ADF4112BCP - 3 GHz Integer-N PLL | Analog Devices
MPN: ADF4112BCP ✓ ActiveADF4112BCP Overview
Drop-in alternatives for ADF4112BCP — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADF4112BCP (same form factor and footprint) — differing in Package, A Counter, B Counter, Prescaler, Power Supply.
ADF4113BCP
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →ADF4112BCPZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADF4106BCPZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADF4112BCP Specifications
| Device Type | Single, integer-N RF PLL frequency synthesizer |
| Maximum Operating Frequency | 3.0 GHz |
| Input Frequency Range | 5 MHz to 3.0 GHz |
| Prescaler | Programmable dual-modulus P/P+1 prescaler |
| Phase-Frequency Detector | Low-noise digital PFD |
| Charge Pump | Precision charge pump with programmable currents |
| Charge-Pump Supply | Separate VP supply |
| Reference Divider | Programmable |
| A Counter | 6-bit programmable |
| B Counter | 13-bit programmable |
| Power Supply | 5.5 V |
| Supported System Voltage | 3 V systems |
| Package | 20-pin LFCSP with exposed pad |
| Mounting Type | Surface mount |
ADF4112BCP 20-pin lfcsp with exposed pad Pin Configuration Guide
Pin configuration for ADF4112BCP (20-pin lfcsp with exposed pad package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ADF4112BCP.
Refer to the datasheet for full pin configuration.
Typical Applications
ADF4112BCP is suitable for 6 applications: Wireless Receiver Local Oscillator, Wireless Transmitter Upconversion, Instrumentation RF Signal Source, RF Frequency Converter, Communications Module, Industrial RF Control System.
Wireless Receiver Local Oscillator
ADF4112BCP fits a wireless receiver local oscillator because it synthesizes integer-N frequencies for RF downconversion and supports input signals from 5 MHz to 3.0 GHz. Its 6-bit A counter, 13-bit B counter, programmable reference divider, and programmable dual-modulus prescaler provide the frequency-planning elements needed to derive a coherent receiver LO. The low-noise digital phase-frequency detector and precision charge pump can support a suitably designed loop filter, although phase noise depends on reference quality, divider settings, and loop bandwidth. In a practical implementation, the reference enters the divider chain, the phase detector compares divided signals, and the charge pump drives the RF tuning voltage. The 20-pin LFCSP requires careful grounding of its exposed pad and short, impedance-conscious routing between the synthesizer, loop filter, and VCO.
Recommended
Wireless Transmitter Upconversion
ADF4112BCP can generate the integer-N local-oscillator signal used by wireless transmitter upconversion stages operating within its 3.0 GHz maximum frequency. The programmable prescaler, counters, reference divider, and charge-pump current settings let the designer tailor channel spacing and divider ratios, while the separate VP supply permits an extended tuning-voltage range when the RF VCO requires it. The synthesizer should be paired with a phase-noise- and current-consumption-matched VCO, and the loop filter must be calculated from the selected prescaler, charge-pump current, reference rate, and required lock time. Keep the RF output path and charge-pump loop filter physically separated to prevent modulation of the LO, and use a continuous ground reference beneath the exposed pad.
Recommended
Instrumentation RF Signal Source
ADF4112BCP is suitable for compact RF signal-source and test-instrumentation architectures that need programmable integer-N frequency generation up to 3.0 GHz. The reference divider and dual-modulus prescaler support flexible divisor planning, while the 6-bit A and 13-bit B counters provide channel and coarse-tuning resolution. In an instrument, the PLL output can feed a VCO or frequency-conversion stage, with serial programming controlling the selected channel. The 3.0 GHz upper limit should be checked against the highest requested intermediate frequency, harmonic, or translated output because external multiplication can amplify phase noise. Stable reference routing and a carefully calculated low-pass loop filter are essential for repeatable settling and spectral performance.
Recommended
RF Frequency Converter
ADF4112BCP can supply the coherent local oscillator used by an RF downconverter or upconverter because its integer-N architecture closes a phase-locked loop between a stable reference and an RF VCO. The programmable dual-modulus prescaler is useful for translating common reference rates into practical channel divisions, while the low-noise digital phase-frequency detector supports close phase comparison. A practical converter places the ADF4112BCP beside the VCO and loop filter, with the CP and VTUNE connections kept short and the RF output routed away from sensitive digital and reference nodes. Separate VP support is valuable when the VCO tuning range exceeds the logic-side voltage range, but the maximum VP, current, and leakage limits must be verified from the manufacturer datasheet before implementation.
