Analog Devices Inc. ADN2847ACPZ-32-RL

Overview

ADN2847ACPZ-32-RL from Analog Devices is a 3.3 V dual-loop laser diode driver IC supporting 50 Mbps to 3.3 Gbps data rates, delivering bias current up to 100 mA and modulation current up to 80 mA with typical 80 ps rise/fall times. It integrates closed-loop average optical power and extinction ratio control for SONET/SDH transmitters, featuring laser fail/degrade alarms and automatic laser shutdown (ALS) for fiber-optic line cards.

For engineers reviewing the ADN2847ACPZ-32-RL datasheet, ADN2847ACPZ-32-RL pinout, ADN2847ACPZ-32-RL application, or ADN2847ACPZ-32-RL equivalent, this page delivers verified specifications, LFCSP-32 package mapping, DWDM-compatible dual MPD monitoring capability, and real-world design context for high-speed optical transmitter modules operating across −40°C to +85°C.

Technical Context

The ADN2847ACPZ-32-RL implements two independent analog control loops: one for average optical power (via PSET and PAVCAP) and another for extinction ratio (via ERSET and ERCAP), both using monitor photodiode (MPD) feedback. Its dual-loop architecture eliminates need for external temperature compensation or LD characterization.

It supports ac-coupled and dc-coupled laser interfacing, includes programmable alarm thresholds via ASET resistor, and provides mirrored current outputs (IBMON, IMMON, IMPDMON) for system-level diagnostics. The 32-lead LFCSP variant omits IDTONE and IMPDMON2 pins present in the 48-lead version, confirming its targeted use in single-MPD, non-fiber-identification applications.

Key Specifications

Pinout & Package

The ADN2847ACPZ-32-RL is housed in a 32-lead lead-frame chip-scale package (LFCSP) measuring 5 mm × 5 mm with an exposed thermal pad on the bottom. The package requires connection of the exposed pad to either VCC or GND plane for optimal thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar laser diode driver applications.

Compared with MAX3736AETE+T and LMH6570MA/NOPB, the ADN2847ACPZ-32-RL uniquely delivers production-ready dual-loop control in a single IC, reducing bill-of-materials count by 12 components and eliminating iterative laser characterization during manufacturing calibration.

Availability

ADN2847ACPZ-32-RL is available at Aetrix Electronics and suitable for SONET OC-48 line cards, Fibre Channel 2G/4G transceivers, and industrial Gigabit Ethernet optical modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for ADN2847ACPZ-32-RL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.

The ADN2847ACPZ-32-RL belongs to Analog Devices' optical networking product line, engineered specifically for high-reliability, high-speed laser diode control in telecom and datacom infrastructure equipment.

FAQ

What is the maximum data rate supported by the ADN2847ACPZ-32-RL?

The ADN2847ACPZ-32-RL supports data rates from 50 Mbps up to 3.3 Gbps, validated per SONET OC-48 and SDH STM-16 standards. Its 80 ps typical rise/fall time and low random jitter (1.5 ps RMS) ensure clean eye diagrams at full speed, with performance confirmed using 11110000 pattern testing at 2.5 Gbps into 25 Ω loads.

Does the ADN2847ACPZ-32-RL support dual monitor photodiodes (dual MPD)?

No - the ADN2847ACPZ-32-RL is the 32-lead LFCSP variant and supports only single MPD operation. Dual MPD functionality (IMPD2, IMPDMON2, IDTONE) is exclusive to the 48-lead LFCSP package (e.g., ADN2847ACPZ-48-RL). Pinout documentation confirms IMPD2 and IDTONE are unassigned in the 32-lead configuration.

How does the ADN2847ACPZ-32-RL implement automatic laser shutdown (ALS)?

The ADN2847ACPZ-32-RL asserts ALS by pulling both IBIAS and IMOD outputs to ≤0.1 mA within 5 μs of ALS pin going high. This action drops MPD current to zero, triggering the FAIL alarm. The ALS function complies with ITU-T G.958 section 9.7 and is hardware-enforced - no firmware or external logic required for fail-safe laser disable.

Can the ADN2847ACPZ-32-RL be used with both AC-coupled and DC-coupled laser diodes?

Yes - the ADN2847ACPZ-32-RL supports both configurations. For AC coupling, CCBIAS is tied to IBIAS; for DC coupling, CCBIAS connects to VCC. The datasheet provides validated reference circuits (Figures 14 and 15) including RZ pull-up (200–500 Ω) and bypass capacitor guidelines to maintain signal integrity across 50 Mbps–3.3 Gbps.

What is the thermal resistance (θJA) of the ADN2847ACPZ-32-RL package?

The ADN2847ACPZ-32-RL has a thermal resistance θJA of 32°C/W, measured under worst-case surface-mount conditions per JEDEC JESD51-7. This value assumes proper soldering of the exposed thermal pad to a solid copper plane. At 50 mA supply current and 80 mA IMOD, die temperature remains below 125°C up to +85°C ambient with standard 2-layer PCB layout.