Part A
ADF4106BRU
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4854 PCS
- Package
- TSSOP-16
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
Replacement verdict
Compatible functional replacement candidate
The ADF4153ABRUZ and ADF4106BRU are both fractional-N PLL frequency synthesizers in TSSOP-16 packages with a 3-wire SPI-compatible interface and comparable supply voltage ranges, making them a viable functional replacement candidate. However, the ADF4153ABRUZ offers a higher maximum RF input frequency and integrated RF prescaler options, while the ADF4106BRU provides a wider operating temperature range and different phase noise characteristics. Designers should validate loop filter design, charge pump current settings, and reference frequency requirements before substituting one for the other in a given application.
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
ADF4153ABRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6452 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 | ADF4153ABRUZ | ADF4106BRU | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 4 GHz | 6 GHz | Determines the highest RF input frequency the PLL can synthesize; the ADF4106 supports higher-frequency VCOs and applications. |
| Number of Programmable Modulus Bits | 4-bit (fractional) | Integer-N only | Fractional-N capability enables finer frequency resolution and lower phase noise for a given reference, which the integer-N ADF4106 cannot provide. |
| RF Input Frequency Range | 0.5 GHz to 4 GHz | 0.5 GHz to 6 GHz | Defines the usable VCO/input band; the wider range of the ADF4106 allows operation with higher-frequency sources. |
| 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 maintained between the two parts. |
| Package Type | 16-Lead TSSOP | 16-Lead TSSOP | Identical package and pin count simplify board-level substitution and layout reuse. |
| Normalized Phase Noise Floor | -216 dBc/Hz (fractional) | -219 dBc/Hz (integer) | Phase noise floor affects spectral purity of the synthesized signal; the integer-N device offers a lower normalized floor. |
| Programmable Charge Pump Current | 0.625 mA to 5 mA | 0.625 mA to 5 mA | Charge pump current sets loop bandwidth and lock time; matching ranges allow similar loop filter design. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature ratings ensure equivalent environmental robustness for both parts. |
| Digital Interface | 3-wire SPI-compatible serial | 3-wire SPI-compatible serial | Same serial control interface allows reuse of microcontroller firmware and timing with minimal changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF4106BRU | ADF4153ABRUZ |
|---|---|---|
| Part Status | Obsolete | Active |
| 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 ADF4153ABRUZ and the ADF4106BRU?
The ADF4153ABRUZ is a fractional-N frequency synthesizer with an integrated VCO, while the ADF4106BRU is an integer-N PLL frequency synthesizer without an integrated VCO. The ADF4153ABRUZ operates up to 4 GHz with a 25-bit fractional modulus, whereas the ADF4106BRU operates up to 6 GHz with a 16-bit integer N counter. Both are housed in 20-lead TSSOP packages but differ in their synthesizer architecture and frequency range.
Are the ADF4153ABRUZ and ADF4106BRU pin-compatible?
No, the ADF4153ABRUZ and ADF4106BRU are not pin-compatible. Although both use a 20-lead TSSOP package, their pin functions differ due to the ADF4153ABRUZ integrating a VCO and fractional-N circuitry, while the ADF4106BRU is an integer-N PLL requiring an external VCO. Pin assignments must be verified against the respective manufacturer datasheets before any layout consideration.
What is the maximum operating frequency of each device?
The ADF4153ABRUZ supports RF output frequencies up to 4 GHz. The ADF4106BRU supports input frequencies up to 6 GHz. These values are specified in the respective Analog Devices datasheets and should be confirmed against the latest revision for the target design.
Which device is better suited for low phase noise applications?
The ADF4106BRU is generally preferred for low phase noise applications because its integer-N architecture typically yields lower in-band phase noise compared to fractional-N synthesizers. The ADF4153ABRUZ, being fractional-N, offers finer frequency resolution but may exhibit higher phase noise and fractional spurs. Designers should consult the phase noise specifications in both datasheets for the specific operating conditions.
Do both devices require an external loop filter?
Yes, both the ADF4153ABRUZ and ADF4106BRU require an external loop filter. The loop filter design depends on the desired loop bandwidth, phase margin, and reference frequency, and must be calculated according to the application requirements using the guidance provided in the respective Analog Devices datasheets.
What are the supply voltage requirements for these devices?
Both the ADF4153ABRUZ and ADF4106BRU operate from a nominal 3.0 V to 3.6 V supply. The ADF4153ABRUZ also includes an integrated VCO that operates from the same supply range. Exact supply voltage limits and current consumption should be verified in the respective datasheets.
Can the ADF4153ABRUZ replace the ADF4106BRU in an existing design?
No, the ADF4153ABRUZ cannot directly replace the ADF4106BRU. The ADF4153ABRUZ integrates a VCO and uses fractional-N synthesis, while the ADF4106BRU is an integer-N PLL requiring an external VCO. The differences in architecture, pinout, frequency range, and external component requirements mean a redesign of the PLL loop and PCB layout would be necessary.