Date: 29/10/2009

700MHz to 4GHz downconverting mixers from Linear for wireless basestations

Linear has announced that its LTC554x family of four new high dynamic range downconverting mixers covering the 700MHz to 4GHz wireless infrastructure frequency range. The LTC554x mixers are suitable for LTE cellular, WiMAX basestations, 3G CDMA, WCDMA, TD-SCDMA, UMTS and GSM/EDGE platforms.

The LTC554x mixers' better performance also enhances other wireless systems such as point-to-point microwave systems, cellular repeaters, public safety radios and military communication systems.

The LTC554x mixers contain an integrated IF amplifier, LO buffer, LO switch and RF balun transformers. Each mixer's RF input is single ended, 50Ohm matched. Two single-ended LO inputs with high isolation are provided for frequency hopping applications. Each LO input is also single ended, always 50Ohm matched regardless of whether the mixer is active or powered down to avoid unlocking of the PLL (Phased-Lock Loop). The LO input requires only 0dBm drive level. All of these features facilitate a compact solution with minimal external components.

The key features of the LTC554x mixers are,

Optimized for 1.3GHz to 2.3GHz RF applications
Conversion gain of 7.8dB, IIP3 (input third-order intercept) of 26.4dBm, 9.6dB of noise figure at 1950MHz
Configurable for 13dBm Input P1dB
Operating input voltage of 3.3V, drawing a supply current of 200mA
630mW of power consumption
Shutdown pin
50 Ohms of single-ended RF and LO inputs
LO inputs 50 Ohms matched when shutdown
High isolation LO switch
0dBm LO drive level
High LO-RF and LO-IF isolation
Power-down feature with turn-on and turn-off time of 2us and 3us, respectively.
When disabled, the ICs consume a maximum of 500uA

Package: 20-Lead (5mm × 5mm) QFN package
Price:
LTC5541: Starts at each $6.50
Availability: Production will begin in November 2009

For more details visit www.linear.com

Editorial product rating: Average