Analog Devices Inc./Maxim Integrated DS4303R+T&R

Overview

The DS4303R+T&R from Maxim Integrated is a nonvolatile electronically programmable voltage reference IC in SOT23-5 package, delivering precise ±1mV adjustable output (0.3V to VCC–0.3V) with ±1mA drive capability, low 1.1–1.6mA supply current, and EEPROM-persistent calibration-used for factory-trimmed power-supply calibration and offset nulling in embedded instrumentation.

For engineers reviewing the DS4303R+T&R datasheet, DS4303R+T&R pinout, DS4303R+T&R application, or DS4303R+T&R equivalent, key selection criteria include its in-circuit self-adjust settling time (11–15ms/V), ±104µV/°C tempco at 0.4V output, 21dB PSRR at 200kHz, and guaranteed 50,000-program-cycle EEPROM endurance under +70°C conditions.

Technical Context

The DS4303R+T&R implements a closed-loop DAC-based adjustment architecture: VIN sets target voltage, ADJ initiates self-adjustment, internal 12-bit DAC iteratively tunes VOUT until tracking accuracy (±20mV) is met, then stores final value in on-chip EEPROM. No external components are required for basic operation.

It operates from a single 2.4V–3.6V supply, supports continuous VOUT short-circuit protection, and maintains output stability across –40°C to +85°C ambient-enabling post-assembly recalibration without hardware modification or rework.

Key Specifications

Pinout & Package

DS4303R+T&R is housed in a lead-free 5-pin SOT23-5 package (marking: 4303+), with exposed pad not connected internally. Standard JEDEC MO-178AC footprint, 1.6mm × 2.9mm body size, 0.95mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6126AASA+ and LT6654BHS6-3#TRMPBF, the DS4303R+T&R uniquely combines nonvolatile programmability, ±1mV resolution, and SOT23-5 footprint-making it the only option supporting automated, post-assembly voltage trimming without layout changes or BOM proliferation.

Availability

DS4303R+T&R is available at Aetrix Electronics and suitable for power-supply calibration, threshold setting, offset nulling, and pressure bridge excitation requiring stable component supply across industrial, medical, and automotive production programs.

Supply support for DS4303R+T&R 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, communications, and consumer applications.

The DS4303R+T&R belongs to Maxim's programmable voltage reference product line, engineered specifically to replace manual calibration methods with automated, EEPROM-backed in-circuit trimming for factory test and system-level accuracy optimization.

FAQ

What is the minimum stable voltage required on VIN to initiate DS4303R+T&R programming?

The DS4303R+T&R requires VIN to be stable within ±1mV for at least 100ns before ADJ toggling. Per datasheet, VIN must be between 0.3V and VCC–0.3V (e.g., 0.3V–3.3V at VCC=3.6V). Instability exceeding ±1mV during the self-adjust period causes VOUTTA (±20mV tracking error) to degrade. DS4303R+T&R does not specify a minimum slew rate, but rapid VIN transients induce quantization uncertainty.

Can DS4303R+T&R be reprogrammed after soldering onto a PCB?

Yes-DS4303R+T&R supports full post-assembly recalibration. Its ADJ and VIN pins remain accessible via test points or bed-of-nails fixtures. The device tolerates standard reflow profiles and operates reliably from –40°C to +85°C. Reprogramming requires only stable VIN, a clean ADJ toggle, and sufficient time for ∆VOUT × tST settling plus tW (9–12ms) EEPROM write. DS4303R+T&R retains all settings through power cycling and thermal stress.

Does DS4303R+T&R require external decoupling capacitors?

Yes-Maxim recommends a 0.01µF or 0.1µF ceramic capacitor placed directly between VCC and GND, mounted as close as possible to the DS4303R+T&R pins. This minimizes supply noise coupling and prevents false triggering during power-up. Without decoupling, supply transients may cause unintended ADJ activation due to capacitive coupling on the ADJ pin, risking accidental programming. DS4303R+T&R's internal design assumes this external capacitance for stable operation.

What is the maximum load capacitance allowed on DS4303R+T&R's VOUT pin?

The DS4303R+T&R datasheet specifies a maximum VOUT load capacitance of 100pF. Exceeding this value risks instability and extended settling time during self-adjustment or transient response. For larger capacitive loads (e.g., ADC sample-and-hold inputs), a unity-gain buffer amplifier must be used. DS4303R+T&R's internal compensation is optimized for ≤100pF; higher values degrade phase margin and may cause oscillation or overshoot in VOUT.

How does DS4303R+T&R's temperature coefficient compare across different output voltages?

DS4303R+T&R's tempco varies with VOUT setting: at 0.4V output, it is ±104µV/°C (–40°C to +85°C); at 3.0V output, it improves to –31 to +6 ppm/°C (+25°C to +85°C). This reflects inherent curvature in the DAC transfer function and bandgap reference topology. DS4303R+T&R achieves best stability near mid-supply outputs; users calibrating at extremes (e.g., 0.3V or 3.3V) should verify system-level drift using actual VOUT values-not just typical ppm/°C specs.