Recommended
Communications Module
ADF4112BCP can support programmable RF channels in communications modules that implement local-oscillator generation within the 5 MHz to 3.0 GHz range. The device combines programmable frequency division with a precision charge pump, allowing channel spacing and lock behavior to be established through counter values, prescaler selection, and the external loop filter. For embedded radio modules, its compact 20-pin LFCSP construction helps preserve board area, although the exposed pad requires adequate thermal copper and a low-impedance return path. Designers should budget the reference oscillator's frequency tolerance and phase noise into the end-to-end frequency accuracy and adjacent-channel performance. Firmware must also account for the valid prescaler, counter, and charge-pump register combinations specified by Analog Devices.
Recommended
Industrial RF Control System
ADF4112BCP can serve as the frequency-control element in an industrial RF system requiring a programmable 5 MHz to 3.0 GHz source. Integer-N division provides a direct method for deriving stable excitation or conversion frequencies from a shared reference, while the separate charge-pump supply gives additional control over the tuning range of an external VCO. The device is most useful when predictable integer channel spacing and established family programming are more important than fractional-N flexibility. In a factory-oriented product, thermal performance, reference startup time, lock behavior, and fault recovery should be validated across temperature and supply ranges. Short VTUNE traces, a compact passive loop filter, solid ground-plane continuity, and adequate exposed-pad copper improve repeatability without changing the synthesizer architecture.
Recommended
Recommended Products Summary
Engineering reference data for ADF4112BCP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADF4113BCP | ADF4112BCPZ | ADF4106BCPZ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-pin LFCSP with exposed pad | 20-pin LFCSP with exposed pad | 20-pin LFCSP with exposed pad | 20-pin LFCSP with exposed pad |
| Synthesis Architecture | Integer-N | Integer-N | Integer-N | Integer-N |
Key Differentiators
- Purpose-matched 3.0 GHz integer-N operating point (vs ADF4157BCPZ)
- Lower family frequency ceiling than the 4.0 GHz member (vs ADF4113BCP)
- Same-family programming architecture and exposed-pad format (vs ADF4112BCPZ)
Design Notes
Use the manufacturer's 20-pin LFCSP land pattern and connect the exposed pad to the designated ground plane with minimal via inductance. Place the loop-filter components close to the charge-pump and VTUNE connections, while keeping the sensitive reference input and digital programming lines away from the RF output path. The exposed pad improves heat transfer, but copper area must not compromise the recommended pad geometry. Verify the final PCB against Analog Devices Data Sheet Rev. F rather than relying on a generic QFN footprint.
Decouple the 5.5 V supply locally and treat the separate VP charge-pump rail as a distinct analog tuning-domain supply. Check VP against the maximum voltage and current stated in Data Sheet Rev. F, and account for charge-pump leakage when sizing the VTUNE network. A common mistake is to assume that the logic supply and charge-pump supply have identical limits. Validate startup, lock, and shutdown behavior across the intended supply range, particularly if VP can remain energized while the main supply is off.
Do not select a PLL by maximum frequency alone; the prescaler, reference divider, A and B counters, charge-pump current, and loop-filter component values must produce legal N values and meet phase-noise and lock-time targets. The 3.0 GHz figure is the verified maximum operating frequency, while the minimum input frequency is 5 MHz. Confirm the intended architecture is integer-N; ADF4157BCPZ is a 6.2 GHz fractional-N device and should not be treated as a transparent replacement without a complete register and pinout review.
Estimate total dissipation from the charge pump and internal digital circuitry using the actual supply, output-divider, and register settings, then compare the resulting junction-temperature estimate with the device limits. The exposed pad is the primary thermal path, so thermal performance depends on both solder-joint quality and board copper. Keep the analog ground return compact and avoid creating a high-resistance path between the exposed pad, bypass capacitors, and the charge-pump filter. No specific thermal resistance was supplied in the verified data, so a numerical junction-temperature claim would be unsupported.
Compliance Information
The supplied verified data does not state the target's RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is marked not applicable because this is a clock and timing IC rather than an automotive-qualified device designation in the provided data.
