Dual, SiGe, High-Linearity, 1200MHz to 2000MHz Downconversion Mixer with LO Buffer/Switch

The MAX19994A dual-channel downconverter is designed to provide 8.4dB of conversion gain, +25dBm input IP3, +14dBm 1dB input compression point, and a noise figure of 9.8dB for 1200MHz to 2000MHz diversity receiver applications. With an optimized LO frequency range of 1450MHz to 2050MHz, this mixer supports both high- and low-side LO injection architectures for the 1200MHz to 1700MHz and 1700MHz to 2000MHz RF bands, respectively.

In addition to offering excellent linearity and noise performance, the device also yields a high level of component integration. This device includes two double-balanced passive mixer cores, two LO buffers, a dual-input LO selectable switch, and a pair of differential IF output amplifiers. Integrated on-chip baluns allow for single-ended RF and LO inputs. The MAX19994A requires a nominal LO drive of 0dBm and a typical supply current of 330mA at VCC = 5.0V, or 264mA at VCC = 3.3V.

The MAX19994A is pin compatible with the MAX9985/MAX9995/MAX19985A/MAX19993/MAX19995/MAX19995A series of 700MHz to 2500MHz mixers and pin similar with the MAX19997A/MAX19999 series of 1850MHz to 4000MHz mixers, making this entire family of downconverters ideal for applications where a common PCB layout is used across multiple frequency bands.

The device is available in a 6mm x 6mm, 36-pin thin QFN package with an exposed pad. Electrical performance is guaranteed over the extended temperature range, from TC = -40°C to +85°C.

Applications

* cdma2000® Base Stations * Fixed Broadband Wireless Access * GSM/EDGE Base Stations * Military Systems * Private Mobile Radios * TD-SCDMA Base Stations * WCDMA/LTE Base Stations * Wireless Local Loop

* 1200MHz to 2000MHz RF Frequency Range

* 1450MHz to 2050MHz LO Frequency Range

* 50MHz to 500MHz IF Frequency Range

* 8.4dB Typical Conversion Gain

* 9.8dB Typical Noise Figure

* +25dBm Typical Input IP3

* +14dBm Typical Input 1dB Compression Point

* 68dBc Typical 2LO - 2RF Spurious Rejection at PRF = -10dBm

* Dual Channels Ideal for Diversity Receiver Applications

* 47dB Typical Channel-to-Channel Isolation

* Low -6dBm to +3dBm LO Drive

* Integrated LO Buffer

* Internal RF and LO Baluns for Single-Ended Inputs

* Built-In SPDT LO Switch with 48dB LO-to-LO Isolation and 50ns Switching Time

* Pin Compatible with the MAX9985/MAX9995/MAX19985A/MAX19993/MAX19995/MAX19995A Series of 700MHz to 2200MHz Mixers

* Pin Similar to the MAX19997A/MAX19999 Series of 1850MHz to 4000MHz Mixers

* Single 5.0V or 3.3V Supply

* External Current-Setting Resistors Provide Option for Operating Device in Reduced-Power/Reduced-Performance Mode