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Analog Devices Inc./Maxim Integrated MAX6325CSA+
- Part No.:
- MAX6325CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6325CSA+.pdf
- Description:
- IC VREF SERIES 0.04% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:263
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Product details
Overview
MAX6325CSA+ 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 load current, and targets high-resolution ADC/DAC biasing in test equipment and industrial control systems.
For engineers reviewing the MAX6325CSA+ datasheet, MAX6325CSA+ pinout, MAX6325CSA+ application, or MAX6325CSA+ equivalent, key selection criteria include its 2.5V fixed output, 8-pin SO package, low-noise performance, trim/noise-reduction terminals, and compatibility with capacitive loads up to 100µF without instability.
Technical Context
The MAX6325CSA+ employs a buried-zener core with on-chip temperature compensation to achieve laboratory-grade stability-0.5ppm/°C typical TC and 30ppm/1000hr long-term drift-without heater power. Its output stage supports bidirectional ±15mA current, enabling direct driving of DAC reference inputs or op-amp buffers.
It features three dedicated auxiliary terminals: TRIM for ±1% external adjustment via 10kΩ potentiometer, NR for optional 1µF wideband noise reduction capacitor, and IN/GND/OUT pins configured for stable operation across 8V–36V supply range and full temperature range (0°C to +70°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±1mV at +25°C - enables 16-bit ADC full-scale reference with ≤0.04% error budget |
| Tempco (TCVOUT) | 0.5ppm/°C typical, 1ppm/°C max - ensures ≤2.5ppm total drift over 0°C to +70°C ambient |
| Noise (0.1Hz–10Hz) | 1.5µVp-p - contributes <0.0006 LSB noise to 16-bit 2.5V full-scale system |
| Initial Accuracy | ±0.02% (±500µV) - eliminates need for system-level calibration in precision metrology |
| Load Regulation | 5ppm/mA - maintains output stability under dynamic load shifts up to ±15mA |
| Line Regulation | 10ppm/V - rejects supply ripple across full 8V–36V input range |
| Long-Term Stability | 30ppm/1000hr - supports >1-year uncalibrated operation in ATE and calibration standards |
Pinout & Package
MAX6325CSA+ is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, with 1.27mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot; pins 1, 7, and 8 are internally connected and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8 | I.C. (Internally Connected) | No external connection required; floating or tied to GND has no effect |
| 2 | IN | Positive supply input (8V–36V); requires local 2.2µF bypass to GND per datasheet Figure 1 |
| 3 | NR | Noise reduction node; connect 1µF capacitor to GND to reduce wideband noise by ~30% |
| 4 | GND | Analog ground reference; star-point connection recommended for low-noise layouts |
| 5 | TRIM | External voltage divider tap for ±1% output adjustment; open-circuit = nominal 2.500V |
| 6 | OUT | Stable 2.5V reference output; drives capacitive loads up to 100µF without oscillation |
Key Features
| Feature | Design Value |
|---|---|
| Buried-zener core | Enables 1.5µVp-p ultra-low noise and 0.5ppm/°C tempco without heater power |
| Trim-adjustable output | ±1% fine-tuning via external 10kΩ potentiometer preserves tempco and noise performance |
| Noise-reduction terminal (NR) | 1µF capacitor reduces integrated noise by 30% without affecting DC accuracy or stability |
| Capacitive-load immunity | Stable with 0–100µF output capacitance-eliminates need for isolation resistors in buffered designs |
| ±15mA bidirectional drive | Sinks or sources full 15mA load current-directly interfaces with SAR ADC reference inputs and op-amp buffers |
Applications
| High-Resolution Data Converters | Precision Current Sources |
|---|---|
Use Scenario: Reference input for 16-bit successive-approximation ADCs in portable multimeters and sensor signal chains. IC Role / Device Role / Timing Role: Provides stable 2.5V reference with sub-ppm thermal drift to define ADC full-scale voltage. Use Value: Enables 16-bit linearity (≤0.0015% INL) without recalibration across 0°C–70°C operating range. | Use Scenario: Setpoint generator for programmable current sources in automated test equipment (ATE) channel cards. IC Role / Device Role / Timing Role: Fixed 2.5V reference feeding precision op-amp/I-to-V converter to generate 0–100mA calibrated output. Use Value: Delivers ±0.02% initial accuracy and 30ppm/1000hr stability-reducing ATE calibration frequency by 5× vs. standard references. |
| Digital Voltmeters | Industrial Process Control |
Use Scenario: Primary reference in handheld 6½-digit DVMs requiring <10ppm absolute accuracy over 24-hour period. IC Role / Device Role / Timing Role: Low-noise 2.5V source for dual-slope integrator and auto-zero amplifier stages. Use Value: 1.5µVp-p noise and 0.5ppm/°C TC ensure <0.0005% reading uncertainty at 2.5V range. | Use Scenario: Calibration reference for 4–20mA transmitter modules in hazardous-area PLC I/O systems. IC Role / Device Role / Timing Role: Stable excitation source for RTD/thermocouple signal conditioning and analog output DACs. Use Value: 1ppm/°C max tempco and -40°C to +85°C extended variants (e.g., MAX6325ESA+) support Class I Div 2 certification. |
