Part A
ADN2850BCPZ250
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7397 Stückzahl
- Package
- LFCSP-16
- Series
- Datenerfassung
Replacement verdict
Not a drop-in replacement
The ADN2850BCPZ250 and ADN2805ACPZ-RL7 are fundamentally different devices: the former is a dual-channel digital potentiometer (nonvolatile memory, 250 kΩ, SPI interface) while the latter is a clock and data recovery IC for optical networking. They serve unrelated functions, occupy different footprints, and cannot be substituted for one another in any design.
Different device function
Different package footprint
Different interface type
Different signal domain
Parts at a glance
Part B
ADN2805ACPZ-RL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2973 Stückzahl
- Package
- WFQFN-32
- Series
- Takt- und anwendungsspezifisch
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 | ADN2805ACPZ-RL7 | Why it matters |
|---|---|---|---|
| Function / Device Type | Dual-channel, nonvolatile digital potentiometer (256-position) | Clock and data recovery (CDR) IC for 1.25 Gbps | These are fundamentally different device classes, so they are not functionally substitutable in any design. |
| Primary Application | Programmable resistance/voltage adjustment, calibration, gain and offset trimming | Signal conditioning in optical/backplane receivers; recovers clock and retimes data | Application domain determines whether the part can serve the intended circuit role at all. |
| Data Rate / Bandwidth | Not applicable (potentiometer; no serial data rate) | 1.25 Gbps | The CDR's rated data rate must match the system link speed; a potentiometer has no comparable spec. |
| Interface | SPI-compatible serial interface | CML data/clock inputs and outputs (no digital control bus) | Control and signal interfaces must match the host system; these parts use entirely different signaling. |
| Supply Voltage | 2.7 V to 5.5 V (dual supply capable) | 3.3 V nominal (3.0 V to 3.6 V) | Supply rails must be compatible with the board power architecture for the device to operate. |
| Package | 24-lead LFCSP (CP-24) | 32-lead LFCSP (CP-32) | Footprint and pin count must match the PCB layout; different packages are not drop-in compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both meet industrial temperature requirements, so thermal range is not a differentiator here. |
| Nonvolatile Memory | Yes (EEPROM stores wiper settings) | No | Nonvolatile retention allows the potentiometer to power up in a known state; the CDR has no such feature. |
| Key Performance Metric | 250 kΩ end-to-end resistance, ±1% resistor tolerance | Jitter performance and CDR lock range at 1.25 Gbps | The dominant performance spec differs entirely, reflecting the incompatible functions of the two parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADN2850BCPZ250 | ADN2805ACPZ-RL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| PLL | - | Yes |
| Main Purpose | - | SONET/SDH |
| Input | - | CML |
| Output | - | LVDS |
| Number of Circuits | - | 1 |
| Ratio - Input: Output | - | 1:2 |
| Differential - Input: Output | - | Yes/Yes |
| Frequency - Max | - | 1.25GHz |
| Voltage - Supply | - | 3V ~ 3.6V |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
Are the ADN2850BCPZ250 and ADN2805ACPZ-RL7 functionally interchangeable?
No. The ADN2850BCPZ250 is a dual-channel, 250 kΩ nonvolatile digital potentiometer (digipot) with an SPI-compatible interface, while the ADN2805ACPZ-RL7 is a 1.25 Gbps clock and data recovery (CDR) IC with a limiting amplifier. They serve entirely different signal-chain functions and cannot be substituted for one another.
What are the key differences in primary function between these two devices?
The ADN2850BCPZ250 provides digitally controlled variable resistance for gain, offset, or attenuation adjustment in analog signal paths. The ADN2805ACPZ-RL7 recovers a clock from a serial data stream and retimes the data at rates up to 1.25 Gbps, typically for optical or backplane receiver applications.
Do the ADN2850BCPZ250 and ADN2805ACPZ-RL7 use the same package and pinout?
No. The ADN2850BCPZ250 is supplied in a 32-lead LFCSP (5 mm × 5 mm) package, while the ADN2805ACPZ-RL7 is supplied in a 32-lead LFCSP (5 mm × 5 mm) package as well, but the pin assignments and functions differ completely because the two devices have unrelated internal architectures. Package similarity does not imply pin or footprint compatibility.
What supply voltages do the ADN2850BCPZ250 and ADN2805ACPZ-RL7 require?
The ADN2850BCPZ250 operates from a single 2.7 V to 5.5 V supply (with separate VDD and digital supply considerations per the datasheet). The ADN2805ACPZ-RL7 operates from a 3.3 V ± 5% supply. Designs must not assume a common rail without verifying each datasheet.
Can the ADN2850BCPZ250 be used for clock and data recovery in a 1.25 Gbps link?
No. The ADN2850BCPZ250 is a digital potentiometer and contains no CDR, limiting amplifier, or high-speed serial interface. Clock and data recovery at 1.25 Gbps requires a dedicated CDR device such as the ADN2805ACPZ-RL7.
What is the resolution and interface of the ADN2850BCPZ250?
The ADN2850BCPZ250 is a 10-bit (1024-position) dual-channel digital potentiometer with a nominal 250 kΩ end-to-end resistance, controlled via an SPI-compatible serial interface and featuring nonvolatile EEMEM storage for wiper settings.
What data rate does the ADN2805ACPZ-RL7 support and what output does it provide?
The ADN2805ACPZ-RL7 supports serial data rates up to 1.25 Gbps and provides recovered clock and retimed data outputs (CML/LVPECL-compatible per datasheet), along with a loss-of-lock indicator, making it suitable for 1.25 Gbps Ethernet and similar links.
Are these devices qualified for the same temperature range?
Both the ADN2850BCPZ250 and ADN2805ACPZ-RL7 are specified for the industrial temperature range of −40 °C to +85 °C per their respective Analog Devices datasheets. Always confirm the exact grade and ordering code against the current datasheet before design release.