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Analog Devices Inc./Maxim Integrated MAX6194CESA
- Part No.:
- MAX6194CESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6194CESA.pdf
- Description:
- IC VREF SERIES 0.22% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,815
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Product details
Overview
MAX6194CESA from Maxim Integrated is a precision, micropower, low-dropout series voltage reference delivering a stable 4.500V output with ±2mV initial accuracy, 5ppm/°C max temperature coefficient, and 35µA max quiescent current - ideal for high-accuracy ADC/DAC biasing in battery-powered handheld instruments.
For engineers reviewing the MAX6194CESA datasheet, MAX6194CESA pinout, MAX6194CESA application, or MAX6194CESA equivalent, this page provides verified specifications, SO-8 package details, load-regulation behavior at 500µA, dropout performance down to 100mV, and real-world alternatives for precision analog systems requiring long-term stability and low-noise references.
Technical Context
The MAX6194CESA uses a curvature-corrected bandgap architecture with laser-trimmed thin-film resistors to achieve <5ppm/°C temperature coefficient and ±2mV (±0.044%) initial accuracy over -40°C to +85°C. It operates as a series-mode reference, sourcing or sinking up to ±500µA while maintaining regulation.
Internally compensated for stability with capacitive loads up to 2.2nF, it achieves 180µs turn-on settling time to 0.1% and exhibits 0.16µV/µA load regulation and 25µV/V line regulation - enabling use in fast-settling, low-power precision data acquisition systems without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.500V ±2mV (guaranteed initial tolerance supports 16-bit ADC reference accuracy) |
| Temp Coefficient | ≤5ppm/°C (max drift of ±0.18mV over full -40°C to +85°C range) |
| Quiescent Current | ≤35µA (enables >1-year battery life in 10µA-sleep systems) |
| Dropout Voltage | 100mV at 500µA load (supports operation from 4.6V supply in 5V-rail systems) |
| Load Regulation | 0.16µV/µA (output shift ≤80µV across full ±500µA load range) |
| Noise (0.1–10Hz) | 215µVRMS (limits contribution to 18-bit system noise floor) |
| Capacitive Load Stability | Stable with 0–2.2nF (allows direct connection to ADC input caps without oscillation) |
Pinout & Package
MAX6194CESA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and rated for -40°C to +85°C operation. Pins 1, 3, 5, 7, and 8 are no-connect (N.C.) terminals; only IN, GND, and OUT are functional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 2 (IN) | Supply Input | Accepts 4.7V to 12.6V input; supplies internal bandgap core and output stage |
| 4 (GND) | Analog Ground | Reference return path; must be low-impedance and separated from digital ground |
| 6 (OUT) | Precision Output | Delivers regulated 4.500V; capable of sourcing/sinking ±500µA with <100mV dropout |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | Enables ±2mV initial accuracy and <5ppm/°C tempco without external calibration |
| Curvature-correction circuit | Reduces parabolic error across temperature, improving mid-range stability |
| Series-mode architecture | Draws only 35µA quiescent current regardless of load - unlike shunt references that waste current |
| Internal compensation | Eliminates need for external compensation components; stable with up to 2.2nF load capacitance |
| Low-output impedance | Supports fast transient response (<180µs settling) into capacitive ADC inputs |
Applications
| Hand-Held Instruments | Analog-to-Digital Converters |
|---|---|
Use Scenario: Portable multimeter with 16-bit sigma-delta ADC operating on coin-cell battery. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion, providing stable 4.500V scale. Use Value: ±2mV initial accuracy and 5ppm/°C tempco ensure measurement repeatability across field temperature variations without recalibration. |
Use Scenario: Isolated industrial sensor node digitizing thermocouple signals via 18-bit SAR ADC. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for ADC VREF pin, directly driving 100pF input capacitance. Use Value: 0.16µV/µA load regulation and 2.2nF capacitive-load stability eliminate external buffer, reducing BOM count and board area. |
| Industrial Process Control | Precision 3V/5V Systems |
Use Scenario: Loop-powered 4–20mA transmitter with HART modulation requiring stable 4.5V reference for DAC and signal conditioning. IC Role / Device Role / Timing Role: Precision reference shared between DAC, op-amp biasing, and HART carrier generation circuitry. Use Value: 35µA quiescent current enables full functionality within 3.5mA loop budget; 100mV dropout allows operation from 4.6V derived rail. |
Use Scenario: FPGA-based data logger using 5V system rail to power 4.5V-referenced analog front-end. IC Role / Device Role / Timing Role: High-accuracy reference decoupled from noisy 5V supply via local LDO or resistor-divider + filter. Use Value: 25µV/V line regulation and 84dB ripple rejection suppress supply noise coupling into measurement path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR4545BRTZ-REEL7 | 4.500V output, ±1.5mV initial accuracy, 3ppm/°C max tempco, 950µA quiescent current | Higher power consumption limits use in ultra-low-power battery systems; superior tempco suits metrology-grade designs | Select when ultimate temperature stability outweighs battery life constraints |
| REF5045AIDR | 4.500V output, ±0.5mV initial accuracy, 3ppm/°C max tempco, 950µA quiescent current, integrated thermal shutdown | Not suitable for sub-100µA systems; higher drive capability (10mA) supports buffered reference distribution | Choose for high-drive, high-accuracy applications where supply current is not constrained |
Compared with ADR4545BRTZ-REEL7 and REF5045AIDR, the MAX6194CESA delivers best-in-class micropower operation (35µA vs. >900µA) at the cost of slightly relaxed initial accuracy and tempco - making it optimal for portable, long-life instrumentation where efficiency is critical and ±2mV/5ppm meets system-level requirements.
