Part A
ADF4118BRUZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7756 PCS
- Package
- TSSOP-16
- Series
- Horloge Timing - générateur d'horloge, PLL, synthétiseur de fréquence
Replacement verdict
Compatible functional replacement candidate
The ADF4118BRUZ and ADF4110BRU 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 architecture, so they can serve as functional replacement candidates in many designs. However, the ADF4118BRUZ offers a higher maximum RF input frequency (3 GHz versus 550 MHz for the ADF4110BRU), so the replacement is only valid where the system RF range stays within the ADF4110BRU's lower frequency limit. Designers should confirm the required frequency range, reference input, and charge pump current settings before substituting.
Maximum RF Input Frequency
Validation required
Package Type
High match
Supply Voltage Range
High match
Charge Pump Current Range
Validation required
Parts at a glance
Part B
ADF4110BRU
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4814 PCS
- Package
- TSSOP-16
- Series
- Horloge Timing - générateur d'horloge, PLL, synthétiseur de fréquence
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 | ADF4110BRU | Why it matters |
|---|---|---|---|
| Maximum RF Input Frequency | 3 GHz | 550 MHz | Determines the highest frequency the PLL can lock to; the ADF4118 supports much higher frequency operation, so it is not a direct substitute in high-frequency designs. |
| Maximum PFD Frequency | 55 MHz | 55 MHz | The phase frequency detector rate affects phase noise and loop bandwidth; both parts share the same PFD limit, so loop filter design can be similar. |
| RF Input Sensitivity Range | -10 dBm to +5 dBm (typical) | -10 dBm to +5 dBm (typical) | Defines the input power window for reliable locking; matching sensitivity simplifies interchangeability of the front-end drive level. |
| Supply Voltage | 2.7 V to 3.3 V | 2.7 V to 3.3 V | Both operate from the same supply range, so power supply design and decoupling can be reused when swapping parts. |
| Supply Current | 7.5 mA typical | 4.5 mA typical | Affects power budget and thermal design; the ADF4110 draws less current, which may matter in low-power applications. |
| Package | 16-Lead TSSOP | 16-Lead TSSOP | Identical package and pinout allow drop-in board replacement without layout changes. |
| Programmable Charge Pump Current | 0.625 mA to 5 mA | 0.625 mA to 5 mA | Charge pump current sets loop gain and phase noise; matching ranges means the same loop filter tuning can be applied. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same industrial temperature range ensures both parts meet the same environmental requirements. |
| Reference Input Frequency | Up to 250 MHz | Up to 250 MHz | Reference input capability affects the achievable step size and phase noise; identical limits support similar reference chain design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADF4118BRUZ | ADF4110BRU |
|---|---|---|
| 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 | 550MHz |
| 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 the ADF4110BRU?
The ADF4118BRUZ and ADF4110BRU are both single-channel integer-N PLL frequency synthesizers from Analog Devices, but they differ in maximum RF input frequency and package. The ADF4118BRUZ operates up to 3.0 GHz and is supplied in a 16-lead TSSOP (RUZ suffix). The ADF4110BRU operates up to 550 MHz and is supplied in a 16-lead TSSOP (RU suffix). Both share the same functional architecture, including a programmable dual-modulus prescaler, programmable charge pump, and 3-wire serial interface.
Are the ADF4118BRUZ and ADF4110BRU pin-compatible?
Yes. Both devices are offered in the same 16-lead TSSOP package and share the same pinout, which includes the RF input, reference input, charge pump output, and serial interface pins. This common pinout allows the ADF4118BRUZ and ADF4110BRU to be used on the same PCB footprint, though the RF frequency range and loop filter design must be validated for the target application.
What is the maximum RF input frequency of each device?
The ADF4118BRUZ has a maximum RF input frequency of 3.0 GHz. The ADF4110BRU has a maximum RF input frequency of 550 MHz. These values are specified in the respective Analog Devices datasheets and determine the highest frequency the PLL can synthesize.
Do the ADF4118BRUZ and ADF4110BRU use the same supply voltage range?
Yes. Both devices operate from a single supply of 2.7 V to 3.3 V, as specified in the Analog Devices datasheets. The digital and analog supply pins (DVDD and AVDD) are separate to allow noise isolation, and both devices support a charge pump supply (VP) that can be tied to the same rail or a higher voltage within the specified limits.
Can the ADF4118BRUZ directly replace the ADF4110BRU in an existing design?
Because both parts share the same 16-lead TSSOP package and pinout, the ADF4118BRUZ can be placed on a board designed for the ADF4110BRU. However, a direct replacement requires verifying that the higher 3.0 GHz RF input range of the ADF4118BRUZ is compatible with the existing loop filter, VCO, and reference frequency plan, and that the register programming is validated against the ADF4118 datasheet. The ADF4110BRU cannot replace the ADF4118BRUZ in applications requiring frequencies above 550 MHz.
What is the difference in the programmable prescaler between the two devices?
Both the ADF4118BRUZ and ADF4110BRU include a programmable dual-modulus prescaler. The ADF4118BRUZ supports prescaler values of 8/9, 16/17, 32/33, and 64/65 to accommodate its 3.0 GHz input range. The ADF4110BRU supports prescaler values of 8/9, 16/17, 32/33, and 64/65 as well, but its lower 550 MHz maximum input frequency means the higher prescaler ratios are typically used for lower reference comparison frequencies. Designers should confirm the selected prescaler against the target phase detector frequency in the datasheet.
Do both devices support the same serial interface and register set?
Yes. Both the ADF4118BRUZ and ADF4110BRU use a 3-wire serial interface (CLK, DATA, LE) and contain the same set of programmable registers: the R counter, N counter (A and B counters), and the function/latch register. The register map and programming sequence are consistent across the ADF411x family, so firmware written for the ADF4110BRU can generally be reused for the ADF4118BRUZ after confirming the reference counter and prescaler settings for the higher frequency range.
What are the operating temperature ranges for the ADF4118BRUZ and ADF4110BRU?
Both devices are specified for operation over the industrial temperature range of −40°C to +85°C, as stated in the Analog Devices datasheets. The TSSOP package and the specified electrical characteristics apply across this range, and both parts are RoHS-compliant in their respective orderable part numbers.