFIN at 1880MHz
-16dBm to -15dBm change in P
IN
(836MHz to 2500MHz)
V
CC
= 2.85V,
836MHz to 1880MHz
T
A
= -40°C to +85°C
(Note 2)
824MHz to 849MHz
1850MHz to 1980MHz
P
IN
for 2.0V output
P
IN
for 0.1V output
SYMBOL
CONDITIONS
MIN
450
3.3
1.9
8
4.8
3.4
14
±0.5
±1.5
0.1
0.2
±1.1
dB
±4
dB
TYP
MAX
2500
6.3
4.9
UNITS
MHz
dBm
mV
Power Detector Accuracy Due to
Temperature
In-Band Variation
Note 1:
Specifications over T
A
= -40°C to +85°C are guaranteed by design. Production tests are performed at T
A
= +25°C.
Note 2:
Guaranteed by design and characterization.
2
_______________________________________________________________________________________
RF Power Detector
Typical Operating Characteristics
(MAX2204 Evaluation Kit, typical values are at V
CC
= 2.85V, ENA = 2.0V, T
A
= +25°C, modulation equals CW, unless otherwise noted.)
DETECTOR ERROR FROM
T
A
= +25°C AT 450MHz
MAX2204 toc02
MAX2204
OUTPUT VOLTAGE vs. INPUT POWER
MAX2204 toc01
OUTPUT VOLTAGE vs. INPUT POWER
3.0
f = 1950MHz
2.5
2.0
V
OUT
(V)
1.5
1.0
V
CC
= 2.7V, 3.0V, 3.3V
ERROR (dB)
1.5
f = 836MHz
2.0
V
CC
= 2.7V, 3.0V, 3.3V
V
OUT
(V)
1.5
f = 450MHz
1.0
0.5
0
-0.5
-1.0
-1.5
T
A
= +85°C
T
A
= -40°C
1.0
0.5
0.5
0
-20
-15
-10
-5
P
IN
(dBm)
0
5
10
-20
-15
-10
-5
P
IN
(dBm)
0
5
10
0
-20
-15
-10
-5
P
IN
(dBm)
0
5
10
DETECTOR ERROR FROM
T
A
= +25°C AT 824MHz
MAX2204 toc04
DETECTOR ERROR FROM
T
A
= +25°C AT 849MHz
MAX2204 toc05
DETECTOR ERROR FROM
T
A
= +25°C AT 1850MHz
f = 1850MHz
1.0
0.5
ERROR (dB)
0
-0.5
T
A
= -40°C
MAX2204 toc06
1.5
f = 824MHz
1.0
0.5
ERROR (dB)
T
A
= -40°C
1.5
f = 849MHz
1.0
0.5
ERROR (dB)
0
-0.5
T
A
= -40˚C
1.5
0
-0.5
-1.0
-1.5
-20
-15
-10
-5
P
IN
(dBm)
0
5
10
T
A
= +85°C
-1.0
-1.5
-20
-15
-10
T
A
= +85˚C
-1.0
-1.5
T
A
= +85°C
-5
P
IN
(dBm)
0
5
10
-20
-15
-10
-5
P
IN
(dBm)
0
5
10
DETECTOR ERROR FROM
T
A
= +25°C AT 1910MHz
f = 1910MHz
1.0
0.5
ERROR (dB)
ERROR (dB)
0
-0.5
-1.0
-1.5
-20
-15
-10
-5
P
IN
(dBm)
0
5
10
T
A
= +85°C
T
A
= -40°C
MAX2204 toc07
DETECTOR ERROR FROM
T
A
= +25°C AT 2500MHz
T
A
= -40°C
1.0
0.5
0
-0.5
-1.0
f = 2500MHz
-1.5
-20
-15
-10
-5
P
IN
(dBm)
0
5
10
T
A
= +85°C
MAX2204 toc08
1.5
1.5
_______________________________________________________________________________________
MAX2204 toc03
2.5
3
RF Power Detector
MAX2204
Typical Operating Characteristics (continued)
(MAX2204 Evaluation Kit, typical values are at V
CC
= 2.85V, ENA = 2.0V, T
A
= +25°C, modulation equals CW, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT POWER
AT 836MHz WITH RESISTIVE TAP
MAX2204 toc09
OUTPUT VOLTAGE vs. INPUT POWER
AT 1880MHz WITH RESISTIVE TAP
f = 1880MHz
R = 1.5kΩ
2.0
MAX2204 toc10
2.5
f = 836MHz
R = 3kΩ
2.0
2.5
V
OUT
(V)
1.0
V
OUT
(V)
0
5
10
15
20
P
IN
(dBm)
25
30
1.5
1.5
1.0
0.5
0.5
0
0
0
5
10
15
20
P
IN
(dBm)
25
30
RESPONSE TIME
MAX2204 toc11
