Part A
ADF4153ABRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6452 Stückzahl
- Package
- TSSOP-16
- Series
- Clock-Timing mit Taktgeneratoren, PLLs, Frequenzsynthesizer
Replacement verdict
Compatible functional replacement candidate
The ADF4153ABRUZ and ADF4111BRU are both fractional-N PLL frequency synthesizers in a TSSOP-16 package with a maximum operating frequency of 4 GHz, making the ADF4153ABRUZ a viable functional replacement candidate for the ADF4111BRU in many designs. However, the ADF4153ABRUZ offers a wider supply voltage range and a higher maximum RF input frequency, while the ADF4111BRU provides a higher maximum phase detector frequency. Designers should validate supply voltage, phase detector frequency, and reference input requirements against the target application before substituting.
Package Type
High match
Maximum RF Input Frequency
High match
Supply Voltage Range
Validation required
Maximum Phase Detector Frequency
Validation required
Parts at a glance
Part B
ADF4111BRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3388 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 | ADF4153ABRUZ | ADF4111BRU | Why it matters |
|---|---|---|---|
| Function Type | Fractional-N frequency synthesizer | Integer-N frequency synthesizer | Fractional-N allows finer frequency resolution without changing the reference frequency, while integer-N requires the reference to be an integer multiple of the output step. |
| Maximum RF Input Frequency | 4 GHz | 4 GHz | Both support the same upper RF input frequency, so they cover the same high-frequency band for the VCO input. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 3.3 V | Identical supply requirements mean the same power rail design can be reused for either part. |
| Package | 16-Lead TSSOP | 16-Lead TSSOP | Same package and pin count allow drop-in board layout compatibility between the two devices. |
| Modulus / Fractional Resolution | Fractional (programmable modulus) | Integer-N only | Fractional capability enables much finer channel spacing and lower phase noise trade-offs, which integer-N parts cannot achieve without changing the reference. |
| Phase Detector Frequency | Up to 32 MHz | Up to 55 MHz | A higher phase detector frequency generally allows wider loop bandwidth and faster settling, affecting lock time and noise performance. |
| Programmable Charge Pump Current | Yes (programmable) | Yes (programmable) | Both allow loop filter optimization through charge pump current adjustment, supporting flexible PLL loop design. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean equivalent environmental robustness for industrial applications. |
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 | ADF4153ABRUZ | ADF4111BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Fractional N 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 | 4GHz | 1.4GHz |
| Divider / Multiplier | No/Yes | 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 ADF4153ABRUZ and the ADF4111BRU?
The ADF4153ABRUZ is a fractional-N frequency synthesizer with an integrated VCO, while the ADF4111BRU is an integer-N PLL synthesizer without an integrated VCO. The ADF4153ABRUZ supports fractional-N operation for finer frequency resolution, whereas the ADF4111BRU uses integer-N architecture requiring a separate external VCO.
Are the ADF4153ABRUZ and ADF4111BRU pin-compatible?
No. The ADF4153ABRUZ is supplied in a 20-lead TSSOP package, while the ADF4111BRU is supplied in a 16-lead TSSOP package. The different pin counts and pin functions mean they are not pin-compatible and cannot be dropped into the same PCB footprint.
What is the maximum operating frequency of each device?
The ADF4153ABRUZ operates with an RF input frequency up to 4 GHz. The ADF4111BRU operates with an RF input frequency up to 1.2 GHz. The higher frequency capability of the ADF4153ABRUZ makes it suitable for higher-band applications.
Do both devices require an external VCO?
No. The ADF4153ABRUZ includes an integrated voltage-controlled oscillator, reducing external component count. The ADF4111BRU is a PLL synthesizer only and requires an external VCO to complete the frequency synthesis loop.
What are the supply voltage requirements for these devices?
Both the ADF4153ABRUZ and the ADF4111BRU operate from a nominal 3 V supply, with an operating range of 2.7 V to 3.3 V. This allows both devices to be used in low-voltage digital systems.
Can the ADF4111BRU be used as a direct replacement for the ADF4153ABRUZ?
No. The devices differ in architecture (integer-N vs fractional-N), package size (16-lead vs 20-lead TSSOP), maximum RF frequency (1.2 GHz vs 4 GHz), and VCO integration. A direct replacement is not possible without redesigning the frequency synthesis loop and PCB layout.
Which device is better suited for fine frequency resolution applications?
The ADF4153ABRUZ is better suited for fine frequency resolution because its fractional-N architecture allows step sizes smaller than the phase detector frequency. The ADF4111BRU, being integer-N, has a frequency resolution limited to the phase detector comparison frequency.