Availability
MAX6194CESA is available at Aetrix Electronics and suitable for handheld instruments, precision ADC/DAC biasing, and industrial process control systems requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6194CESA 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 high-performance analog and mixed-signal ICs for precision, power, and interface applications.
The MAX6190–MAX6195/MAX6198 family was engineered specifically for micropower, low-dropout voltage reference needs in battery-operated and space-constrained precision measurement systems.
FAQ
What is the maximum load current supported by the MAX6194CESA while maintaining regulation?
The MAX6194CESA can source or sink up to ±500µA while maintaining output regulation within specified limits. At 500µA load, dropout voltage remains ≤100mV, and load regulation is characterized at 0.16µV/µA - meaning total output shift stays under 80µV across the full load range. This capability supports direct driving of ADC reference inputs and precision op-amp bias networks without external buffering.
Does the MAX6194CESA require an external output capacitor for stability?
No, the MAX6194CESA is internally compensated and stable with output capacitance ranging from 0 to 2.2nF. Unlike many references, it does not require a minimum output capacitor for phase margin. An external capacitor may be added to improve transient response during large load steps, but it is optional - enabling minimal footprint designs where board space is constrained.
What is the supply voltage range for the MAX6194CESA?
The MAX6194CESA operates with a supply voltage from (VOUT + 0.2V) = 4.7V minimum to 12.6V maximum. This 4.7V–12.6V range ensures compatibility with standard 5V rails while allowing headroom for dropout and line variation. Operation below 4.7V risks loss of regulation; above 12.6V exceeds absolute maximum ratings and may cause permanent damage.
How does the MAX6194CESA's quiescent current behave across input voltage and temperature?
The MAX6194CESA draws ≤35µA quiescent current across its full operating range. Supply current varies by only ≤2µA/V with input voltage and remains stable from -40°C to +85°C - typically 27–35µA. This near-constant current minimizes power budget uncertainty in battery-powered systems and eliminates the need for dynamic current modeling in energy calculations.
Is the MAX6194CESA pin-compatible with other devices in the MAX6190–MAX6195/MAX6198 family?
Yes, all devices in the MAX6190–MAX6195/MAX6198 family, including MAX6194CESA, share identical 8-pin SO package pinout: Pin 2 = IN, Pin 4 = GND, Pin 6 = OUT; Pins 1/3/5/7/8 are N.C. This allows drop-in replacement across output voltages (1.25V to 5.0V) and accuracy grades (A/B/C), provided the system's supply voltage and load requirements align with the selected variant.
MAX6194CESA 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:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500 µA
- Tolerance:
- ±0.22%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- 110µVp-p
- Noise - 10Hz to 10kHz:
- 215µVrms
- Voltage - Input:
- 4.7V ~ 12.6V
- Current - Supply:
- 35µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6194CESA FAQ
1.How can I place an order for MAX6194CESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6194CESA 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 MAX6194CESA reliable?
The price and inventory of MAX6194CESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6194CESA is usually 5 days.
3.What payment methods are accepted for MAX6194CESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6194CESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6194CESA?
MAX6194CESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6194CESA 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 MAX6194CESA?
For technical support, including MAX6194CESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6194CESA requirements.
6.How does Aetrix verify that MAX6194CESA is sourced from the original manufacturer or authorized distributors?
All MAX6194CESA 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 MAX6194CESA meets industry standards.
7.What is the process for return or replacement of MAX6194CESA?
All MAX6194CESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6194CESA, 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 MAX6194CESA part is unused and in its original packaging.
Return procedure for MAX6194CESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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