19-2620; Rev 1; 3/03
100MHz to 2500MHz, 45dB RF Detector
in a UCSP
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.
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 2kΩ 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.
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.
Cellular Handsets (TDMA, CDMA, GPRS, GSM)
TSSI for Wireless Terminal Devices
Transmitter Power Measurement and Control
RSSI for Fiber Modules
UCSP is a trademark of Maxim Integrated Products, Inc.
♦ Complete RF Detector
♦ Frequency Range from 100MHz to 2500MHz
♦ Input Range of -58dBV to -13dBV
(-45dBm to 0dBm into 50Ω)
♦ Fast Response: 70ns in 10dB Steps
♦ Low-Current Consumption: 5.9mA at VCC = 3.0V
♦ 13µA (typ) Shutdown Current
♦ Available in 8-Bump UCSP or 8-Pin µMAX and
Thin QFN Packages
-40°C to +85°C 8 UCSP-8
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 Thin QFN-EP ADG
(BUMPS ON BOTTOM)
B VCC MAX4003 CLPF
C VCC OUT GND
Pin Configurations continued at end of data sheet.
DET DET DET DET DET -
10dB 10dB 10dB 10dB
________________________________________________________________ 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.