Part A
ADF4001BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1703 Stückzahl
- Package
- WFQFN-20
- Series
- Clock-Timing mit Taktgeneratoren, PLLs, Frequenzsynthesizer
Replacement verdict
Compatible functional replacement candidate
The ADF4002BCPZ and ADF4001BCPZ are both single PLL frequency synthesizers in a 20-lead LFCSP package with a shared 3-wire serial interface and comparable supply requirements, making the ADF4002BCPZ a viable functional replacement candidate for the ADF4001BCPZ in many designs. However, the ADF4002BCPZ adds a programmable phase detector polarity and charge pump current range that differ from the ADF4001BCPZ, so loop filter and lock detect behavior should be validated against the target application before substitution.
Package Type
High match
Supply Voltage Range
High match
Serial Interface
High match
Charge Pump Current
Validation required
Parts at a glance
Part B
ADF4002BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3484 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 | ADF4002BCPZ | ADF4001BCPZ | Why it matters |
|---|---|---|---|
| Number of RF Inputs | 2 (dual) | 1 (single) | Determines how many independent RF signal paths the PLL can lock; dual inputs enable switching between two sources without external multiplexing. |
| Maximum RF Input Frequency | 400 MHz | 200 MHz | Sets the upper limit of the reference/feedback signal the prescaler can accept, directly bounding the achievable loop bandwidth and output frequency range. |
| Maximum PFD Frequency | 104 MHz | 55 MHz | The phase-frequency detector rate affects phase noise and lock time; a higher PFD allows wider loop bandwidths and faster settling. |
| Programmable Charge Pump Current | Up to 5 mA | Up to 5 mA | Charge pump current scales loop gain and influences phase noise and lock time; both parts offer similar programmability here. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 3.3 V | Defines the compatible power rail; identical ranges mean either device can drop into the same supply design. |
| Package | 20-Lead LFCSP (4x4 mm) | 20-Lead LFCSP (4x4 mm) | Footprint and pin count must match for board-level substitutability; identical packages simplify replacement. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Confirms both parts are rated for the same industrial temperature envelope, so environmental constraints are equivalent. |
| Interface | 3-wire serial (SPI-compatible) | 3-wire serial (SPI-compatible) | The control interface must match the host microcontroller; identical serial interfaces allow reuse of existing firmware drivers. |
| Prescaler | Dual-modulus 8/9, 16/17, 32/33, 64/65 | Dual-modulus 8/9, 16/17, 32/33, 64/65 | Prescaler options determine the achievable division ratios and thus the output frequency planning; matching options ease substitution. |
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 | ADF4001BCPZ | ADF4002BCPZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Clock Generator (RF) | Clock/Frequency Synthesizer (RF), Phase Detector |
| PLL | Yes | Yes with Bypass |
| Input | CMOS, TTL | CMOS, TTL |
| Output | Clock | Clock |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 2:1 | 2:1 |
| Differential - Input: Output | Yes/No | Yes/No |
| Frequency - Max | 200MHz | 400MHz |
| Divider / Multiplier | Yes/No | Yes/No |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 3.3V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the primary functional difference between the ADF4002BCPZ and ADF4001BCPZ?
Both are PLL frequency synthesizers, but the ADF4002BCPZ integrates a phase frequency detector (PFD) with programmable charge pump and a dual-modulus prescaler, while the ADF4001BCPZ is a complete PLL synthesizer with an on-chip VCO. The ADF4002BCPZ is typically used with an external VCO, whereas the ADF4001BCPZ includes an internal VCO covering a specified frequency range.
Are the ADF4002BCPZ and ADF4001BCPZ pin-compatible?
No. The ADF4002BCPZ and ADF4001BCPZ have different pinouts and package functions. The ADF4001BCPZ includes VCO-related pins and supply connections not present on the ADF4002BCPZ. They are not direct drop-in replacements and require separate PCB layouts.
What is the maximum operating frequency of each device?
The ADF4002BCPZ supports a maximum RF input frequency of 400 MHz at the RF input and 100 MHz at the PFD. The ADF4001BCPZ integrates a VCO with a specified output frequency range (typically 200 MHz to 1.5 GHz depending on the exact model variant). Designers must verify the exact frequency range from the respective datasheet for their target band.
Do both devices support the same serial interface and register map?
No. While both use a 3-wire serial interface (CLK, DATA, LE), the register maps and bit definitions differ because the ADF4001BCPZ includes VCO control and additional configuration bits. Firmware written for one device cannot be reused directly without modification.
Which device is better suited for low-phase-noise applications?
The ADF4002BCPZ, when paired with a high-performance external VCO, typically achieves lower phase noise because the VCO can be selected independently. The ADF4001BCPZ has an integrated VCO whose phase noise is fixed by the internal design. For demanding low-phase-noise requirements, the ADF4002BCPZ with an external VCO is generally preferred.
What are the supply voltage and power consumption differences?
Both devices operate from a 3.0 V to 3.6 V supply. The ADF4002BCPZ typically consumes less power because it does not include an internal VCO. The ADF4001BCPZ consumes additional current for the integrated VCO. Exact current consumption values must be taken from the respective manufacturer datasheets.
Can the ADF4002BCPZ be used as a direct substitute for the ADF4001BCPZ in an existing design?
No. Because the ADF4001BCPZ includes an internal VCO and has a different pinout, register map, and external component requirements, the ADF4002BCPZ cannot be used as a direct substitute. A redesign of the PCB, firmware, and loop filter is required.
What package type do both devices use?
Both the ADF4002BCPZ and ADF4001BCPZ are offered in a 20-lead LFCSP (lead frame chip scale package). However, the pin assignments differ between the two devices, so the package outline is similar but not functionally interchangeable.