Analog Devices Inc. ADN8810ACPZ

Overview

ADN8810ACPZ from Analog Devices is a 12-bit high-precision current source IC designed for laser diode bias control, delivering programmable output current from 0 mA to 300 mA with 2.5 V output compliance voltage, ±4 LSB integral nonlinearity, and 3-wire SPI interface. It operates with separate analog (AVDD), digital (DVDD), and power-stage (PVDD) supplies and integrates fault detection for open/short load conditions.

For engineers reviewing the ADN8810ACPZ datasheet, ADN8810ACPZ pinout, ADN8810ACPZ application, or ADN8810ACPZ equivalent, key selection considerations include full-scale current programmability via dual external sense resistors, low 7.5 nA/√Hz current noise at 250 mA, 3 µs settling time, thermal-aware power dissipation modeling, and multi-device daisy-chain capability up to eight units on one SPI bus.

Technical Context

The ADN8810ACPZ implements a precision 12-bit DAC core driving a high-current output amplifier stage with independent PVDD supply and dual-sense-resistor feedback (RSN and FB pins) for accurate current regulation. Its architecture supports programmable maximum current scaling and includes dedicated fault detection circuitry tied to the IOUT path.

It uses a 3-wire SPI interface with 3-bit address decoding (ADDR0–ADDR2), enabling up to eight devices on a shared bus. Standby (SB) and asynchronous RESET inputs provide system-level control over output state and register initialization without requiring host processor intervention.

Key Specifications

Pinout & Package

ADN8810ACPZ is housed in a 24-lead, 4 mm × 4 mm LFCSP package with exposed thermal pad (EPAD) that must be soldered to DGND for thermal and electrical integrity. The package supports high-current operation with dedicated PVDD, AVDD, and DVDD rails, and separates analog/digital grounds (AVSS/DVSS/DGND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision current source applications.

Compared with MAX5722ETE+ and AD5750ACPZ, the ADN8810ACPZ uniquely combines 300 mA output, integrated open/short load detection, dual-sense-resistor calibration, and dedicated PVDD for thermal optimization-making it purpose-built for tunable laser bias control rather than generalized current sourcing.

Availability

ADN8810ACPZ is available at Aetrix Electronics and suitable for tunable laser modules, automated test equipment, fiber-optic amplifier designs, and photonic integrated circuit controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADN8810ACPZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with deep expertise in precision instrumentation and photonics solutions.

The ADN8810ACPZ belongs to Analog Devices' laser diode driver and precision current source product line, engineered specifically for high-stability, low-noise biasing of tunable lasers in telecom, datacom, and test instrumentation applications.

FAQ

What is the maximum output current capability of the ADN8810ACPZ?

The ADN8810ACPZ delivers up to 300 mA of programmable output current, set by external sense resistors (e.g., 1.37 Ω for full scale). This rating is guaranteed across −40°C to +85°C with 2.5 V compliance voltage. The ADN8810ACPZ achieves this using a dedicated PVDD supply and dual-sense-resistor feedback, enabling direct drive of laser diode sections without external amplification.

How does the ADN8810ACPZ implement fault detection?

The ADN8810ACPZ monitors load condition via its FAULT pin, which asserts high when detecting either an open load (IOUT voltage > PVDD − 0.6 V) or short load (IOUT voltage < AVSS + 0.2 V). This logic-level output is referenced to DVDD and requires no external components. The ADN8810ACPZ integrates this function directly into its output stage, eliminating need for discrete comparators or sense amplifiers in laser bias designs.

Can multiple ADN8810ACPZ devices share the same SPI bus?

Yes - the ADN8810ACPZ supports up to eight devices on a single SPI bus using its 3-bit hardware address (ADDR0–ADDR2). Each device responds only to commands matching its unique address byte (A3–A0, where A3 is always 0). The ADN8810ACPZ's 3-wire interface (CS/SCLK/SDI) and deterministic timing (12.5 MHz max SCLK) enable synchronized multi-device programming without arbitration overhead.

What is the role of the ENCOMP pin on the ADN8810ACPZ?

The ENCOMP pin on the ADN8810ACPZ must be connected to AVSS (analog ground) to enable internal compensation for stable operation. Leaving ENCOMP unconnected or floating may cause instability or oscillation in the output amplifier loop. This connection is mandatory per the ADN8810ACPZ functional description and pin configuration diagram; it is not optional or configurable.

Does the ADN8810ACPZ support dithering of the output current?

Yes - the ADN8810ACPZ supports current dithering by modulating its VREF input, as documented in Figure 19 of the datasheet. Applying a small AC signal (e.g., via AD8605 op amp) to the 4.096 V reference input directly scales the full-scale current, enabling precise low-frequency dither without modifying the SPI data stream. This method preserves DAC resolution and avoids digital quantization artifacts inherent in code-stepping techniques.