General Description

The MAX9930–MAX9933 low-cost, low-power logarith-

mic amplifiers are designed to control RF power ampli-

fiers (PA) and transimpedance amplifiers (TIA), and to

detect RF power levels. These devices are designed to

operate in the 2MHz to 1.6GHz frequency range. A typi-

cal dynamic range of 45dB makes this family of logarith-

mic amplifiers useful in a variety of wireless and GPON

fiber video applications such as transmitter power mea-

surement, and RSSI for terminal devices. Logarithmic

amplifiers provide much wider measurement range and

superior accuracy to controllers based on diode detec-

tors. Excellent temperature stability is achieved over the

full operating range of -40°C to +85°C.

The choice of three different input voltage ranges elimi-

nates 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 MAX9930/MAX9933, -48dBV

to -3dBV for the MAX9931, and -43dBV to +2dBV for

the MAX9932.

The MAX9930–MAX9933 require an external coupling

capacitor in series with the RF input port. These devices

feature a power-on delay when coming out of shutdown,

holding OUT low for approximately 2.5µs to ensure

glitch-free controller output.

The MAX9930–MAX9933 family is available in an 8-pin

5V supply, and when powered down, the typical shut-

down current is 13µA.

Applications

RSSI for Fiber Modules, GPON-CATV Triplexors

Low-Frequency RF OOK and ASK Applications

Transmitter Power Measurement and Control

TSI for Wireless Terminal Devices

Cellular Handsets (TDMA, CDMA, GPRS, GSM)

Features

o Complete RF-Detecting PA Controllers

(MAX9930/MAX9931/MAX9932)

o Complete RF Detector (MAX9933)

o Variety of Input Ranges

MAX9930/MAX9933: -58dBV to -13dBV

(-45dBm to 0dBm for 50Ω Termination)

MAX9931: -48dBV to -3dBV

(-35dBm to +10dBm for 50Ω Termination)

MAX9932: -43dBV to +2dBV

(-30dBm to +15dBm for 50Ω Termination)

o 2MHz to 1.6GHz Frequency Range

o Temperature Stable Linear-in-dB Response

o Fast Response: 70ns 10dB Step

o 10mA Output Sourcing Capability

o Low Power: 17mW at 3V (typ)

o 13µA (typ) Shutdown Current

o Available in a Small 8-Pin µMAX Package

2MHz to 1.6GHz 45dB RF-Detecting

Controllers and RF Detector

________________________________________________________________

Maxim Integrated Products

1

MAX9930

MAX9931

MAX9932

+

1

2

3

4

OUT

N.C.

GND

TOP VIEW

RFIN

SHDN

SET

CLPF

8

7

6

5

µMAX

MAX9933

+

1

2

3

4

OUT

N.C.

GND

RFIN

SHDN

GND

CLPF

8

7

6

5

µMAX

Pin Configurations

19-0859; Rev 0; 8/07

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.

EVALUATION

KIT

AVAILABLE

Block Diagram located at end of data sheet.

Ordering Information

+

Denotes a lead-free package.

T = Tape and reel.

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX9930EUA+T

-40

8 µMAX-8

U8-1

MAX9931EUA+T

-40

8 µMAX-8

U8-1

MAX9932EUA+T

-40

8 µMAX-8

U8-1

MAX9933EUA+T

-40

8 µMAX-8

U8-1

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