Part A
ADF4156BRUZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4703 個数
- Package
- TSSOP-16
- Series
- クロックタイミング - クロックジェネレータ、PLL、周波数シンセサイザ
Replacement verdict
Compatible functional replacement candidate
The ADF4156BRUZ and ADF4116BRU are both fractional-N PLL frequency synthesizers from Analog Devices in the same 16-lead TSSOP package, sharing a common supply range and 3-wire serial interface, so the ADF4156BRUZ can serve as a functional replacement candidate for the ADF4116BRU in many designs. However, the two devices differ in maximum operating frequency, phase detector frequency, and fractional modulus, so the replacement must be validated against the target RF band and loop filter design before adoption.
Package Type
High match
Supply Voltage Range
High match
Maximum RF Input Frequency
Validation required
Fractional Modulus
Validation required
Parts at a glance
Part B
ADF4116BRU
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6377 個数
- Series
- クロックタイミング - クロックジェネレータ、PLL、周波数シンセサイザ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADF4156BRUZ | ADF4116BRU | Why it matters |
|---|---|---|---|
| Maximum RF Input Frequency | 6 GHz | 550 MHz | Determines the highest frequency the PLL can synthesize; the ADF4156 supports much higher frequency operation, so it is not a drop-in replacement for higher-band designs. |
| PLL Type / Architecture | Fractional-N | Integer-N | Fractional-N allows finer frequency resolution and lower phase noise for a given reference, while integer-N is simpler; this fundamentally changes loop design and achievable step size. |
| RF Input Frequency Range (min) | 500 MHz | 80 MHz | The lower frequency limit affects usability in low-band applications; the ADF4116 can operate at much lower RF input frequencies than the ADF4156. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 5.5 V | A wider supply range offers flexibility with 5 V systems; the ADF4116 tolerates higher supply voltages, which may matter in legacy or mixed-voltage designs. |
| Package | 16-Lead TSSOP | 16-Lead TSSOP | Package compatibility affects PCB footprint and assembly; both share the same TSSOP footprint, easing board-level substitution. |
| Normalized Phase Noise Floor | -216 dBc/Hz | -211 dBc/Hz | Lower phase noise floor yields cleaner synthesized signals; the ADF4156 offers better phase noise performance, important for high-performance RF systems. |
| Maximum PFD Frequency | 32 MHz | 55 MHz | The phase frequency detector rate influences loop bandwidth and in-band noise; the ADF4116 supports a higher PFD frequency, affecting loop filter design. |
| Charge Pump Current (programmable) | 0.3 mA to 5 mA | 0.625 mA to 5 mA | Charge pump current sets loop gain and affects lock time and stability; differing minimum currents change loop filter component selection. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same environmental conditions, so thermal constraints do not differentiate them. |
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 | ADF4116BRU |
|---|---|---|
| Part Status | Active | Obsolete |
| Digi Key Programmable | - | Not Verified |
| 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 |
| Base Product Number | - | ADF4116 |
Frequently asked questions
What are the key differences between the ADF4156BRUZ and the ADF4116BRU?
The ADF4156BRUZ is a fractional-N PLL frequency synthesizer with an integrated VCO, operating up to 6 GHz, while the ADF4116BRU is an integer-N PLL synthesizer without an integrated VCO, typically used up to 550 MHz. The ADF4156BRUZ supports fractional-N operation for finer frequency resolution, whereas the ADF4116BRU uses integer-N architecture.
Are the ADF4156BRUZ and ADF4116BRU pin-compatible?
No. The ADF4156BRUZ is supplied in a 20-lead TSSOP package, while the ADF4116BRU 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.
Can the ADF4156BRUZ directly replace the ADF4116BRU in an existing design?
No. Beyond package and pin count differences, the ADF4156BRUZ is a fractional-N synthesizer with an integrated VCO, while the ADF4116BRU is an integer-N synthesizer requiring an external VCO. The register maps, loop filter requirements, and RF architecture differ, so a direct replacement is not possible without redesign.
What is the maximum operating frequency of each device?
The ADF4156BRUZ operates up to 6 GHz. The ADF4116BRU operates up to 550 MHz. These figures should be confirmed against the latest official Analog Devices datasheets for the specific grade and operating conditions.
Do both devices use the same serial interface for programming?
Both devices use a 3-wire serial interface (CLK, DATA, LE) for register programming, but the register maps and bit definitions differ between the fractional-N ADF4156BRUZ and the integer-N ADF4116BRU. Firmware written for one device is not directly transferable to the other.
Which device is better suited for low phase noise applications?
The ADF4156BRUZ, with its fractional-N architecture and integrated VCO, is generally selected for applications requiring fine frequency resolution and low phase noise at higher frequencies. The ADF4116BRU, as an integer-N synthesizer, is suited to simpler lower-frequency designs. Final selection should be based on the phase noise specifications in the respective datasheets.
Are both parts RoHS compliant?
The ADF4156BRUZ suffix "Z" indicates a RoHS-compliant lead-free package per Analog Devices ordering conventions. RoHS status for the ADF4116BRU should be verified against the specific ordering code and the manufacturer's compliance documentation, as non-Z suffixes may indicate non-RoHS versions.