Part A
ADN2812ACPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6938 PCS
- Package
- WFQFN-32
- Series
- Horário - Específico do Programa
Replacement verdict
Compatible functional replacement candidate
The ADN2812ACPZ and ADN2811ACPZ-CML-RL are both single-channel clock and data recovery ICs from the same Analog Devices ADN281x family, sharing a 5 mm × 5 mm 32-lead LFCSP footprint and a 3.3 V supply. They are functionally aligned for many SONET/SDH and 10 Gigabit Ethernet receive-path designs, but the ADN2812ACPZ offers a wider continuous data-rate range and a CML output interface, whereas the ADN2811ACPZ-CML-RL is a fixed-rate variant. Designers should validate the specific data rate, output interface compatibility, and configuration pin strapping against the target application before committing to a drop-in substitution.
Data Rate Range
High match
Output Interface
Validation required
Package and Footprint
High match
Supply Voltage
Validation required
Parts at a glance
Part B
ADN2811ACPZ-CML-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8492 PCS
- Package
- WFQFN-48
- Series
- Horário - Específico do Programa
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADN2812ACPZ | ADN2811ACPZ-CML-RL | Why it matters |
|---|---|---|---|
| Data Rate Range | 12.3 Mbps to 2.7 Gbps | Up to 2.7 Gbps | Defines the range of serial data rates the CDR can lock to; a wider specified lower bound affects usability in low-rate applications. |
| Output Interface Type | CML (current-mode logic) | CML (current-mode logic) | Determines the electrical interface to the downstream SERDES/ASIC; matching output type ensures direct compatibility. |
| Jitter Tolerance | Exceeds ITU-T G.825 and Telcordia GR-253-CORE | Exceeds ITU-T G.825 and Telcordia GR-253-CORE | Jitter tolerance determines robustness in noisy optical links; both meeting the same standards supports substitutability. |
| Supply Voltage | 3.3 V | 3.3 V | Supply voltage must match the board rail; identical 3.3 V operation allows drop-in replacement without power redesign. |
| Package | 32-lead LFCSP (5 mm x 5 mm) | 32-lead LFCSP (5 mm x 5 mm) | Package and footprint must match for physical board compatibility; identical LFCSP allows the same PCB land pattern. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range affects deployment in harsh environments; matching ranges ensures equivalent thermal suitability. |
| Lock Detect / Loss of Lock Indicator | Yes (LOL pin) | Yes (LOL pin) | Lock detection is used by system firmware for link status; both providing LOL supports equivalent system behavior. |
| Reference Clock Input | Supported (external REFCLK) | Supported (external REFCLK) | Reference clock input enables holdover and lock stability; both supporting REFCLK preserves system timing architecture. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADN2812ACPZ | ADN2811ACPZ-CML-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| PLL | Yes | Yes |
| Main Purpose | SONET/SDH | SONET/SDH, STM |
| Input | CML | CML |
| Output | CML | CML |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 1:2 | 1:2 |
| Differential - Input: Output | Yes/Yes | Yes/Yes |
| Frequency - Max | 2.7GHz | 2.66GHz |
| Voltage - Supply | 3V ~ 3.6V | 3V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the ADN2812ACPZ and ADN2811ACPZ-CML-RL?
Both are Analog Devices clock and data recovery (CDR) ICs for optical receiver applications. The ADN2812ACPZ is a continuous-rate CDR with an integrated limiting amplifier, while the ADN2811ACPZ-CML-RL is a fixed-rate CDR with CML outputs supplied in tape-and-reel packaging.
What is the key functional difference between the ADN2812ACPZ and ADN2811ACPZ-CML-RL?
The ADN2812ACPZ supports continuous-rate operation across its specified data-rate range, allowing it to lock to any rate within that range. The ADN2811ACPZ-CML-RL is a fixed-rate device configured for a specific data rate, so it is not rate-agile across a continuous range.
Do the ADN2812ACPZ and ADN2811ACPZ-CML-RL use the same package and pinout?
Both devices are offered in a 32-lead LFCSP package, but the ADN2812ACPZ and ADN2811ACPZ-CML-RL are distinct part numbers with device-specific pin functions and configuration. A direct drop-in substitution should not be assumed without comparing the respective datasheet pin descriptions and application circuits.
What output interface does the ADN2811ACPZ-CML-RL provide?
The ADN2811ACPZ-CML-RL provides CML (current-mode logic) output drivers, as indicated by the CML suffix in the part number. CML outputs are intended for high-speed differential signaling to downstream SerDes or optical module circuitry.
Can the ADN2812ACPZ and ADN2811ACPZ-CML-RL be used interchangeably in an existing design?
No. Because one is a continuous-rate CDR and the other is a fixed-rate CDR, and because their configuration and output characteristics differ, they are not interchangeable without design validation. The target data rate, output interface, and loop filter requirements must be verified against the specific device datasheet before any substitution.
What does the -RL suffix on ADN2811ACPZ-CML-RL indicate?
The -RL suffix denotes tape-and-reel packaging for automated assembly. It does not change the electrical function of the device; the ADN2811ACPZ-CML-RL is the same CDR die supplied in reel format for production pick-and-place lines.
Are the ADN2812ACPZ and ADN2811ACPZ-CML-RL RoHS compliant?
Both part numbers carry the ACPZ suffix, which in Analog Devices nomenclature denotes a lead-free, RoHS-compliant LFCSP package. Designers should confirm the current compliance status on the official Analog Devices product page or an authorized distributor listing before finalizing a bill of materials.
Which device should be selected for a multi-rate optical receiver design?
For a multi-rate receiver that must lock to a range of data rates, the ADN2812ACPZ continuous-rate CDR is the appropriate choice. For a fixed-rate link where the data rate is known and fixed, the ADN2811ACPZ-CML-RL fixed-rate CDR is suitable. Selection should be confirmed against the datasheet's specified operating range and the system's jitter and output interface requirements.