Part A
ADF4106BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2980 PCS
- Package
- TSSOP-16
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
Replacement verdict
Compatible functional replacement candidate
The ADF4106BRUZ and ADF4153BRU are both integer-N PLL frequency synthesizers in a common TSSOP-16 package, making the ADF4153BRU a viable functional replacement candidate for the ADF4106BRUZ in many designs. However, the two devices differ in maximum operating frequency, fractional-N capability, and reference input requirements, so the replacement must be validated against the target application's frequency plan and loop filter design before adoption.
Package Type
High match
Maximum Operating Frequency
Validation required
Synthesizer Architecture
Not compatible
Supply Voltage Range
Validation required
Parts at a glance
Part B
ADF4153BRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6126 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 | ADF4106BRUZ | ADF4153BRU | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 6 GHz | 4 GHz | Determines the highest RF input frequency the PLL can synthesize; the ADF4106 covers higher-frequency bands. |
| Number of Programmable Modulus Bits | Not applicable (integer-N only) | Fractional-N with programmable modulus | Fractional-N capability allows finer frequency resolution and lower phase noise trade-offs versus integer-N architecture. |
| RF Input Frequency Range | 0.5 GHz to 6 GHz | 0.5 GHz to 4 GHz | Defines the usable tuning range; the ADF4106 supports higher bands while both share the same lower limit. |
| Phase Detector Frequency | Up to 104 MHz | Up to 32 MHz | Higher phase detector frequency enables wider loop bandwidth and faster settling in the ADF4106. |
| 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, easing direct board-level substitution. |
| Package | 16-Lead TSSOP | 16-Lead TSSOP | Identical package and pin count simplify PCB footprint reuse between the two parts. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching industrial temperature ratings ensure equivalent environmental robustness. |
| Charge Pump Current | Programmable, up to 5 mA | Programmable, up to 5 mA | Similar charge pump drive capability supports comparable loop filter design and lock time performance. |
| PLL Architecture | Integer-N | Fractional-N | Architecture difference affects frequency resolution, spurious performance, and suitability for fine-step synthesis. |
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 | ADF4106BRUZ | ADF4153BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Clock/Frequency Synthesizer (RF) | Fractional N 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 | 4GHz |
| Divider / Multiplier | Yes/No | No/Yes |
| Voltage - Supply | 2.7V ~ 3.3V | 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 ADF4106BRUZ and the ADF4153BRU?
The ADF4106BRUZ is a 6 GHz integer-N PLL frequency synthesizer with a programmable dual-modulus prescaler (8/9, 16/17, 32/33, 64/65) and a 14-bit reference counter, housed in a 16-lead TSSOP. The ADF4153BRU is a fractional-N PLL synthesizer operating up to 4 GHz with a 25-bit fixed modulus and programmable fractional interpolation, also in a 16-lead TSSOP. The primary differences are the maximum RF input frequency (6 GHz vs 4 GHz), the synthesis architecture (integer-N vs fractional-N), and the resulting phase noise and resolution trade-offs.
Are the ADF4106BRUZ and ADF4153BRU pin-compatible?
Both devices are offered in a 16-lead TSSOP (RU suffix) package, but pin compatibility must be confirmed against the respective manufacturer datasheets. The ADF4106 and ADF4153 have different register maps and control interfaces, so even where package footprints align, the pin functions and serial programming are not interchangeable without design changes.
What is the maximum RF input frequency for each device?
The ADF4106BRUZ supports RF input frequencies up to 6 GHz. The ADF4153BRU supports RF input frequencies up to 4 GHz. Designs requiring operation above 4 GHz must use the ADF4106BRUZ or another device rated for the target frequency.
Which device offers finer frequency resolution?
The ADF4153BRU, as a fractional-N synthesizer, provides finer frequency resolution than the integer-N ADF4106BRUZ. The ADF4106BRUZ resolution is set by the phase detector frequency divided by the integer modulus, whereas the ADF4153BRU uses fractional interpolation to achieve sub-integer step sizes, making it preferable for applications requiring fine channel spacing.
How do the phase noise characteristics compare?
Integer-N synthesizers such as the ADF4106BRUZ typically achieve lower in-band phase noise for a given phase detector frequency because they avoid fractional spurs and the noise contribution of a sigma-delta modulator. The ADF4153BRU, being fractional-N, can exhibit fractional spurs and higher in-band noise unless mitigated by design techniques. Exact phase noise figures should be taken from the respective manufacturer datasheets under specified conditions.
What supply voltage and current consumption do these devices require?
Both the ADF4106BRUZ and ADF4153BRU operate from a nominal 3.0 V to 3.6 V supply. Typical supply current for the ADF4106BRUZ is approximately 11 mA, while the ADF4153BRU typically draws approximately 20 mA. Designers should verify exact values against the latest manufacturer datasheets for the specific operating conditions.
Can the ADF4153BRU directly replace the ADF4106BRUZ in an existing design?
No. Although both are 16-lead TSSOP PLL synthesizers, they differ in maximum frequency (4 GHz vs 6 GHz), synthesis architecture (fractional-N vs integer-N), register map, and serial programming format. A direct drop-in replacement is not possible without redesigning the loop filter, updating firmware for the different register structure, and revalidating RF performance.
Which device is better suited for low-spur applications?
The ADF4106BRUZ, as an integer-N synthesizer, generally produces lower fractional spurs because it does not employ fractional interpolation. The ADF4153BRU can generate fractional spurs that may require additional filtering or spur mitigation. For applications with stringent spur requirements and channel spacing compatible with integer-N operation, the ADF4106BRUZ is typically preferred.