Part A
ADF4156BRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4703 PCS
- Package
- TSSOP-16
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
Replacement verdict
Compatible functional replacement candidate
The ADF4110BRUZ and ADF4156BRUZ share the same TSSOP-16 package, 3 V supply range, and 3-wire SPI-compatible serial interface, making them viable functional replacement candidates in existing layouts. However, the ADF4156BRUZ offers a higher maximum RF input frequency and a fractional-N architecture versus the integer-N architecture of the ADF4110BRUZ, so loop filter, charge pump current, and register map settings must be revalidated before substitution in a given PLL design.
Package Type
High match
Supply Voltage Range
High match
Maximum RF Input Frequency
Validation required
Synthesizer Architecture
Not compatible
Parts at a glance
Part B
ADF4110BRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2777 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 | ADF4110BRUZ | ADF4156BRUZ | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 4 GHz | 6 GHz | Determines the highest RF output the PLL can synthesize; the ADF4156 supports higher-frequency applications. |
| Fractional-N Capability | Integer-N only | Fractional-N | Fractional-N allows finer frequency resolution and lower phase noise for a given reference, enabling different loop designs. |
| Maximum RF Input Frequency | 4 GHz | 6 GHz | Sets the upper limit of the external VCO signal the prescaler/PLL can accept. |
| Programmable Modulus / Fractional Resolution | Not applicable (integer-N) | 25-bit fractional modulus | Higher fractional resolution reduces spurious levels and allows smaller frequency steps in fractional-N operation. |
| Phase Detector Frequency | Up to 55 MHz | Up to 32 MHz | Affects loop bandwidth, settling time, and in-band phase noise performance. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 3.3 V | Determines compatibility with the system power rail; the ADF4110 tolerates a wider 5 V supply. |
| Package | 16-Lead TSSOP | 16-Lead TSSOP | Same footprint and pin count ease board-level substitution, though pin functions may differ. |
| Normalized Phase Noise Floor | -219 dBc/Hz (typical) | -216 dBc/Hz (typical) | Indicates the intrinsic noise contribution of the PLL, affecting overall synthesizer noise performance. |
| Charge Pump Current (Programmable) | 0.625 mA to 5 mA | 0.312 mA to 5 mA | Charge pump current sets loop gain and affects loop filter design and lock time. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts suit the same industrial temperature environments. |
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 | ADF4156BRUZ | ADF4110BRUZ |
|---|---|---|
| Part Status | Active | Active |
| 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 | 6.2GHz | 550MHz |
| Divider / Multiplier | Yes/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
Are the ADF4110BRUZ and ADF4156BRUZ pin-compatible and directly interchangeable?
No. Both devices are offered in a 16-lead TSSOP package (RUZ suffix), but they are not functionally interchangeable. The ADF4110 is an integer-N PLL synthesizer, while the ADF4156 is a fractional-N PLL synthesizer with a different register map and programming interface. A direct drop-in substitution is not supported; the firmware and loop filter must be redesigned and validated.
What is the maximum RF input frequency of each device?
The ADF4110BRUZ operates with an RF input frequency range of 0.5 GHz to 550 MHz (its specified operating band is up to 550 MHz). The ADF4156BRUZ supports RF input frequencies up to 6 GHz. The ADF4156 therefore covers a substantially higher frequency range than the ADF4110.
How do the synthesizer architectures of the ADF4110BRUZ and ADF4156BRUZ differ?
The ADF4110BRUZ is an integer-N frequency synthesizer, where the output frequency is an integer multiple of the phase detector comparison frequency. The ADF4156BRUZ is a fractional-N synthesizer, allowing fractional division ratios and therefore finer frequency resolution and lower phase detector comparison frequencies for a given channel spacing. This architectural difference affects phase noise, spurious performance, and loop filter design.
What is the maximum phase detector comparison frequency for each part?
The ADF4110BRUZ has a maximum phase detector frequency of 55 MHz. The ADF4156BRUZ has a maximum phase detector frequency of 32 MHz. These limits constrain the reference frequency and loop bandwidth that can be used in each design.
Do both devices support the same serial programming interface?
Both devices use a three-wire serial interface (CLK, DATA, LE) for register programming, but the register maps and bit definitions differ between the integer-N ADF4110 and the fractional-N ADF4156. Firmware written for one device cannot be reused unchanged for the other; the register sequences must be rewritten according to each datasheet.
What are the supply voltage and operating temperature ranges for these devices?
Both the ADF4110BRUZ and ADF4156BRUZ operate from a supply voltage of 2.7 V to 3.3 V and are specified over the industrial temperature range of -40 °C to +85 °C. These ratings should be confirmed against the latest official datasheets before final design release.
Which device is better suited for low phase noise and fine frequency resolution applications?
The ADF4156BRUZ, as a fractional-N synthesizer, provides finer frequency resolution for a given phase detector frequency and can achieve lower in-band phase noise in many designs because a higher reference frequency can be used. The ADF4110BRUZ, being integer-N, generally requires a lower comparison frequency to achieve fine channel spacing, which can increase phase noise and lock time. Selection should be validated against the specific phase noise and spurious requirements of the application.
Are evaluation boards or reference designs available for these parts?
Analog Devices provides evaluation boards and software for both the ADF4110 and ADF4156 families to support bench evaluation and register programming. Designers should obtain the current evaluation board documentation and software from the official Analog Devices website, as availability and revision levels may change.