Part A
ADF4371BCCZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7563 PCS
- Package
- LGA-48
- Series
- Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers
Replacement verdict
Compatible functional replacement candidate
The ADF4372BCCZ and ADF4371BCCZ share the same LFCSP-48 package, supply architecture, and PLL synthesizer core, making them strong functional replacement candidates. The ADF4372BCCZ extends the upper RF output frequency to 62.5 GHz versus 40 GHz on the ADF4371BCCZ, so the substitution is viable only when the application's maximum output frequency remains within the ADF4371BCCZ range and the additional frequency coverage is not required.
Package Type
High match
Supply Voltage
High match
Output Frequency Range
Validation required
Output Interface Type
High match
Parts at a glance
Part B
ADF4372BCCZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6331 PCS
- Package
- LGA-48
- 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 | ADF4372BCCZ | ADF4371BCCZ | Why it matters |
|---|---|---|---|
| Maximum Output Frequency | 62.5 GHz | 62.5 GHz | Both devices cover the same upper frequency limit, so neither offers an advantage for the highest-band applications. |
| Minimum Output Frequency | 800 MHz | 62.5 MHz | The ADF4371 extends much lower in frequency, making it usable in applications requiring low-band coverage that the ADF4372 cannot reach. |
| Integrated VCO | Yes | Yes | Both integrate a VCO, reducing external component count and simplifying loop filter and layout design. |
| Output Channels | Multiple (fundamental and divided outputs) | Multiple (fundamental and divided outputs) | Multiple outputs allow driving several downstream stages or bands from a single synthesizer, affecting system architecture flexibility. |
| Package Type | LFCSP (32-lead, 5 mm × 5 mm) | LFCSP (32-lead, 5 mm × 5 mm) | Identical package and footprint enable drop-in board-level substitution without PCB redesign. |
| Supply Voltage | 3.3 V (typical) | 3.3 V (typical) | Matching supply requirements means the same power rail design can support either part. |
| Interface | SPI (3-wire/4-wire) | SPI (3-wire/4-wire) | A common serial control interface allows reuse of the same microcontroller firmware and register map structure. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure equivalent environmental robustness for industrial and commercial deployments. |
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 | ADF4371BCCZ | ADF4372BCCZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Integer N Synthesizer (RF) | Integer N Synthesizer (RF) |
| PLL | Yes | Yes |
| Input | CMOS, ECL | CMOS, ECL |
| Output | Clock | Clock |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 1:5 | 1:4 |
| Differential - Input: Output | Yes/Yes | Yes/Yes |
| Frequency - Max | 32GHz | 16GHz |
| Divider / Multiplier | Yes/Yes | Yes/Yes |
| Voltage - Supply | 3.15V ~ 3.45V | 3.15V ~ 3.45V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADF4372BCCZ and ADF4371BCCZ?
Both are microwave wideband synthesizers with integrated VCOs from Analog Devices in a 48-lead LFCSP package. The ADF4372BCCZ covers an RF output range of 62.5 MHz to 32 GHz, while the ADF4371BCCZ covers 62.5 MHz to 32 GHz as well but with different output divider and doubler configurations. The ADF4372BCCZ integrates a frequency doubler and divide-by-2/4 stages optimized for the full 32 GHz range, whereas the ADF4371BCCZ provides similar coverage with slightly different phase noise and output power characteristics. Designers should consult the respective datasheets for exact phase noise, PLL figure of merit, and output power specifications before selecting between them.
Are the ADF4372BCCZ and ADF4371BCCZ pin-compatible?
Both devices are offered in the same 48-lead LFCSP (7 mm × 7 mm) package, and Analog Devices documents them as pin-compatible within the same family. However, because internal block configurations and register maps may differ, firmware and register settings must be validated against the specific datasheet before substituting one for the other on an existing PCB.
What is the output frequency range of each device?
The ADF4372BCCZ provides an RF output range of 62.5 MHz to 32 GHz. The ADF4371BCCZ also provides an RF output range of 62.5 MHz to 32 GHz. Both use an integrated VCO with fundamental output plus doubler and divider stages to cover the full range, but the exact divider/doubler architecture and resulting spurious and phase noise performance differ between the two parts.
Can the ADF4372BCCZ directly replace the ADF4371BCCZ in an existing design?
Direct replacement is not recommended without validation. Although both share the same package and broad frequency coverage, the register maps, output stage configurations, and performance specifications differ. The system firmware, loop filter design, and output matching network must be re-verified against the ADF4372BCCZ datasheet before substitution.
What are the typical applications for these synthesizers?
Both the ADF4372BCCZ and ADF4371BCCZ are intended for microwave point-to-point links, satellite communications, test and measurement equipment, radar systems, and high-frequency clock generation where wideband coverage up to 32 GHz with integrated VCO is required. Selection between them depends on the specific phase noise, output power, and spurious requirements of the application.
Do both devices support the same serial interface for programming?
Both devices use a SPI-compatible serial interface for register programming, consistent with the Analog Devices ADF437x family architecture. However, the specific register definitions and bit fields are device-specific, so firmware written for the ADF4371BCCZ cannot be assumed to operate the ADF4372BCCZ without modification and verification against its datasheet.
What supply voltages do the ADF4372BCCZ and ADF4371BCCZ require?
Both devices operate from a nominal 3.3 V supply for the analog and digital sections, with the integrated VCO and output stages using the same rail per the Analog Devices datasheets. Designers should confirm the exact supply rail tolerances, current consumption, and decoupling requirements in the respective datasheets, as these details may vary slightly between the two parts.