Part A
ADF4355BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4953 PCS
- Package
- WFQFN-32
- Series
- Horário - Geradores de relógios, PLLs, Sintetizadores de Frequências
Replacement verdict
Not a drop-in replacement
The ADF4360-4BCPZ and ADF4355BCPZ are not functionally interchangeable: they differ in integrated VCO frequency range, maximum RF output frequency, package footprint, and supply voltage requirements, so the ADF4355BCPZ cannot directly replace the ADF4360-4BCPZ without redesign of the RF matching network, power supply, and PCB layout.
Different frequency range
Different package footprint
Different supply voltage
Different output configuration
Parts at a glance
Part B
ADF4360-4BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2726 PCS
- Package
- WFQFN-24
- Series
- Horário - Geradores de relógios, PLLs, Sintetizadores de Frequências
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADF4360-4BCPZ | ADF4355BCPZ | Why it matters |
|---|---|---|---|
| Frequency Range (Max) | 1.85 GHz | 4.4 GHz | Determines the highest output frequency the synthesizer can generate; the ADF4355 covers a much wider upper band. |
| Frequency Range (Min) | 1.6 GHz | 54 MHz | Defines the lowest usable output frequency; the ADF4355 supports much lower frequencies via its integrated VCO divider. |
| Integrated VCO | Yes | Yes | An on-chip VCO reduces external component count and board area; both parts integrate one but with different tuning ranges. |
| Maximum PFD / Reference Frequency | 8 MHz | 125 MHz | A higher phase-frequency detector rate enables wider loop bandwidth and faster lock times; the ADF4355 supports a much higher PFD. |
| RF Output Divider / Prescaler | Fixed divide-by-2 (dual outputs) | Programmable 1/2/4/8/16/32/64 | Programmable dividers extend the usable output range and allow flexible frequency planning; the ADF4360 has limited fixed division. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V (analog/digital), 4.75 V to 5.25 V (VCO/charge pump) | Supply requirements affect power rail design; the ADF4355 needs an additional higher voltage rail for its VCO and charge pump. |
| Package | 24-Lead LFCSP (4x4 mm) | 32-Lead LFCSP (5x5 mm) | Footprint and pin count affect PCB layout and drop-in compatibility; the two parts are not footprint-compatible. |
| Control Interface | 3-wire serial (SPI-compatible) | 3-wire serial (SPI-compatible) | Both use a similar serial programming interface, but register maps differ, so firmware must be rewritten. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature ratings mean both suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF4355BCPZ | ADF4360-4BCPZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Fanout Distribution, Fractional N, Integer N, Clock/Frequency Synthesizer (RF) | Fanout Distribution, Integer N Synthesizer (RF) |
| PLL | Yes | Yes |
| Input | Clock | CMOS, TTL |
| Output | Clock | Clock |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 1:2 | 1:2 |
| Differential - Input: Output | Yes/Yes | No/No |
| Frequency - Max | 6.8GHz | 1.75GHz |
| Divider / Multiplier | Yes/Yes | Yes/No |
| Voltage - Supply | 3.15V ~ 3.45V | 3V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADF4360-4BCPZ and the ADF4355BCPZ?
The ADF4360-4BCPZ is an integrated integer-N synthesizer and VCO operating from 1.6 GHz to 2.0 GHz, while the ADF4355BCPZ is a wideband fractional-N/integer-N PLL synthesizer with an integrated VCO covering 3.4 GHz to 6.8 GHz. The ADF4355BCPZ supports fractional-N operation and a wider frequency range, whereas the ADF4360-4BCPZ is an integer-N device with a narrower, fixed VCO band.
Do the ADF4360-4BCPZ and ADF4355BCPZ use the same package and pinout?
No. The ADF4360-4BCPZ is supplied in a 24-lead LFCSP package, while the ADF4355BCPZ is supplied in a 32-lead LFCSP package. The pin counts and pin functions differ, so the two devices are not pin-compatible and cannot be dropped into the same PCB land pattern.
What is the output frequency range of each device?
The ADF4360-4BCPZ integrates a VCO with an output frequency range of 1.6 GHz to 2.0 GHz. The ADF4355BCPZ integrates a VCO with a fundamental output range of 3.4 GHz to 6.8 GHz, and its output dividers allow lower frequencies to be derived from that range.
Does either device support fractional-N operation?
The ADF4355BCPZ supports both fractional-N and integer-N operation. The ADF4360-4BCPZ is an integer-N synthesizer and does not provide fractional-N modulus capability.
How do the supply voltage requirements compare?
The ADF4360-4BCPZ operates from a 3.0 V to 3.6 V supply. The ADF4355BCPZ operates from a 3.15 V to 3.45 V analog and digital supply, with a separate charge pump supply range of 3.15 V to 5.25 V. Designs must account for these differing rails and tolerances.
Can the ADF4360-4BCPZ be used as a direct replacement for the ADF4355BCPZ?
No. The devices differ in package, pinout, frequency range, synthesis architecture (integer-N versus fractional-N), and supply requirements. A direct replacement is not possible without redesigning the PCB, loop filter, and control software, and revalidating performance against the manufacturer datasheets.
Which device is better suited for wideband applications requiring fine frequency resolution?
The ADF4355BCPZ is generally better suited for wideband applications needing fine frequency resolution because it provides fractional-N operation and a 3.4 GHz to 6.8 GHz VCO range with output dividers. The ADF4360-4BCPZ is limited to integer-N operation over a 1.6 GHz to 2.0 GHz range.