Part A
ADF4157BCPZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6114 PCS
- Package
- WFQFN-20
- Series
- Horloge Timing - générateur d'horloge, PLL, synthétiseur de fréquence
Replacement verdict
Not a drop-in replacement
The ADF4157BCPZ and ADF4110BCP are both fractional-N PLL synthesizers, but they differ in maximum operating frequency, supply voltage range, and package footprint, so the ADF4110BCP cannot be used as a direct drop-in substitute for the ADF4157BCPZ without design validation.
Different maximum frequency
Different supply voltage range
Different package footprint
Different phase noise performance
Parts at a glance
Part B
ADF4110BCP
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4237 PCS
- Package
- WFQFN-20
- Series
- Horloge Timing - générateur d'horloge, PLL, synthétiseur de fréquence
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADF4157BCPZ | ADF4110BCP | Why it matters |
|---|---|---|---|
| Maximum RF Input Frequency | 6 GHz | 550 MHz | Determines the highest frequency the PLL can synthesize; the ADF4157 supports much higher frequency operation than the ADF4110. |
| Number of Fractional/Integer Modes | Fractional-N | Integer-N | Fractional-N allows finer frequency resolution and faster settling, while integer-N is simpler but requires smaller reference steps for fine resolution. |
| Maximum Phase Detector Frequency | 32 MHz | 55 MHz | Affects loop bandwidth and phase noise performance; a higher PFD frequency generally enables wider loop bandwidths and lower in-band phase noise. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 5.5 V | Defines the compatible power supply; the ADF4110 tolerates a wider range including 5 V systems, while the ADF4157 is limited to 3.3 V. |
| Package Type | 20-Lead LFCSP | 20-Lead LFCSP | Both use the same 20-lead LFCSP footprint, which supports board-level interchangeability of the package. |
| Normalized Phase Noise Floor | -216 dBc/Hz | -212 dBc/Hz | Indicates the intrinsic phase noise contribution of the PLL; lower values yield cleaner synthesized signals. |
| Programmable Charge Pump Current | Up to 5 mA | Up to 5 mA | Charge pump current sets loop gain and affects settling time and phase noise; both offer comparable programmability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts are rated for the same industrial temperature environment. |
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 | ADF4157BCPZ | ADF4110BCP |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Fractional N Synthesizer (RF) | Clock/Frequency Synthesizer (RF) |
| PLL | Yes | Yes |
| Input | CMOS, TTL | Clock |
| Output | Clock | Clock |
| Ratio - Input: Output | 2:1 | 2:1 |
| Differential - Input: Output | Yes/No | Yes/No |
| Frequency - Max | 6GHz | 550MHz |
| Divider / Multiplier | Yes/Yes | Yes/No |
| Voltage - Supply | 2.7V ~ 3.3V | 2.7V ~ 5.5V |
| 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 ADF4157BCPZ and the ADF4110BCP?
The ADF4157BCPZ is a fractional-N PLL frequency synthesizer with an integrated VCO, operating up to 6 GHz, while the ADF4110BCP is an integer-N PLL synthesizer without an integrated VCO, operating up to 550 MHz. The ADF4157BCPZ supports fractional-N operation for finer frequency resolution, whereas the ADF4110BCP uses integer-N architecture.
Are the ADF4157BCPZ and ADF4110BCP pin-compatible?
No. The ADF4157BCPZ is supplied in a 20-lead LFCSP package, while the ADF4110BCP is supplied in a 16-lead TSSOP package. The different package types, pin counts, and pin functions prevent direct pin-to-pin compatibility.
What is the maximum operating frequency of each device?
The ADF4157BCPZ supports RF input frequencies up to 6 GHz. The ADF4110BCP supports RF input frequencies up to 550 MHz. These figures are specified in the respective Analog Devices datasheets.
Do both devices require an external VCO?
No. The ADF4157BCPZ includes an integrated VCO, reducing external component count. The ADF4110BCP does not include an integrated VCO and requires an external VCO to complete the PLL loop.
What are the supply voltage requirements for each part?
The ADF4157BCPZ operates from a 2.7 V to 3.3 V supply. The ADF4110BCP operates from a 2.7 V to 3.3 V supply as well. Both are specified for nominal 3 V operation in their respective datasheets.
Can the ADF4110BCP be used in fractional-N applications?
No. The ADF4110BCP is an integer-N PLL synthesizer and does not support fractional-N operation. Fractional-N capability is provided by devices such as the ADF4157BCPZ.
Which device is better suited for low-phase-noise applications?
The ADF4157BCPZ is specified with a normalized phase noise floor of -219 dBc/Hz, while the ADF4110BCP is specified with a normalized phase noise floor of -211 dBc/Hz. Lower normalized phase noise floor generally supports better phase noise performance, but actual performance depends on loop filter design and reference source.
What are the operating temperature ranges for these devices?
Both the ADF4157BCPZ and ADF4110BCP are specified for operation over the -40°C to +85°C industrial temperature range, as stated in their respective Analog Devices datasheets.