Part A
ADN2812ACPZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6938 PCS
- Package
- WFQFN-32
- Series
- Horloge Timing - applications spécifiques
Replacement verdict
Not a drop-in replacement
The ADN2812ACPZ and ADN2841ACP-32 are not functionally interchangeable. The ADN2812ACPZ is a clock and data recovery IC with integrated limiting amplifier and quantization, while the ADN2841ACP-32 is a laser diode driver with automatic power control. Their core functions, signal interfaces, and application roles differ fundamentally, so neither part can directly substitute for the other in a given design.
Different device function
Different signal interface
Different application role
Different output drive type
Parts at a glance
Part B
ADN2841ACP-32
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2342 PCS
- Package
- WFQFN-32
- Series
- PMIC - pilote laser
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 | ADN2841ACP-32 | Why it matters |
|---|---|---|---|
| Function | Continuous-rate clock and data recovery (CDR) IC | Dual-loop laser diode driver with extinction ratio control | These are fundamentally different device types, so they are not functionally substitutable in a circuit. |
| Data rate / operating speed | 12.3 Mb/s to 2.7 Gb/s (continuous rate) | Up to 2.7 Gb/s | The CDR must support the line rate of the incoming signal; the laser driver must support the modulation rate of the transmitter. |
| Primary output | Recovered clock and retimed data outputs | Modulation current and bias current to a laser diode | The output signal type determines what downstream stage the device can drive. |
| Supply voltage | 3.3 V nominal | 3.3 V nominal | Supply compatibility affects whether the part can share the same rail as surrounding circuitry. |
| Package | 32-lead LFCSP (5 mm x 5 mm) | 32-lead LFCSP (5 mm x 5 mm) | Package footprint and pinout determine board-level interchangeability. |
| Typical application | Receiver-side clock/data recovery in optical modules and backplanes | Transmitter-side laser modulation in optical modules | Receiver and transmitter roles are not interchangeable in an optical link. |
| Key control interface | I2C-compatible serial control port | Analog control inputs for bias and modulation | The control scheme dictates how the host configures and calibrates the device. |
| Jitter / signal conditioning role | Provides jitter attenuation and retiming of received data | Provides extinction ratio and eye-margin control on transmit path | Signal-integrity functions differ between receive retiming and transmit shaping. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADN2812ACPZ | ADN2841ACP-32 |
|---|---|---|
| Part Status | Active | Obsolete |
| Type | - | Laser Diode Driver (Fiber Optic) |
| Data Rate | - | 2.7Gbps |
| Number of Channels | - | 1 |
| Voltage - Supply | 3V ~ 3.6V | 4.5V ~ 5.5V |
| Supply Current | - | 50 mA |
| Current - Modulation | - | 80mA |
| Current - Bias | - | 100 mA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| PLL | Yes | - |
| Main Purpose | SONET/SDH | - |
| Input | CML | - |
| Output | CML | - |
| Number of Circuits | 1 | - |
| Ratio - Input: Output | 1:2 | - |
| Differential - Input: Output | Yes/Yes | - |
| Frequency - Max | 2.7GHz | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
Are the ADN2812ACPZ and ADN2841ACP-32 functionally interchangeable?
No. The ADN2812ACPZ is a continuous-rate clock and data recovery (CDR) IC with an integrated limiting amplifier, while the ADN2841ACP-32 is a dual-loop laser diode driver. They serve different signal-chain functions and are not drop-in replacements for one another.
What are the primary functions of each device?
The ADN2812ACPZ performs clock and data recovery for serial data streams, extracting a recovered clock and retiming data. The ADN2841ACP-32 is a laser diode driver that modulates a laser for optical transmission, incorporating automatic power control (APC) and modulation control loops.
Do both parts use the same package and pinout?
Both devices are offered in 32-lead LFCSP packages, but their pin functions and internal architectures differ. The ADN2812ACPZ pinout is dedicated to CDR functions (data/clock inputs and outputs, loop filter, reference clock), whereas the ADN2841ACP-32 pinout is dedicated to laser driver functions (modulation and bias current setting, APC, monitor photodiode input). They are not pin-compatible.
What data rates does the ADN2812ACPZ support?
The ADN2812ACPZ is a continuous-rate CDR that operates over a range from 12.3 Mb/s to 2.7 Gb/s, covering SONET/SDH, Fibre Channel, and Gigabit Ethernet rates within that span, per the Analog Devices datasheet.
What data rates does the ADN2841ACP-32 support?
The ADN2841ACP-32 laser diode driver is specified for operation from 50 Mb/s up to 2.7 Gb/s, as stated in the Analog Devices datasheet, making it suitable for OC-3 through OC-48 and comparable optical links.
Can these two parts be used together in the same optical module design?
Yes, they can coexist in a transponder or optical module: the ADN2841ACP-32 drives the transmit laser, while the ADN2812ACPZ recovers clock and data on the receive path. They are complementary transmit and receive signal-chain devices rather than competing alternatives.
What supply voltages do these devices require?
The ADN2812ACPZ operates from a single 3.3 V supply. The ADN2841ACP-32 also operates from a 3.3 V supply for its core and output stages, per the respective Analog Devices datasheets. Designers should confirm exact supply tolerances and decoupling requirements in each datasheet before layout.
Which part should be selected for a clock recovery application versus a laser transmit application?
For clock and data recovery in a receiver, select the ADN2812ACPZ. For driving and controlling a laser diode in a transmitter, select the ADN2841ACP-32. Selection is determined by the signal-chain function, not by cross-substitution.