Part A
ADN2850BCPZ250
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7397 PCS
- Package
- LFCSP-16
- Series
- Data Acquisition - Digital Potentiometers
Replacement verdict
Not a drop-in replacement
The ADN2850BCPZ250 and ADN2811ACPZ-CML serve fundamentally different functions and cannot be treated as interchangeable. The ADN2850BCPZ250 is a dual-channel digital potentiometer, while the ADN2811ACPZ-CML is a clock and data recovery IC, so their electrical roles, signal interfaces, and application domains do not overlap. Substitution is not feasible without a complete redesign of the surrounding circuit.
Different device function
Different signal interface
Different package and pinout
Different application domain
Parts at a glance
Part B
ADN2811ACPZ-CML
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4704 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 | ADN2850BCPZ250 | ADN2811ACPZ-CML | Why it matters |
|---|---|---|---|
| Function / Product Type | Nonvolatile digital potentiometer (dual-channel, 250 kΩ) | Clock and data recovery (CDR) IC with limiting amplifier | These are fundamentally different device classes, so they are not functionally substitutable in any design. |
| Primary Signal Domain | Analog resistive (potentiometer wiper) | High-speed serial digital (CML data/clock) | The signal type each device processes determines whether it can interface with a given circuit at all. |
| Package | 20-lead LFCSP (CP-20) | 32-lead LFCSP (CP-32) | Different footprint and pin count prevent drop-in board replacement. |
| Supply Voltage | 2.7 V to 5.5 V (single supply) | 3.3 V nominal (3.0 V to 3.6 V) | Supply compatibility is required for the device to operate within the target system's power rails. |
| Interface / Control | SPI-compatible serial interface | CML differential data/clock I/O with I2C control | The host must speak the correct protocol to configure and use the device. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial range, so thermal environment is not a differentiator here. |
| Data Rate / Bandwidth | Not applicable (resistive device, no data rate) | Up to 2.7 Gbps serial data rate | The CDR's data rate capability defines which serial standards it can support, while the potentiometer has no such spec. |
| Nonvolatile Memory | Yes (EEPROM wiper setting retention) | No | Nonvolatile wiper storage lets the potentiometer retain its setting across power cycles, a function the CDR does not provide. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADN2850BCPZ250 | ADN2811ACPZ-CML |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| PLL | - | Yes |
| Main Purpose | - | SONET/SDH, STM |
| Input | - | CML |
| Output | - | CML |
| Number of Circuits | - | 1 |
| Ratio - Input: Output | - | 1:2 |
| Differential - Input: Output | - | Yes/Yes |
| Frequency - Max | - | 2.66GHz |
| Voltage - Supply | - | 3V ~ 3.6V |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
Are the ADN2850BCPZ250 and ADN2811ACPZ-CML functionally interchangeable?
No. The ADN2850BCPZ250 is a dual-channel, 250 kΩ nonvolatile digital potentiometer, while the ADN2811ACPZ-CML is a clock and data recovery (CDR) IC for OC-48/STM-16 SONET/SDH applications. They serve entirely different functions and are not interchangeable.
What are the primary functions of the ADN2850BCPZ250 and ADN2811ACPZ-CML?
The ADN2850BCPZ250 provides digitally controlled resistance for applications such as gain adjustment, offset trimming, and calibration. The ADN2811ACPZ-CML recovers clock and data signals from serial NRZ data streams in optical networking equipment.
What package types do the ADN2850BCPZ250 and ADN2811ACPZ-CML use?
Both devices are supplied in LFCSP packages. The ADN2850BCPZ250 is offered in a 5 mm × 5 mm 32-lead LFCSP, and the ADN2811ACPZ-CML is offered in a 7 mm × 7 mm 48-lead LFCSP. Package dimensions and pin counts differ, so PCB footprints are not compatible.
What are the key supply voltage requirements for each device?
The ADN2850BCPZ250 operates from a single 2.7 V to 5.5 V supply. The ADN2811ACPZ-CML operates from a 3.3 V supply. Designs must account for these different supply requirements if both devices are used on the same board.
What are the target applications for the ADN2850BCPZ250 versus the ADN2811ACPZ-CML?
The ADN2850BCPZ250 targets general-purpose analog signal conditioning, including instrumentation, industrial control, and programmable gain/offset circuits. The ADN2811ACPZ-CML targets SONET/SDH OC-48/STM-16 optical receivers, transponders, and line cards requiring clock and data recovery.
Do the ADN2850BCPZ250 and ADN2811ACPZ-CML support the same communication interfaces?
No. The ADN2850BCPZ250 uses a 4-wire SPI-compatible serial interface for programming the digital potentiometer. The ADN2811ACPZ-CML provides a CML-compatible serial data output and does not use a digital potentiometer programming interface. Interface requirements are therefore not compatible.
Can the ADN2850BCPZ250 and ADN2811ACPZ-CML be used together in a single design?
Yes, they can coexist in a system because they perform different functions. For example, the ADN2850BCPZ250 could be used for analog trimming or calibration, while the ADN2811ACPZ-CML handles clock and data recovery in the same optical networking board. Each device must be designed to its own supply, interface, and layout requirements.