Part A
ADF41020BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4229 Stückzahl
- Package
- WFQFN-20
- Series
- Clock-Timing mit Taktgeneratoren, PLLs, Frequenzsynthesizer
Replacement verdict
Compatible functional replacement candidate
The ADF41020BCPZ and ADF4106BCP are both integer-N PLL frequency synthesizers offering a high degree of functional overlap, making the ADF41020BCPZ a viable candidate for designs originally using the ADF4106BCP. However, the two devices differ in maximum operating frequency, package footprint, and supply voltage range, so the replacement is not a direct drop-in and requires validation of the RF front-end, board layout, and power rail against the target design before adoption.
Maximum Operating Frequency
Validation required
Package Type
Validation required
Function Type
High match
Supply Voltage Range
Validation required
Parts at a glance
Part B
ADF4106BCP
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4491 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 | ADF4106BCP | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 18 GHz | 6 GHz | Defines the highest input frequency the PLL can lock to; the ADF41020 supports much higher RF bands, so it is not a drop-in replacement for lower-frequency designs. |
| PLL Type / Architecture | Integer-N PLL frequency synthesizer | Integer-N PLL frequency synthesizer | Both are integer-N synthesizers, so the loop architecture and programming model are similar, aiding functional substitutability. |
| Maximum RF Input Frequency (REFIN) | Up to 250 MHz reference input | Up to 250 MHz reference input | The reference input range determines the usable phase detector frequency and step size; matching values simplify loop filter reuse. |
| Supply Voltage Range | 3.0 V to 3.6 V | 2.7 V to 3.3 V | Supply range affects compatibility with the board power rail; differing minimum and maximum voltages may require rail verification before substitution. |
| Package / Pin Count | 20-lead LFCSP (CP-20-10) | 20-lead LFCSP (CP-20-10) | Identical package and pin count allow the same PCB footprint, which is critical for physical drop-in compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature ranges ensure both parts meet the same environmental requirements. |
| Charge Pump Current (Programmable) | Programmable, up to 5 mA | Programmable, up to 5 mA | Charge pump current sets loop dynamics and lock time; similar programmable ranges allow reuse of loop filter designs. |
| Prescaler | Dual-modulus prescaler (programmable) | Dual-modulus prescaler (programmable) | The prescaler ratio affects achievable division ratios and frequency resolution; matching architecture supports similar synthesis planning. |
| Interface | 3-wire serial (SPI-compatible) | 3-wire serial (SPI-compatible) | A common serial programming interface allows the same microcontroller firmware to configure either device with minimal changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF41020BCPZ | ADF4106BCP |
|---|---|---|
| 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 | CMOS |
| Output | Clock | Clock |
| Ratio - Input: Output | 2:1 | 2:1 |
| Differential - Input: Output | No/No | Yes/No |
| Frequency - Max | 18GHz | 6GHz |
| Divider / Multiplier | Yes/No | No/No |
| Voltage - Supply | 2.85V ~ 3.15V | 2.7V ~ 3.3V |
| 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 ADF4106BCP?
The ADF41020BCPZ is a 20 GHz fractional-N/integer-N PLL frequency synthesizer, while the ADF4106BCP is a 6 GHz integer-N PLL frequency synthesizer. The ADF41020BCPZ supports higher RF input frequencies and fractional-N operation, whereas the ADF4106BCP is limited to integer-N operation with a maximum RF input of 6 GHz. Both are housed in 20-lead LFCSP packages but differ in frequency range and synthesis architecture.
Are the ADF41020BCPZ and ADF4106BCP pin-compatible?
Both devices are offered in a 20-lead LFCSP (CP-20) package with the same pin count and footprint. However, pin functions and internal architecture differ between the two devices, so designers must verify the pinout against the respective datasheets before considering any layout reuse. Pin compatibility does not guarantee functional interchangeability.
What is the maximum RF input frequency for each device?
The ADF41020BCPZ supports RF input frequencies up to 20 GHz. The ADF4106BCP supports RF input frequencies up to 6 GHz. Designs requiring operation above 6 GHz must use the ADF41020BCPZ or another suitable synthesizer.
Does the ADF41020BCPZ support fractional-N operation while the ADF4106BCP does not?
Yes. The ADF41020BCPZ is a fractional-N/integer-N synthesizer that supports fractional-N operation for finer frequency resolution. The ADF4106BCP is an integer-N synthesizer and does not support fractional-N mode. This architectural difference affects loop filter design, phase noise performance, and frequency step resolution.
Can the ADF4106BCP be used as a drop-in replacement for the ADF41020BCPZ?
No. The ADF4106BCP has a lower maximum RF input frequency (6 GHz vs. 20 GHz) and lacks fractional-N capability. It cannot serve as a drop-in replacement in applications requiring frequencies above 6 GHz or fractional-N synthesis. Replacement requires full validation against the target design's frequency, phase noise, and loop filter requirements.
What are the supply voltage requirements for these devices?
Both the ADF41020BCPZ and ADF4106BCP operate from a nominal 3.3 V supply. Designers should consult the respective manufacturer datasheets for the specified supply voltage range and current consumption before finalizing power supply designs.
Do both devices share the same digital interface for programming?
Both devices use a serial interface for register programming, consistent with the Analog Devices ADF41xx family architecture. However, the register maps and programming sequences differ between the fractional-N ADF41020BCPZ and the integer-N ADF4106BCP. Firmware and software must be adapted accordingly; register settings are not interchangeable.