19-2620; Rev 1; 3/03
100MHz to 2500MHz, 45dB RF Detector
in a UCSP
General Description
Features
The MAX4003 low-cost, low-power logarithmic amplifier
is designed to detect the power levels of RF power
amplifiers (PAs) operating from 100MHz to 2500MHz. A
typical dynamic range of 45dB makes this logarithmic
amplifier useful in a variety of wireless applications
including cellular handset PA control, TSSI for wireless
terminal devices, and other transmitter power measure-
ments. This logarithmic amplifier provides much wider
measurement range and superior accuracy than typical
diode-based detectors. Excellent temperature stability is
achieved over the full operating range of -40°C to +85°C.
ꢀ Complete RF Detector
ꢀ Frequency Range from 100MHz to 2500MHz
ꢀ Input Range of -58dBV to -13dBV
(-45dBm to 0dBm into 50 )
ꢀ Fast Response: 70ns in 10dB Steps
ꢀ Low-Current Consumption: 5.9mA at V
ꢀ 13µA (typ) Shutdown Current
= 3.0V
CC
ꢀ Available in 8-Bump UCSP or 8-Pin µMAX and
The MAX4003 logarithmic amplifier is a voltage-mea-
suring device with a typical signal range of -58dBV to
-13dBV. The input signal is internally AC-coupled by an
on-chip 5pF capacitor in series with a 2k 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 MAX4003 also
features a power-on delay, which holds the detector
output (OUT) low for approximately 5µs to ensure
glitchless controller output.
Thin QFN Packages
Ordering Information
PIN/BUMP-
PACKAGE
TOP
MARK
PART
TEMP RANGE
MAX4003EBL-T -40°C to +85°C 8 UCSP-8
MAX4003EUA -40°C to +85°C 8 µMAX
MAX4003ETA-T -40°C to +85°C 8 Thin QFN-EP
ABV
—
ADG
Pin Configurations
The MAX4003 is available in an 8-bump chip-scale pack-
age (UCSP™), an 8-pin µMAX package, and an 8-pin thin
QFN package. The device consumes 5.9mA with a 3.0V
supply and only 13µA when the device is in shutdown.
TOP VIEW
(BUMPS ON BOTTOM)
TOP VIEW
1
2
3
RFIN
SHDN
GND
1
2
3
4
V
CC
8
7
6
5
Applications
A
B
C
RFIN
SHDN
GND
OUT
N.C.
GND
Cellular Handsets (TDMA, CDMA, GPRS, GSM)
TSSI for Wireless Terminal Devices
Transmitter Power Measurement and Control
RSSI for Fiber Modules
MAX4003
MAX4003
V
CLPF
GND
CC
CC
CLPF
V
OUT
MAX
UCSP
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations continued at end of data sheet.
Functional Diagram
OUTPUT
ENABLE
DELAY
SHDN
V
CC
+
-
g
1X
OUT
m
DET
DET
DET
DET
DET
CLPF
RFIN
10dB
10dB
10dB
10dB
V-I
LOW-
NOISE
BANDGAP
OFFSET
COMP
MAX4003
GND
________________________________________________________________ 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.