Part A
ADF41020BCPZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4229 PCS
- Package
- WFQFN-20
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
Replacement verdict
Not a drop-in replacement
The ADF41020BCPZ and ADF4112BCP 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, supply voltage range, and logic interface compatibility, so a direct board-level substitution is not possible without redesign.
Different maximum frequency
Different package and pinout
Different supply voltage range
Different logic interface
Parts at a glance
Part B
ADF4112BCP
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6937 PCS
- Package
- WFQFN-20
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
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 | ADF4112BCP | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 18 GHz | 4 GHz | Determines the highest RF input frequency the PLL synthesizer can handle; the ADF41020 supports much higher frequency operation. |
| Number of RF Inputs | 2 (dual RF input) | 1 | Dual RF inputs allow the ADF41020 to switch between two frequency bands without external switching, while the ADF4112 has a single input. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 5.5 V | Affects compatibility with the system power rail; the ADF4112 tolerates a wider supply range including 5 V systems. |
| Package Type | 20-Lead LFCSP (CP-20-6) | 16-Lead LFCSP (CP-16-1) | Footprint and pin count differ, so the two parts are not drop-in replacements on the same PCB layout. |
| Maximum Prescaler Input Frequency | 18 GHz | 4 GHz | Sets the upper limit for the prescaler stage and thus the usable VCO/loop frequency range of the synthesizer. |
| Phase Detector Frequency (PFD) | Up to 104 MHz | Up to 55 MHz | Higher PFD allows wider loop bandwidth and faster settling, which the ADF41020 supports to a greater degree. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both parts share the same industrial temperature range, so thermal environment requirements are equivalent. |
| Charge Pump Current (Programmable) | Programmable, up to 5 mA | Programmable, up to 5 mA | Charge pump current influences loop filter design and lock time; both offer comparable programmable ranges. |
| Interface Type | 3-wire serial (SPI-compatible) | 3-wire serial (SPI-compatible) | Both use the same serial programming interface, simplifying firmware reuse across designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF41020BCPZ | ADF4112BCP |
|---|---|---|
| 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 | 3GHz |
| 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 ADF4112BCP?
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 ADF4112BCP is a 3 GHz integer-N PLL frequency synthesizer without an integrated VCO, housed in a 20-lead LFCSP package. The ADF41020BCPZ targets higher-frequency applications, while the ADF4112BCP is suited to lower-frequency integer-N designs.
Are the ADF41020BCPZ and ADF4112BCP pin-to-pin or package compatible?
No. The ADF41020BCPZ uses a 32-lead LFCSP package, while the ADF4112BCP uses a 20-lead LFCSP package. The different pin counts and land patterns mean they are not drop-in replacements for each other.
What is the maximum operating frequency of each device?
The ADF41020BCPZ supports RF input frequencies up to 20 GHz. The ADF4112BCP supports RF input frequencies up to 3 GHz. Designs requiring operation above 3 GHz cannot use the ADF4112BCP.
Does either device include an integrated VCO?
The ADF41020BCPZ includes an integrated VCO, which simplifies loop filter and board design for high-frequency synthesis. The ADF4112BCP does not include an integrated VCO and requires an external VCO in the loop.
What are the differences in synthesizer architecture between the two parts?
The ADF41020BCPZ supports both fractional-N and integer-N operation, enabling finer frequency resolution and faster lock times. The ADF4112BCP is an integer-N synthesizer only, so frequency resolution is set by the reference frequency and divider ratios.
Can the ADF4112BCP be used as a direct substitute for the ADF41020BCPZ in an existing design?
No. The ADF4112BCP has a lower maximum RF input frequency (3 GHz vs 20 GHz), lacks an integrated VCO, uses a different package and pinout, and supports only integer-N operation. Substitution requires full revalidation of the RF, loop filter, and PCB layout against the target design.
Which device is better suited for high-frequency microwave synthesis?
The ADF41020BCPZ is the appropriate choice for high-frequency microwave synthesis because its RF input operates up to 20 GHz and it integrates a VCO. The ADF4112BCP, limited to 3 GHz, is not suitable for microwave-band synthesis above that frequency.