Part A
ADN2812ACPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6938 PCS
- Package
- WFQFN-32
- Series
- Clock-Timing - Application Specific
Replacement verdict
Compatible functional replacement candidate
The ADN2812ACPZ and ADN2819ACP-CML are both clock and data recovery ICs from Analog Devices, but they are not drop-in replacements. The ADN2819ACP-CML offers a wider data rate range and a CML output interface, while the ADN2812ACPZ provides a different output type and package. Designers should validate output interface compatibility, data rate requirements, and board layout before substituting one for the other.
Output Type
Validation required
Data Rate Range
Validation required
Package Type
Validation required
Supply Voltage
Validation required
Parts at a glance
Part B
ADN2819ACP-CML
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5086 PCS
- Package
- WFQFN-48
- 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 | ADN2812ACPZ | ADN2819ACP-CML | Why it matters |
|---|---|---|---|
| Function | Continuous rate clock and data recovery IC | Multirate clock and data recovery IC with integrated limiting amplifier | Defines the core role of the device; the ADN2819 includes an integrated limiting amplifier while the ADN2812 does not, affecting whether external signal conditioning is required. |
| Data Rate Range | 12.3 Mb/s to 2.7 Gb/s | 12.3 Mb/s to 2.7 Gb/s (multirate) | Determines the range of serial data rates the CDR can lock to; both cover similar spans but the ADN2819 is specified as multirate with automatic rate detection. |
| Integrated Limiting Amplifier | No | Yes | An integrated limiting amplifier reduces external component count and board space; its absence in the ADN2812 means an external amplifier may be needed for low-amplitude inputs. |
| Output Type | CML-compatible differential outputs | CML differential outputs | Output signaling must match the downstream SERDES or logic interface; both provide CML, but the exact output configuration differs between the parts. |
| Package | 32-lead LFCSP (5 mm x 5 mm) | 48-lead LFCSP | Package footprint and pin count affect PCB layout and drop-in substitutability; the two parts are not footprint-compatible. |
| Supply Voltage | 3.3 V | 3.3 V | Supply voltage must match the system rail; both operate from a 3.3 V supply, simplifying power design. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range ensures reliable operation in harsh environments; both parts share the same range. |
| Jitter Performance | Low jitter, typical sub-ps RMS | Low jitter, typical sub-ps RMS | Jitter directly impacts bit error rate; both are specified for low jitter suitable for high-speed serial links. |
| Lock Detect / Rate Detection | Automatic rate detection with lock detect output | Automatic rate detection with lock detect output | Lock detection signals link status to the host; both provide this feature, aiding system diagnostics and control. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADN2812ACPZ | ADN2819ACP-CML |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| PLL | Yes | Yes |
| Main Purpose | SONET/SDH | SONET/SDH, STM |
| Input | CML | CML |
| Output | CML | CML |
| Ratio - Input: Output | 1:2 | 1:2 |
| Differential - Input: Output | Yes/Yes | Yes/Yes |
| Frequency - Max | 2.7GHz | 2.7GHz |
| Voltage - Supply | 3V ~ 3.6V | 3V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Circuits | 1 | - |
Frequently asked questions
What are the primary functional differences between the ADN2812ACPZ and the ADN2819ACP-CML?
The ADN2812ACPZ is a continuous-rate clock and data recovery (CDR) IC with an integrated limiting amplifier, supporting data rates from 12.3 Mb/s to 2.7 Gb/s. The ADN2819ACP-CML is a multirate CDR with an integrated limiting amplifier and a CML output driver, supporting a set of specific SONET/SDH and Fibre Channel rates (including 155.52 Mb/s, 622.08 Mb/s, 1.25 Gb/s, 2.488 Gb/s, and 2.5 Gb/s). The ADN2812 offers continuous rate coverage, while the ADN2819 targets discrete standardized rates with CML outputs.
Are the ADN2812ACPZ and ADN2819ACP-CML pin-compatible?
No. Both devices are offered in a 32-lead LFCSP package, but their pin functions and control interfaces differ. The ADN2819ACP-CML includes rate-select and CML output pins that are not present on the ADN2812ACPZ. A direct drop-in replacement is not supported; the PCB layout and control interface must be validated against each device's datasheet.
What output interface does each device provide?
The ADN2812ACPZ provides a CML-compatible data and clock output pair. The ADN2819ACP-CML provides CML outputs with an integrated output driver optimized for driving 50 Ω transmission lines. In both cases, AC coupling and proper termination per the datasheet are required.
What data rate ranges do these CDRs support?
The ADN2812ACPZ supports continuous data rates from 12.3 Mb/s to 2.7 Gb/s. The ADN2819ACP-CML supports a discrete set of rates covering SONET/SDH OC-3/OC-12/OC-48 and Fibre Channel 1x/2x rates, up to 2.5 Gb/s. Designs requiring arbitrary or continuous rates should use the ADN2812; designs locked to standardized rates can use the ADN2819.
Do both devices include an integrated limiting amplifier?
Yes. Both the ADN2812ACPZ and the ADN2819ACP-CML integrate a limiting amplifier on the input path, allowing direct connection to optical receiver front-ends such as transimpedance amplifiers (TIAs) without an external limiting amplifier stage.
What are the supply voltage and power considerations for these devices?
Both devices operate from a 3.3 V supply. Actual power consumption differs between the two parts and depends on the configured data rate and output loading. Designers should refer to the respective datasheet's power supply and thermal specifications for exact current and power figures rather than assuming interchangeability.
Which device should be selected for a 2.488 Gb/s SONET/SDH application?
Both devices support 2.488 Gb/s operation. The ADN2819ACP-CML is specifically designed around standardized SONET/SDH rates and includes rate selection for OC-48, making it a natural fit. The ADN2812ACPZ also covers 2.488 Gb/s within its continuous range and may be preferred when the same board must support multiple non-standard rates.
Can the ADN2812ACPZ and ADN2819ACP-CML be used interchangeably in an existing design?
No. Despite similar functionality, differences in rate coverage, control interface, output driver configuration, and pin functions prevent direct interchange. Any substitution requires schematic, layout, and firmware validation against the target device's datasheet and confirmed availability from authorized distributors.