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MAX2204EXK+T

P1-P3P4-P6P7-P7
MAX2204
RF Power Detector
4 _______________________________________________________________________________________
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
P
IN
(dBm)
V
OUT
(V)
MAX2204 toc09
0 5 10 15 20 25 30
0
0.5
1.0
1.5
2.0
2.5
f = 836MHz
R = 3kΩ
OUTPUT VOLTAGE vs. INPUT POWER
AT 1880MHz WITH RESISTIVE TAP
P
IN
(dBm)
V
OUT
(V)
MAX2204 toc10
0 5 10 15 20 25 30
0
0.5
1.0
1.5
2.0
2.5
f = 1880MHz
R = 1.5kΩ
200µs/div
RESPONSE TIME
MAX2204 toc11
V
OUT
200mV/div
ENA
1V/div
OUTPUT VOLTAGE vs. INPUT POWER
WITH WCDMA DOWNLINK
P
IN
(dBm)
V
OUT
(V)
MAX2204 toc13
-20 -15 -10 -5 0 5 10
0
0.5
1.0
1.5
2.0
2.5
1 DPCH
PCPCH + SCH
3 DPCH,
PCPCH + SCH + 1DPCH,
PCPCH + SCH + 3DPCH
f = 2140MHz
MAX2204
RF Power Detector
_______________________________________________________________________________________ 5
Pin Description
PIN NAME FUNCTION
1V
CC
Power-Supply Pin. Bypass to GND with a capacitor as close as possible to the pin.
2 GND Ground Connection. Use multiple ground vias to connect the GND pin to the ground plane.
3 RFIN RF Input. AC-couple with an external capacitor.
4 ENA Enable Input. Drive low to turn the part off. Drive high or connect to V
CC
to turn the part on.
5 OUT Power Detector Output. Filter with a capacitor to GND.
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.
PEAK
DETECT
BUFFER
PA 1
PA 1
PA 2
COUPLER 1
COUPLER 1
COUPLER 2
BIAS
DETECTOR
OUTPUT
10Ω
10Ω
50Ω
50Ω
50Ω
50Ω
ENABLE
ENABLE
PEAK
DETECT
BUFFER
BIAS
DETECTOR
OUTPUT
MAX2204
MAX2204
APPLICATION DIAGRAM FOR ONE PA
APPLICATION DIAGRAM FOR TWO PAs
Figure 1. Typical Application Circuit
MAX2204
The MAX2204 has high input impedance to allow
for high-value resistive tapping from a power amplifier.
This coupling method is the lowest cost and lowest
power loss when used with an isolator. See Figure 2 for
the typical application circuit.
The MAX2204 input impedance over frequency is listed
in Table 1.
Layout
The MAX2204 is not particularly sensitive to the layout,
since it only needs 5dBm for maximum output voltage.
However, there are two areas that need attention: the
GND pin and the supply bypassing. The GND pin should
be connected to the PCB ground with a GND via as
close as possible, and the supply bypass capacitor
should be close to the part.
RF Power Detector
6 _______________________________________________________________________________________
Table 1. MAX2204 Input Impedance Over Frequency
P
IN
= -16dBm P
IN
= +5dBm
FREQUENCY (GHz)
REAL (Ω) IMAG (jΩ) REAL (Ω) IMAG (jΩ)
0.4 109.3 -556.5 120.0 -563.3
0.6 80.5 -369.0 91.0 -379.3
0.8 73.4 -300.3 80.8 -310.7
1.0 64.1 -260.2 75.6 -275.8
1.2 65.8 -216.4 79.9 -231.3
1.4 62.3 -194.9 64.4 -202.8
1.6 48.9 -177.5 53.9 -192.3
1.8 33.1 -157.4 39.9 -174.6
2.0 21.8 -142.2 25.9 -158.3
2.2 15.2 -131.2 18.3 -144.5
2.4 10.6 -116.8 10.6 -131.9
2.6 11.8 -99.8 10.6 -115.6
TO ANT
PA
OUTPUT
TO ADC
ISOLATOR
C
FILTER
PEAK
DETECT
BUFFER
BIAS
ENABLE
MAX2204
Figure 2. Typical Application Circuit Using Resistive Tapping
from a Power Amplifier
P1-P3P4-P6P7-P7

MAX2204EXK+T

Mfr. #:
Buy MAX2204EXK+T
Manufacturer:
Maxim Integrated
Description:
RF Detector RF Power Detector
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