MAX2203, Maxim, RMS power detector
MAX2203: Industry's most accurate RMS power detector, regardless of modulation
News Release from:
Maxim Integrated Products
10 February 2010
Maxim Integrated Products announces the MAX2203 RMS power detector. Designed to operate from 800MHz to 2.0GHz, the MAX2203 accepts an RF signal at the input, and outputs the same voltage regardless of the peak average of the input signal. This RMS power detector is ideal for WCDMA (wideband code-division multiple access), cdma2000(R), and HSDPA/HSUPA (high-speed downlink/uplink packet access).
Using Maxim's expertise with the SiGe BiCMOS process and wafer-level packaging technology, the MAX2203 offers a repeatable and exceptionally accurate RMS output over temperature and modulation. This future-proof performance means that the MAX2203 is modulation independent. A circuit can now be reused with no additional engineering effort in new end-equipment designs that add modulation schemes.
The output voltage and input power is linear in dB. The device has a -25dBm to +3dBm detection range, and every dB change in input power gives 40mV typical change in output voltage. Boasting 0.1dB typical RMS accuracy from WCDMA modulation change and ±0.5dB detection error due to temperature, the MAX2203 improves closed-loop performance of the transmit path in today's multiband, multimode smartphones, cellular phones, broadband laptop data cards. It can also be used for SAR limiting.
The MAX2203EWT+T operates from a 2.5V to 4.2V supply. Fully specified over the -40 degrees Celsius to +85 degrees Celsius extended temperature range, it is available in an ultra-small, 6-pin WLP. Prices start at $0.50 (1000-up, FOB USA).