Part A
ADF4360-2BCPZ
ADI公司
- Lifecycle
- Active
- Stock
- 2192 件
- Package
- WFQFN-24
- 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 ADF4360-2BCPZ are not drop-in replacements for one another. Although both are Analog Devices fractional-N PLL synthesizers, they differ fundamentally in integration level, frequency range, supply architecture, and package footprint, so a direct board-level substitution is not feasible without redesign.
Different frequency range
Different integration level
Different supply voltage
Different package footprint
Parts at a glance
Part B
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
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 | ADF4360-2BCPZ | Why it matters |
|---|---|---|---|
| Frequency Range (Max) | 4400 MHz | 2170 MHz | Determines the highest output frequency the synthesizer can generate; the ADF4355 covers roughly twice the upper band, enabling higher-band applications. |
| Frequency Range (Min) | 53.125 MHz | 1050 MHz | Sets the lowest usable output; the ADF4355 reaches much lower frequencies, while the ADF4360-2 is restricted to a higher minimum. |
| Integrated VCO | Yes | Yes | Both integrate a VCO, simplifying loop design, but their VCO tuning ranges differ, affecting which bands each can cover without external components. |
| Output Frequency Divider / Prescaler | Dual modulus prescaler 4/5, 8/9 with programmable dividers | Fixed divide-by-2 output stage | The ADF4355 offers flexible division for wideband coverage, while the ADF4360-2 uses a fixed divide-by-2, limiting output flexibility. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Both operate from a 3.3 V nominal rail, so power-supply design is compatible between the two parts. |
| Package | 32-Lead LFCSP (5 mm x 5 mm) | 24-Lead LFCSP (4 mm x 4 mm) | Different footprints and pin counts mean the parts are not drop-in replacements; PCB layout must be redesigned. |
| Control Interface | 3-wire SPI | 3-wire SPI | Both use a compatible serial programming interface, easing firmware porting between the devices. |
| Phase Noise (Typical) | Lower phase noise (wideband fractional-N) | Higher phase noise (integer-N) | Phase noise affects signal purity and spectral performance; the ADF4355 generally offers better noise performance for demanding RF applications. |
| Synthesizer Type | Fractional-N / Integer-N PLL | Integer-N PLL | Fractional-N capability allows finer frequency resolution and faster settling, while integer-N is simpler but less flexible. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF4360-2BCPZ | ADF4355BCPZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Fanout Distribution, Integer N Synthesizer (RF) | Fanout Distribution, Fractional N, Integer N, Clock/Frequency Synthesizer (RF) |
| PLL | Yes | Yes |
| Input | CMOS, TTL | Clock |
| Output | Clock | Clock |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 1:2 | 1:2 |
| Differential - Input: Output | No/No | Yes/Yes |
| Frequency - Max | 2.17GHz | 6.8GHz |
| Divider / Multiplier | Yes/No | Yes/Yes |
| Voltage - Supply | 3V ~ 3.6V | 3.15V ~ 3.45V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key architectural differences between the ADF4355BCPZ and ADF4360-2BCPZ?
The ADF4355BCPZ is an integrated fractional-N PLL with an on-chip VCO covering 3.4 GHz to 6.8 GHz, while the ADF4360-2BCPZ is an integer-N PLL with an integrated VCO covering 1.85 GHz to 2.17 GHz. The ADF4355BCPZ supports fractional-N operation and a wider frequency range, whereas the ADF4360-2BCPZ is an integer-N synthesizer with a narrower, fixed VCO band.
What is the frequency range of each device?
The ADF4355BCPZ integrates a VCO with a fundamental output range of 3.4 GHz to 6.8 GHz, with lower frequencies available via internal dividers. The ADF4360-2BCPZ integrates a VCO covering 1.85 GHz to 2.17 GHz.
Do both devices include an integrated VCO?
Yes. Both the ADF4355BCPZ and ADF4360-2BCPZ integrate a VCO on-chip, which reduces external component count and simplifies loop filter and RF layout compared with discrete VCO plus PLL designs.
What are the package and pin-count differences?
The ADF4355BCPZ is supplied in a 32-lead LFCSP package, while the ADF4360-2BCPZ is supplied in a 24-lead LFCSP package. The different pin counts and land patterns mean the two devices are not footprint-compatible and cannot be dropped into the same PCB layout.
Can the ADF4355BCPZ and ADF4360-2BCPZ be used as direct substitutes?
No. They differ in synthesizer type (fractional-N versus integer-N), VCO frequency range, package size, pin count, and register/programming interface. A direct substitution is not possible without redesigning the RF matching, loop filter, and control interface.
Which device is better suited for wideband applications?
The ADF4355BCPZ is better suited for wideband applications because its integrated VCO covers 3.4 GHz to 6.8 GHz with fractional-N capability and divider options for lower bands. The ADF4360-2BCPZ is limited to its 1.85 GHz to 2.17 GHz VCO range and integer-N operation.
What is the difference in synthesizer type and its impact on design?
The ADF4355BCPZ uses a fractional-N architecture, enabling finer frequency resolution and faster settling for agile frequency synthesis. The ADF4360-2BCPZ uses an integer-N architecture, which typically requires a lower reference frequency and offers coarser step resolution, simplifying loop filter design for fixed-channel applications.
Are the control interfaces of the two devices compatible?
No. The ADF4355BCPZ uses a 32-bit register programming scheme over a three-wire SPI-compatible interface with multiple registers, while the ADF4360-2BCPZ uses a 24-bit register format over a similar three-wire interface. The register maps and bit definitions differ, so firmware and control software must be rewritten when migrating between the two.