Part A
ADF4001BRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1814 Stückzahl
- Package
- TSSOP-16
- Series
- Clock-Timing mit Taktgeneratoren, PLLs, Frequenzsynthesizer
Replacement verdict
Compatible functional replacement candidate
The ADF4001BRU can serve as a functional replacement candidate for the ADF4002BRUZ-RL7 in many PLL synthesizer designs, since both share the same TSSOP-16 footprint, 3 V to 5.5 V supply range, and 400 MHz maximum operating frequency. However, the ADF4002BRUZ-RL7 integrates an on-chip phase detector with programmable polarity and charge-pump current settings that differ from the ADF4001BRU, so loop-filter and lock-detect behavior must be revalidated before committing to a drop-in substitution.
Package Type
High match
Operating Frequency
High match
Supply Voltage Range
High match
Charge Pump Current
Validation required
Parts at a glance
Part B
ADF4002BRUZ-RL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4079 Stückzahl
- Package
- TSSOP-16
- 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 | ADF4002BRUZ-RL7 | ADF4001BRU | Why it matters |
|---|---|---|---|
| Function | PLL frequency synthesizer with integrated phase detector, charge pump, and programmable reference divider (no integrated VCO) | PLL frequency synthesizer with integrated phase detector, charge pump, and programmable reference divider (no integrated VCO) | Both are fractional/integer-N synthesizer building blocks; functional role is essentially the same, so this is not a differentiator. |
| Maximum RF Input Frequency | 400 MHz | 200 MHz | Determines the highest frequency the prescaler/PFD can accept; the ADF4002 supports higher input frequencies, affecting usable VCO range. |
| Maximum PFD Frequency | 104 MHz | 55 MHz | Higher phase-frequency detector rate enables wider loop bandwidth and lower phase noise; a key performance differentiator. |
| Programmable Charge Pump Current | Yes (programmable, up to ~5 mA) | Yes (programmable, up to ~5 mA) | Charge pump current setting affects loop filter design and lock time; both offer programmability, so this is not a differentiator. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 3.3 V | Both operate from the same low-voltage supply, so power-rail compatibility is identical. |
| Package | 16-lead TSSOP | 16-lead TSSOP | Same footprint and pin count, so board-level substitution is mechanically straightforward. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature rating, so environmental compatibility is the same. |
| Serial Interface | 3-wire SPI-compatible | 3-wire SPI-compatible | Same control interface, so firmware/register programming approach is compatible. |
| RoHS / Packaging Suffix | RoHS-compliant, tape-and-reel (RL7) | RoHS-compliant, tube/standard (BRU) | Both are RoHS-compliant, but the reel vs. tube packaging affects manufacturing handling and inventory form. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF4001BRU | ADF4002BRUZ-RL7 |
|---|---|---|
| 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-RL7 and the ADF4001BRU?
The ADF4002BRUZ-RL7 is a 400 MHz PLL frequency synthesizer with an integrated phase detector and programmable charge pump, while the ADF4001BRU is a 200 MHz PLL frequency synthesizer with similar architecture but lower maximum operating frequency. The ADF4002 offers a higher RF input frequency range and is supplied in a 20-lead TSSOP package in tape-and-reel format (RL7), whereas the ADF4001BRU is supplied in a 16-lead TSSOP package in tube format.
Are the ADF4002BRUZ-RL7 and ADF4001BRU pin-compatible?
No. The ADF4002BRUZ-RL7 uses a 20-lead TSSOP package, while the ADF4001BRU uses a 16-lead TSSOP package. The different pin counts and pin assignments mean they are not drop-in replacements for each other, and PCB layouts must be designed accordingly.
What is the maximum RF input frequency for each device?
The ADF4002BRUZ-RL7 supports a maximum RF input frequency of 400 MHz. The ADF4001BRU supports a maximum RF input frequency of 200 MHz. Designs requiring operation above 200 MHz should use the ADF4002.
Do both devices share the same charge pump and phase detector architecture?
Yes. Both the ADF4002BRUZ-RL7 and ADF4001BRU integrate a digital phase frequency detector (PFD) and a programmable charge pump. Both devices support programmable charge pump currents and are intended for integer-N PLL synthesizer applications. However, the ADF4002 provides a higher maximum PFD and RF operating frequency than the ADF4001.
What supply voltage range do these PLL synthesizers require?
Both the ADF4002BRUZ-RL7 and ADF4001BRU operate from a nominal 3 V supply, with an operating range of 2.7 V to 3.3 V. The digital interface and charge pump supply (VDD) should be decoupled according to the manufacturer datasheet recommendations.
How do the package and ordering formats differ between the two parts?
The ADF4002BRUZ-RL7 is supplied in a 20-lead TSSOP package and the "RL7" suffix indicates tape-and-reel packaging with 1,000 units per reel. The ADF4001BRU is supplied in a 16-lead TSSOP package in tube format. The "Z" suffix on the ADF4002BRUZ-RL7 indicates RoHS-compliant lead-free construction.
Can the ADF4001BRU be used as a lower-cost alternative to the ADF4002BRUZ-RL7?
Only if the target design operates at or below 200 MHz RF input and the 16-lead TSSOP footprint is acceptable. Because the two devices differ in package pin count, maximum frequency, and ordering format, a direct substitution requires a PCB redesign and full validation against the ADF4001 datasheet. The ADF4002BRUZ-RL7 should be retained where 400 MHz operation or the 20-lead TSSOP layout is required.