The LTC5548 is a high performance, microwave double balanced passive mixer that can be used for frequency up-conversion or down-conversion. It has a broadband, differential DC to 6GHz IF port and is recommended for applications where the IF frequency range extends below 500MHz. The LTC5548’s mixer and integrated RF balun are optimized to cover the 2GHz to 14GHz RF frequency range. The device delivers exceptionally high IIP3 and P1dB, in addition to very low LO to RF and LO to IF leakages and offers high integration in a small package.
The LTC5548 from Linear Technology, now part of Analog Devices, is a double balanced mixer that operates either as an up- or down-converter with an exceptionally wide frequency range from 2GHz to 14GHz. This device features integrated balun transformers at the RF and LO ports, providing 50O match from 2GHz to 13.6GHz and from 1GHz to 12GHz at each port, respectively, while enabling single-ended operation. Additionally, the IF port is capable of DC to 6GHz, supporting wideband transmitters and receivers at the baseband. The LTC5548 has high linearity of 24.4dBm IIP3 at 5.8GHz, and 21.4dBm at 9GHz.
This mixer simplifies microwave transmitter and receiver designs with its integrated LO buffer, requiring only a 0dBm drive, effectively eliminating an external high power LO amplifier circuit. Moreover, the LTC5548 has a selectable on-chip LO frequency doubler, enabling the device to use lower cost, commonly available low frequency synthesizers. This integrated LO frequency doubler can easily be enabled or disabled with a CMOS-compatible control pin. The LTC5548 mixer features exceptional port-to-port isolation, minimizing undesirable LO leakage, easing external filtering requirements.
The performance of the LTC5548 is ideal for a wide range of microwave applications, including broadband microwave backhaul, the emerging 5.8GHz unlicensed band and 14GHz LTE-Advanced broadband wireless services, satellite broadband transceivers, radar systems, X-band and Ku band transceivers, spectrum analyzers, RF test equipment and satellite modems.
The LTC5548 has exceptionally robust ESD handling capability of 2,000V ESD human body model (HBM) rating on all pins. The device comes in a tiny 12-lead 3mm x 2mm plastic QFN package, providing a compact solution footprint, requiring minimal external components. The device is rated for operation from –40°C to 105°C case temperature.
The mixer is powered from a single 3.3V supply, drawing a nominal supply current of 120mA and additionally it has an enable pin to shut down the IC. When deactivated, the device draws only 100µA maximum standby current. The enable pin can be driven directly to turn the device on and off rapidly in less than 0.2µs, supporting time-division duplex (TDD) or burst mode type radios.
The LTC5548 is priced starting at $9.50 each in 1,000-piece quantities. Samples and production quantities are available immediately.
The USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.
For more information, visit www.linear.com/product/LTC5548
Summary of Features of the LTC5548:
- Operating RF Frequency 2GHz to 14GHz
- Upconversion or Downconversion
- IF Frequency Range DC to 6GHz
-
High Input IP3: +24.4dBm at 5.8GHz
+21.4dBm at 9GHz - 7.1dB Conversion Loss at 5.8GHz
- +15.2dBm Input P1dB at 5.8GHz
- SSB Noise Figure of 8dB
- Integrated LO Buffer: 0dBm LO Drive
- Selectable Integrated LO Frequency Doubler
- Low LO-RF Leakage: <–30dBm
- 50O Wideband Matched RF and LO Ports
- 3.3V/120mA Supply
- Fast Turn ON/OFF for TDD Operation
- 3mm × 2mm, 12-Lead QFN Package
Typical Application
Applications
- Microwave Transceivers
- Wireless Backhaul
- Point-to-Point Microwave
- Phased-Array Antennas
- C, X and Ku Band RADAR
- Test Equipment
- Satellite MODEMs
Linear Technology (UK) Limited
(Now part of Analog Devices)
Tel: +44 (0)1628 477066
E-mail: uksales@linear.com
Web site: www.linear.com
Website for product information: http://www.linear.com/product/LTC5548
