MAX2204EXK - Maxim Integrated Products, Inc.

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)

Features

o-16dBm to +5dBm Detection Range

o±0.3dB Detection Error Due to Temperature

o+2.7V to +3.3V Single-Supply Operation

oEasy-to-Assemble, Lead-Free, 5-Pin SC70

Package

MAX2204

RF Power Detector

________________________________________________________________

Maxim Integrated Products

GND

ENARFIN

1 5 OUTVCC

MAX2204

TOP VIEW

Pin Configuration

Ordering Information

19-0753; Rev 0; 4/07

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.

Denotes a lead-free package.

cdma2000 is a registered trademark of Telecommunications

Industry Association.

PART TEMP RANGE PIN-

PACKAGE

PKG

CODE

MAX2204EXK+ -40°C to +85°C 5 SC70 X5+1

EVALUATION KIT

AVAILABLE

MAX2204

RF Power Detector

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC = 2.7V to 3.3V, TA= -40°C to +85°C, ENA = 2.0V, no RF signal applied. Typical values are at VCC = 2.85V, TA= +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.

Note 1: Specifications over TA= -40°C to +85°C are guaranteed by design. Production tests are performed at TA= +25°C.

Note 2: Guaranteed by design and characterization.

VCC to GND ...........................................................-0.3V to +3.6V

OUT, Logic Input (ENA) to GND ................-0.3V to (VCC + 0.3V)

RF Input Power ...............................................................+10dBm

Continuous Power Dissipation (TA= +70°C)

(derate 3.1mW/°C above +70°C)................................247mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

θJC ...............................................................................+115°C/W

θJA ...............................................................................+324°C/W

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage VCC 2.7 3.3 V

Operating Supply Current ICC 1.2 2.5 mA

Sleep Mode Supply Current ENA = 0V 0.5 10 µA

ENA Logic-High Threshold VIH 2 V

ENA Logic-Low Threshold VIL 0.6 V

ENA = 2V -2 +10

ENA Input Current ENA = 0.6V -2 +1 µA

AC ELECTRICAL CHARACTERISTICS

(MAX2204 Evaluation Kit, VCC = 2.85V, TA= -40°C to +85°C, ENA = 2.0V. fRF = 450MHz to 2.5GHz. Typical values are at VCC = 2.85V,

TA=+25°C, unless otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

RF Input Frequency 450 2500 MHz

TA = +25°C, RFIN at 836MHz 3.3 4.8 6.3

RF Input Level for 2.0V TA = +25°C, RFIN at 1880MHz 1.9 3.4 4.9 dBm

Minimum Input Level -16dBm to -15dBm change in PIN

(836MHz to 2500MHz) 814 mV

PIN for 2.0V output ±0.5 ±1.1

Power Detector Accuracy Due to

Temperature

VCC = 2.85V,

836MHz to 1880MHz

TA = -40°C to +85°C

(Note 2) PIN for 0.1V output ±1.5 ±4

824MHz to 849MHz 0.1

In-Band Variation 1850MHz to 1980MHz 0.2 dB

Note: This part is not for automotive applications.

CAUTION! ESD SENSITIVE DEVICE

MAX2204

RF Power Detector

_______________________________________________________________________________________

OUTPUT VOLTAGE vs. INPUT POWER

PIN (dBm)

VOUT (V)

MAX2204 toc01

-20 -15 -10 -5 0 5 10

0.5

1.0

1.5

2.0

2.5

f = 836MHz

VCC = 2.7V, 3.0V, 3.3V

OUTPUT VOLTAGE vs. INPUT POWER

PIN (dBm)

VOUT (V)

MAX2204 toc02

-20 -15 -10 -5 0 5 10

0.5

1.0

1.5

2.0

2.5

3.0

f = 1950MHz

VCC = 2.7V, 3.0V, 3.3V

DETECTOR ERROR FROM

TA = +25°C AT 450MHz

PIN (dBm)

ERROR (dB)

MAX2204 toc03

-20 -15 -10 -5 0 5 10

-1.5

-1.0

-0.5

0.5

1.0

1.5

TA = -40°C

TA = +85°C

f = 450MHz

DETECTOR ERROR FROM

TA = +25°C AT 824MHz

PIN (dBm)

