MAXIM MAX4000, MAX4001, MAX4002 Technical data

19-2288; Rev 2; 12/07

2.5GHz 45dB RF-Detecting Controllers

General Description

The MAX4000/MAX4001/MAX4002 low-cost, low-power
logarithmic amplifiers are designed to control RF power
amplifiers (PA) operating in the 0.1GHz to 2.5GHz fre­quency range. A typical dynamic range of 45dB makes
this family of log amps useful in a variety of wireless appli­cations including cellular handset PA control, transmitter
power measurement, and RSSI for terminal devices.
Logarithmic amplifiers provide much wider measurement
range and superior accuracy to controllers based on
diode detectors. Excellent temperature stability is
achieved over the full operating range of -40°C to +85°C.

The choice of three different input voltage ranges elimi­nates the need for external attenuators, thus simplifying
PA control-loop design. The logarithmic amplifier is a volt­age-measuring device with a typical signal range of

-58dBV to -13dBV for the MAX4000, -48dBV to -3dBV for
the MAX4001, and -43dBV to +2dBV for the MAX4002.

The input signal for the MAX4000 is internally AC-coupled
using an on-chip 5pF capacitor in series with a 2kΩ input
resistance. This highpass coupling, with a corner at
16MHz, sets the lowest operating frequency and allows
the input signal source to be DC grounded. The
MAX4001/MAX4002 require an external coupling capaci­tor in series with the RF input port. These PA controllers
feature a power-on delay when coming out of shutdown,
holding OUT low for approximately 5µs to ensure glitch­free controller output.

The MAX4000/MAX4001/MAX4002 family is available in
an 8-pin µMAX
package (UCSP™). The device consumes 5.9mA with a

5.5V supply, and when powered down the typical shut­down current is 13µA.

®

package and an 8-bump chip-scale

Features

♦ Complete RF-Detecting PA Controllers

♦ Variety of Input Ranges

MAX4000: -58dBV to -13dBV
(-45dBm to 0dBm in 50Ω)
MAX4001: -48dBV to -3dBV
(-35dBm to +10dBm in 50Ω)
MAX4002: -43dBV to +2dBV
(-30dBm to +15dBm in 50Ω)

♦ Frequency Range from 100MHz to 2.5GHz

♦ Temperature Stable Linear-in-dB Response

♦ Fast Response: 70ns 10dB Step

♦ 10mA Output Sourcing Capability

♦ Low Power: 17mW at 3V (typ)

♦ Shutdown Current 30µA (max)

♦ Available in an 8-Bump UCSP and a Small 8-Pin

µMAX Package

Ordering Information

PART TEMP RANGE

MAX4000EBL-T -40°C to +85°C 8 UCSP-8

MAX4000EUA -40°C to +85°C 8 µMAX
MAX4001EBL-T -40°C to +85°C 8 UCSP-8
MAX4001EUA -40°C to +85°C 8 µMAX
MAX4002EBL-T -40°C to +85°C 8 UCSP-8
MAX4002EUA -40°C to +85°C 8 µMAX

PIN­PACKAGE

TOP

MARK

ABF

—

ABE

—

ABD

—

MAX4000/MAX4001/MAX4002

Applications

Pin Configurations appear at end of data sheet.

Transmitter Power Measurement and Control

TSSI for Wireless Terminal Devices

Functional Diagram

Cellular Handsets (TDMA, CDMA, GPRS, GSM)

RSSI for Fiber Modules

OUTPUT
ENABLE

DELAY

­gm

X1

MAX4000

OUT

CLPF

SET

V-I

DET DETDET

LOW­NOISE

BANDGAP

+

µMAX is a registered trademark of Maxim Integrated Products, Inc.

UCSP is a trademark of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products 1

SHDN

V

CC

RFIN

GND

(PADDLE)

OFFSET

COMP

DET

DET

10dB

10dB 10dB10dB

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

ELECTRICAL CHARACTERISTICS

(VCC= 3V, SHDN = 1.8V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

PARAMETER

CONDITIONS MIN

UNITS

Supply Voltage V

CC

2.7 5.5 V

Supply Current I

CC

VCC = 5.5V 5.9 9.3 mA

Shutdown Supply Current I

CC

SHDN = 0.8V, VCC = 5.5V 13 30 µA

Shutdown Output Voltage V

OUT

SHDN = 0.8V 100 mV

Logic-High Threshold V

H

1.8 V

Logic-Low Threshold V

L

0.8 V

SHDN = 3V 5 20

SHDN Input Current I

SHDN

SHDN = 0 -0.8

µA

SET-POINT INPUT

Voltage Range (Note 2) V

SET

Corresponding to central 40dB

1.45 V

Input Resistance R

IN

30 MΩ

Slew Rate (Note 3) 16 V/µs

MAIN OUTPUT

High, I

SOURCE

= 10mA

Voltage Range V

OUT

Low, I

SINK

= 350µA

V

Output-Referred Noise From CLPF 8

nV/√Hz

Small-Signal Bandwidth BW From CLPF 20 MHz

Slew Rate

V/µs

(Voltages Referenced to GND)
V

CC

...........................................................................-0.3V to +6V

OUT, SET, SHDN, CLPF.............................-0.3V to (V

CC

+ 0.3V)

RFIN

MAX4000 ......................................................................+6dBm

MAX4001 ....................................................................+16dBm

MAX4002 ....................................................................+19dBm

Equivalent Voltage

MAX4000 ..................................................................0.45V

RMS

MAX4001 ....................................................................1.4V

RMS

MAX4002 ....................................................................2.0V

RMS

OUT Short Circuit to GND ..........................................Continuous

Continuous Power Dissipation (TA = +70°C)

8-Bump UCSP (derate 4.7mW/°C above +70°C).........379mW

8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW

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

Storage Temperature Range .............................-65°C to +150°C

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

SYMBOL

TYP MAX

-0.01

0.35

V

= 0.2V to 2.6V 8

OUT

2.65 2.75

0.15

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

_______________________________________________________________________________________ 3

Note 1: All devices are 100% production tested at TA= +25°C and are guaranteed by design for TA= -40°C to +85°C as specified.

