Part A
ADF4001BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1703 PCS
- Package
- WFQFN-20
- Series
- Horário - Geradores de relógios, PLLs, Sintetizadores de Frequências
Replacement verdict
Compatible functional replacement candidate
The ADF4001BCPZ is a functional replacement candidate for the ADF4002BCPZ-RL7 in PLL synthesizer applications, sharing the same 20-lead LFCSP package, supply voltage range, and 3-wire serial interface, though the designer must validate the differing maximum operating frequency, phase detector frequency, and reference input requirements against the target design.
Package Type
High match
Supply Voltage Range
High match
Maximum Operating Frequency
Validation required
Phase Detector Frequency
Validation required
Parts at a glance
Part B
ADF4002BCPZ-RL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7422 PCS
- Package
- WFQFN-20
- Series
- Horário - Geradores de relógios, PLLs, Sintetizadores de Frequências
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-RL7 | ADF4001BCPZ | Why it matters |
|---|---|---|---|
| Maximum RF Input Frequency | 400 MHz | 200 MHz | Determines the highest reference or feedback frequency the PLL can accept; the ADF4002 supports twice the input frequency of the ADF4001. |
| Number of Programmable Counters | Dual (R and N counters) | Single (N counter only) | The ADF4002 includes both reference (R) and feedback (N) counters, enabling full fractional-N style flexibility, while the ADF4001 has only an N counter. |
| Phase Detector Frequency | Up to 104 MHz | Up to 55 MHz | Higher phase detector frequency allows wider loop bandwidth and faster lock times; the ADF4002 supports nearly double the ADF4001's PFD rate. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 5.5 V | The ADF4001 tolerates a wider supply range including 5 V systems, while the ADF4002 is limited to 3.3 V maximum. |
| Package | 20-Lead LFCSP | 20-Lead LFCSP | Both use the same 20-lead LFCSP footprint, but the ADF4002 variant is supplied in tape-and-reel (RL7) packaging for automated assembly. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range means both parts are interchangeable in the same thermal environments. |
| Charge Pump Current (Programmable) | Up to 5 mA | Up to 5 mA | Matching charge pump current ranges allow similar loop filter design and comparable phase noise performance. |
| Interface | 3-wire serial (SPI-compatible) | 3-wire serial (SPI-compatible) | Both use the same serial programming interface, simplifying firmware reuse when substituting one for the other. |
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-RL7 |
|---|---|---|
| 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 are the key differences between the ADF4002BCPZ-RL7 and the ADF4001BCPZ?
The ADF4002BCPZ-RL7 is a 400 MHz PLL frequency synthesizer with an integrated phase detector and programmable charge pump, while the ADF4001BCPZ is a 200 MHz PLL frequency synthesizer with similar architecture but lower maximum operating frequency. Both are offered in 20-lead LFCSP packages, but the ADF4002 supports higher reference and RF input frequencies and includes a programmable dual-modulus prescaler, whereas the ADF4001 is limited to lower frequency operation.
Are the ADF4002BCPZ-RL7 and ADF4001BCPZ pin-compatible?
Both devices are packaged in a 20-lead LFCSP (CP-20-1) with the same pin count and footprint, but pin functions and internal register maps differ. The ADF4002 and ADF4001 are not drop-in replacements; the PCB layout may be shared, but the surrounding circuitry and software configuration must be redesigned for each part.
What is the maximum RF input frequency for each device?
The ADF4002BCPZ-RL7 supports RF input frequencies up to 400 MHz, while the ADF4001BCPZ supports RF input frequencies up to 200 MHz. The reference input frequency for both devices is specified up to 100 MHz.
Do both parts use the same serial interface for programming?
Yes, both the ADF4002BCPZ-RL7 and ADF4001BCPZ use a 3-wire serial interface (CLK, DATA, LE) for programming the internal registers. However, the register maps and bit definitions differ between the two devices, so firmware written for one part cannot be used directly with the other without modification.
What are the supply voltage and power consumption specifications?
Both the ADF4002BCPZ-RL7 and ADF4001BCPZ operate from a 3.0 V to 3.6 V supply. The ADF4002 typically draws about 7 mA, while the ADF4001 typically draws about 5 mA, depending on the programmed charge pump current and operating conditions.
Can the ADF4001BCPZ be used as a direct replacement for the ADF4002BCPZ-RL7 in an existing design?
No. Although both are 20-lead LFCSP PLL synthesizers, the ADF4001BCPZ has a lower maximum RF input frequency (200 MHz vs. 400 MHz) and a different register map. A direct substitution would require verifying that the system's RF frequency, loop filter design, and software configuration are compatible with the ADF4001 specifications.
What is the difference in phase detector frequency and charge pump current between the two parts?
Both devices feature a programmable phase detector and charge pump. The ADF4002BCPZ-RL7 offers a maximum phase detector frequency of 100 MHz, while the ADF4001BCPZ is specified for a maximum phase detector frequency of 55 MHz. Charge pump current is programmable in both devices, but the available current settings and register encoding differ.