ADF4156BRUZ

Series:	--
Packaging:	Tube
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	Fractional N Synthesizer (RF)
PLL:	Yes
Input:	CMOS, TTL
Output:	Clock
Number of Circuits:	1
Ratio - Input:Output:	2:1
Differential - Input:Output:	Yes/No
Frequency - Max:	6.2GHz
Divider/Multiplier:	Yes/Yes
Voltage - Supply:	2.7 V ~ 3.3 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	16-TSSOP
Base Part Number:	ADF4156

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ADF4156BRUZ Application Field and Working Principle

The ADF4156BRUZ from Analog Devices is a low power, easy to use fractional-N phase-locked loop frequency synthesizer with integrated VCO. The device has been designed to be used in a wide range of applications including, but not limited to, communications systems, cellular base station systems, instrumentation, measurement systems and radio frequency (RF) transmitter, receiver or transceiver systems.This device is an ideal choice for applications requiring a wide range of frequencies. Its programmable ranges cover frequencies between 1.3 GHz and 6.0 GHz in 0.5 Hz increments and its output power can be adjusted up to +20 dBm. The chip also features an integrated DC-coupled voltage-controlled oscillator (VCO), which offers a wide range of tuning from 400 MHz to 2700 MHz. The wide frequency range combined with its low power consumption makes it a great choice for systems that require precision control between two or more frequencies.

The ADF4156BRUZ follows the fractional-N phase-locked loop architecture and works by dividing the reference signal into two parts; the output divider stage known as a “fractional divisor” and the input divider stage known as “integer divisor”. The output frequency of the PLL is determined by the following equation:

F_out = F_ref * ( N_int / (N_int + N_fract) )

Where F_ref is the reference frequency, N_int is the integer divisor, and N_fract is the fractional divisor. The integer divisor is used to determine the coarse output frequency, while the fractional divisor is used to fine-tune the output frequency in increments of 0.5 Hz. The fractional-N PLL architecture creates a significantly larger tuning range than integer-N PLL architectures while still maintaining a high level of phase noise performance.

The ADF4156BRUZ also includes several control components such as a phase frequency detector (PFD), a charge pump, low pass filters, a voltage controlled oscillator (VCO) and a prescaler. The phase detector compares the reference signal with a nominal frequency generated from the feedback loop. If the two frequencies don’t match, it will output a DC offset based on the amount of difference. This DC offset is then fed to the charge pump which creates a current that is used to adjust the voltage controlled oscillator (VCO) instances frequency. The low pass filters are used to ensure a stable output frequency. Finally, the prescaler ensures that the output frequency is an integer multiple of the reference frequency.

In conclusion, the ADF4156BRUZ from Analog Devices is a great choice for applications where a wide range of frequency tuning and low power consumption is needed. Its fractional-N phase-locked loop architecture creates a wide tuning range while also offering a high level of phase noise performance. The device is ideal for a wide range of applications including communication systems, cellular base station systems, instrumentation, measurement systems, and radio frequency (RF) transmitter, receiver, and transceiver systems.

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