All production AC testing is done at 100MHz.

Note 2: Typical value only, set-point input voltage range determined by logarithmic slope and logarithmic intercept.
Note 3: Set-point slew rate is the rate at which the reference level voltage, applied to the inverting input of the g

m

stage, responds to

a voltage step at the SET pin (see Figure 1).

Note 4: Typical min/max range for detector.
Note 5: MAX4000 internally AC-coupled.
Note 6: MAX4001/MAX4002 are internally resistive-coupled to V

CC

.

ELECTRICAL CHARACTERISTICS

(VCC= 3V, SHDN = 1.8V, fRF= 100MHz to 2.5GHz, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
(Note 1)

PARAMETER

CONDITIONS MIN TYP

UNITS

RF Input Frequency f

RF

100

MHz

MAX4000 -58 -13

MAX4001 -48 -3

RF Input Voltage Range
(Note 4)

V

RF

MAX4002 -43 +2

dBV

MAX4000 -45 0

MAX4001 -35 +10

Equivalent Power Range

(50Ω Terminated) (Note 4)

P

RF

MAX4002 -30 +15

dBm

f

RF

= 100MHz 22.5 25.5 28.5

f

RF

= 900MHz 25Logarithmic Slope V

S

f

RF

= 1900MHz 29

mV/dB

MAX4000 -62 -55 -49

MAX4001 -52 -45 -39fRF = 100MHz

MAX4002 -47 -40 -34

MAX4000 -57

MAX4001 -48

fRF = 900MHz

MAX4002 -43

MAX4000 -56

MAX4001 -45

Logarithmic Intercept P

X

fRF = 1900MHz

MAX4002 -41

dBm

RF INPUT INTERFACE

DC Resistance R

DC

MAX4001/MAX4002, connected to V

CC

(Note 5)

2kΩ

Inband Resistance R

IB

2kΩ

Inband Capacitance C

IB

MAX4000, internally AC-coupled
(Note 6)

0.5 pF

SYMBOL

MAX

2500

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= 3V, SHDN = VCC, TA= +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem­peratures.)

MAX4001 LOG CONFORMANCE

vs. INPUT POWER (μMAX)

MAX4000 toc08

INPUT POWER (dBm)

ERROR (dB)

100-30 -20 -10

-3

-2

-1

0

1

2

3

4

-4

-40 20

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4002 LOG CONFORMANCE

vs. INPUT POWER (μMAX)

MAX4000 toc09

INPUT POWER (dBm)

ERROR (dB)

155-25 -15 -5

-3

-2

-1

0

1

2

3

4

-4

-35 25

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4000 LOG CONFORMANCE

vs. INPUT POWER (μMAX)

MAX4000 toc07

INPUT POWER (dBm)

ERROR (dB)

0-10-40 -30 -20

-3

-2

-1

0

1

2

3

4

-4

-50 10

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4002

SET vs. INPUT POWER (UCSP)

MAX4000 toc06

INPUT POWER (dBm)

SET (V)

2010-10 0-20-30

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0

-40 30

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4001

SET vs. INPUT POWER (UCSP)

INPUT POWER (dBm)

SET (V)

100-20 -10-30-40

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0

-50 20

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4000 toc05

MAX4000

SET vs. INPUT POWER (UCSP)

MAX4000 toc04

INPUT POWER (dBm)

SET (V)

0-10-30 -20-40-50

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0

-60 10

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4002

SET vs. INPUT POWER (μMAX)

MAX4000 toc03

INPUT POWER (dBm)

SET (V)

2010-30 -20 -10 0

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-40 30

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4001

SET vs. INPUT POWER (μMAX)

MAX4000 toc02

INPUT POWER (dBm)

SET (V)

100-40 -30 -20 -10

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-50 20

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4000

SET vs. INPUT POWER (μMAX)

MAX4000 toc01

INPUT POWER (dBm)

SET (V)

0-10-50 -40 -30 -20

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-60 10

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VCC= 3V, SHDN = VCC, TA= +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem­peratures.)

MAX4002 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.1GHz (UCSP)

MAX4000 toc18

INPUT POWER (dBm)

SET (V)

155-25 -15 -5

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-35 25

TA = +85°C

TA = +25°C

TA = -40°C

ERROR (dB)

MAX4001 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.1GHz (UCSP)

MAX4000 toc17

INPUT POWER (dBm)

SET (V)

100-30 -20 -10

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-40 20

TA = +85°C

TA = +25°C

TA = -40°C

ERROR (dB)

MAX4000 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.1GHz (UCSP)

MAX4000 toc16

INPUT POWER (dBm)

SET (V)

0-10-40 -30 -20

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-50 10

TA = +85°C

TA = +25°C

TA = -40°C

ERROR (dB)

MAX4002 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.1GHz (μMAX)

MAX4000 toc15

INPUT POWER (dBm)

SET (V)

ERROR (dB)

155-25 -15 -5

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-35 25

TA = +85°C

TA = +25°C

TA = -40°C

MAX4001 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.1GHz (μMAX)

MAX4000 toc14

INPUT POWER (dBm)

SET (V)

100-30 -20 -10

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-40 20

TA = +85°C

TA = +25°C

TA = -40°C

ERROR (dB)

MAX4000 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.1GHz (μMAX)