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, 3ppm/°C max tempco, 3.8µVp-p noise, 10mA max output, SO-8 | Higher noise and looser tempco; lacks TRIM/NR pins | Lower-cost option where ±0.05% accuracy and 3ppm/°C drift are acceptable |
| ADR441BRZ | 2.5V, 1.5ppm/°C max tempco, 1.75µVp-p noise, ±10mA output, SO-8 | Similar noise but lower drive capability; no NR pin; higher quiescent current (1.2mA vs. 1.8mA) | Preferred when sourcing from Analog Devices ecosystem or needing tighter long-term drift spec (20ppm/1000hr) |
Compared with REF5025IDR and ADR441BRZ, the MAX6325CSA+ offers superior temperature stability (1ppm/°C max), lower noise (1.5µVp-p), and unique trim/noise-reduction flexibility-making it optimal for metrology-grade 16-bit data acquisition where reference-induced errors must stay below 0.001%.
Availability
MAX6325CSA+ is available at Aetrix Electronics and suitable for high-resolution data converters, precision current sources, digital voltmeters, and industrial process control systems requiring stable component supply across production lifecycles.
Supply support for MAX6325CSA+ 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+ belongs to Maxim's ultra-stable voltage reference product line, engineered specifically for metrology, high-bit-depth data conversion, and calibration-critical instrumentation where sub-ppm stability and ultra-low noise are mandatory.
FAQ
What is the maximum input voltage rating for the MAX6325CSA+?
The MAX6325CSA+ has an absolute maximum input voltage (IN to GND) of 40V, but its specified operating range is 8V to 36V. Operation above 36V risks exceeding internal power dissipation limits-even briefly-and may degrade long-term stability. For reliable 0°C to +70°C operation, maintain VIN within 8V–36V and use a 2.2µF input bypass capacitor as shown in the typical operating circuit.
Does the MAX6325CSA+ require an external capacitor on the NR pin to function?
No, the MAX6325CSA+ operates fully functional with the NR pin left open. Adding a 1µF capacitor to NR reduces wideband noise by approximately 30%, but omitting it does not affect output voltage accuracy, temperature coefficient, or stability. The NR capacitor is optional and only needed in ultra-low-noise applications such as 18-bit+ data acquisition or precision metrology standards.
Can the MAX6325CSA+ drive a 10µF output capacitor without oscillation?
Yes, the MAX6325CSA+ is explicitly characterized and guaranteed stable with output capacitance from 0µF to 100µF across all load currents (±15mA) and temperatures (0°C to +70°C). This eliminates the need for series isolation resistors or ferrite beads in buffer-stage designs-unlike many older references that require strict COUT limits or damping networks.
What is the purpose of the TRIM pin on the MAX6325CSA+?
The TRIM pin on the MAX6325CSA+ allows ±1% external adjustment of the 2.5V output using a 10kΩ potentiometer connected between OUT and GND, with the wiper to TRIM. This adjustment does not degrade temperature coefficient or noise performance. It is used for final system calibration or to compensate for PCB trace resistance-never intended for dynamic control or feedback loops.
Is the MAX6325CSA+ pin-compatible with other members of the MAX6325/MAX6341/MAX6350 family?
Yes, the MAX6325CSA+, MAX6341CSA+, and MAX6350CSA+ share identical 8-pin SO package footprints and pinouts-including IN, GND, NR, TRIM, and OUT assignments. However, their output voltages differ (2.5V, 4.096V, 5.0V), so substituting one for another requires verifying downstream circuit compatibility with the new reference voltage level.
MAX6325CSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX6325CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6325CSA+ 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+ reliable?
The price and inventory of MAX6325CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6325CSA+ is usually 5 days.
3.What payment methods are accepted for MAX6325CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6325CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6325CSA+?
MAX6325CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6325CSA+ 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+?
For technical support, including MAX6325CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6325CSA+ requirements.
6.How does Aetrix verify that MAX6325CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX6325CSA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6325CSA+?
All MAX6325CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6325CSA+, 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+ part is unused and in its original packaging.
Return procedure for MAX6325CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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