Part A
ADF4107BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7234 PCS
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
Replacement verdict
Compatible functional replacement candidate
The ADF4112BRU is a viable functional replacement candidate for the ADF4107BRUZ in many fractional-N PLL synthesizer applications, as both devices share the same TSSOP-16 footprint, 3 V to 3.6 V supply range, and 3-wire serial interface. However, the ADF4112BRU offers a lower maximum RF input frequency (3 GHz versus 7 GHz) and a lower maximum PFD frequency (55 MHz versus 104 MHz), so the replacement should be validated against the target loop bandwidth, phase noise, and lock-time requirements before adoption.
Package Type
High match
Supply Voltage Range
High match
Maximum RF Input Frequency
Validation required
Maximum PFD Frequency
Validation required
Parts at a glance
Part B
ADF4112BRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4577 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 | ADF4107BRUZ | ADF4112BRU | Why it matters |
|---|---|---|---|
| Maximum RF Input Frequency | 4 GHz | 3 GHz | Determines the highest frequency the PLL synthesizer can operate at; the ADF4107 supports higher-frequency VCOs and applications. |
| Number of Programmable Modulus Bits | 13-bit (dual-modulus) | 13-bit (dual-modulus) | Affects the achievable division ratio range and channel spacing flexibility in the feedback divider. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 3.3 V | Defines the operating voltage window; both parts are compatible with 3 V systems, easing power-supply design. |
| Package Type | 16-Lead TSSOP | 16-Lead TSSOP | Same footprint and pin count allow potential board-level interchangeability without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Confirms both parts are rated for industrial temperature environments, suitable for the same application conditions. |
| Charge Pump Current (Programmable) | Programmable (up to 5 mA) | Programmable (up to 5 mA) | Charge pump current influences loop filter design and lock time; matching ranges simplify loop filter reuse. |
| Reference Input Frequency | Up to 250 MHz | Up to 250 MHz | Sets the maximum reference clock the PLL can accept, affecting phase detector rate and phase noise performance. |
| Prescaler | Dual-modulus 8/9, 16/17, 32/33, 64/65 | Dual-modulus 8/9, 16/17, 32/33, 64/65 | Prescaler options determine the division range and maximum operating frequency of the feedback counter. |
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 | ADF4107BRUZ | ADF4112BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Clock/Frequency 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 | 7GHz | 3GHz |
| Divider / Multiplier | No/No | 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 | ADF4107 | - |
| Digi Key Programmable | Not Verified | - |
| Packaging | Tube | - |
Frequently asked questions
What are the key differences between the ADF4107BRUZ and ADF4112BRU?
The ADF4107BRUZ is a 7 GHz fractional-N PLL frequency synthesizer with an integrated VCO, while the ADF4112BRU is a 3 GHz integer-N PLL synthesizer without an integrated VCO. The ADF4107BRUZ supports fractional-N operation for finer frequency resolution, whereas the ADF4112BRU uses integer-N architecture requiring a lower reference comparison frequency for fine steps.
Are the ADF4107BRUZ and ADF4112BRU pin-compatible?
No. The ADF4107BRUZ is supplied in a 20-lead TSSOP (RU-20) package, while the ADF4112BRU is supplied in a 16-lead TSSOP (RU-16) package. The different pin counts and pin functions prevent direct pin-to-pin substitution on the same PCB land pattern.
What is the maximum RF input frequency for each device?
The ADF4107BRUZ has a maximum RF input frequency of 7 GHz. The ADF4112BRU has a maximum RF input frequency of 3 GHz. Designs requiring operation above 3 GHz must use the ADF4107BRUZ or another device rated for the target frequency.
Do both devices require an external VCO and loop filter?
No. The ADF4107BRUZ includes an integrated VCO, reducing external component count, though an external loop filter is still required. The ADF4112BRU does not include an integrated VCO and requires an external VCO plus loop filter to complete the synthesizer loop.
What are the supply voltage requirements for the ADF4107BRUZ and ADF4112BRU?
Both devices operate from a nominal 3.0 V to 3.6 V supply for the digital and charge pump sections, with the ADF4107BRUZ VCO section also operating within this range. Designs should verify the exact supply limits and decoupling requirements in the respective manufacturer datasheets before layout.
Which device offers finer frequency resolution?
The ADF4107BRUZ offers finer frequency resolution because its fractional-N architecture allows frequency steps smaller than the phase detector comparison frequency. The ADF4112BRU, being integer-N, produces output steps equal to the phase detector comparison frequency, requiring a lower comparison frequency for fine steps.
Can the ADF4112BRU be used as a drop-in replacement for the ADF4107BRUZ?
No. The ADF4112BRU is not a drop-in replacement for the ADF4107BRUZ due to differences in package pin count, maximum RF frequency (3 GHz versus 7 GHz), and PLL architecture (integer-N versus fractional-N). Any substitution requires schematic, layout, and loop filter redesign plus validation against the target specifications.