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Analog Devices Inc./Maxim Integrated MAX6325CSA+T
- Part No.:
- MAX6325CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6325CSA+T.pdf
- Description:
- IC VREF SERIES 0.04% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,599
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Product details
Overview
MAX6325CSA+T from Maxim Integrated is a precision 2.5V voltage reference IC using buried-zener technology, delivering ±0.02% initial accuracy, 0.5ppm/°C typical temperature coefficient, and 1.5µVp-p (0.1Hz–10Hz) output noise. It operates from 8V to 36V input, supplies ±15mA, and targets high-resolution ADC/DAC biasing in test equipment and industrial control systems.
For engineers reviewing the MAX6325CSA+T datasheet, MAX6325CSA+T pinout, MAX6325CSA+T application, or MAX6325CSA+T equivalent, key selection criteria include its 2.5V output stability over temperature, low-noise performance critical for 16-bit data converters, optional external trim and NR capacitor support, and SO-8 package compatibility with standard PCB layouts.
Technical Context
The MAX6325CSA+T implements a temperature-compensated buried-zener core achieving laboratory-grade stability without heater power, enabling flat ∆VOUT vs. temperature curves across –40°C to +85°C. Its internal architecture supports simultaneous sourcing and sinking up to ±15mA while maintaining <30ppm/1000hr long-term stability.
Output regulation is specified under both line (8V–36V input) and load (0–15mA) variations, with guaranteed load regulation of 5ppm/mA and line regulation of 10ppm/V. The device features stable operation with capacitive loads from 0µF to 100µF and includes dedicated NR and TRIM pins for wideband noise reduction and ±1% output adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.5mV - tight tolerance enables direct use in 16-bit SAR ADC reference inputs without calibration. |
| Tempco (max) | 1ppm/°C - ensures ≤16ppm drift over 0°C to +70°C operating range, critical for metrology-grade instruments. |
| Initial Accuracy | ±0.02% - translates to ±0.5mV absolute error at 2.5V, supporting high-accuracy current source design. |
| Output Noise | 1.5µVp-p (0.1Hz–10Hz) - ultra-low flicker noise preserves SNR in precision weigh-scale and sensor signal chains. |
| Supply Current | 1.8mA (typ) - enables low-power operation in battery-backed data loggers and portable calibration tools. |
| Load Regulation | 5ppm/mA - maintains reference integrity when driving DAC buffers or op-amp gain stages with dynamic current draw. |
| Long-Term Stability | 30ppm/1000hr - guarantees minimal drift during extended deployment in ATE fixtures and process controllers. |
Pinout & Package
MAX6325CSA+T is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, with 1.27mm pitch and gull-wing leads. Thermal resistance θJA is 5.88mW/°C above +70°C, supporting 471mW max continuous dissipation at ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8 | Internally Connected | No external connection required; internal bonding only - must remain unconnected on PCB. |
| 2 | IN | Positive supply input (8V–36V); requires local 2.2µF bypass capacitor to GND for ripple rejection. |
| 3 | NR | Noise reduction node; connect 1µF capacitor to GND to reduce wideband noise by >20dB above 10Hz. |
| 4 | GND | Analog ground reference; star-point connection recommended to minimize ground bounce in mixed-signal systems. |
| 5 | TRIM | External voltage adjust input; accepts 10kΩ potentiometer between OUT and GND for ±1% fine-tuning without affecting tempco. |
| 6 | OUT | Stable 2.5V reference output; capable of sourcing/sinking ±15mA with <100mΩ effective output impedance at DC. |
Key Features
| Feature | Design Value |
|---|---|
| Buried-zener core | Enables 0.5ppm/°C typical tempco and 1.5µVp-p low-frequency noise - superior to bandgap references in metrology applications. |
| Optional NR capacitor | 1µF on NR pin reduces integrated noise by 40% (0.1Hz–10Hz), directly improving ENOB in 16-bit ADC systems. |
| ±15mA drive capability | Eliminates need for external buffer op-amps when driving multiple SAR ADC references or precision current mirrors. |
| Stable with 0–100µF load capacitance | Permits direct connection to large decoupling caps on noisy digital boards without oscillation risk. |
| Trim-adjustable output | Supports system-level calibration via external potentiometer, enabling end-of-line correction of board-level errors. |
Applications
| High-Resolution Data Acquisition | Digital Voltmeters |
|---|---|
Use Scenario: 16-bit SAR ADC front-end in automated test equipment requiring sub-LSB reference stability over temperature and time. IC Role / Device Role / Timing Role: Primary voltage reference providing excitation and conversion基准 for analog input channel. Use Value: 0.5ppm/°C tempco and 30ppm/1000hr stability ensure measurement repeatability across thermal cycles and multi-year deployments. | Use Scenario: Portable handheld DVM with autoranging and 5½-digit resolution needing low-drift, low-noise reference under battery-powered operation. IC Role / Device Role / Timing Role: Precision reference for dual-slope integrator and ADC reference ladder. Use Value: 1.5µVp-p (0.1Hz–10Hz) noise and ±0.02% accuracy enable true 5½-digit resolution without averaging. |
| Industrial Process Controllers | Precision Current Sources |
Use Scenario: Loop-powered 4–20mA transmitter in hazardous environments where long-term calibration stability is mandated by IEC 61508. IC Role / Device Role / Timing Role: Reference for DAC-controlled current output stage and sensor excitation circuitry. Use Value: ±15mA sink/source capability allows direct drive of current-setting resistors and op-amp feedback networks without external transistors. | Use Scenario: Programmable current source for strain-gauge or RTD excitation in weigh scales and pressure transmitters. IC Role / Device Role / Timing Role: Stable 2.5V reference feeding instrumentation amplifier gain-setting network and DAC reference input. Use Value: External TRIM pin enables factory calibration to compensate for PCB trace resistance and component tolerances, achieving <0.05% total error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025IDR | 2.5V output, 3ppm/°C max tempco, 1.2µVp-p noise, 10mA max output, SO-8 package | Lower noise but higher tempco and reduced drive strength; requires external buffer for >10mA loads | Select REF5025IDR when ultra-low noise dominates over temperature drift and load drive requirements. |
| ADR441BRZ | 2.5V output, 1.5ppm/°C max tempco, 1.75µVp-p noise, ±10mA output, SO-8 package | Slightly higher noise and lower drive capability; uses XFET topology instead of buried-zener | Choose ADR441BRZ when long-term stability (20ppm/1000hr) and lower supply current (1.1mA) are prioritized over peak load drive. |
Compared with MAX6325CSA+T, REF5025IDR offers lower noise but sacrifices temperature stability and output drive, while ADR441BRZ trades minor noise and tempco penalties for improved power efficiency and aging performance - making MAX6325CSA+T optimal for high-drive, high-stability 16-bit converter systems.
