Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX4001EUA+

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 fre-

quency range. A typical dynamic range of 45dB makes

this family of log amps useful in a variety of wireless appli-

cations 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 elimi-

nates the need for external attenuators, thus simplifying

PA control-loop design. The logarithmic amplifier is a volt-

age-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 capaci-

tor 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 glitch-

free controller output.

The MAX4000/MAX4001/MAX4002 family is available in

an 8-pin µMAX

package and an 8-bump chip-scale

package (UCSP™). The device consumes 5.9mA with a

5.5V supply, and when powered down the typical shut-

down current is 13µA.

Applications

Transmitter Power Measurement and Control

TSSI for Wireless Terminal Devices

Cellular Handsets (TDMA, CDMA, GPRS, GSM)

RSSI for Fiber Modules

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

UCSP is a trademark of Maxim Integrated Products, Inc.

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

MAX4000/MAX4001/MAX4002

2.5GHz 45dB RF-Detecting Controllers

________________________________________________________________ Maxim Integrated Products 1

19-2288; Rev 2; 12/07

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.

Ordering Information

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4000EBL-T -40°C to +85°C 8 UCSP-8

ABF

MAX4000EUA -40°C to +85°C 8 µMAX

—

MAX4001EBL-T -40°C to +85°C 8 UCSP-8

ABE

MAX4001EUA -40°C to +85°C 8 µMAX

—

MAX4002EBL-T -40°C to +85°C 8 UCSP-8

ABD

MAX4002EUA -40°C to +85°C 8 µMAX

—

Functional Diagram

10dB

DET

10dB 10dB10dB

DET

DET DETDET

OFFSET

COMP

LOW-

NOISE

BANDGAP

OUTPUT

ENABLE

DELAY

GND

(PADDLE)

V-I

RFIN

SHDN

OUT

CLPF

SET

MAX4000

Pin Configurations appear at end of data sheet.

Summary of content (19 pages)