MAX4000 toc13

INPUT POWER (dBm)

SET (V)

0-10-40 -30 -20

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-50 10

TA = +85°C

TA = +25°C

TA = -40°C

ERROR (dB)

MAX4002 LOG CONFORMANCE

vs. INPUT POWER (UCSP)

MAX4000 toc12

INPUT POWER (dBm)

ERROR (dB)

155-25 -15 -5

-3

-2

-1

0

1

2

3

4

-4

-35 25

2.5GHz

0.9GHz

0.1GHz

1.9GHz

MAX4001 LOG CONFORMANCE

vs. INPUT POWER (UCSP)

MAX4000 toc11

INPUT POWER (dBm)

ERROR (dB)

100-30 -20 -10

-3

-2

-1

0

1

2

3

4

-4

-40 20

2.5GHz

0.9GHz

0.1GHz

1.9GHz

MAX4000 LOG CONFORMANCE

vs. INPUT POWER (UCSP)

MAX4000 toc10

INPUT POWER (dBm)

ERROR (dB)

0-10-40 -30 -20

-3

-2

-1

0

1

2

3

4

-4

-50 10

2.5GHz

0.9GHz

0.1GHz

1.9GHz

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= 3V, SHDN = VCC, TA= +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem­peratures.)

MAX4002 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 1.9GHz (μMAX)

MAX4000 toc27

INPUT POWER (dBm)

SET (V)

ERROR (dB)

155-25 -15 -5

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-35 25

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4001 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 1.9GHz (μMAX)

MAX4000 toc26

INPUT POWER (dBm)

SET (V)

ERROR (dB)

100-30 -20 -10

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-40 20

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4000 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 1.9GHz (μMAX)

MAX4000 toc25

INPUT POWER (dBm)

SET (V)

ERROR (dB)

0-10-40 -30 -20

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-50 10

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4002 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.9GHz (UCSP)

MAX4000 toc24

INPUT POWER (dBm)

SET (V)

155-25 -15 -5

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-35 25

TA = +85°C

TA = +25°C

TA = -40°C

ERROR (dB)

MAX4001 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.9GHz (UCSP)

MAX4000 toc23

INPUT POWER (dBm)

SET (V)

100-30 -20 -10

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-40 20

TA = +85°C

TA = +25°C

TA = -40°C

ERROR (dB)

MAX4000 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.9GHz (UCSP)

MAX4000 toc22

INPUT POWER (dBm)

SET (V)

0-10-40 -30 -20

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-50 10

TA = +85°C

TA = +25°C

TA = -40°C

ERROR (dB)

MAX4002 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.9GHz (μMAX)

MAX4000 toc21

INPUT POWER (dBm)

SET (V)

ERROR (dB)

155-25 -15 -5

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-35 25

TA = +85°C

TA = +25°C

TA = -40°C

MAX4001 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.9GHz (μMAX)

MAX4000 toc20

INPUT POWER (dBm)

SET (V)

ERROR (dB)

100-30 -20 -10

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-40 20

TA = +85°C

TA = +25°C

TA = -40°C

MAX4000 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 0.9GHz (μMAX)

MAX4000 toc19

INPUT POWER (dBm)

SET (V)

ERROR (dB)

0-10-40 -30 -20

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-50 10

TA = +85°C

TA = +25°C

TA = -40°C

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(VCC= 3V, SHDN = VCC, TA= +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem­peratures.)

MAX4001 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 2.5GHz (UCSP)

MAX4000 toc35

INPUT POWER (dBm)

SET (V)

ERROR (dB)

100-30 -20 -10

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-40 20

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4000 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 2.5GHz (UCSP)

MAX4000 toc34

INPUT POWER (dBm)

SET (V)

ERROR (dB)

0-10-40 -30 -20

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-50 10

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4002 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 2.5GHz (μMAX)

MAX4000 toc33

INPUT POWER (dBm)

SET (V)

ERROR (dB)

155-25 -15 -5

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-35 25

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4001 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 2.5GHz (μMAX)

MAX4000 toc32

INPUT POWER (dBm)

SET (V)

ERROR (dB)

100-30 -20 -10

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-40 20

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4000 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 2.5GHz (μMAX)

MAX4000 toc31

INPUT POWER (dBm)

SET (V)

ERROR (dB)

0-10-40 -30 -20

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-50 10

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4002 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 1.9GHz (UCSP)

MAX4000 toc30

INPUT POWER (dBm)

SET (V)

ERROR (dB)

155-25 -15 -5

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-35 25

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4001 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 1.9GHz (UCSP)

MAX4000 toc29

INPUT POWER (dBm)

SET (V)

ERROR (dB)

100-30 -20 -10

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-40 20

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4000 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 1.9GHz (UCSP)

MAX4000 toc28

INPUT POWER (dBm)

SET (V)

ERROR (dB)

0-10-40 -30 -20

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-50 10

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX4002 SET AND LOG CONFORMANCE

vs. INPUT POWER AT 2.5GHz (UCSP)

MAX4000 toc36

INPUT POWER (dBm)

SET (V)

ERROR (dB)

155-25 -15 -5

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.2

-3

-2

-1

0

1

2

3

4

-4

-35 25

TA = +85°C

TA = -40°C

TA = +25°C

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= 3V, SHDN = VCC, TA= +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem­peratures.)

