Part A
ADF4356BCPZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2460 個数
- Package
- LFCSP-32
- Series
- クロックタイミング - クロックジェネレータ、PLL、周波数シンセサイザ
Replacement verdict
Compatible functional replacement candidate
The ADF4356BCPZ and ADF4355-2BCPZ-RL7 are both wideband fractional-N PLL synthesizers from Analog Devices sharing the same 32-lead LFCSP package and 3.15 V to 3.45 V supply range, making them strong functional replacement candidates. The ADF4356BCPZ offers a higher maximum RF output frequency and improved phase noise performance, while the ADF4355-2BCPZ-RL7 provides a lower maximum frequency with comparable integration. Designers should validate loop filter and register configuration differences before substituting in existing designs.
Package Type
High match
Supply Voltage Range
High match
Maximum Output Frequency
Validation required
Phase Noise Performance
Validation required
Parts at a glance
Part B
ADF4355-2BCPZ-RL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4154 個数
- Package
- WFQFN-32
- Series
- クロックタイミング - クロックジェネレータ、PLL、周波数シンセサイザ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADF4356BCPZ | ADF4355-2BCPZ-RL7 | Why it matters |
|---|---|---|---|
| Frequency Range (Max) | 6.8 GHz | 6.8 GHz | Both cover the same upper frequency, so neither offers extended high-band coverage over the other. |
| Frequency Range (Min) | 53.125 MHz | 53.125 MHz | Identical lower bound means low-frequency synthesis capability is equivalent. |
| Normalized Phase Noise Floor | -227 dBc/Hz | -225 dBc/Hz | Lower phase noise floor improves spectral purity and is critical for high-performance RF synthesis. |
| 1/f Noise (PN1/f) | -117 dBc/Hz | -115 dBc/Hz | Better close-in 1/f noise benefits low-offset phase noise performance in sensitive applications. |
| Maximum RF Output Power | 5 dBm | 5 dBm | Equal output power means similar drive capability into downstream stages. |
| Supply Voltage | 3.15 V to 3.45 V | 3.15 V to 3.45 V | Same supply window allows drop-in power design compatibility. |
| Package / Pin Count | 32-Lead LFCSP (5x5 mm) | 32-Lead LFCSP (5x5 mm) | Identical package and footprint enable direct PCB substitution without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same temperature rating ensures equivalent environmental robustness. |
| Integrated VCO | Yes | Yes | Both integrate a VCO, reducing external component count and board area. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF4356BCPZ | ADF4355-2BCPZ-RL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Type | Fanout Distribution, Fractional N, Integer N, Clock/Frequency Synthesizer (RF) | Fanout Distribution, Fractional N, Integer N, Clock/Frequency Synthesizer (RF) |
| PLL | Yes | Yes |
| Input | Clock | Clock |
| Output | Clock | Clock |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 1:2 | 1:2 |
| Differential - Input: Output | Yes/No | No/No |
| Frequency - Max | 6.8GHz | 4.4GHz |
| Divider / Multiplier | Yes/Yes | Yes/Yes |
| Voltage - Supply | 3.15V ~ 3.45V | 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 differences between the ADF4356BCPZ and the ADF4355-2BCPZ-RL7?
The ADF4356BCPZ is a 6.8 GHz fractional-N PLL synthesizer with integrated VCO, while the ADF4355-2BCPZ-RL7 is a 6.8 GHz fractional-N PLL synthesizer with integrated VCO that supports a higher maximum phase detector frequency and offers different output divider and power consumption characteristics. Both are pin-compatible in the 32-lead LFCSP package, but the ADF4356 provides improved phase noise and higher PFD frequency capability compared to the ADF4355-2.
Are the ADF4356BCPZ and ADF4355-2BCPZ-RL7 pin-compatible?
Yes, both devices are offered in a 32-lead LFCSP package with the same pinout, allowing for board-level compatibility when the surrounding circuitry and firmware are validated for the specific device.
What is the maximum RF output frequency for each device?
Both the ADF4356BCPZ and the ADF4355-2BCPZ-RL7 support RF output frequencies up to 6.8 GHz from the integrated VCO, with lower frequencies available through internal dividers.
How do the phase noise specifications compare between the ADF4356BCPZ and ADF4355-2BCPZ-RL7?
The ADF4356BCPZ offers improved phase noise performance compared to the ADF4355-2BCPZ-RL7, making it preferable for applications requiring lower jitter and better spectral purity. Designers should consult the respective datasheets for normalized phase noise figures at specific frequencies and loop filter conditions.
What is the maximum phase detector frequency supported by each device?
The ADF4356BCPZ supports a higher maximum phase detector frequency than the ADF4355-2BCPZ-RL7, which can enable lower in-band phase noise and faster lock times in fractional-N mode. The exact PFD limits should be verified in the manufacturer datasheets.
Can the ADF4355-2BCPZ-RL7 be used as a drop-in replacement for the ADF4356BCPZ?
Because the two devices share the same package and pinout, a drop-in replacement may be possible, but it requires validation of phase noise, PFD frequency, output power, and register map differences against the target design. The ADF4356BCPZ generally offers higher performance, so substituting the ADF4355-2 may degrade certain specifications.
What are the typical applications for these PLL synthesizers?
Both the ADF4356BCPZ and ADF4355-2BCPZ-RL7 are used in wireless infrastructure, microwave point-to-point links, satellite communications, test and measurement equipment, and clock generation where wideband frequency synthesis up to 6.8 GHz is required.