High-dynamic-range downconverting mixers consume up to 0.66 W

High-dynamic-range downconverting mixers consume up to 0.66 W

Covering the 700-MHz to 4-GHz wireless infrastructure frequency range, the LTC5540, LTC5541, LTC5542, and LTC5543 family of downconverting mixers offers an IIP3 of 26 dBm, low-noise figures of 9 to 10 dB and high conversion gain of 8 dB — enabling excellent dynamic range performance for both main receivers and digital predistortion receivers. Unlike other mixers in their class, the LTC554x family is said to operate on a single 3.3-V supply without compromising performance, while reducing power consumption by 34% over the closest competing solution. The LTC5540/2/3 consume 0.66 W, and the LTC5541 consumes 0.63 W.

The mixers satisfy the requirements of nascent fourth-generation LTE cellular and WiMAX base stations, as well as 3G CDMA, WCDMA, TD-SCDMA, UMTS, and GSM/EDGE platforms. They contain an integrated IF amplifier, LO buffer, LO switch, and RF balun transformers.

Each mixer’s RF input is single ended, 50-Ω matched. Two single-ended LO inputs with high isolation are provided for frequency-hopping applications. Each LO input is also single ended, always 50-Ω matched regardless of whether the mixer is active or powered down to avoid unlocking of the PLL. The LO input requires only 0-dBm drive level.

Housed in 20-lead QFN surface-mount packages, the devices have a power-down feature with turn-on and turn-off time of 2 and 3 µs, respectively. When disabled, the ICs consume a maximum of 500 µA. (From $6.50 — samples available now, prod qty, February 2010.)

Linear Technology , Milpitas , CA
Information 408-432-1900
http://www.linear.com