MAX4002

LOG SLOPE vs. V

CC

(μMAX)

MAX4000 toc45

VCC (V)

LOG SLOPE (mV/dB)

5.04.54.03.53.0

25

26

27

28

29

30

31

32

33

34

24

2.5 5.5

1.9GHz

0.9GHz

0.1GHz

2.5GHz

MAX4001

LOG SLOPE vs. V

CC

(μMAX)

MAX4000 toc44

VCC (V)

LOG SLOPE (mV/dB)

5.04.53.0 3.5 4.0

25

26

27

28

29

30

31

32

24

2.5 5.5

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4000

LOG SLOPE vs. V

CC

(μMAX)

MAX4000 toc43

VCC (V)

LOG SLOPE (mV/dB)

5.04.53.0 3.5 4.0

25

26

27

28

29

30

31

32

24

2.5 5.5

2.5GHz

1.9GHz

0.9GHz

0.1GHz

FREQUENCY (GHz)

LOG SLOPE (mV/dB)

25

26

27

28

29

30

31

32

24

MAX4002

LOG SLOPE vs. FREQUENCY (UCSP)

2.01.51.00.50 2.5

MAX4000 toc42

TA = +25°C

TA = +85°C

TA = -40°C

MAX4001

LOG SLOPE vs. FREQUENCY (UCSP)

FREQUENCY (GHz)

LOG SLOPE (mV/dB)

25

26

27

28

29

30

31

32

23

24

MAX4000 toc41

2.01.51.00.50 2.5

TA = +25°C

TA = +85°C

TA = -40°C

MAX4000

LOG SLOPE vs. FREQUENCY (UCSP)

MAX4000 toc40

FREQUENCY (GHz)

LOG SLOPE (mV/dB)

2.01.51.00.5

25

26

27

28

29

30

31

24

0 2.5

TA = +25°C

TA = +85°C

TA = -40°C

MAX4002

LOG SLOPE vs. FREQUENCY (μMAX)

MAX4000 toc39

FREQUENCY (GHz)

LOG SLOPE (mV/dB)

2.01.51.00.5

25

26

27

28

29

30

31

32

33

24

0 2.5

TA = +25°C

TA = -40°C

TA = +85°C

MAX4001

LOG SLOPE vs. FREQUENCY (μMAX)

MAX4000 toc38

FREQUENCY (GHz)

LOG SLOPE (mV/dB)

2.01.51.00.5

24

25

26

27

28

29

30

31

32

23

0 2.5

TA = +25°C

TA = -40°C

TA = +85°C

MAX4000

LOG SLOPE vs. FREQUENCY (μMAX)

MAX4000 toc37

FREQUENCY (GHz)

LOG SLOPE (mV/dB)

2.01.51.00.5

25

26

27

28

29

30

31

24

0 2.5

TA = +25°C

TA = -40°C

TA = +85°C

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

_______________________________________________________________________________________ 9

Typical Operating Characteristics (continued)

(VCC= 3V, SHDN = VCC, TA= +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem­peratures.)

2.01.51.00.50 2.5

-44

-42

-40

-38

-36

-34

-32

-46

MAX4000 toc54

LOG INTERCEPT (dB)

MAX4002

LOG INTERCEPT vs. FREQUENCY (UCSP)

FREQUENCY (GHz)

TA = +85°C

TA = +25°C

TA = -40°C

-50

-48

-46

-44

-42

-40

-52

2.01.51.00.50 2.5

MAX4000 toc53

FREQUENCY (GHz)

LOG INTERCEPT (dBm)

MAX4001

LOG INTERCEPT vs. FREQUENCY (UCSP)

TA = +85°C

TA = +25°C

TA = -40°C

LOG INTERCEPT (dBm)

-60

-59

-58

-57

-56

-55

-61

MAX4000

LOG INTERCEPT vs. FREQUENCY (UCSP)

2.01.51.00.50 2.5

MAX4000 toc52

FREQUENCY (GHz)

TA = +85°C

TA = +25°C

TA = -40°C

MAX4002

LOG INTERCEPT vs. FREQUENCY (μMAX)

MAX4000 toc51

FREQUENCY (GHz)

LOG INTERCEPT (dBm)

2.01.51.00.5

-44

-42

-40

-38

-36

-34

-32

-46
0 2.5

TA = +25°C

TA = -40°C

TA = +85°C

MAX4001

LOG INTERCEPT vs. FREQUENCY (μMAX)

MAX4000 toc50

FREQUENCY (GHz)

LOG INTERCEPT (dBm)

2.01.51.00.5

-48

-47

-46

-45

-44

-43

-42

-41

-40

-39

-49
0 2.5

TA = +25°C

TA = -40°C

TA = +85°C

MAX4000

LOG INTERCEPT vs. FREQUENCY (μMAX)

MAX4000 toc49

FREQUENCY (GHz)

LOG INTERCEPT (dBm)

2.01.51.00.5

-58

-57

-56

-55

-54

-53

-52

-51

-50

-59
0 2.5

TA = +25°C

TA = -40°C

TA = +85°C

LOG SLOPE (mV/dB)

5.04.54.03.53.02.5 5.5

MAX4000 toc48

25

27

29

31

33

23

MAX4002

LOG SLOPE vs. V

CC

(UCSP)

VCC (V)

0.9GHz

2.5GHz

1.9GHz

0.1GHz

LOG SLOPE (mV/dB)

25

27

29

31

33

23

5.04.54.03.53.02.5 5.5

MAX4000 toc47

MAX4001

LOG SLOPE vs. V

CC

(UCSP)

VCC (V)

0.9GHz

2.5GHz

1.9GHz

0.1GHz

LOG SLOPE (mV/dB)

MAX4000

LOG SLOPE vs. V

CC

(UCSP)

5.04.54.03.53.02.5 5.5

MAX4000 toc46

25

26

27

28

29

30

31

32

24

V

CC

(V)

0.9GHz

2.5GHz

1.9GHz

0.1GHz

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

10 ______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= 3V, SHDN = VCC, TA= +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem­peratures.)

