LTC554x mixers satisfy needs of WiMAX basestations
Linear Technologycontact supplier
LTC554x mixers are designed to satisfy the requirements of nascent fourth-generation LTE cellular and WiMAX basestations, as well as 3G CDMA, WCDMA, TD-SCDMA, UMTS and GSM/EDGE platforms.
The series of four high-dynamic-range downconverting mixers covering the 700MHz to 4GHz wireless infrastructure frequency range.
The LTC554x mixers offer IIP3 (input third-order intercept) of 26dBm, low noise figures of 9-10dB and high conversion gain of 8dB, enabling high dynamic range performance for main receivers and digital predistortion receivers.
The mixers maintain a low noise figure in the presence of strong blocking interferers, enhancing receiver sensitivity and robustness.
The LTC554x range operates on a single 3.3V supply without compromising performance, while reducing power consumption by 34 per cent compared with the closest competing solution - according to the company.
The mixers' robust performance is said to enhance 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 and 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.
The LTC554x mixers have identical pinouts, allowing designers to share PC board layouts across multiple platforms operating in different frequency bands.
This helps users reduce total ownership costs and speed time to market.
The mixers' pinouts are also similar to common industry footprints and pinouts, allowing ease of adoption while improving performance and reducing power consumption.
The LTC554x mixers operate on a single 3.3V supply, drawing a supply current of 200mA.
The devices have a power-down feature with turn-on and turn-off time of 2us and 3us, respectively.
When disabled, the ICs consume a maximum of 500uA.
The products are offered in a 20-lead, 5 x 5mm QFN surface-mount package.
Linear Technology and Arrow Electronics are set to present the ‘LTspice World Circuit’ seminar series. Designed to educate and inform both advanced and new users of LTspice, the seminars are being held in Reading on 6 October, Cambridge on 7 October, Edinburgh on 8 October and Dublin on 9 October.
The LTC5599 low-power I/Q modulator from Linear Technology enables battery-powered transmitters operating in the 30MHz to 1.3GHz frequency bands, which reportedly breaks new ground in power consumption, sideband suppression, carrier leakage and dynamic range performance.
Linear Technology has introduced the LT3062: a high-voltage, low-noise, low-dropout-voltage linear regulator. The IC delivers up to 200mA continuous output current with a 300mV dropout voltage at full load.
Linear Technology has introduced the LTC2645: a quad-channel 12-bit/10-bit/8-bit PWM-to-voltage-output digital-to-analogue converter (DAC) with 10ppm/oC reference. These parts convert PWM input signals to 12-bit accurate, stable, buffered voltage outputs in less than 8µsec, eliminating the ripple and delay typically associated with analogue filters.
Photomultipliers (PMTs), avalanche photodiodes (APDs), ultrasonic transducers, capacitance microphones, radiation detectors and similar devices require high-voltage, low-current bias. Additionally, the high voltage must be pristinely free of noise. This application note from Linear Technology describes a variety of circuits featuring outputs from 200V to 1,000V with output noise below 100µV measured in a 100MHz bandwidth.