Availability
MAX6325CSA+T is available at Aetrix Electronics and suitable for high-resolution analog-to-digital converters, digital voltmeters, and industrial process controllers requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MAX6325CSA+T 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, medical, and test equipment applications.
The MAX6325CSA+T belongs to Maxim's precision voltage reference product line, engineered specifically for metrology-grade stability and low-noise performance in high-resolution data-conversion systems.
FAQ
What is the maximum input voltage rating for MAX6325CSA+T?
The MAX6325CSA+T has an absolute maximum input voltage rating of 40V referenced to GND. However, its specified operating input voltage range is 8V to 36V. Operation above 36V risks exceeding safe power dissipation limits and may degrade long-term stability. For reliable 2.5V reference performance, maintain VIN within 8V–36V and use a 2.2µF input bypass capacitor as shown in the typical operating circuit.
Does MAX6325CSA+T require an external capacitor on the NR pin?
No, the NR pin on MAX6325CSA+T is optional - it can be left open if wideband noise reduction is not required. When used, a 1µF capacitor to GND reduces integrated output noise by ~40% in the 0.1Hz–10Hz band. Larger values provide diminishing returns, and the device remains fully functional with NR unconnected. This flexibility allows designers to optimize for noise performance versus board space constraints in each application.
Can MAX6325CSA+T drive a 10kΩ load directly?
Yes, MAX6325CSA+T can directly drive a 10kΩ load with negligible error. At 2.5V output and 10kΩ load, current draw is 0.25mA - well within its ±15mA sourcing/sinking capability. Load regulation is specified at 5ppm/mA, so the resulting error is <1.25ppm (0.003mV), far below its ±0.02% initial accuracy. No buffer amplifier is needed for standard high-impedance ADC reference inputs or op-amp bias networks.
What is the purpose of the TRIM pin on MAX6325CSA+T?
The TRIM pin on MAX6325CSA+T enables ±1% output voltage adjustment using an external 10kΩ potentiometer connected between OUT and GND, with the wiper tied to TRIM. This allows system-level calibration to correct for PCB trace resistance, solder joint variance, or downstream component tolerances. Crucially, external trimming does not degrade the device's 0.5ppm/°C temperature coefficient or long-term stability, preserving metrology-grade performance after adjustment.
Is MAX6325CSA+T compatible with ceramic output capacitors?
Yes, MAX6325CSA+T is explicitly characterized and guaranteed stable with output capacitive loads from 0µF to 100µF - including X7R and C0G ceramic types. Unlike many references requiring minimum ESR, this device uses a robust internal compensation scheme that prevents peaking or oscillation even with zero-ESR ceramics. This simplifies layout in space-constrained applications and improves transient response during load steps without adding series resistance.
MAX6325CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series, Buried Zener
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.04%
- Temperature Coefficient:
- 1ppm/°C
- Noise - 0.1Hz to 10Hz:
- 1.5µVp-p
- Noise - 10Hz to 10kHz:
- 1.3µVrms
- Voltage - Input:
- 8V ~ 36V
- Current - Supply:
- 3mA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6325CSA+T FAQ
1.How can I place an order for MAX6325CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6325CSA+T 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 MAX6325CSA+T reliable?
The price and inventory of MAX6325CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6325CSA+T is usually 5 days.
3.What payment methods are accepted for MAX6325CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6325CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6325CSA+T?
MAX6325CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6325CSA+T 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 MAX6325CSA+T?
For technical support, including MAX6325CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6325CSA+T requirements.
6.How does Aetrix verify that MAX6325CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX6325CSA+T 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 MAX6325CSA+T meets industry standards.
7.What is the process for return or replacement of MAX6325CSA+T?
All MAX6325CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6325CSA+T, 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 MAX6325CSA+T part is unused and in its original packaging.
Return procedure for MAX6325CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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