Part A
ADF41020BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4229 Stückzahl
- Package
- WFQFN-20
- Series
- Clock-Timing mit Taktgeneratoren, PLLs, Frequenzsynthesizer
Replacement verdict
Not a drop-in replacement
The ADF41020BCPZ and ADF4110BCP are both integer-N PLL frequency synthesizers, but they differ in maximum operating frequency, package and pinout, and supply voltage range, so the ADF4110BCP cannot directly replace the ADF41020BCPZ without design changes and revalidation.
Different maximum frequency
Different package and pinout
Different supply voltage range
Different PLL architecture
Parts at a glance
Part B
ADF4110BCP
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4237 Stückzahl
- Package
- WFQFN-20
- Series
- Clock-Timing mit Taktgeneratoren, PLLs, Frequenzsynthesizer
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADF41020BCPZ | ADF4110BCP | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 18 GHz | 550 MHz | Defines the highest input frequency the PLL synthesizer can accept; the ADF41020 targets microwave applications while the ADF4110 is limited to VHF/UHF bands. |
| PLL Type / Architecture | Integer-N frequency synthesizer | Integer-N frequency synthesizer | Both are integer-N PLLs, so loop filter and reference design approaches are similar, but the frequency range dictates the application domain. |
| RF Input Frequency Range | 0.5 GHz to 18 GHz | 0.1 GHz to 550 MHz | Determines which frequency bands the device can synthesize; the two parts are not functionally interchangeable across bands. |
| Supply Voltage | 3.0 V to 3.6 V | 2.7 V to 5.5 V | Affects compatibility with the system power rail; the ADF4110 tolerates a wider supply range including 5 V systems. |
| Package | 20-Lead LFCSP (4 mm x 4 mm) | 16-Lead LFCSP (3 mm x 3 mm) | Footprint and pin count differ, so PCB layout and rework are not drop-in compatible between the two parts. |
| Normalized Phase Noise Floor | -216 dBc/Hz (typical) | -211 dBc/Hz (typical) | Lower phase noise floor yields cleaner synthesized signals; the ADF41020 offers better noise performance for demanding microwave systems. |
| Maximum RF Input Power | +10 dBm | +5 dBm | Indicates the input drive level the prescaler can tolerate; exceeding it can degrade or damage the device. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental suitability is equivalent. |
| Programmable Charge Pump Current | 0.3 mA to 5 mA | 0.3 mA to 5 mA | Charge pump current sets loop bandwidth and lock time; matching ranges allow similar loop filter design methodology. |
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 | ADF41020BCPZ | ADF4110BCP |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Last Time Buy | Obsolete |
| Type | Clock/Frequency Synthesizer (RF) | Clock/Frequency Synthesizer (RF) |
| PLL | Yes with Bypass | Yes |
| Input | CMOS, TTL | Clock |
| Output | Clock | Clock |
| Ratio - Input: Output | 2:1 | 2:1 |
| Differential - Input: Output | No/No | Yes/No |
| Frequency - Max | 18GHz | 550MHz |
| Divider / Multiplier | Yes/No | Yes/No |
| Voltage - Supply | 2.85V ~ 3.15V | 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 ADF41020BCPZ and the ADF4110BCP?
The ADF41020BCPZ is a 20 GHz fractional-N/integer-N PLL frequency synthesizer with an integrated VCO, housed in a 32-lead LFCSP package. The ADF4110BCP is a lower-frequency integer-N PLL synthesizer (RF input up to approximately 550 MHz) in a 20-lead LFCSP package. They differ in frequency range, architecture, package, and pinout, so they are not drop-in replacements.
Can the ADF4110BCP be used as a direct substitute for the ADF41020BCPZ?
No. The two devices have different package footprints (20-lead vs 32-lead LFCSP), different pinouts, different frequency capabilities, and different architectures (integer-N vs fractional-N with integrated VCO). A direct substitution is not possible without a PCB redesign and full system revalidation.
What is the maximum RF input frequency of each device?
The ADF41020BCPZ supports RF input frequencies up to 20 GHz. The ADF4110BCP supports RF input frequencies up to approximately 550 MHz. Designs requiring microwave or millimeter-wave synthesis should use the ADF41020BCPZ, while the ADF4110BCP is suited to lower-frequency integer-N applications.
Do both devices require an external VCO?
No. The ADF41020BCPZ integrates a VCO on-chip, reducing external component count for high-frequency synthesis. The ADF4110BCP is a PLL synthesizer without an integrated VCO and requires an external VCO to complete the loop.
What are the package and pin-count differences between the two parts?
The ADF41020BCPZ is supplied in a 32-lead LFCSP package. The ADF4110BCP is supplied in a 20-lead LFCSP package. Because the pin counts and pin functions differ, the PCB land patterns and layout are not interchangeable.
Which device is better suited for low-phase-noise microwave synthesis?
The ADF41020BCPZ is intended for high-frequency synthesis up to 20 GHz with an integrated VCO and fractional-N capability, making it suitable for microwave applications. The ADF4110BCP is an integer-N synthesizer limited to lower RF frequencies and requires an external VCO, so it is generally not the choice for microwave-band synthesis.
Are the SPI/programming interfaces of the ADF41020BCPZ and ADF4110BCP compatible?
Both devices use a serial programming interface, but register maps, bit definitions, and control word formats differ between the fractional-N ADF41020BCPZ and the integer-N ADF4110BCP. Firmware written for one device cannot be reused unchanged for the other; the register configuration must be rewritten per the respective datasheets.