The ADF4371 allows implementation of fractional-N or Integer N phase-locked loop (PLL) frequency synthesizers when used with an external loop filter and an external reference frequency. The wideband microwave voltage controlled oscillator (VCO) design allows frequencies from 62.5 MHz to 32 GHz to be generated.
The ADF4371 has an integrated VCO with a fundamental output frequency ranging from 4000 MHz to 8000 MHz. In addition, the VCO frequency is connected to divide by 1, 2, 4, 8, 16, 32, or 64 circuits that allows the user to generate radio frequency (RF) output frequencies as low as 62.5 MHz at RF8x. A frequency multiplier at RF16x generates from 8 GHz to 16 GHz. A frequency quadrupler generates frequencies from 16 GHz to 32 GHz at RF32x. RFAUX8x duplicates the frequency range of RF8x or permits direct access to the VCO output. To suppress the unwanted products of frequency multiplication, a harmonic filter exists between the multipliers and the output stages of RF16x and RF32x.
Control of all on-chip registers is through a 3-wire interface. The ADF4371 operates with analog and digital power supplies ranging from 3.15 V to 3.45 V, and 5 V for the VCO power supply. The ADF4371 also contains hardware and software power-down modes.
Features and Benefits:
- Fractional-N synthesizer and Integer N synthesizer
- High resolution 39-bit fractional modulus
- Typical spurious PFD: −90 dBc
- Integrated rms jitter: 38 fs (1 kHz to 100 MHz)
- Normalized phase noise floor: −234 dBc/Hz
- PFD operation to 250 MHz
- Reference frequency operation to 600 MHz
- Programmable divide by 1, 2, 4, 8, 16, 32, or 64 output
- 62.5 MHz to 8,000 MHz output at RF8x and RFAUX8x
- 8,000 MHz to 16,000 MHz output at RF16x
- 16,000 MHz to 32,000 MHz output at RF32x
- Lock time approximately 3 ms with automatic calibration
- Lock time <30 μs with autocalibration bypassed
- Analog and digital power supplies: 3.3 V
- VCO power supply: 3.3 V and 5 V
- RF output mute function
- 7mm × 7mm, 48-terminal LGA package
Applications:
- Wireless infrastructure (multicarrier global system for mobile communication (MC-GSM), 5 G)
- Test equipment and instrumentation
- Clock generation
- Aerospace and defense
Product Lifecycle: Production. At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.