Maxim releases MAX2051 SiGe passive mixer
Maxim Integrated Products
MAX2051 passive mixer
Maxim Integrated Products' MAX2051 is a high-performance 815 to 1550MHz SiGe passive mixer.
It is designed for multicarrier cable head-end downstream video, cable modem termination systems (CMTS), video-on-demand and DOCSIS-compliant edge QAM modulation and wireless-infrastructure applications.
It delivers a combination of linearity and spurious suppression over a wide IF bandwidth of 50 to 1,000MHz.
When configured as a down-converter, this single IC provides 35dBm of IIP3, 24dBm of IP1dB, 7.4dB of conversion loss and a 7.8dB noise figure.
It also exhibits good levels of 2 x 1, 2 x 2 and 3 x 3 spurious suppression, with typical values of 88dBc, 79dBc and 101dBc (with a -14dBm input level), respectively, over the entire 50 to 1000MHz IF band.
Its high linearity and excellent spurious suppression are critical for ensuring DOCSIS-compliant transmission into the 50 to 1000MHz spectrum in cable head-end systems.
As an upconverter, the MAX2051 delivers equally impressive performance with 33.4dBm of IIP3, a low conversion loss of only 7.5dB and better than 61dBc of LO +/-2IF and 78dBc of LO +/-3IF suppression.
This device is suitable for all point-to-point and point-to-multipoint microwave and fixed broadband wireless-access base-station applications that require first IF to second IF upconversion stages covering the 850 to 1,550MHz band.
Maxim's proprietary SiGe process enables the MAX2051 to integrate a double-balanced mixer core with an LO amplifier, two baluns and dozens of discrete components.
When compared with the closest competing solution, the MAX2051 reduces the total board space by 72 per cent and reduces the discrete part count by 25 per cent.
The device's outstanding spurious performance also eases the filtering requirements of close-in harmonics, enabling simpler, smaller and more cost-effective filter designs.
To complement the mixer's wide IF range, the MAX2051 includes a similarly wide-range LO buffer circuit that is optimised for high-side LO injection architectures covering the 1,200 to 2,250MHz frequency spectrum.
The on-board 0dBm drive LO buffer provides +/-3dB drive-variance control, ensuring stable gain, NF and IIP3 performance over temperature, supply and input power.
The MAX2051 also has excellent gain-variation performance of 0.01dB/C over the -40 to +85C industrial temperature range.
The MAX2051 is packaged in a compact 5mm x 5mm, lead-free 20-pin TQFN package.
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