Part A
ADF4157BCPZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6114 個数
- Package
- WFQFN-20
- Series
- クロックタイミング - クロックジェネレータ、PLL、周波数シンセサイザ
Replacement verdict
Compatible functional replacement candidate
The ADF4157BCPZ and ADF4106BCP are both fractional-N PLL frequency synthesizers in a 20-lead LFCSP package with a compatible 3-wire SPI interface and overlapping supply voltage ranges, making the ADF4157BCPZ a viable functional replacement candidate for the ADF4106BCP in many designs. However, the two devices differ in maximum operating frequency, phase detector frequency, and fractional modulator resolution, so the replacement must be validated against the target loop bandwidth, phase noise, and spurious requirements before adoption.
Maximum RF Input Frequency
Validation required
Phase Detector Frequency
Validation required
Package Type
High match
Serial Interface
High match
Parts at a glance
Part B
ADF4106BCP
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4491 個数
- Package
- WFQFN-20
- Series
- クロックタイミング - クロックジェネレータ、PLL、周波数シンセサイザ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADF4157BCPZ | ADF4106BCP | Why it matters |
|---|---|---|---|
| Maximum RF Input Frequency | 6 GHz | 6 GHz | Determines the highest frequency the PLL synthesizer can operate at; both support up to 6 GHz. |
| Maximum PFD Frequency | 32 MHz | 104 MHz | Higher phase frequency detector rate enables wider loop bandwidth and faster lock times; the ADF4106 supports a much higher PFD rate. |
| Normalized Phase Noise Floor | -213 dBc/Hz | -219 dBc/Hz | Lower phase noise floor yields cleaner synthesized signals; the ADF4106 offers better noise performance. |
| RF Input Sensitivity Range | -10 dBm to +5 dBm (typical) | -10 dBm to +5 dBm (typical) | Defines the input power window over which the prescaler reliably divides; both have comparable sensitivity. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 3.3 V | Both operate from a 3 V nominal supply, allowing direct substitution in the same power rail design. |
| Package Type | 20-Lead LFCSP (4 mm x 4 mm) | 20-Lead LFCSP (4 mm x 4 mm) | Identical package footprint enables drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, suitable for the same application environments. |
| Programmable Charge Pump Current | 0.3 mA to 5 mA | 0.3 mA to 5 mA | Charge pump current range affects loop filter design and lock time; both offer the same programmable range. |
| Prescaler | 4/5, 8/9 dual-modulus | 8/9, 16/17, 32/33 dual-modulus | Prescaler options affect achievable division ratios and frequency planning; the ADF4106 offers more flexibility. |
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 | ADF4157BCPZ | ADF4106BCP |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Fractional N Synthesizer (RF) | Clock/Frequency Synthesizer (RF) |
| PLL | Yes | Yes |
| Input | CMOS, TTL | CMOS |
| Output | Clock | Clock |
| Ratio - Input: Output | 2:1 | 2:1 |
| Differential - Input: Output | Yes/No | Yes/No |
| Frequency - Max | 6GHz | 6GHz |
| Divider / Multiplier | Yes/Yes | No/No |
| Voltage - Supply | 2.7V ~ 3.3V | 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 ADF4157BCPZ and the ADF4106BCP?
The ADF4157BCPZ is a fractional-N PLL synthesizer with an integrated VCO, operating up to 6 GHz, while the ADF4106BCP is an integer-N PLL synthesizer that requires an external VCO and operates up to 6 GHz. The ADF4157BCPZ offers fractional-N capability for finer frequency resolution, whereas the ADF4106BCP uses integer-N architecture with a programmable dual-modulus prescaler (8/9, 16/17, 32/33, 64/65).
Are the ADF4157BCPZ and ADF4106BCP pin-compatible?
No. The ADF4157BCPZ is supplied in a 20-lead LFCSP package, while the ADF4106BCP is supplied in a 20-lead TSSOP package. The package types and pin assignments differ, so they are not pin-compatible and cannot be dropped into the same PCB footprint without redesign.
What is the maximum operating frequency of each device?
Both the ADF4157BCPZ and the ADF4106BCP support RF input frequencies up to 6 GHz. The ADF4157BCPZ integrates a VCO covering a wide range, while the ADF4106BCP requires an external VCO to achieve its operating frequency range.
Do both devices support fractional-N synthesis?
No. The ADF4157BCPZ is a fractional-N PLL synthesizer, enabling fine frequency step resolution and low phase noise. The ADF4106BCP is an integer-N PLL synthesizer, where the output frequency is an integer multiple of the phase detector frequency, requiring a smaller reference step to achieve fine resolution.
What are the typical power supply requirements for these devices?
Both the ADF4157BCPZ and the ADF4106BCP operate from a nominal 3.0 V to 3.6 V supply. The ADF4157BCPZ integrates a VCO, so its total power consumption includes the VCO, whereas the ADF4106BCP's consumption depends on the external VCO used.
Which device is better suited for low phase noise applications?
The ADF4157BCPZ is designed for low phase noise and includes an integrated VCO, which can simplify the signal chain and reduce noise contributions from external components. The ADF4106BCP's phase noise performance depends significantly on the external VCO selected, so overall noise performance is design-dependent.
Can the ADF4157BCPZ and ADF4106BCP be used in the same application interchangeably?
No. Because they differ in synthesis architecture (fractional-N vs integer-N), package type (LFCSP vs TSSOP), and VCO integration (integrated vs external), they are not interchangeable without significant redesign of the PCB, loop filter, and frequency planning.