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PDF MAX2204 Data sheet ( Hoja de datos )
| Número de pieza | MAX2204 | |
| Descripción | RF Power Detector | |
| Fabricantes | Maxim Integrated Products | |
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19-0753; Rev 0; 4/07
EVAALVUAAILTAIOBNLEKIT
RF Power Detector
General Description
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.
Applications
WCDMA, cdma2000
High-Speed Downlink Packet Access (HSDPA)
High-Speed Uplink Packet Access (HSUPA)
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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
Ordering Information
PART
TEMP RANGE
MAX2204EXK+ -40°C to +85°C
+Denotes a lead-free package.
PIN-
PACKAGE
5 SC70
PKG
CODE
X5+1
cdma2000 is a registered trademark of Telecommunications
Industry Association.
Pin Configuration
TOP VIEW
+
VCC 1
5 OUT
GND 2 MAX2204
RFIN 3
4 ENA
________________________________________________________________ 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.
1 page  
RF Power Detector
Pin Description
PIN NAME
FUNCTION
1 VCC 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 VCC to turn the part on.
5
OUT
Power Detector Output. Filter with a capacitor to GND.
COUPLER 1
50Ω
50Ω
PA 1
COUPLER 1
50Ω
COUPLER 2
10Ω
10Ω
50Ω
PA 1
PA 2
PEAK
DETECT
BUFFER
DETECTOR
OUTPUT
PEAK
DETECT
BUFFER
DETECTOR
OUTPUT
ENABLE
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BIAS
MAX2204
APPLICATION DIAGRAM FOR ONE PA
Figure 1. Typical Application Circuit
ENABLE
BIAS
MAX2204
APPLICATION DIAGRAM FOR TWO PAs
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 VCC. 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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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MAX2204.PDF ] | |
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