Part A
ADF4118BRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7756 PCS
- Package
- TSSOP-16
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
Replacement verdict
Compatible functional replacement candidate
The ADF4118BRUZ and ADF4111BRU are both single-channel integer-N PLL frequency synthesizers from Analog Devices in the same 16-lead TSSOP package, sharing a common pinout and 3 V supply range, so they can serve as functional replacement candidates in many designs. However, the ADF4118BRUZ offers a higher maximum RF input frequency and a wider programmable reference divider range than the ADF4111BRU, so the system RF band, loop filter design, and reference frequency plan must be validated before substitution.
Package Type
High match
Supply Voltage Range
High match
Maximum RF Input Frequency
Validation required
Reference Divider Range
Validation required
Parts at a glance
Part B
ADF4111BRU
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3388 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 | ADF4118BRUZ | ADF4111BRU | Why it matters |
|---|---|---|---|
| Maximum Operating Frequency | 3 GHz | 1.2 GHz | Determines the highest RF input frequency the PLL synthesizer can lock to; a higher limit enables use in higher-band applications. |
| Number of Programmable Modulus Prescaler | 8/9, 16/17, 32/33, 64/65 | 8/9, 16/17, 32/33 | Affects the achievable frequency resolution and loop dynamics; more prescaler options give greater flexibility in choosing reference and feedback divider ratios. |
| RF Input Sensitivity Range | -10 dBm to +5 dBm (typical) | -10 dBm to +5 dBm (typical) | Defines the input power window over which the prescaler and counters operate reliably; matching this to the VCO output level is essential for stable locking. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 3.3 V | Must match the system power rail; both parts share the same range, allowing drop-in compatibility in 3 V designs. |
| Package / Pin Count | 16-Lead TSSOP | 16-Lead TSSOP | Identical footprint and pinout enable direct board-level substitution 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, supporting use in the same application conditions. |
| Charge Pump Current (Programmable) | 0.625 mA to 5 mA | 0.625 mA to 5 mA | Sets loop filter design and phase noise/loop bandwidth trade-offs; matching ranges allow reuse of the same loop filter topology. |
| Phase Detector Frequency | Up to 55 MHz | Up to 55 MHz | Determines the reference comparison rate and achievable phase noise; identical limits mean comparable noise performance for a given reference. |
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 | ADF4118BRUZ | ADF4111BRU |
|---|---|---|
| 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 | 3GHz | 1.4GHz |
| Divider / Multiplier | Yes/No | Yes/No |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| 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 ADF4118BRUZ and ADF4111BRU?
The ADF4118BRUZ and ADF4111BRU are both single PLL frequency synthesizers from Analog Devices, but they differ in maximum operating frequency and package. The ADF4118BRUZ operates up to 3.0 GHz and is supplied in a 16-lead TSSOP (RUZ suffix). The ADF4111BRU operates up to 1.2 GHz and is supplied in a 16-lead TSSOP (RU suffix). Both integrate a low-noise digital phase frequency detector, a precision charge pump, a programmable reference divider, and programmable dual-modulus prescalers.
Are the ADF4118BRUZ and ADF4111BRU pin-compatible?
Both devices are offered in the same 16-lead TSSOP package, and their pin functions follow the same family pinout (clock, data, LE, CE, charge pump output, reference input, RF inputs, and supply/ground pins). However, designers should confirm pin assignments against the respective Analog Devices datasheets before treating them as drop-in replacements, since the maximum RF input frequency rating differs between the two parts.
What is the maximum RF input frequency of each device?
Per Analog Devices datasheets, the ADF4118BRUZ has a maximum RF input frequency of 3.0 GHz, while the ADF4111BRU has a maximum RF input frequency of 1.2 GHz. The ADF4118BRUZ is therefore suited to higher-frequency local oscillator designs, whereas the ADF4111BRU targets lower-frequency applications.
Do both parts use the same supply voltage range?
Yes. Both the ADF4118BRUZ and ADF4111BRU are specified for a 2.7 V to 3.3 V supply range, consistent with the Analog Devices ADF411x family. The charge pump supply (Vp) can be set independently to support a wider tuning voltage range for the VCO.
Can the ADF4118BRUZ directly replace the ADF4111BRU in an existing design?
Not automatically. Although both are 16-lead TSSOP PLL synthesizers with a similar register and pinout structure, the ADF4118BRUZ supports RF input up to 3.0 GHz versus 1.2 GHz for the ADF4111BRU. A replacement is only valid after verifying that the higher frequency rating, charge pump settings, prescaler configuration, and loop filter design meet the target application requirements against the Analog Devices datasheets.
What charge pump current is available on these devices?
Both the ADF4118BRUZ and ADF4111BRU feature a programmable charge pump. According to Analog Devices documentation, the charge pump output current is programmable via the register settings, allowing the loop filter and loop dynamics to be optimized for the application. Designers should refer to the specific datasheet register map for the exact programmable current settings.
What package and operating temperature range do these parts use?
Both the ADF4118BRUZ and ADF4111BRU are offered in a 16-lead TSSOP package. The ADF4118BRUZ uses the RUZ suffix and the ADF4111BRU uses the RU suffix. Both are specified for the industrial temperature range of −40 °C to +85 °C per Analog Devices datasheets.
Which device should be selected for a 2.4 GHz application?
The ADF4118BRUZ should be selected, because its maximum RF input frequency of 3.0 GHz covers a 2.4 GHz design, whereas the ADF4111BRU is rated only to 1.2 GHz and would not be suitable for that frequency. Final selection should also account for prescaler ratio, charge pump current, and loop filter requirements documented in the Analog Devices datasheet.