Date: 09/11/2010

New power detector from Maxim with RF step-response time of 140ns

The new power detector MAX2209A from Maxim delivers 140ns (typ) RF step-response time. Maxim claims this is at least twenty times faster than competitive RMS detectors and peak detectors for rapid output-envelope tracking, thus ensuring efficient power amplifier control. The MAX2209A is highly suggested for constant-envelope-modulation schemes (e.g., GMSK used in GSM), as well as nonconstant-envelope-modulation schemes (e.g., QPSK used in WCDMA) that employ high-speed DSP and DAC power-loop control.

MAX2209A consumes 3.9mA (typ) of quiescent current and 25µA (typ) in shutdown and is packed in 1mm² UCSP package. MAX2209A has a power detection range of -25dBm to -5dBm. Part-to-part residual error over temperature is ±0.1dB over the input power range.

Operating temperature range: -40°C to +85°C

Package: 1mm x 1mm, 4-pin UCSP

Price:
MAX2209A: Starts at US$0.56
EV kit: US$50.00