Analog Devices Inc. ADN2848ACPZ-32-RL

Overview

ADN2848ACPZ-32-RL from Analog Devices is a 3.3 V dual-loop laser diode driver IC for optical transmitters, supporting 50 Mbps to 1.25 Gbps data rates with closed-loop average power and extinction ratio control. It delivers bias current up to 100 mA and modulation current up to 80 mA, features integrated laser fail/degrade alarms, automatic laser shutdown (ALS), and operates across −40°C to +85°C in SONET/SDH/Gigabit Ethernet systems.

For engineers reviewing the ADN2848ACPZ-32-RL datasheet, ADN2848ACPZ-32-RL pinout, ADN2848ACPZ-32-RL application, or ADN2848ACPZ-32-RL equivalent, key selection criteria include its dual-loop control architecture, 32-pin LFCSP_VQ package with exposed thermal pad, compliance with ITU-T G.958 transmitter alarm requirements, and support for both AC- and DC-coupled laser interfacing without external compensation components.

Technical Context

The ADN2848ACPZ-32-RL implements two independent analog control loops: one for average optical power (via PSET and PAVCAP) and one for extinction ratio (via ERSET and ERCAP), each configurable for continuous or high-speed operation using LBWSET and capacitor values. Both loops operate without external op-amps or discrete feedback networks.

It accepts differential ac-coupled data inputs (DATAP/DATAN) and optional clock inputs (CLKP/CLKN), supports CLKSEL-selectable clocked mode, and provides mirrored monitor outputs (IBMON, IMMON, IMPDMON) referenced to VCC with 100:1 and 1:1 division ratios respectively - enabling real-time system-level diagnostics without signal path disruption.

Key Specifications

Pinout & Package

The ADN2848ACPZ-32-RL uses a 32-lead, 5 mm × 5 mm LFCSP_VQ (CP-32-7) package with exposed thermal pad (EPAD) requiring connection to ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX3736AETE+ and LMH6522RTVT, the ADN2848ACPZ-32-RL uniquely integrates dual-loop optical control with standardized alarm signaling in a single 3.3 V IC - reducing BOM count by ≥7 passive components and eliminating firmware development for closed-loop laser management.

Availability

ADN2848ACPZ-32-RL is available at Aetrix Electronics and suitable for SONET OC-12, Fibre Channel 2G, and Gigabit Ethernet SFP applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for ADN2848ACPZ-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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and industrial systems.

The ADN2848ACPZ-32-RL belongs to Analog Devices' optical networking product line, designed specifically for high-reliability, temperature-stable laser diode control in telecom and datacom transceivers compliant with SONET, SDH, and Fibre Channel standards.

FAQ

What is the maximum data rate supported by the ADN2848ACPZ-32-RL?

The ADN2848ACPZ-32-RL supports data rates from 50 Mbps up to 1.25 Gbps, validated per specification Table 1 with rise/fall times ≤170 ps and random jitter ≤1.5 ps RMS into a 25 Ω load at 622 Mbps. This range covers SONET OC-1/3/12/24, SDH STM-0/1/4, and Gigabit Ethernet physical layers.

How does the ADN2848ACPZ-32-RL implement closed-loop extinction ratio control?

The ADN2848ACPZ-32-RL uses the ERSET pin (1.1–1.3 V reference) and ERCAP capacitor to configure a dedicated analog loop that continuously adjusts modulation current relative to bias current, maintaining P1/P0 ratio independent of laser aging or temperature drift. This eliminates manual ER tuning required by single-loop drivers like the MAX3736AETE+.

Can the ADN2848ACPZ-32-RL be used with both AC-coupled and DC-coupled laser diodes?

Yes - the ADN2848ACPZ-32-RL supports both configurations: CCBIAS tied to IBIAS for AC coupling (removes DC headroom constraint), or CCBIAS tied to VCC for DC coupling (simplifies layout). Figure 8 and Figure 9 in the datasheet show verified reference circuits for each mode, including RZ pull-up recommendations (200–500 Ω).

What alarm functions are provided by the ADN2848ACPZ-32-RL and how are they configured?

The ADN2848ACPZ-32-RL provides FAIL and DEGRADE alarms per ITU-T G.958, configured via a single ASET resistor to ground. FAIL triggers at full threshold current (e.g., 50 mA IBIAS), DEGRADE at 90% of that value. Both outputs are active-high with 30 kΩ internal pull-ups, enabling direct interface to FPGA GPIO or microcontroller interrupt pins.

Is the ADN2848ACPZ-32-RL compatible with digital optical supervisors such as the ADN2850?

Yes - the ADN2848ACPZ-32-RL PSET and ERSET pins accept voltage inputs from digital potentiometers. The ADN2850 dual 10-bit digital potentiometer is explicitly recommended in the datasheet (Figure 7) to replace mechanical potentiometers, enabling remote calibration, EEPROM storage of settings, and <50 ppm/°C temperature coefficient for long-term optical stability.