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Analog Devices Inc./Maxim Integrated DS4305R+U
- Part No.:
- DS4305R+U
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
DS4305R+U.pdf
- Description:
- IC VREF SERIES ADJ 0.61% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,580
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Product details
Overview
The DS4305R+U from Maxim Integrated is a nonvolatile electronically programmable voltage reference IC with 5-pin SOT23 package, ±1.5mV quantization accuracy, 4.0V–5.5V supply range, and -40°C to +125°C operating temperature. It serves as a factory-trimmable precision reference in power-supply calibration and sensor bias circuits.
For engineers reviewing the DS4305R+U datasheet, DS4305R+U pinout, DS4305R+U application, or DS4305R+U equivalent, this page delivers verified electrical specs, real-world trimming workflow context, terminal-level design meaning, and validated alternative options for production-grade voltage reference selection.
Technical Context
The DS4305R+U implements a closed-loop self-adjust architecture: VIN sets target output, ADJ initiates EEPROM-programmed DAC calibration, and VOUT tracks VIN within ±20mV tracking accuracy before storing final value. Its internal 12-bit DAC and on-chip EEPROM enable single-cycle programming with 9–12ms write time.
It operates as a series-mode reference (not shunt), supports ±1mA load current, features 28dB PSRR at 200kHz, and delivers low-noise performance (160µVP-P @ 0.1–10Hz). Temperature coefficient is specified from -40°C to +125°C with ppm/°C variation dependent on VOUT setting and temperature zone.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.3V to VCC–0.3V - Enables low-voltage biasing down to 300mV, unlike shunt references limited by minimum cathode voltage. |
| Quantization Accuracy | ±1.5mV - Defines smallest programmable step size; determines final trim resolution after EEPROM storage. |
| Temperature Coefficient | -43 to -3 ppm/°C (VOUT=5.0V, +85°C to +125°C) - Specifies worst-case drift per degree over extended industrial range. |
| Supply Current | 1.4mA typ @ +25°C, VCC=5.0V - Active quiescent draw during adjustment; impacts system power budget in always-on calibration nodes. |
| EEPROM Endurance | 50,000 programming cycles @ +70°C - Limits number of field or rework recalibrations before wear-out risk increases. |
| Load Regulation | 2.5mV/mA max - Output voltage shift per mA load change; critical for stable bias under varying sensor current draw. |
| PSRR | 28dB @ 200kHz - Power-supply ripple rejection capability; defines immunity to switching regulator noise coupling into reference path. |
Pinout & Package
DS4305R+U uses a lead-free 5-lead SOT23 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, with gull-wing leads and thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ADJ | Adjust Control Input | Active-low programming trigger; must be held low ≥100ns to initiate self-adjust cycle; sensitive to capacitive coupling during power-up. |
| 2 - GND | Ground Reference | Analog and digital ground return; requires low-impedance connection to minimize offset error and noise coupling. |
| 3 - VIN | Sample Voltage Input | Stable analog reference input used as target for VOUT tracking; must remain constant throughout entire adjustment sequence. |
| 4 - VOUT | Voltage Output | Programmed output node; drives external circuitry up to ±1mA; short-circuit protected; requires ≤100pF capacitive load. |
| 5 - VCC | Power-Supply Voltage | Single 4.0–5.5V supply; powers internal DAC, EEPROM, and control logic; requires local 0.01µF ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Nonvolatile EEPROM Storage | Retains programmed VOUT indefinitely across power cycles and temperature extremes (-40°C to +125°C), eliminating need for battery-backed memory or external NVM. |
| In-Circuit Programmability | Enables fully automated factory calibration using bed-of-nails fixtures-no manual potentiometers or laser trimming required. |
| Wide Output Range | Supports VOUT from 300mV up to VCC–300mV, allowing precise biasing of low-voltage sensors and amplifiers incompatible with traditional 2.5V/4.096V fixed references. |
| Self-Adjusting Architecture | Internally compares VIN to VOUT via ADC and adjusts 12-bit DAC until match is achieved within ±20mV, removing system-level errors from external components. |
| Short-Circuit Protected Output | Withstands continuous VOUT-to-GND shorts without damage or parameter shift-critical for robustness in high-volume manufacturing test environments. |
Applications
| Power-Supply Calibration | Threshold Setting |
|---|---|
Use Scenario: Calibrating output voltage of isolated DC-DC converters in telecom power modules prior to shipment. IC Role / Device Role / Timing Role: Precision programmable reference replacing hand-selected resistor networks in feedback divider. Use Value: Achieves ±0.5% output accuracy after automated trim, reducing calibration labor by 70% versus manual methods. | Use Scenario: Setting overvoltage/undervoltage detection thresholds in battery management systems for EV traction inverters. IC Role / Device Role / Timing Role: Adjustable reference input to comparator or ADC monitoring cell stack voltage. Use Value: Enables post-assembly fine-tuning to compensate for PCB trace resistance and connector contact resistance variations. |
| Offset Nulling | Pressure Bridges |
Use Scenario: Nulling input offset voltage of instrumentation amplifiers used in medical ECG front-ends. IC Role / Device Role / Timing Role: Programmable nulling voltage source injected into amplifier's offset adjust pin. Use Value: Delivers sub-millivolt nulling resolution (±1.5mV), improving common-mode rejection ratio by >10dB over fixed trim solutions. | Use Scenario: Providing excitation voltage and reference for Wheatstone bridge pressure transducers in industrial process controllers. IC Role / Device Role / Timing Role: Stable, programmable bridge reference and ADC reference sharing same VOUT node. Use Value: Eliminates ratio-metric error between excitation and measurement paths, enabling <0.1% full-scale linearity without matched resistor arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar electronically programmable voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6190AESA+ | Fixed 4.096V output, no programmability; 3ppm/°C TC, 1.8µVP-P noise; SO8 package. | Suitable only where factory-set reference suffices; lacks in-field recalibration capability. | Select when absolute stability and ultra-low noise outweigh need for post-assembly trim flexibility. |
| LT6654BHS6-3.3#TRMPBF | Fixed 3.3V output, 10ppm/°C TC, ±10µV initial accuracy; SOT23-6 package with shutdown pin. | No EEPROM or adjustment interface; optimized for low-drift, not programmability. | Choose for high-precision sensor signal chains requiring minimal drift-not for calibration workflows. |
Compared with MAX6190AESA+ and LT6654BHS6-3.3#TRMPBF, the DS4305R+U uniquely combines nonvolatile programmability, wide output range, and SOT23 footprint-enabling automated calibration without redesigning reference topology or increasing board area.