PAGE 1
9-2288; Rev 2; 12/07 2.5GHz 45dB RF-Detecting Controllers 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.
PAGE 2
MAX4000/MAX4001/MAX4002 2.5GHz 45dB RF-Detecting Controllers ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to GND) VCC ...........................................................................-0.3V to +6V OUT, SET, SHDN, CLPF .............................-0.3V to (VCC + 0.3V) RFIN MAX4000 ......................................................................+6dBm MAX4001 ....................................................................+16dBm MAX4002 ....................................................
PAGE 3
2.5GHz 45dB RF-Detecting Controllers (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 SYMBOL RF Input Frequency fRF RF Input Voltage Range (Note 4) VRF Equivalent Power Range (50Ω Terminated) (Note 4) Logarithmic Slope PRF VS CONDITIONS MAX UNITS 100 2500 MHz MAX4000 -58 -13 MAX4001 -48 -3 MAX4002 -43 +2 MAX4000 -45 0 MAX4001 -35 +10 MAX4002 -30 +15 fRF = 100MHz PX TYP 22.
PAGE 4
Typical Operating Characteristics (VCC = 3V, SHDN = VCC, TA = +25°C, unless otherwise specified. All log conformance plots are normalized to their respective temperatures.) 2.5GHz 1.4 0.9GHz 1.2 0.9GHz 1.0 0.1GHz 0.8 0.1GHz 0.8 0.6 0.6 0.4 0.4 0.4 0.2 -50 -40 -30 -20 -10 0 10 0.2 -50 -40 -30 -20 -10 0 10 20 -40 0 10 20 MAX4000 SET vs. INPUT POWER (UCSP) MAX4001 SET vs. INPUT POWER (UCSP) MAX4002 SET vs. INPUT POWER (UCSP) 1.6 0.1GHz 1.4 1.9GHz 1.4 1.2 SET (V) 0.
PAGE 5
2.5GHz 45dB RF-Detecting Controllers (VCC = 3V, SHDN = VCC, TA = +25°C, unless otherwise specified. All log conformance plots are normalized to their respective temperatures.) 0.1GHz MAX4000 toc12 3 2 2 4 MAX4000 toc11 3 3 2.5GHz 0.1GHz 2 0.9GHz 2.5GHz 0.9GHz 1 0 ERROR (dB) 1 ERROR (dB) ERROR (dB) 4 MAX4000 toc10 4 MAX4002 LOG CONFORMANCE vs. INPUT POWER (UCSP) MAX4001 LOG CONFORMANCE vs. INPUT POWER (UCSP) MAX4000 LOG CONFORMANCE vs. INPUT POWER (UCSP) 0 -1 -1 0.1GHz 1.
PAGE 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.) 1.4 2 1.4 1 1.0 0 TA = +85°C 0.8 1.2 SET (V) -1 0 0.8 -2 0.2 -10 0 -3 0.4 -4 10 0.2 -40 -30 -20 -10 0 0 1.0 -1 0.8 -2 0.6 -1 -2 TA = -40°C 10 -3 0.4 -4 20 0.2 -3 -35 -25 -15 -5 5 15 -4 25 INPUT POWER (dBm) INPUT POWER (dBm) MAX4000 SET AND LOG CONFORMANCE vs. INPUT POWER AT 0.
PAGE 7
2.5GHz 45dB RF-Detecting Controllers (VCC = 3V, SHDN = VCC, TA = +25°C, unless otherwise specified. All log conformance plots are normalized to their respective temperatures.) TA = -40°C 1.6 2 1.4 1 1.0 0 TA = +85°C TA = +25°C TA = -40°C 1.2 1.0 1 1.2 0.6 -2 TA = -40°C 0.8 -1 -2 0.6 -2 TA = -40°C 0.4 -3 0.4 -4 10 0.2 -4 20 0.2 -20 1 -1 -3 -30 TA = -40°C 0 0.2 -40 2 1.0 0.4 -50 3 TA = +25°C TA = +25°C 0.
PAGE 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.) MAX4001 LOG SLOPE vs. FREQUENCY (μMAX) TA = +25°C 28 TA = -40°C 29 28 TA = +25°C 27 26 TA = -40°C 28 26 25 24 23 1.5 2.0 24 0 2.5 0.5 1.0 1.5 2.0 2.5 0 1.0 1.5 2.5 2.0 FREQUENCY (GHz) FREQUENCY (GHz) MAX4000 LOG SLOPE vs. FREQUENCY (UCSP) MAX4001 LOG SLOPE vs. FREQUENCY (UCSP) MAX4002 LOG SLOPE vs.
PAGE 9
2.5GHz 45dB RF-Detecting Controllers (VCC = 3V, SHDN = VCC, TA = +25°C, unless otherwise specified. All log conformance plots are normalized to their respective temperatures.) MAX4001 LOG SLOPE vs. VCC (UCSP) 1.9GHz 27 31 0.1GHz 26 0.1GHz 3.0 3.5 4.0 4.5 5.0 1.9GHz 27 0.1GHz 25 0.9GHz 23 2.5 29 0.9GHz 0.9GHz 24 5.5 23 2.5 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VCC (V) VCC (V) VCC (V) MAX4000 LOG INTERCEPT vs. FREQUENCY (μMAX) MAX4001 LOG INTERCEPT vs.
PAGE 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.) LOG INTERCEPT (dBm) -52 -53 -54 0.1GHz -55 -56 1.9GHz -57 -40 -42 -44 1.9GHz -46 2.5GHz -37 -39 0.1GHz -41 1.9GHz -43 0.1GHz -45 -48 0.9GHz -59 0.9GHz 0.9GHz -47 -50 -60 3.0 3.5 4.0 4.5 5.0 2.5 5.5 3.0 3.5 4.0 4.5 5.0 2.5 5.5 3.0 3.5 4.0 4.5 VCC (V) VCC (V) MAX4000 LOG INTERCEPT vs.
PAGE 11
2.5GHz 45dB RF-Detecting Controllers (VCC = 3V, SHDN = VCC, TA = +25°C, unless otherwise specified. All log conformance plots are normalized to their respective temperatures.) MAX4001 INPUT IMPEDANCE vs. FREQUENCY (UCSP) MAX4000 INPUT IMPEDANCE vs. FREQUENCY (UCSP) -100 X FREQUENCY (GHz) R JXΩ 0.1 1916 -839 0.9 909 -125 1.9 228 -48 2.5 102 -29 -200 -300 -400 1000 -500 -200 FREQUENCY (GHz) R JXΩ 0.1 1942 -927 0.9 1009 -136 1.9 314 -57 2.
PAGE 12
Typical Operating Characteristics (continued) (VCC = 3V, SHDN = VCC, TA = +25°C, unless otherwise specified. All log conformance plots are normalized to their respective temperatures.) MAXIMUM OUT VOLTAGE MAIN OUTPUT NOISE SPECTRAL DENSITY vs. VCC BY LOAD CURRENT 5.5 MAX4000 toc71 10 9 8 7 6 5 MAX4000 toc70 5.0 0 4.5 OUT VOLTAGE (V) NOISE SPECTRAL DENSITY (nV/√HZ) MAX4000/MAX4001/MAX4002 2.5GHz 45dB RF-Detecting Controllers 4 3 5mA 4.0 10mA 3.5 2 3.0 2.5 1 2.0 100 1k 10k 100k 1M 10M 2.
PAGE 13
2.5GHz 45dB RF-Detecting Controllers OUTPUT ENABLE DELAY SHDN VCC DET DET DET DET DET POWER AMPLIFIER gm + X1 OUT 50Ω CLPF RFIN 10dB 10dB 10dB RFIN MAX4000 VCC 10dB V-I LOWNOISE BANDGAP OFFSET COMP RF INPUT XX SET VCC SHDN DAC MAX4000 GND (PADDLE) OUT SET N.C. CLPF GND VCC 0.1μF CF Figure 1.
PAGE 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. 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.
PAGE 15
2.5GHz 45dB RF-Detecting Controllers 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.
PAGE 16
MAX4000/MAX4001/MAX4002 2.5GHz 45dB RF-Detecting Controllers Waveform Considerations UCSP Reliability 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.
PAGE 17
2.5GHz 45dB RF-Detecting Controllers 9LUCSP, 3x3.EPS PACKAGE OUTLINE, 3x3 UCSP 21-0093 L 1 1 ______________________________________________________________________________________ 17 MAX4000/MAX4001/MAX4002 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.
PAGE 18
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.) 4X S 8 E Ø0.50±0.1 8 INCHES DIM A A1 A2 b H c D e E H 0.6±0.1 1 L 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6° 0° 0.0207 BSC 8LUMAXD.EPS MAX4000/MAX4001/MAX4002 2.
PAGE 19
2.5GHz 45dB RF-Detecting Controllers REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 1, 4–13, 16 1 7/02 — 2 12/07 Insertion/correction of figures and text changes. — 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.