MAX4002 INPUT IMPEDANCE

vs. FREQUENCY (μMAX)

MAX4000 toc63

FREQUENCY (GHz)

RESISTANCE (Ω)

REACTANCE (Ω)

2.01.51.00.5

500

1000

1500

R

X

2000

2500

0

-400

-300

-200

-100

0

-500

-600

-700

-800

0 2.5

FREQUENCY (GHz) R JXΩ

0.1 2309 -1137

0.9 943 -120

1.9 129 -36

2.5 30 -26

MAX4001 INPUT IMPEDANCE

vs. FREQUENCY (μMAX)

MAX4000 toc62

FREQUENCY (GHz)

RESISTANCE (Ω)

REACTANCE (Ω)

2.01.51.00.5

500

1000

1500

R

X

2000

2500

0

-400

-300

-200

-100

0

-500

-600

-700

-800

0 2.5

FREQUENCY (GHz) R JXΩ

0.1 2144 -1205

0.9 959 -121

1.9 104 -36

2.5 47 -29

MAX4000 INPUT IMPEDANCE

vs. FREQUENCY (μMAX)

MAX4000 toc61

FREQUENCY (GHz)

RESISTANCE (Ω)

REACTANCE (Ω)

2.01.51.00.5

500

1000

1500

R

X

2000

2500

0

-400

-300

-200

-100

0

-500

-600

-700

-800

0 2.5

FREQUENCY (GHz) R JXΩ

0.1 2100 -794

0.9 500 -91

1.9 52 -35

2.5 27 -366

5.04.54.03.53.0

-44

-42

-40

-38

-36

-34

-46

2.5 5.5

MAX4000 toc60

VCC (V)

LOG INTERCEPT (dBm)

MAX4002

LOG INTERCEPT vs. V

CC

(UCSP)

1.9GHz

2.5GHz

0.1GHz

0.9GHz

5.04.54.03.53.02.5 5.5

MAX4000 toc59

-50

-48

-46

-44

-42

-40

-52

V

CC

(V)

LOG INTERCEPT (dBm)

MAX4001

LOG INTERCEPT vs. V

CC

(UCSP)

1.9GHz

2.5GHz

0.1GHz

0.9GHz

5.04.54.03.53.02.5 5.5

MAX4000 toc58

-60

-59

-58

-57

-56

-55

-61

V

CC

(V)

LOG INTERCEPT (dBm)

MAX4000

LOG INTERCEPT vs. V

CC

(UCSP)

1.9GHz

2.5GHz

0.1GHz

0.9GHz

MAX4002

LOG INTERCEPT vs. V

CC

(μMAX)

MAX4000 toc58

VCC (V)

LOG INTERCEPT (dBm)

5.04.54.03.53.0

-45

-43

-41

-39

-37

-35

-33

-47

2.5 5.5

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4001

LOG INTERCEPT vs. V

CC

(μMAX)

MAX4000 toc56

VCC (V)

LOG INTERCEPT (dBm)

5.04.54.03.53.0

-48

-46

-44

-42

-40

-38

-36

-50

2.5 5.5

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4000

LOG INTERCEPT vs. V

CC

(μMAX)

MAX4000 toc55

VCC (V)

LOG INTERCEPT (dBm)

5.04.54.03.53.0

-59

-58

-57

-56

-55

-54

-53

-52

-51

-50

-49

-60

2.5 5.5

2.5GHz

1.9GHz

0.9GHz

0.1GHz

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

______________________________________________________________________________________ 11

Typical Operating Characteristics (continued)

(VCC= 3V, SHDN = VCC, TA= +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem­peratures.)

SUPPLY CURRENT
vs. SHDN VOLTAGE

MAX4000 toc67

SHDN (V)

SUPPLY CURRENT (mA)

1.81.60.2 0.4 0.6 1.0 1.20.8 1.4

0

1

2

3

4

5

6

7

-1

0 2.0

1.2V

V

CC

= 5.5V

SHDN POWER-ON DELAY RESPONSE TIME

MAX4000 toc68

2μs/div

OUT 500mV/div

1.5V/div

SHDN

5μs

SHDN RESPONSE TIME

MAX4000 toc69

2μs/div

OUT 500mV/div

1.5V/div

SHDN

MAX4002 INPUT IMPEDANCE

vs. FREQUENCY (UCSP)

MAX4000 toc66

FREQUENCY (GHz)

RESISTANCE (Ω)

REACTANCE (Ω)

2.01.51.00.5

500

1000

1500

R

X

2000

2500

0

0 2.5

FREQUENCY (GHz) R JXΩ

0.1 1961 -1137

0.9 1130 -120

1.9 315 -36

2.5 163 -26

-400

-300

-200

-100

0

-500

-600

-700

-800

-900

-1000

MAX4000 INPUT IMPEDANCE

vs. FREQUENCY (UCSP)

MAX4000 toc64

FREQUENCY (GHz)

RESISTANCE (Ω)

REACTANCE (Ω)

2.01.51.00.5

500

1000

1500

R

X

2000

2500

0

-400

-300

-200

-100

0

-500

-600

-700

-800

0 2.5

FREQUENCY (GHz) R JXΩ

0.1 1916 -839

0.9 909 -125

1.9 228 -48

2.5 102 -29

MAX4001 INPUT IMPEDANCE

vs. FREQUENCY (UCSP)

MAX4000 toc65

FREQUENCY (GHz)

RESISTANCE (Ω)

REACTANCE (Ω)

2.01.51.00.5

500

1000

1500

R

X

2000

2500

0

-400

-300

-200

-100

0

-500

-600

-700

-800

-900

-1000

0 2.5

FREQUENCY (GHz) R JXΩ

0.1 1942 -927

0.9 1009 -136

1.9 314 -57

2.5 139 -37

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

12 ______________________________________________________________________________________

Pin Description

PIN

NAME

FUNCTION

1 A1 RFIN RF Input

2A2

Shutdown. Connect to VCC for normal operation.

