Part A
ADF4355BCPZ
ADI公司
- Lifecycle
- Active
- Stock
- 4953 件
- Package
- WFQFN-32
- Series
- 時鐘定時-時鐘發生器、PLL、頻率合成器
Replacement verdict
Not a drop-in replacement
The ADF4355BCPZ and ADF4360-0BCP are not drop-in replacements for one another. The ADF4355BCPZ is a wideband fractional-N synthesizer with an integrated VCO covering 54 MHz to 13.6 GHz, while the ADF4360-0BCP is a fixed 2.4 GHz to 2.725 GHz integer-N synthesizer with integrated VCO. They differ in frequency range, synthesis architecture, package footprint, and supply requirements, so a direct board-level substitution is not possible without redesign.
Different frequency range
Different synthesis architecture
Different package footprint
Different supply requirements
Parts at a glance
Part B
ADF4360-0BCP
ADI公司
- Lifecycle
- Active
- Stock
- 2650 件
- Package
- WFQFN-24
- Series
- 時鐘定時-時鐘發生器、PLL、頻率合成器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADF4355BCPZ | ADF4360-0BCP | Why it matters |
|---|---|---|---|
| Function | Fractional-N / Integer-N PLL frequency synthesizer with integrated VCO | Integer-N PLL frequency synthesizer with integrated VCO | Determines whether fractional-N synthesis is available; fractional-N allows finer frequency resolution and faster settling than integer-N only. |
| Frequency Range | Up to 6.8 GHz (RF output) | 2.4 GHz to 2.7 GHz | The output frequency range must cover the target application band; these parts cover very different bands. |
| Maximum PFD / Reference Frequency | Up to 125 MHz phase frequency detector | Up to 8 MHz phase frequency detector | A higher PFD frequency enables wider loop bandwidth, lower phase noise, and faster lock times. |
| Modulus / Fractional Resolution | Fractional-N with 25-bit modulus (12-bit FRAC, 13-bit MOD) | Integer-N only (dual-modulus prescaler) | Fractional capability enables much finer channel spacing without reducing PFD frequency, unlike integer-N designs. |
| Supply Voltage | 3.0 V to 3.6 V (analog and digital) | 3.0 V to 3.6 V | Supply compatibility affects whether the part can drop into an existing power rail design. |
| Package | 32-lead LFCSP (5 mm x 5 mm) | 24-lead LFCSP (4 mm x 4 mm) | Different footprints and pin counts prevent direct board-level substitution without layout changes. |
| Output Type | Differential RF output (programmable power) | Single-ended RF output | Output topology affects matching network design and whether a balun is required. |
| Control Interface | 3-wire SPI (up to 50 MHz) | 3-wire serial interface | Register maps and timing differ, so firmware must be rewritten even though both use serial control. |
| Integrated VCO | Yes, fundamental VCO with multiple bands | Yes, integrated VCO | Both integrate the VCO, reducing external component count, but tuning ranges differ significantly. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF4355BCPZ | ADF4360-0BCP |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Fanout Distribution, Fractional N, Integer N, Clock/Frequency Synthesizer (RF) | Fanout Distribution, Integer N Synthesizer (RF) |
| PLL | Yes | Yes |
| Input | Clock | CMOS |
| Output | Clock | Clock |
| Ratio - Input: Output | 1:2 | 1:2 |
| Differential - Input: Output | Yes/Yes | No/No |
| Frequency - Max | 6.8GHz | 2.725GHz |
| Divider / Multiplier | Yes/Yes | Yes/No |
| Voltage - Supply | 3.15V ~ 3.45V | 3V ~ 3.6V |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Circuits | 1 | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the ADF4355BCPZ and the ADF4360-0BCP?
The ADF4355BCPZ is a wideband fractional-N/integer-N PLL synthesizer with an integrated VCO covering 54 MHz to 13.6 GHz, while the ADF4360-0BCP is an integer-N PLL synthesizer with an integrated VCO covering 2400 MHz to 2725 MHz. The ADF4355BCPZ offers fractional-N operation, wider frequency coverage, and higher integration, whereas the ADF4360-0BCP is a simpler integer-N device targeted at narrowband applications.
Are the ADF4355BCPZ and ADF4360-0BCP pin-to-pin or package compatible?
No. The ADF4355BCPZ is supplied in a 32-lead LFCSP package, while the ADF4360-0BCP is supplied in a 24-lead LFCSP package. The different package sizes, pin counts, and pin functions prevent direct PCB footprint compatibility, so a redesign of the board layout is required when migrating between them.
What frequency ranges do the ADF4355BCPZ and ADF4360-0BCP cover?
The ADF4355BCPZ integrates a VCO with a fundamental output range of 3.4 GHz to 6.8 GHz and supports divided outputs extending overall coverage from 54 MHz to 13.6 GHz. The ADF4360-0BCP integrates a VCO covering 2400 MHz to 2725 MHz, with an output range of 2400 MHz to 2725 MHz.
Do both devices support fractional-N synthesis?
No. The ADF4355BCPZ supports both fractional-N and integer-N operation, enabling fine frequency resolution and low phase noise with a sigma-delta modulator. The ADF4360-0BCP is an integer-N PLL synthesizer only, so its frequency resolution is limited to the phase detector frequency divided by the integer modulus.
How do the phase noise and spurious performance of the two parts compare?
The ADF4355BCPZ is specified with a normalized phase noise floor of approximately -230 dBc/Hz in fractional-N mode and offers low in-band phase noise suitable for wideband synthesis. The ADF4360-0BCP is specified with a normalized phase noise floor of approximately -219 dBc/Hz in integer-N mode. Exact performance depends on loop filter design, reference frequency, and operating frequency, so datasheet plots should be consulted for the target band.
What are the supply voltage and power consumption differences?
The ADF4355BCPZ operates from a 3.3 V analog and digital supply with a charge pump supply up to 5 V, and its total power consumption depends on the enabled blocks and output configuration. The ADF4360-0BCP operates from a 3.3 V supply and typically draws about 45 mA including the VCO. Designers should verify exact current consumption against the respective datasheets for the chosen operating mode.
Which device is better suited for narrowband versus wideband applications?
The ADF4360-0BCP is intended for narrowband integer-N applications in the 2.4 GHz to 2.7 GHz range, such as fixed wireless and instrumentation where a simple, low-cost synthesizer is sufficient. The ADF4355BCPZ is intended for wideband applications requiring coverage from tens of MHz up to 13.6 GHz, fractional-N resolution, and multiple divided outputs, such as test equipment, microwave radios, and broadband tuners.
Can the ADF4360-0BCP be used as a drop-in replacement for the ADF4355BCPZ in an existing design?
No. Beyond the package and pin count differences, the ADF4360-0BCP covers only 2400 MHz to 2725 MHz and supports integer-N operation only, so it cannot replicate the ADF4355BCPZ's wideband coverage, fractional-N resolution, or divided output range. A replacement requires revalidation of the frequency plan, loop filter, reference requirements, and PCB layout against the ADF4360-0BCP datasheet.