GENERAL DESCRIPTION

The ADMV4640 is a microwave downconverter optimized for various

satellite communication (SATCOM) user terminals operating in

the 10.7 GHz to 12.7 GHz RF range.

The ADMV4640 local oscillator (LO) signal is generated internally

via the on-chip Integer N (INT) synthesizer. The internal synthesizer

enables LO frequency coverage from 8.7 GHz to 10.7GHz. The

input RF signals from 10.7 GHz to 12.7 GHz are downconverted

to an output intermediate frequency (IF) of 1.4 GHz to 2.2 GHz.

The chip includes filtering to reject the image band of 6.7 GHz

to 8.7 GHz. The on-chip low noise amplifier includes a 6 dB step

attenuator before the mixer to allow the user to trade off between

lower noise figure and higher linearity. In addition, the chip includes

a digital step attenuator at the IF output to provide up to 31 dB of

gain control range with 1 dB steps to adjust for subsequent cable

losses.

The digital serial peripheral interface (SPI) allows easy programming

of the device. In addition to the digital SPI control, an analog

control pin (RX_MUTE) quickly powers down all circuits and places

the receiver in standby mode for power saving. An analog generalpurpose

input-output (AGPIO) pin can be used either as an input

to be read by the on-chip analog-to-digital converter (ADC) or as

an output for internal analog proportional to absolute temperature

(PTAT) voltage. There are also three digital GPIO pins to output

logic levels to control external devices using the SPI.

The ADMV4640 downconverter comes in a compact, thermally

enhanced, 6 mm × 6 mm, 40-lead, lead frame chip scale package

(LFCSP). The ADMV4640 operates over the −40°C to +85°C case

temperature range.

FEATURES

► X/Ku band to IF downconverter with integrated PLL

► RF input frequency range: 10.7 GHz to 12.7 GHz

► Internal LO frequency range: 8.7 GHz to 10.7 GHz

► Noise figure: 5.2 dB, minimum attenuation, LNA low gain mode

► Matched, 50 Ω, single-ended RF input and IF output

► On-chip temperature sensor

► On-chip ADC

► Receiver synthesizer lock detect pin

► Programmable at 20 MHz via 4-wire SPI interface

► Receiver standby function

► 40-lead, 6 mm × 6 mm LFCSP package

APPLICATIONS

► SATCOM user terminals