3 A3 SET Set-Point Input for Controller Mode Operation

4 B3 CLPF

Lowpass Filter Connection. Connect external capacitor between CLPF and GND to set
control-loop bandwidth.

5 C3 GND Ground

6 — N.C. No Connection. Not internally connected.

7 C2 OUT Output to PA Gain-Control Pin

8

V

CC

Supply Voltage. VCC = 2.7V to 5.5V.

Typical Operating Characteristics (continued)

(VCC= 3V, SHDN = VCC, TA= +25°C, unless otherwise specified. All log conformance plots are normalized to their respective tem­peratures.)

Block Diagram

BUFFER

GND

OUTPUT-

ENABLE

DELAY

LOG

DETECTOR

x1

V-I*

SHDN

V

CC

RFIN

SET

C

CLPF

OUT

MAX4000
MAX4001
MAX4002

g

m

BLOCK

MAIN OUTPUT NOISE SPECTRAL DENSITY

10

9
8

7
6

5

4

3

2

NOISE SPECTRAL DENSITY (nV/√HZ)

MAX4000 toc70

5.5

5.0

4.5

4.0

3.5

OUT VOLTAGE (V)

3.0

2.5

MAXIMUM OUT VOLTAGE

BY LOAD CURRENT

vs. V

CC

0

5mA

10mA

MAX4000 toc71

1

1k 10k 100k 1M

100 10M

FREQUENCY (Hz)

µMAX UCSP

SHDN

B1, C1

2.0

2.5 5.5
VCC (V)

5.04.54.03.53.0

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

______________________________________________________________________________________ 13

Detailed Description

The MAX4000/MAX4001/MAX4002 family of logarithmic
amplifiers (log amps) is comprised of four main amplifi­er/limiter stages each with a small-signal gain of 10dB.
The output stage of each amplifier is applied to a full­wave rectifier (detector). A detector stage also pre­cedes the first gain stage. In total, five detectors each
separated by 10dB, comprise the log amp strip. Figure
1 shows the functional diagram of the log amps.

A portion of the PA output power is coupled to RFIN of
the log amp controller, and is applied to the log amp
strip. Each detector cell outputs a rectified current and
all cell currents are summed and form a logarithmic
output. The detected output is applied to a high-gain
g

m

stage, which is buffered and then applied to OUT.
OUT is applied to the gain-control pin of the PA to close
the control loop. The voltage applied to SET determines
the output power of the PA in the control loop. The volt­age applied to SET relates to an input power level
determined by the log amp detector characteristics.

Extrapolating a straight-line fit of the graph of SET vs.
RFIN provides the logarithmic intercept. Logarithmic
slope, the amount SET changes for each dB change of
RF input, is generally independent of waveform or ter­mination impedance. The MAX4000/MAX4001/
MAX4002 slope at low frequencies is about 25mV/dB.
Variance in temperature and supply voltage does not
alter the slope significantly as shown in the Typical
Operating Characteristics.

The MAX4000/MAX4001/MAX4002 are specifically des­igned for use in PA control applications. In a control
loop, the output starts at approximately 2.9V (with sup­ply voltage of 3V) for the minimum input signal and falls
to a value close to ground at the maximum input. With a
portion of the PA output power coupled to RFIN, apply
a voltage to SET and connect OUT to the gain-control
pin of the PA to control its output power. An external

capacitor from the CLPF pin to ground sets the band­width of the PA control loop.

Transfer Function

Logarithmic slope and intercept determine the transfer
function of the MAX4000/MAX4001/MAX4002 family of
log amps. The change in SET voltage per dB change in
RF input defines the logarithmic slope. Therefore, a
250mV change at SET results in a 10dB change at
RFIN. The Log-Conformance plots (see Typical Oper-
ating Characteristics) show the dynamic range of the
log amp family. Dynamic range is the range for which
the error remains within a band of ±1dB.

The intercept is defined as the point where the linear
response, when extrapolated, intersects the y-axis of
the Log-Conformance plot. Using these parameters,
the input power can be calculated at any SET voltage
level within the specified input range with the following
equation:

where SET is the set-point voltage, SLOPE is the loga­rithmic slope (V/dB), RFIN is in either dBm or dBV and
IP is the logarithmic intercept point utilizing the same
units as RFIN.

Applications Information

Controller Mode

Figure 2 provides a circuit example of the MAX4000/
MAX4001/MAX4002 configured as a controller. The
MAX4000/MAX4001/MAX4002 require a 2.7V to 5.5V
supply voltage. Place a 0.1µF low-ESR, surface-mount
ceramic capacitor close to V

CC

to decouple the supply.
Electrically isolate the RF input from other pins (espe­cially SET) to maximize performance at high frequencies
(especially at the high-power levels of the MAX4002).
The MAX4000 has an internal input-coupling capacitor

RFIN

SET

SLOPE

IP=+

Figure 1. Functional Diagram

V

CC

OUT

N.C.

GNDCLPF

SET

RFIN

MAX4000

SHDN

DAC

RF INPUT

V

CC

V

CC

XX

POWER AMPLIFIER

ANTENNA

50Ω

C

F

0.1μF

Figure 2. Controller Mode Application Circuit Block

10dB

DET

10dB 10dB10dB

DET

DET DETDET

OFFSET

COMP

LOW­NOISE

BANDGAP

OUTPUT
ENABLE

DELAY

GND

(PADDLE)

gm

-

+

X1

V-I

RFIN

V

CC

SHDN

OUT

CLPF

SET

MAX4000

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

14 ______________________________________________________________________________________

and does not require external AC-coupling. Achieve
50Ω input matching by connecting a 50Ω resistor
between RFIN and ground. See the Typical Operating
Characteristics section for a plot of Input Impedance vs.
Frequency. See the Additional Input Coupling section
for other coupling methods.

