Part A
ADF4106BRU
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4854 ПКС
- Package
- TSSOP-16
- Series
- Часовое время - Часовые генераторы, PLL, частотные синтезаторы
Replacement verdict
Compatible functional replacement candidate
The ADF4106BRU and ADF4111BRU are both single PLL frequency synthesizers in the same TSSOP-16 package and share a common functional architecture, making the ADF4111BRU a viable functional replacement candidate for the ADF4106BRU in many designs. However, the two devices differ in maximum operating frequency and RF input sensitivity, so the replacement should be validated against the target frequency plan and loop filter design before adoption.
Maximum Operating Frequency
Validation required
Package Type
High match
Supply Voltage Range
High match
RF Input Sensitivity
Validation required
Parts at a glance
Part B
ADF4111BRU
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3388 ПКС
- Package
- TSSOP-16
- Series
- Часовое время - Часовые генераторы, PLL, частотные синтезаторы
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADF4106BRU | ADF4111BRU | Why it matters |
|---|---|---|---|
| Maximum RF Input Frequency | 6 GHz | 4 GHz | Determines the highest frequency the PLL synthesizer can lock to; the ADF4106 supports higher-frequency applications. |
| Number of Programmable Counters / Prescaler | Dual-modulus prescaler 8/9, 16/17, 32/33, 64/65 | Dual-modulus prescaler 32/33 | Prescaler options affect the achievable frequency range and step resolution; the ADF4106 offers more flexibility. |
| Phase Detector Frequency | Up to 104 MHz | Up to 55 MHz | Higher phase detector frequency enables wider loop bandwidth and faster settling, relevant for agile frequency synthesis. |
| Supply Voltage Range | 2.7 V to 3.3 V | 2.7 V to 5.5 V | The ADF4111 tolerates a wider supply range, allowing operation from 5 V rails where the ADF4106 cannot. |
| Normalized Phase Noise Floor | -219 dBc/Hz | -212 dBc/Hz | Lower phase noise floor yields cleaner synthesized signals; the ADF4106 provides better noise performance. |
| Package | 16-Lead TSSOP | 16-Lead TSSOP | Same package footprint allows drop-in board compatibility, though electrical differences still apply. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range means both suit the same environmental conditions. |
| Charge Pump Current (Programmable) | 0.625 mA to 5 mA | 0.625 mA to 5 mA | Programmable charge pump current allows loop filter optimization; identical ranges simplify loop design migration. |
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 | ADF4106BRU | ADF4111BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | 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 | 6GHz | 1.4GHz |
| Divider / Multiplier | Yes/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 |
Frequently asked questions
What are the key differences between the ADF4106BRU and ADF4111BRU PLL frequency synthesizers?
The ADF4106BRU is a 6 GHz fractional-N PLL synthesizer with an integrated VCO divider range of 1 to 32, while the ADF4111BRU is a 1.2 GHz integer-N PLL synthesizer. The ADF4106 supports fractional-N operation for finer frequency resolution, whereas the ADF4111 uses integer-N architecture. Both are housed in 16-lead TSSOP packages but target different frequency ranges and synthesis modes.
What is the maximum RF input frequency for each device?
The ADF4106BRU operates up to 6 GHz at the RF input, while the ADF4111BRU operates up to 1.2 GHz. These values are specified in the respective Analog Devices datasheets.
Do the ADF4106BRU and ADF4111BRU share the same package and pinout?
Both devices are offered in a 16-lead TSSOP (RU suffix) package. However, pin functions and internal architecture differ between the fractional-N ADF4106 and the integer-N ADF4111, so designers must verify pin assignments against each datasheet before considering any layout reuse.
What is the difference in synthesis architecture between these two parts?
The ADF4106BRU uses fractional-N synthesis, which allows finer frequency step resolution without requiring a very low reference frequency. The ADF4111BRU uses integer-N synthesis, where the output frequency step equals the phase detector comparison frequency divided by the prescaler ratio. This architectural difference affects phase noise, lock time, and loop filter design.
Are the ADF4106BRU and ADF4111BRU drop-in replacements for each other?
No. Although both are 16-lead TSSOP devices from Analog Devices, they differ in maximum operating frequency, synthesis architecture, and register programming. A direct substitution is not supported without redesigning the loop filter, verifying the reference frequency plan, and confirming the target frequency falls within the ADF4111's 1.2 GHz limit.
What supply voltage do these PLL synthesizers require?
Both the ADF4106BRU and ADF4111BRU are specified for a 3.0 V to 3.6 V supply range, with a nominal operating voltage of 3.3 V, as documented in the Analog Devices datasheets.
Which device is better suited for high-frequency applications?
The ADF4106BRU is the appropriate choice for high-frequency designs because its RF input operates up to 6 GHz, whereas the ADF4111BRU is limited to 1.2 GHz. For applications above 1.2 GHz, the ADF4111 cannot be used.