Part A
ADF4106BRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4854 PCS
- Package
- TSSOP-16
- Series
- Horário - Geradores de relógios, PLLs, Sintetizadores de Frequências
Replacement verdict
Compatible functional replacement candidate
The ADF4118BRUZ and ADF4106BRU are both single PLL frequency synthesizers in TSSOP-16 packages with a 3-wire serial interface and comparable supply ranges, making them a viable functional replacement candidate. However, the ADF4118BRUZ offers a higher maximum RF input frequency and a wider operating temperature range, while the ADF4106BRU provides a higher maximum PFD frequency. Designers should validate loop filter and reference divider settings against the target application before substituting.
Package Type
High match
Supply Voltage Range
High match
Maximum RF Input Frequency
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADF4118BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7756 PCS
- Package
- TSSOP-16
- 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 | ADF4118BRUZ | ADF4106BRU | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 3 GHz | 6 GHz | Determines the highest RF input frequency the PLL can lock to; the ADF4106 supports higher-frequency VCOs and applications. |
| Normalized Phase Noise Floor | -219 dBc/Hz | -219 dBc/Hz | Sets the baseline phase noise contribution of the PLL; identical floors mean similar noise performance when loop parameters are matched. |
| Maximum RF Input Frequency (Prescaler) | 3 GHz | 6 GHz | The prescaler limits the usable input range; a higher-rated prescaler enables operation with higher-frequency sources. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 3.3 V | Defines the compatible power rail; matching ranges allow drop-in use in the same 3 V system designs. |
| Package / Pin Count | 16-Lead TSSOP | 16-Lead TSSOP | Identical package and pin count support the same PCB footprint and layout, easing substitution. |
| Charge Pump Current (Programmable) | Up to 5 mA | Up to 5 mA | Affects loop filter design and lock time; matching maximum charge pump current simplifies loop filter reuse. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts are rated for the same industrial temperature environments. |
| Reference Input Frequency | Up to 250 MHz | Up to 250 MHz | Determines the allowable reference clock rate; identical limits allow the same reference source to be used. |
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 | ADF4106BRU | ADF4118BRUZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Type | Clock/Frequency Synthesizer (RF) | Clock/Frequency Synthesizer (RF) |
| PLL | Yes | Yes |
| 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 | 6GHz | 3GHz |
| Divider / Multiplier | Yes/No | Yes/No |
| Voltage - Supply | 2.7V ~ 3.3V | 2.7V ~ 5.5V |
| 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 ADF4118BRUZ and the ADF4106BRU?
The ADF4118BRUZ is a single integer-N PLL frequency synthesizer specified for RF operation up to 3.0 GHz, while the ADF4106BRU is specified up to 6.0 GHz. Both are housed in 16-lead TSSOP packages and share a similar 3-wire serial interface, but the ADF4106BRU offers a higher maximum RF input frequency and a lower normalized phase noise floor, making it better suited to higher-frequency applications.
Are the ADF4118BRUZ and ADF4106BRU pin-compatible?
Yes. Both devices are offered in the same 16-lead TSSOP (RU) package with the same pinout, so they are pin-compatible at the package level. However, pin compatibility does not guarantee functional interchangeability; the surrounding loop filter, reference frequency, and VCO must be revalidated for the target design.
What is the maximum RF input frequency for each device?
The ADF4118BRUZ is specified for RF input frequencies up to 3.0 GHz. The ADF4106BRU is specified for RF input frequencies up to 6.0 GHz. Designs operating above 3.0 GHz must use the ADF4106BRU or another device rated for the required frequency.
How do the phase noise specifications compare?
The ADF4106BRU has a lower normalized phase noise floor than the ADF4118BRUZ, which generally translates to better in-band phase noise performance when the loop filter and other conditions are equivalent. The ADF4118BRUZ remains suitable for applications where its phase noise performance meets the system requirement at frequencies up to 3.0 GHz.
Do both devices use the same serial interface and register structure?
Both devices use a 3-wire serial interface (CLK, DATA, LE) and are programmed through similar control registers. However, the register maps and bit definitions are not identical, so firmware and initialization sequences must be checked against each device's datasheet before substitution.
Can the ADF4106BRU directly replace the ADF4118BRUZ in an existing design?
A direct replacement is possible only after verifying that the higher 6.0 GHz rating, the different phase noise performance, and the register map differences are acceptable for the application. The loop filter, charge pump settings, and firmware must be revalidated against the ADF4106BRU datasheet; the substitution should not be assumed to be plug-and-play.
What supply voltage and package do these devices share?
Both the ADF4118BRUZ and the ADF4106BRU operate from a nominal 3.0 V to 3.6 V supply and are offered in a 16-lead TSSOP package. The shared supply range and package simplify board-level migration, but electrical and functional differences still require design verification.