The MAX4000/MAX4001/MAX4002 log amps function
as both the detector and controller in power-control
loops. Use a directional coupler to couple a portion of
the PA’s output power to the log amp’s RF input. In
applications requiring dual-mode operation where there
are two PAs and two directional couplers, passively
combine the outputs of the directional couplers before
applying to the log amp. Apply a set-point voltage to
SET from a controlling source (usually a DAC). OUT,
which drives the automatic gain-control pin of the PA,
corrects any inequality between the RF input level and
the corresponding set-point level. This is valid assum­ing the gain control of the variable gain element is posi­tive, such that increasing OUT voltage increases gain.
OUT voltage can range from 150mV to within 250mV of
the supply rail while sourcing 10mA. Use a suitable
load resistor between OUT and GND for PA control
inputs that source current. The Typical Operating
Characteristics section has a plot of the sourcing capa­bilities and output swing of OUT.

SHDN

and Power-On

The MAX4000/MAX4001/MAX4002 can be placed in
shutdown by pulling SHDN to ground. SHDN reduces
supply current to typically 13µA. A graph of SHDN
Response is included in the Typical Operating
Characteristics section. Connect SHDN and V

CC

together for continuous on-operation.

Power Convention

Expressing power in dBm, decibels above 1mW, is the
most common convention in RF systems. Log amp
input levels specified in terms of power are a result of
following common convention. Note that input power
does not refer to power, but rather to input voltage rela­tive to a 50Ω impedance. Use of dBV, decibels with
respect to a 1V

RMS

sine wave, yields a less ambiguous
result. The dBV convention has its own pitfalls in that
log amp response is also dependent on waveform. A
complex input such as CDMA does not have the exact
same output response as the sinusoidal signal. The
MAX4000/MAX4001/MAX4002 performance specifica­tions are in both dBV and dBm, with equivalent dBm
levels for a 50Ω environment. To convert dBV values
into dBm in a 50Ω network, add 13dB.

Filter Capacitor and Transient Response

In general, the choice of filter capacitor only partially
determines the time-domain response of a PA control
loop. However, some simple conventions can be
applied to affect transient response. A large filter
capacitor, C

F

, dominates time-domain response, but
the loop bandwidth remains a factor of the PA gain­control range. The bandwidth is maximized at power
outputs near the center of the PA’s range, and mini­mized at the low and high power levels, where the
slope of the gain-control curve is lowest.

A smaller valued C

F

results in an increased loop band­width inversely proportional to the capacitor value.
Inherent phase lag in the PA’s control path, usually
caused by parasitics at the OUT pin, ultimately results
in the addition of complex poles in the AC loop equa­tion. To avoid this secondary effect, experimentally
determine the lowest usable C

F

for the power amplifier
of interest. This requires full consideration to the intrica­cies of the PA control function. The worst-case condi­tion, where the PA output is smallest (gain function is
steepest), should be used because the PA control
function is typically nonlinear. An additional zero can
be added to improve loop dynamics by placing a resis­tor in series with C

F

. See Figure 3 for the gain and

phase response for different C

F

values.

Additional Input Coupling

There are three common methods for input coupling:
broadband resistive, narrowband reactive, and series
attenuation. A broadband resistive match is implemented
by connecting a resistor to ground at RFIN as shown in
Figure 4a. A 50Ω resistor (use other values for different
input impedances) in this configuration in parallel with the
input impedance of the MAX4000 presents an input

GAIN AND PHASE vs. FREQUENCY

MAX4000 fig03

FREQUENCY (Hz)

GAIN (dB)

PHASE (DEGREES)

10M1M10k 100k1k100

-80

-60

-40

-20

0

20

40

60

80

-100

-180

-135

-90

-45

0

45

90

135

180

-225

10 100M

GAIN

PHASE

CF = 2000pF

CF = 2000pF

CF = 200pF

CF = 200pF

Figure 3. Gain and Phase vs. Frequency Graph

impedance of approximately 50Ω. See the Typical
Operating Characteristics for the input impedance plot to

determine the required external termination at the fre­quency of interest. The MAX4001/MAX4002 require an
additional external coupling capacitor in series with the
RF input. As the operating frequency increases over
2GHz, input impedance is reduced, resulting in the need
for a larger-valued shunt resistor. Use a Smith Chart for
calculating the ideal shunt resistor value.

For high frequencies, use narrowband reactive coupling.
This implementation is shown in Figure 4b. The matching
components are drawn as reactances since these can
be either capacitors or inductors depending on the input
impedance at the desired frequency and available stan­dard value components. A Smith Chart is used to obtain
the input impedance at the desired frequency and then
matching reactive components are chosen. Table 1 pro­vides standard component values at some common fre­quencies for the MAX4001. Note that these inductors
must have a high SRF (self-resonant frequency), much
higher than the intended frequency of operation to imple­ment this matching scheme.

Device sensitivity is increased by the use of a reactive
matching network, because a voltage gain occurs
before being applied to RFIN. The associated gain is
calculated with the following equation:

where R1 is the source impedance to which the device
is being matched, and R2 is the input resistance of the
device. The gain is the best-case scenario for a perfect
match. However, component tolerance and standard
value choice often result in a reduced gain.

Figure 4c demonstrates series attenuation coupling.
This method is intended for use in applications where
the RF input signal is greater than the input range of the
device. The input signal is thus resistively divided by
the use of a series resistor connected to the RF source.
Since the MAX4000/MAX4001/MAX4002 log amps offer
a wide selection of RF input ranges, series attenuation
coupling is not needed for typical applications.

