24 GHz to 44 GHz, Wideband, Microwave Downconverter

The ADMV1014 is a silicon germanium (SiGe), wideband, microwave downconverter optimized for point to point microwave radio designs operating in the 24 GHz to 44 GHz frequency range.

The downconverter offers two modes of frequency translation. The device is capable of direct quadrature demodulation to baseband inphase (I)/quadrature (Q) output signals, as well as image rejection downconversion to a complex intermediate frequency (IF) output carrier frequency. The baseband outputs can be dc-coupled, or, more typically, the I/Q outputs are ac-coupled with a sufficiently low high-pass corner frequency to ensure adequate demodulation accuracy. The serial port interface (SPI) allows fine adjustment of the quadrature phase to allow the user to optimize I/Q demodulation performance. Alternatively, the baseband I/Q outputs can be disabled, and the I/Q signals can be passed through an on-chip active balun to provide two single-ended complex IF outputs anywhere between 800 MHz and 6000 MHz. When used as an image rejecting downconverter, the unwanted image term is typically suppressed to better than 30 dBc below the wanted sideband. The ADMV1014 offers a flexible local oscillator (LO) system, including a frequency quadruple option allowing up to a 41 GHz range of LO input frequencies to cover a radio frequency (RF) input range as wide as 24 GHz to 44 GHz. A square law power detector is provided to allow monitoring of the power levels at the mixer inputs. The detector output provides closed-loop control of the RF input variable attenuator through an external op amp error integrator circuit option.

The ADMV1014 downconverter comes in a compact, thermally enhanced, 5 mm × 5 mm LGA package. The ADMV1014 operates over the −40°C to +85°C case temperature range.

Applications

* Point to point microwave radios

* Radar, electronic warfare systems

* Instrumentation, automatic test equipment (ATE)

* Wideband RF input frequency range: 24 GHz to 44 GHz

* 2 downconversion modes

* Direct conversion from RF to baseband I/Q

* Image rejecting downconversion to complex IF

* LO input frequency range: 5.4 GHz to 10.25 GHz

* LO quadrupler for up to 41 GHz

* Matched 50 Ω, single-ended RF input, and complex IF outputs

* Option between matched 100 Ω balanced or 50 Ω single-ended LO inputs