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