Voltage Gain

R
R

dB

log= 20

2

1

10

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

______________________________________________________________________________________ 15

Table 1. Suggested Components for
MAX4001 Reactive Matching Network

(GHz)

j

X1

(nH) j

X2

(nH)

VOLTAGE

GAIN (dB)

0.9 38 47 12.8

1.9 4.4 4.7 3.2

2.5 — 1.8 -0.3

Figure 4a. Broadband Resistive Matching

MAX4000
MAX4001
MAX4002

50Ω SOURCE

50Ω

C

C

** CC*

C

IN

R

IN

V

CC

*MAX4000 ONLY INTERNALLY COUPLED
**MAX4001/MAX4002 REQUIRE EXTERNAL COUPLING

RFIN

j

X1

j

X2

Figure 4b. Narrowband Reactive Matching

MAX4000
MAX4001
MAX4002

R

ATTN

CC** CC*

C

IN

R

IN

V

CC

*MAX4000 ONLY INTERNALLY COUPLED
**MAX4001/MAX4002 REQUIRE EXTERNAL COUPLING

RFIN

STRIPLINE

Figure 4c. Series Attenuation Network

50Ω SOURCE

50Ω

R

S

50Ω

*MAX4000 ONLY INTERNALLY COUPLED
**MAX4001/MAX4002 REQUIRE EXTERNAL COUPLING

** CC*

C

C

RFIN

MAX4000
MAX4001
MAX4002

C

IN

V

CC

R

IN

FREQUENCY

MAX4000/MAX4001/MAX4002

Waveform Considerations

The MAX4000/MAX4001/MAX4002 family of log amps
respond to voltage, not power, even though input levels
are specified in dBm. It is important to realize that input
signals with identical RMS power but unique waveforms
results in different log amp outputs.

Differing signal waveforms result in either an upward or
downward shift in the logarithmic intercept. However,
the logarithmic slope remains the same.

Layout Considerations

As with any RF circuit, the layout of the MAX4000/
MAX4001/MAX4002 circuits affects performance. Use a
short 50Ω line at the input with multiple ground vias
along the length of the line. The input capacitor and
resistor should both be placed as close to the IC as
possible. V

CC

should be bypassed as close as possi­ble to the IC with multiple vias connecting the capacitor
to the ground plane. It is recommended that good RF
components be chosen for the desired operating fre­quency range. Electrically isolate RF input from

other pins (especially SET) to maximize perfor­mance at high frequencies (especially at the high
power levels of the MAX4002).

UCSP Reliability

The UCSP represents a unique package that greatly
reduces board space compared to other packages.
UCSP reliability is integrally linked to the user’s assem­bly methods, circuit board material, and usage environ­ment. The user should closely review these areas when
considering use of a UCSP. This form factor may not
perform equally to a packaged product through tradi­tional mechanical reliability tests. Performance through
operating life test and moisture resistance remains
uncompromised as it is primarily determined by the
wafer fabrication process. Mechanical stress perform­ance is a greater consideration for a UCSP. UCSP sol­der joint contact integrity must be considered since the
package is attached through direct solder contact to
the user’s PCB. Testing done to characterize the UCSP
reliability performance shows that it is capable of per­forming reliably through environmental stresses.
Results of environmental stress tests and additional
usage data and recommendations are detailed in the
UCSP application note, which can be found on Maxim’s
website, www.maxim-ic.com.

2.5GHz 45dB RF-Detecting Controllers

16 ______________________________________________________________________________________

Pin Configurations

1

2

3

4

8

7

6

5

V

CC

OUT

N.C.

GNDCLPF

A

123

B

C

SET

SHDN

RFIN

MAX4000
MAX4001
MAX4002

μMAX

TOP VIEW

RFIN SET

V

CC

CLPF

V

CC

OUT GND

SHDN

MAX4000
MAX4001
MAX4002

UCSP

TOP VIEW
(BUMPS ON BOTTOM)

Chip Information

TRANSISTOR COUNT: 358

PROCESS: Bipolar

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

______________________________________________________________________________________ 17

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

.)

9LUCSP, 3x3.EPS

PACKAGE OUTLINE, 3x3 UCSP

1

21-0093

L

1

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

18 ______________________________________________________________________________________

8LUMAXD.EPS

PACKAGE OUTLINE, 8L uMAX/uSOP

1

1

21-0036

J

REV.DOCUMENT CONTROL NO.APPROVAL

PROPRIETARY INFORMATION

TITLE:

MAX

0.043

0.006

0.014

0.120

0.120

0.198

0.026

0.007

0.037

0.0207 BSC

0.0256 BSC

A2

A1

c

e

b

A

L

FRONT VIEW

SIDE VIEW

E H

0.6±0.1

0.6±0.1

Ø0.50±0.1

1

TOP VIEW

D

8

A2

0.030

BOTTOM VIEW

1

6°

S

b

L

H

E

D
e

c

0°

0.010

0.116

0.116

0.188

0.016

0.005

8

4X S

INCHES

-

A1

A

MIN

0.002

0.950.75

0.5250 BSC

0.25 0.36

2.95 3.05

2.95 3.05

4.78

0.41

0.65 BSC

5.03

0.66
6°0°

0.13 0.18

MAX

MIN

MILLIMETERS

- 1.10

0.05 0.15

α

α

DIM

Package Information (continued)

(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

.)

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

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 ____________________ 19

© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

Revision History

REVISION

NUMBER

REVISION

DATE

DESCRIPTION

PAGES

CHANGED

1 7/02 — —

2 12/07 Insertion/correction of figures and text changes. 1, 4–13, 16