Availability
DS4305R+U is available at Aetrix Electronics and suitable for power-supply calibration, threshold setting, and offset nulling applications requiring stable component supply across automotive, industrial, and medical electronics programs.
Supply support for DS4305R+U 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 demanding industrial, automotive, and communications applications.
The DS4305R+U belongs to Maxim's programmable reference product line, engineered specifically to replace mechanical trims and discrete resistor networks in automated factory calibration systems.
FAQ
What is the programming procedure for the DS4305R+U?
The DS4305R+U is programmed by applying a stable voltage to VIN, pulling ADJ low for ≥100ns, then releasing it. The device self-adjusts VOUT to match VIN within ±20mV, stores the result in EEPROM after 9–12ms, and retains it indefinitely. DS4305R+U requires no external programming hardware-only controlled voltage and timing signals.
Can the DS4305R+U be reprogrammed after soldering onto a PCB?
Yes, the DS4305R+U supports full in-circuit reprogramming post-assembly. Its ADJ and VIN pins remain accessible for automated test fixtures, enabling final calibration after environmental stress testing or aging. DS4305R+U tolerates up to 50,000 EEPROM cycles at +70°C, supporting multiple reworks.
What is the maximum capacitive load the DS4305R+U can drive on VOUT?
The DS4305R+U specifies a maximum VOUT load capacitance of 100pF. Exceeding this may cause instability or overshoot during transient events. For higher-capacitance loads, an external buffer amplifier is required. This limit ensures reliable settling behavior during self-adjust and maintains specified load regulation of 2.5mV/mA.
Does the DS4305R+U require external decoupling capacitors?
Yes, a 0.01µF ceramic capacitor placed between VCC and GND, mounted directly adjacent to the DS4305R+U pins, is mandatory for stable operation. This minimizes supply-induced noise coupling and prevents false triggering of the ADJ pin during power-up transients-critical for preventing inadvertent programming of DS4305R+U.
How does temperature affect the output voltage accuracy of the DS4305R+U?
DS4305R+U output voltage drift is characterized as temperature coefficient (TC), ranging from -43 to -3 ppm/°C depending on VOUT level and temperature zone. At VOUT = 5.0V and +85°C to +125°C, TC is -43 to -23 ppm/°C-translating to ~−215µV/°C drift. Full accuracy must be evaluated per application temperature profile using DS4305R+U's published TC curves.
DS4305R+U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 0.3V
- Voltage - Output (Max):
- 5.2 V
- Current - Output:
- 1 mA
- Tolerance:
- ±0.61%
- Temperature Coefficient:
- 60ppm/°C
- Noise - 0.1Hz to 10Hz:
- 160µVp-p
- Noise - 10Hz to 10kHz:
- 23µVrms
- Voltage - Input:
- 4V ~ 5.5V
- Current - Supply:
- 2.1mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
DS4305R+U FAQ
1.How can I place an order for DS4305R+U through Aetrix?
Please submit a Request for Quotation (RFQ) for DS4305R+U on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS4305R+U reliable?
The price and inventory of DS4305R+U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS4305R+U is usually 5 days.
3.What payment methods are accepted for DS4305R+U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS4305R+U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS4305R+U?
DS4305R+U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS4305R+U order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS4305R+U?
For technical support, including DS4305R+U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS4305R+U requirements.
6.How does Aetrix verify that DS4305R+U is sourced from the original manufacturer or authorized distributors?
All DS4305R+U products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS4305R+U meets industry standards.
7.What is the process for return or replacement of DS4305R+U?
All DS4305R+U units undergo pre-shipment inspection (PSI). If there is an issue with DS4305R+U, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS4305R+U part is unused and in its original packaging.
Return procedure for DS4305R+U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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