ERROR (dB)

MAX2204 toc04

-20 -15 -10 -5 0 5 10

-1.5

-1.0

-0.5

0.5

1.0

1.5

f = 824MHz

TA = +85°C

TA = -40°C

DETECTOR ERROR FROM

TA = +25°C AT 849MHz

PIN (dBm)

ERROR (dB)

MAX2204 toc05

-20 -15 -10 -5 0 5 10

-1.5

-1.0

-0.5

0.5

1.0

1.5

f = 849MHz TA = -40˚C

TA = +85˚C

DETECTOR ERROR FROM

TA = +25°C AT 1850MHz

PIN (dBm)

ERROR (dB)

MAX2204 toc06

-20 -15 -10 -5 0 5 10

-1.5

-1.0

-0.5

0.5

1.0

1.5

f = 1850MHz

TA = +85°C

TA = -40°C

DETECTOR ERROR FROM

TA = +25°C AT 1910MHz

PIN (dBm)

ERROR (dB)

MAX2204 toc07

-20 -15 -10 -5 0 5 10

-1.5

-1.0

-0.5

0.5

1.0

1.5

f = 1910MHz

TA = +85°C

TA = -40°C

DETECTOR ERROR FROM

TA = +25°C AT 2500MHz

PIN (dBm)

ERROR (dB)

MAX2204 toc08

-20 -15 -10 -5 0 5 10

-1.5

-1.0

-0.5

0.5

1.0

1.5

f = 2500MHz

TA = -40°C

TA = +85°C

Typical Operating Characteristics

(MAX2204 Evaluation Kit, typical values are at VCC = 2.85V, ENA = 2.0V, TA= +25°C, modulation equals CW, unless otherwise noted.)

MAX2204

RF Power Detector

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(MAX2204 Evaluation Kit, typical values are at VCC = 2.85V, ENA = 2.0V, TA= +25°C, modulation equals CW, unless otherwise noted.)

OUTPUT VOLTAGE vs. INPUT POWER

AT 836MHz WITH RESISTIVE TAP

PIN (dBm)

VOUT (V)

MAX2204 toc09

0 5 10 15 20 25 30

0.5

1.0

1.5

2.0

2.5

f = 836MHz

R = 3kΩ

OUTPUT VOLTAGE vs. INPUT POWER

AT 1880MHz WITH RESISTIVE TAP

PIN (dBm)

VOUT (V)

MAX2204 toc10

0 5 10 15 20 25 30

0.5

1.0

1.5

2.0

2.5

f = 1880MHz

R = 1.5kΩ

200µs/div

RESPONSE TIME

MAX2204 toc11

VOUT

200mV/div

ENA

1V/div

DEVIATION FROM DPCCH+1DPDCH, 1950MHz

PIN (dBm)

DEVIATION (dB)

MAX2204 toc12

-25 -20 -15 -10 -5 0 5 10

-0.6

-0.4

-0.2

0.2

0.4

0.6

DPCCH+5DPDCH

DPCCH+4DPDCH

DPCCH+3DPDCH

DPCCH+2DPDCH

f = 1950MHz

OUTPUT VOLTAGE vs. INPUT POWER

WITH WCDMA DOWNLINK

PIN (dBm)

VOUT (V)

MAX2204 toc13

-20 -15 -10 -5 0 5 10

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

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

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 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.

PEAK

DETECT BUFFER

PA 1

PA 2

COUPLER 1

COUPLER 2

BIAS

DETECTOR

OUTPUT

10Ω

50Ω

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

PIN = -16dBm PIN = +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

OUTPUT

TO ADC

ISOLATOR

CFILTER

PEAK

DETECT BUFFER

BIAS

ENABLE

MAX2204

Figure 2. Typical Application Circuit Using Resistive Tapping

from a Power Amplifier

MAX2204

RF Power Detector

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information

go to www.maxim-ic.com/packages.)

SC70, 5L.EPS

PACKAGE OUTLINE, 5L SC70

21-0076