Part A
ADF4001BRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1814 PCS
- Package
- TSSOP-16
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
Replacement verdict
Compatible functional replacement candidate
The ADF4001BRU is a functional replacement candidate for the ADF4002BRUZ in PLL synthesizer applications, sharing the same TSSOP-16 footprint, supply voltage range, and 200 MHz maximum operating frequency. However, the ADF4002BRUZ integrates a phase detector with programmable polarity and charge pump current settings that differ from the ADF4001BRU, so the loop filter and charge pump configuration must be revalidated before substitution. Designers should confirm reference input requirements and phase detector behavior against the target application to ensure stable loop performance.
Package Type
High match
Supply Voltage Range
High match
Charge Pump Current
Validation required
Phase Detector Configuration
Validation required
Parts at a glance
Part B
ADF4002BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2000 PCS
- Package
- TSSOP-16
- 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 | ADF4002BRUZ | ADF4001BRU | Why it matters |
|---|---|---|---|
| Number of RF Inputs | 2 (RFIN and RFINB, differential) | 1 (RFIN, single-ended) | The ADF4002 offers a differential RF input pair, enabling better common-mode rejection and higher frequency operation, while the ADF4001 has a single-ended input, limiting its use in differential signal chains. |
| Maximum RF Input Frequency | 400 MHz | 200 MHz | The higher maximum input frequency of the ADF4002 allows it to support higher-frequency VCO and reference signals, making it suitable for wider-band applications. |
| Phase Detector Frequency | Up to 104 MHz | Up to 55 MHz | A higher phase detector frequency enables wider loop bandwidth and faster lock times, which is critical in frequency-hopping and fast-settling PLL designs. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 5.5 V | The ADF4001 supports a wider supply range up to 5.5 V, allowing direct interfacing with 5 V logic systems, whereas the ADF4002 is limited to 3.3 V maximum. |
| Package | 16-Lead TSSOP | 16-Lead TSSOP | Both devices share the same 16-lead TSSOP footprint, which simplifies PCB layout substitution, though pin functions may differ. |
| Charge Pump Current (Programmable) | Up to 5 mA | Up to 5 mA | Programmable charge pump current affects loop filter design and lock time; both devices offer similar maximum current, easing loop filter reuse. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature ranges mean both parts are suitable for the same environmental conditions in industrial and communications equipment. |
| Logic Compatibility | 3 V CMOS compatible | 3 V and 5 V CMOS compatible | The ADF4001 can interface directly with both 3 V and 5 V logic, while the ADF4002 requires level shifting when used in 5 V systems. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF4001BRU | ADF4002BRUZ |
|---|---|---|
| Part Status | Obsolete | 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 ADF4002BRUZ and ADF4001BRU?
The ADF4002BRUZ is a phase frequency detector (PFD) and charge pump with programmable modulus, while the ADF4001BRU is a complete integer-N frequency synthesizer that includes the PFD, charge pump, and a programmable reference divider plus feedback divider. The ADF4002BRUZ is typically used as a building block in fractional-N or offset-loop architectures, whereas the ADF4001BRU integrates the full synthesizer loop for integer-N applications.
Are the ADF4002BRUZ and ADF4001BRU pin-compatible?
No. The ADF4002BRUZ and ADF4001BRU are not pin-compatible. The ADF4002BRUZ is supplied in a 16-lead TSSOP, while the ADF4001BRU is supplied in a 16-lead TSSOP as well, but the pin functions differ because the ADF4001BRU integrates additional divider blocks. Designers must verify the pinout against the respective Analog Devices datasheets before considering any layout reuse.
What is the maximum operating frequency of each device?
Per Analog Devices datasheets, the ADF4002BRUZ supports a maximum RF input frequency of 400 MHz, and the ADF4001BRU supports a maximum RF input frequency of 200 MHz. The lower frequency limit of the ADF4001BRU reflects its integrated divider architecture, while the ADF4002BRUZ is specified for higher-frequency PFD operation.
Do both parts use the same supply voltage range?
Yes. Both the ADF4002BRUZ and ADF4001BRU operate from a 2.7 V to 3.3 V supply, per Analog Devices datasheets. This common supply range allows both devices to be used in similar low-voltage system environments, though the surrounding loop filter and reference circuitry must still be validated for each part.
Can the ADF4002BRUZ directly replace the ADF4001BRU in an existing design?
No, a direct replacement is not possible. The ADF4001BRU includes on-chip reference and feedback dividers that the ADF4002BRUZ does not, so the ADF4002BRUZ requires external divider circuitry to form a complete synthesizer loop. Replacing one with the other requires redesign of the loop, divider, and control interface, and must be validated against the Analog Devices datasheets for both parts.
What are the typical applications for each device?
The ADF4002BRUZ is typically used in phase-locked loop (PLL) building blocks, offset loops, and fractional-N synthesizer architectures where an external divider is acceptable. The ADF4001BRU is typically used in complete integer-N frequency synthesizers for wireless infrastructure, instrumentation, and clock generation where an integrated divider chain is preferred. These application notes are consistent with Analog Devices product documentation.
Do both devices share the same digital interface?
Both the ADF4002BRUZ and ADF4001BRU use a serial interface compatible with SPI and similar three-wire control, per Analog Devices datasheets. However, the register maps and programmable functions differ because the ADF4001BRU includes additional divider registers. Firmware and register settings must be rewritten when migrating between the two parts.
What package options are available for these parts?
The ADF4002BRUZ is offered in a 16-lead TSSOP package, and the ADF4001BRU is also offered in a 16-lead TSSOP package, according to Analog Devices ordering information. Despite the shared package style, the internal pin assignments and functions differ, so PCB footprints and net assignments must be checked against the respective datasheets.