Analog Devices Inc./Maxim Integrated DS4303K

Overview

DS4303K from Maxim Integrated is a nonvolatile electronically programmable voltage reference IC used for precision factory calibration of analog subsystems. It delivers ±1mV output quantization, 2.4V–3.6V single-supply operation, and EEPROM-stored VOUT values across -40°C to +85°C operating range-enabling automated trimming in power-supply calibration and offset nulling circuits.

For engineers reviewing the DS4303K datasheet, DS4303K pinout, DS4303K application, or DS4303K equivalent, this device supports in-circuit voltage adjustment via VIN/ADJ interface, offers ±104µV/°C max tempco at low VOUT, and provides 1.1mA typical supply current with 100pF load capability-critical for high-accuracy embedded calibration systems.

Technical Context

The DS4303K integrates a 12-bit DAC, EEPROM storage, and internal control logic to implement sample-and-hold voltage programming: VIN sets target output, ADJ triggers self-adjustment, and VOUT settles within ±20mV tracking accuracy before EEPROM write (9–12ms). Its architecture eliminates external resistors and mechanical trims by digitizing calibration.

It operates as a series voltage reference-not shunt-with GND-referenced output, enabling low-voltage operation down to 0.3V above GND. The internal RPD (95kΩ) and RPU (18kΩ) define input bias paths, while VOUT drives ±1mA with short-circuit protection and 5.5mV/mA load regulation.

Key Specifications

Pinout & Package

SOT23-5 package (5-pin, 2.9mm × 1.6mm footprint), RoHS-compliant, top-mark "4303" or "4303+"; thermal pad not present; standard JEDEC MO-178AC outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Compared with MAX6126AASA+ and LT6654BHS6-3.3#TRMPBF, the DS4303K uniquely supports per-unit programmability and nonvolatile storage-making it the only option for automated, post-assembly calibration workflows where fixed references cannot compensate for system-level tolerances.

Availability

DS4303K is available at Aetrix Electronics and suitable for power-supply calibration, threshold setting, offset nulling, and bias adjusting applications requiring stable component supply, RoHS compliance, and SOT23-5 footprint compatibility.

Supply support for DS4303K 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications systems-emphasizing integration, reliability, and ease of system calibration.

The DS4303K belongs to Maxim's programmable voltage reference product line, engineered specifically to replace manual factory trims with automated, in-system calibration-reducing manufacturing cost and time-to-market for high-accuracy analog subsystems.

FAQ

What is the programming procedure for the DS4303K?

The DS4303K is programmed by applying a stable voltage to VIN, then toggling ADJ low for ≥100ns. VOUT self-adjusts to match VIN within ±20mV, then stores the value in EEPROM after 9–12ms. This process can be repeated up to 50,000 times. The DS4303K retains its programmed VOUT indefinitely-even after power cycling-making it ideal for factory calibration workflows where repeatability and nonvolatility are essential.

Can the DS4303K be reprogrammed after final assembly?

Yes-the DS4303K supports full in-system reprogramming after PCB assembly and functional test. Its VIN/ADJ interface allows access via bed-of-nails fixtures or flying probes, enabling final calibration of system-level errors (e.g., resistor tolerance, op-amp offset). This capability eliminates pre-calibrated component inventory and reduces scrap rates. The DS4303K's ±1mV quantization ensures fine-grained correction without iterative hardware changes.

What is the minimum output voltage the DS4303K can generate?

The DS4303K supports VOUT as low as 0.3V above GND-well below the 1.2–1.3V practical floor of most shunt references. This capability enables use in ultra-low-voltage applications such as coin-cell-powered sensors and sub-1V rail monitoring. At 0.3V output, the DS4303K maintains ±104µV/°C temperature coefficient and 5.5mV/mA load regulation-preserving accuracy even at minimum operating point.

Does the DS4303K require external passive components for basic operation?

No-only a 0.01µF ceramic decoupling capacitor between VCC and GND is recommended for optimal PSRR and noise performance. Unlike traditional trim solutions, the DS4303K needs no external resistors, pots, or DACs: VIN provides the reference, ADJ triggers programming, and VOUT delivers the calibrated voltage directly. This simplifies layout, reduces BOM count, and improves long-term reliability compared to mechanical trims.

How does the DS4303K handle power-up sequencing to avoid accidental programming?

The DS4303K avoids spurious writes by requiring a clean, fast ADJ low pulse (≥100ns) after power stabilization-capacitive loading on ADJ must be minimized (<10pF) to prevent slow rise/fall edges from mimicking a valid toggle. Layout guidance recommends routing ADJ away from noisy signals and avoiding stubs. Once powered, the DS4303K remains inert until explicitly triggered-ensuring robustness in automated test environments where the DS4303K is deployed.