DEVIATION FROM DPCCH+1DPDCH, 1950MHz
f = 1950MHz
0.4
0.2
0
-0.2
-0.4
DPCCH+5DPDCH
-0.6
DPCCH+4DPDCH
DPCCH+2DPDCH
DPCCH+3DPDCH
MAX2204 toc12
ENA
1V/div
0.6
V
OUT
200mV/div
200µs/div
DEVIATION (dB)
-25
-20
-15
-10
-5
P
IN
(dBm)
0
5
10
OUTPUT VOLTAGE vs. INPUT POWER
WITH WCDMA DOWNLINK
f = 2140MHz
2.0
1 DPCH
PCPCH + SCH
MAX2204 toc13
2.5
V
OUT
(V)
1.5
3 DPCH,
PCPCH + SCH + 1DPCH,
PCPCH + SCH + 3DPCH
1.0
0.5
0
-20
-15
-10
-5
P
IN
(dBm)
0
5
10
4
_______________________________________________________________________________________
RF Power Detector
Pin Description
PIN
1
2
3
4
5
NAME
V
CC
GND
RFIN
ENA
OUT
FUNCTION
Power-Supply Pin. Bypass to GND with a capacitor as close as possible to the pin.
Ground Connection. Use multiple ground vias to connect the GND pin to the ground plane.
RF Input. AC-couple with an external capacitor.
Enable Input. Drive low to turn the part off. Drive high or connect to V
CC
to turn the part on.
Power Detector Output. Filter with a capacitor to GND.
MAX2204
PA 1
COUPLER 1
PA 1
COUPLER 1
50Ω
10Ω
PA 2
50Ω
COUPLER 2
50Ω
10Ω
50Ω
PEAK
DETECT
BUFFER
DETECTOR
OUTPUT
PEAK
DETECT
BUFFER
DETECTOR
OUTPUT
ENABLE
BIAS
ENABLE
BIAS
MAX2204
APPLICATION DIAGRAM FOR ONE PA
MAX2204
APPLICATION DIAGRAM FOR TWO PAs
Figure 1. Typical Application Circuit
Detailed Description
The MAX2204 RF power detector is designed to operate
from 450MHz to 2.5GHz. The device accepts an RF
signal at the input and outputs a highly repeatable volt-
age, which increases monotonically with increasing
input power. See the
Typical Operating Characteristics.
The device is designed to compensate for temperature
and process shifts, reducing the typical output variation
to less than ±0.5dB at full input power and ±1.5dB at
the lower power.
The MAX2204 features a detection range from -16dBm
to +5dBm. High input impedance allows a for low-loss
resistive tap if an isolator is used. The device uses
external termination at the input so that the RF signal
from several directional couplers can be connected to
a single detector chip.
The MAX2204 features an enable input (ENA) that
allows the device to be put in shutdown. For normal
operation, drive ENA high or connect to V
CC
. For
device shutdown, drive ENA low.
The MAX2204 integrates an output series resistor of
approximately 100kΩ. For output filtering, connect only
a capacitor to ground at the output.
Applications Information
The MAX2204 uses external termination when using
directional couplers. See Figure 1 for the typical appli-
cation circuit. The output of the detector is typically
connected to an ADC in cdma2000 or WCDMA power-
control topology.
_______________________________________________________________________________________
5
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