Part A
ADF4156BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1350 PCS
- Package
- WFQFN-20
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
Replacement verdict
Compatible functional replacement candidate
The ADF4156BCPZ and ADF4113BCP are both single fractional-N PLL frequency synthesizers in a 20-lead LFCSP package with a comparable 3 V supply range and 3-wire SPI interface, making the ADF4156BCPZ a viable functional replacement candidate for the ADF4113BCP in many designs. However, the two devices differ in maximum operating frequency, fractional modulus resolution, and phase noise performance, so the replacement should be validated against the target frequency plan and loop filter design before adoption.
Package Type
High match
Supply Voltage Range
High match
Maximum Operating Frequency
Validation required
Fractional Modulus Resolution
Validation required
Parts at a glance
Part B
ADF4113BCP
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2741 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 | ADF4156BCPZ | ADF4113BCP | Why it matters |
|---|---|---|---|
| Maximum RF Input Frequency | 6 GHz | 4 GHz | Determines the highest frequency the PLL synthesizer can operate at; the ADF4156 supports higher-frequency applications. |
| Number of Fractional/Integer Modes | Fractional-N | Integer-N | Fractional-N allows finer frequency resolution and faster settling, while integer-N is simpler and often lower in phase noise for fixed channels. |
| Phase Detector Frequency (Max) | 32 MHz | 55 MHz | Higher phase detector frequency generally enables wider loop bandwidth and faster lock times. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 3.3 V | Both operate over the same supply range, so power supply compatibility is maintained. |
| Package Type | 20-Lead LFCSP | 20-Lead LFCSP | Identical package and pin count simplify PCB layout substitution, though pin functions must be verified. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching temperature ranges ensure equivalent environmental robustness for industrial applications. |
| Programmable Charge Pump Current | Up to 5 mA | Up to 5 mA | Charge pump current affects loop filter design and phase noise; matching ranges ease loop filter reuse. |
| Interface Type | 3-Wire SPI | 3-Wire SPI | Same serial interface simplifies microcontroller firmware reuse across designs. |
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 | ADF4156BCPZ | ADF4113BCP |
|---|---|---|
| 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 | 6.2GHz | 4GHz |
| 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 ADF4156BCPZ and the ADF4113BCP?
The ADF4156BCPZ is a fractional-N frequency synthesizer with an integrated VCO, operating up to 6 GHz, while the ADF4113BCP is an integer-N PLL synthesizer without an integrated VCO, operating up to 4 GHz. The ADF4156BCPZ supports fractional-N operation for finer frequency resolution, whereas the ADF4113BCP uses integer-N architecture requiring a lower reference frequency for fine steps.
Are the ADF4156BCPZ and ADF4113BCP pin-compatible?
No. The ADF4156BCPZ is supplied in a 20-lead LFCSP package, while the ADF4113BCP is supplied in a 20-lead TSSOP package. The package types, dimensions, and PCB land patterns differ, so they are not drop-in replacements.
What is the maximum operating frequency of each device?
The ADF4156BCPZ operates up to 6 GHz. The ADF4113BCP operates up to 4 GHz. Designs requiring frequencies above 4 GHz must use the ADF4156BCPZ or another suitable device.
Do both devices require an external VCO and loop filter?
The ADF4113BCP requires an external VCO and loop filter because it is an integer-N PLL synthesizer without an integrated VCO. The ADF4156BCPZ includes an integrated VCO, reducing external component count, though an external loop filter is still required for loop stability and performance optimization.
Which device offers finer frequency resolution?
The ADF4156BCPZ offers finer frequency resolution because it uses fractional-N architecture, allowing frequency steps smaller than the phase detector frequency. The ADF4113BCP, being integer-N, requires a lower phase detector frequency to achieve fine steps, which can increase lock time and phase noise trade-offs.
Can the ADF4113BCP be used as a direct replacement for the ADF4156BCPZ in an existing design?
No. The devices differ in architecture (integer-N vs fractional-N), package (TSSOP vs LFCSP), maximum frequency (4 GHz vs 6 GHz), and VCO integration. A direct replacement is not possible without redesigning the PCB, loop filter, and frequency plan, and revalidating performance against the target specifications.
What are the typical applications for each device?
The ADF4156BCPZ is typically used in wireless infrastructure, microwave point-to-point links, and instrumentation requiring high frequency and fine resolution. The ADF4113BCP is typically used in wireless handsets, base stations, and general-purpose PLL applications where integer-N synthesis up to 4 GHz is sufficient.