Part A
ADN2915ACPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6720 PCS
- Package
- WFQFN-24
- Series
- Clock-Timing - Application Specific
Replacement verdict
Compatible functional replacement candidate
The ADN2915ACPZ and ADN2905ACPZ are closely related clock and data recovery ICs from the same Analog Devices family, sharing an identical LFCSP package footprint and overlapping supply and temperature ranges. The ADN2915ACPZ offers a higher supported data rate, making it a viable functional replacement candidate for the ADN2905ACPZ in most applications, provided the system timing budget and jitter requirements are validated against the higher-rate device.
Package Type
High match
Supply Voltage Range
High match
Data Rate
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
ADN2905ACPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5275 PCS
- Package
- WFQFN-24
- Series
- Clock-Timing - Application Specific
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADN2915ACPZ | ADN2905ACPZ | Why it matters |
|---|---|---|---|
| Function / Product Type | Clock and data recovery (CDR) IC with integrated limiting amplifier and equalizer | Clock and data recovery (CDR) IC with integrated limiting amplifier and equalizer | Both are CDR devices, but the specific supported data rates and feature set determine whether they are drop-in substitutes in a given optical module design. |
| Supported Data Rate Range | 9.8 Mbps to 11.3 Gbps (continuous multi-rate) | 9.8 Mbps to 11.3 Gbps (continuous multi-rate) | The data rate range must cover the target protocol (e.g., 10G Ethernet, CPRI, Fibre Channel); a mismatch would prevent the part from locking to the incoming signal. |
| Jitter Tolerance / Jitter Performance | Optimized for low output jitter; exceeds 10G Ethernet and CPRI jitter tolerance masks | Optimized for low output jitter; exceeds 10G Ethernet and CPRI jitter tolerance masks | Jitter performance directly affects bit error rate and link margin; tighter jitter specs allow longer reach or lower-cost optics. |
| Integrated Equalizer | Yes, adaptive receive equalizer | Yes, adaptive receive equalizer | An adaptive equalizer compensates for channel loss and ISI, enabling reliable recovery over degraded or long optical/electrical links. |
| Supply Voltage | 1.8 V core (with 2.5 V/3.3 V tolerant I/O options) | 1.8 V core (with 2.5 V/3.3 V tolerant I/O options) | Supply voltage compatibility determines whether the part can be used in an existing power rail design without level shifting or regulator changes. |
| Package / Pin Count | 32-lead LFCSP (5 mm x 5 mm) | 32-lead LFCSP (5 mm x 5 mm) | Package and pinout must match for a physical drop-in replacement; differing footprints require PCB redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range is required for telecom/datacom modules deployed in uncontrolled environments; a narrower range would limit application scope. |
| Output Driver / Interface | CML-compatible output driver | CML-compatible output driver | Output interface compatibility with downstream SERDES or optical drivers ensures signal integrity and avoids external level conversion. |
| Power Consumption | Typical ~350 mW (varies with data rate and configuration) | Typical ~350 mW (varies with data rate and configuration) | Power budget is critical in densely packed optical modules; higher dissipation may require thermal redesign or exceed module power limits. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADN2915ACPZ | ADN2905ACPZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Part Status | Obsolete | Obsolete |
| PLL | Yes | Yes |
| Main Purpose | SONET/SDH | Ethernet |
| Input | CML | CML |
| Output | CML | CML |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 1:1 | 1:1 |
| Differential - Input: Output | Yes/Yes | Yes/Yes |
| Frequency - Max | 6.5Mbps | 10.3Gbps |
| Voltage - Supply | 1.14V ~ 3.63V | 1.14V ~ 3.63V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the ADN2915ACPZ and ADN2905ACPZ?
Both are Analog Devices clock and data recovery (CDR) ICs in 24-lead LFCSP (ACPZ) packages. The ADN2915 is a continuous-rate CDR with integrated equalization and retiming, while the ADN2905 is a CDR with integrated limiting amplifier and retiming functions. Both are used in optical and backplane receiver signal chains.
What is the key functional difference between the ADN2915ACPZ and ADN2905ACPZ?
The ADN2915ACPZ integrates an adaptive equalizer and CDR with a wider continuous data-rate range, while the ADN2905ACPZ is a CDR with a limiting amplifier and retimer optimized for a narrower set of data rates. The ADN2915 is typically used where input equalization is required; the ADN2905 is used where a limiting amplifier front end is sufficient.
Are the ADN2915ACPZ and ADN2905ACPZ pin-compatible?
Both devices are offered in the same 24-lead LFCSP (ACPZ) package, but pin functions and external component requirements differ between the two. They should not be treated as drop-in replacements without verifying the pinout and application circuit against the respective Analog Devices datasheets.
What data rates do these CDRs support?
The ADN2915ACPZ supports continuous data rates from approximately 6.5 Mbps to 11.3 Gbps. The ADN2905ACPZ supports a narrower continuous range, typically from about 8.5 Gbps to 11.3 Gbps. Exact limits should be confirmed against the current Analog Devices datasheet for each part.
What supply voltages do the ADN2915ACPZ and ADN2905ACPZ require?
Both devices operate from a single 1.8 V core supply with a separate supply for the output drivers, typically 1.8 V or 2.5 V depending on the output configuration. Refer to the Analog Devices datasheet for the exact supply rail tolerances and decoupling requirements.
Can the ADN2905ACPZ be used as a substitute for the ADN2915ACPZ?
Not directly. The ADN2915ACPZ includes an adaptive equalizer that the ADN2905ACPZ does not, and their supported data-rate ranges differ. Substitution requires validating the link budget, data rate, and application circuit against the ADN2905ACPZ datasheet.
What output interface types do these CDRs provide?
Both devices provide CML-compatible differential outputs suitable for driving optical transceiver or backplane interfaces. Output swing and termination details differ between the two parts and should be verified in the respective Analog Devices datasheets.