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 ADF4002SRU-EP is a functionally compatible replacement candidate for the ADF4001BRU, sharing the same PLL synthesizer architecture, 16-lead TSSOP footprint, and 3 V supply range, while offering an extended operating temperature range suitable for enhanced reliability applications. Designers should validate loop filter component values and reference input configuration against the target application before substitution.
Function Architecture
High match
Package Type
High match
Supply Voltage Range
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADF4002SRU-EP
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3599 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 | ADF4001BRU | ADF4002SRU-EP | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 200 MHz | 400 MHz | Determines the highest input frequency the PLL synthesizer can accept; a higher limit allows use in higher-frequency RF designs. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 3.3 V | Defines the compatible power supply; the wider range of the ADF4001 allows 5 V operation, while the ADF4002-EP is limited to 3.3 V systems. |
| Normalized Phase Noise Floor | -222 dBc/Hz | -222 dBc/Hz | Indicates the inherent noise contribution of the PLL; lower values yield cleaner synthesized signals. |
| Maximum RF Input Frequency (PFD) | 200 MHz | 400 MHz | Sets the maximum phase-frequency detector rate, which affects loop bandwidth and reference frequency options. |
| Operating Temperature Range | -40 °C to +85 °C | -55 °C to +125 °C | The extended temperature range of the ADF4002-EP makes it suitable for harsh-environment and military/aerospace applications. |
| Package / Pin Count | 16-Lead TSSOP | 16-Lead TSSOP | Identical package and pinout enable drop-in board compatibility between the two parts. |
| Charge Pump Current (Programmable) | Up to 5 mA | Up to 5 mA | Charge pump current affects loop filter design and lock time; matching values simplify substitution. |
| Interface Type | 3-Wire Serial (SPI-compatible) | 3-Wire Serial (SPI-compatible) | Same programming interface allows reuse of existing microcontroller firmware and control logic. |
| Enhanced Product (EP) Qualification | Standard commercial grade | Enhanced product, controlled manufacturing baseline | EP parts offer tighter process control and traceability, important for high-reliability and defense applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF4001BRU | ADF4002SRU-EP |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| 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 | -55°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADF4001BRU and ADF4002SRU-EP?
The ADF4001BRU is a standard PLL frequency synthesizer in a 16-lead TSSOP package, while the ADF4002SRU-EP is an enhanced-product variant of the ADF4002 family in a 16-lead TSSOP, specified for extended temperature operation and controlled for aerospace/defense applications. The ADF4002SRU-EP is a higher-performance device with a maximum RF input frequency of 400 MHz versus 200 MHz for the ADF4001, and it offers improved phase noise and lower spurious performance. The ADF4002SRU-EP also supports a higher maximum PFD frequency and includes a programmable charge pump current range. Designers should consult the respective datasheets for exact electrical limits before substitution.
What is the maximum RF input frequency for each device?
The ADF4001BRU has a maximum RF input frequency of 200 MHz. The ADF4002SRU-EP has a maximum RF input frequency of 400 MHz. These values are specified in the respective manufacturer datasheets and should be observed when selecting the device for a given VCO or reference frequency.
Are the ADF4001BRU and ADF4002SRU-EP pin-compatible?
Both devices are offered in a 16-lead TSSOP package, but pin compatibility must be verified against the pin function descriptions in each datasheet. The ADF4002SRU-EP includes additional control and interface pins (such as the CE pin and additional charge pump configuration) that may not map identically to the ADF4001BRU pinout. A direct drop-in replacement should not be assumed without confirming pin functions and PCB land patterns.
What is the difference in phase noise performance between the two parts?
The ADF4002SRU-EP is specified with lower normalized phase noise floor than the ADF4001BRU, making it more suitable for applications requiring tighter spectral purity. The ADF4001BRU provides a normalized phase noise floor suitable for general-purpose frequency synthesis. Exact phase noise figures depend on PFD frequency, charge pump current, and loop filter design, and should be taken from the manufacturer datasheets for the specific operating conditions.
What does the "EP" suffix on the ADF4002SRU-EP indicate?
The "EP" suffix denotes an enhanced product designation. Enhanced products are controlled for aerospace and defense applications and are specified over an extended operating temperature range, typically -55°C to +125°C. The ADF4002SRU-EP is manufactured and tested to meet these enhanced requirements, which distinguishes it from standard commercial-grade parts such as the ADF4001BRU.
What is the operating temperature range for each device?
The ADF4001BRU is specified for the standard industrial temperature range of -40°C to +85°C. The ADF4002SRU-EP, as an enhanced product, is specified over the extended temperature range of -55°C to +125°C. This difference is critical for applications exposed to extreme environmental conditions.
Can the ADF4001BRU be replaced by the ADF4002SRU-EP in an existing design?
Replacement is not a simple drop-in substitution. Although both are 16-lead TSSOP PLL synthesizers, the ADF4002SRU-EP offers a higher maximum RF input frequency (400 MHz vs 200 MHz), different charge pump current settings, and additional control features. The loop filter, charge pump current, and register programming must be recalculated and validated for the target PFD frequency and VCO. The design should be re-verified against the ADF4002SRU-EP datasheet before substitution.
What charge pump current ranges do these devices support?
The ADF4001BRU supports a programmable charge pump current with typical settings up to 5 mA. The ADF4002SRU-EP supports a programmable charge pump current with a wider range, typically up to 5 mA with finer programmability. Exact current values and register settings should be confirmed from the respective manufacturer datasheets, as the charge pump current directly affects loop filter design and lock time.