Part A
ADF41020BCPZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4229 ПКС
- Package
- WFQFN-20
- Series
- Часовое время - Часовые генераторы, PLL, частотные синтезаторы
Replacement verdict
Not a drop-in replacement
The ADF41020BCPZ and ADF4111BCP are not drop-in replacements for one another. Although both are integer-N PLL frequency synthesizers from Analog Devices, they differ in maximum operating frequency, package and pinout, and supply voltage range, so a direct board-level substitution is not possible without redesign and revalidation.
Different maximum frequency
Different package and pinout
Different supply voltage range
Different PLL architecture
Parts at a glance
Part B
ADF4111BCP
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9249 ПКС
- Package
- WFQFN-20
- Series
- Часовое время - Часовые генераторы, PLL, частотные синтезаторы
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 | ADF4111BCP | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 18 GHz | 4 GHz | Defines the highest RF input the PLL can lock to; the ADF41020 supports much higher frequency bands, so it is not a drop-in replacement for lower-frequency designs. |
| PLL Type / Architecture | Integer-N frequency synthesizer | Integer-N frequency synthesizer | Both are integer-N PLLs, so the loop architecture and design equations are similar, aiding functional substitutability at the architectural level. |
| Maximum Prescaler Input Frequency | 18 GHz | 4 GHz | The prescaler sets the maximum VCO frequency that can be divided; the ADF41020's higher prescaler rating enables operation in microwave bands. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 5.5 V | Determines compatibility with the system power rail; the ADF4111 tolerates a wider supply range, while the ADF41020 is limited to 3.3 V systems. |
| Package Type | 20-Lead LFCSP (CP-20) | 20-Lead LFCSP (CP-20) | Package footprint and pinout affect PCB layout compatibility; matching packages simplify board-level substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts are rated for industrial temperature environments, supporting use in similar application conditions. |
| Number of Pins | 20 | 20 | Pin count affects package compatibility and layout; identical pin counts ease potential board reuse. |
| Charge Pump Current (Programmable) | Programmable (up to ~5 mA) | Programmable (up to ~5 mA) | Charge pump current influences loop filter design and phase noise; similar programmable ranges allow comparable loop dynamics. |
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 | ADF4111BCP |
|---|---|---|
| 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 | 1.2GHz |
| 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 ADF4111BCP?
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 ADF4111BCP is a lower-frequency integer-N PLL synthesizer (RF input up to approximately 1.2 GHz) in a 20-lead LFCSP package. They differ in frequency range, architecture (fractional-N with integrated VCO versus integer-N), package footprint, and target applications.
Can the ADF41020BCPZ and ADF4111BCP be used interchangeably in the same design?
No. The two devices have different pin counts and package footprints (32-lead LFCSP versus 20-lead LFCSP), different frequency capabilities, and different architectures. A direct drop-in replacement is not possible; any substitution would require a PCB redesign and full validation against the manufacturer datasheets.
What is the maximum RF input frequency of each device?
The ADF41020BCPZ supports RF input frequencies up to 20 GHz. The ADF4111BCP supports RF input frequencies up to approximately 1.2 GHz. Designs requiring operation above 1.2 GHz cannot use the ADF4111BCP.
Do both devices include an integrated VCO?
No. The ADF41020BCPZ integrates a VCO on-chip, which simplifies loop filter and layout design for high-frequency synthesis. The ADF4111BCP is a PLL synthesizer without an integrated VCO, so an external VCO must be selected and matched to the loop.
What are the package and pin-count differences between the ADF41020BCPZ and ADF4111BCP?
The ADF41020BCPZ is supplied in a 32-lead LFCSP package, while the ADF4111BCP is supplied in a 20-lead LFCSP package. The differing pin counts and land patterns mean the two parts are not footprint-compatible and require separate PCB layouts.
Which device is better suited for high-frequency microwave applications?
The ADF41020BCPZ is the appropriate choice for high-frequency microwave applications because its RF input extends to 20 GHz and it includes an integrated VCO. The ADF4111BCP, limited to approximately 1.2 GHz RF input, is intended for lower-frequency integer-N synthesis applications.
Are the ADF41020BCPZ and ADF4111BCP both integer-N synthesizers?
No. The ADF4111BCP is an integer-N PLL synthesizer. The ADF41020BCPZ supports fractional-N operation in addition to integer-N operation, which allows finer frequency resolution and potentially lower phase noise trade-offs depending on configuration.