Description

The SI4112-D-GT is an integrated circuit for wireless communication applications, specifically used for IF and dual-band RF synthesis. It is composed of three voltage-controlled oscillators (VCO), loop filters, reference and VCO dividers, and phase detectors. This model is programmable with a three-wire serial interface for divider and power-down settings.

Specifications and features

• Dual-band RF synthesizers: This model has two RF synthesizers: RF1 (900 MHz to 1.8 GHz) and RF2 (750 MHz to 1.5 GHz).
• IF synthesizer: This model has an IF synthesizer range of 62.5 to 1000 MHz.
• Integrated VCOs, loop filters, varactors, and resonators: The SI4112-D-GT has these components integrated into the circuit, with only a minimal number of external components required.
• Low phase noise: This characteristic helps reduce noise in the signal for better signal quality.
• Programmable power-down modes: This model has different power-down modes that can be programmed through a three-wire serial interface.
• 1 µA standby current: This model has a low standby current of only 1 µA.
• 2.7 to 3.6 V operation: The SI4112-D-GT operates within this voltage range.
• Packages: This model is available in 24-pin TSSOP and 28-lead QFN packages.
• Lead-free and RoHS compliant.

Application Scenarios

The SI4112-D-GT is ideal for the following applications:

• Dual-band communications
• Digital cellular telephones, specifically for GSM 850, E-GSM 900, DCS 1800, and PCS 1900
• Digital cordless phones
• Analog cordless phones
• Wireless local loop

Comparison

• The SI4112-D-GT has low phase noise, resulting in better signal quality.
• It only requires a minimal number of external components.
• With its programmable power-down modes, it consumes less power.
• It has an integrated IF and dual-band RF synthesis, which reduces the need for multiple components.

• The SI4112-D-GT requires a three-wire serial interface for programming, which may not be compatible with other systems.
• The operating voltage range is limited to 2.7 to 3.6 V.