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Analog Devices Inc./Maxim Integrated MAX6168AESA+
- Part No.:
- MAX6168AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6168AESA+.pdf
- Description:
- IC VREF SERIES 0.11% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:286
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Product details
Overview
MAX6168AESA+ from Maxim Integrated is a precision, micropower, low-dropout series voltage reference delivering a stable 1.800V output with ±2mV initial accuracy and 5ppm/°C max temperature coefficient over -40°C to +85°C. It sources up to 5mA, sinks 2mA, operates from (VOUT + 200mV) to 12.6V, and draws only 100μA typical supply current-ideal for high-accuracy ADC biasing in portable battery-powered systems.
For engineers reviewing the MAX6168AESA+ datasheet, MAX6168AESA+ pinout, MAX6168AESA+ application, or MAX6168AESA+ equivalent, key selection criteria include its 5ppm/°C tempco, 200mV max dropout at 1mA, 0.9mV/mA load regulation, 78dB ripple rejection at 120Hz, and SO-8 package compatibility with space-constrained precision analog designs.
Technical Context
The MAX6168AESA+ employs a proprietary curvature-correction circuit and laser-trimmed thin-film resistors to achieve ultra-low drift. Its internal compensation eliminates need for external capacitors, enabling stable operation with 1μF capacitive loads while maintaining 0.1% turn-on settling in 100μs (COUT = 50pF).
As a three-terminal series-mode reference, it delivers supply-current independence (ΔIIN/ΔVIN ≤ 8.0μA/V) and avoids the inefficiency of shunt-mode alternatives. Input voltage range starts at VOUT + 0.2V, supporting low-voltage operation down to 2.0V supply with 1.8V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.800V ±2mV at +25°C - enables direct interface with 1.8V logic and precision ADC reference inputs without scaling. |
| Tempco | 5ppm/°C max - ensures ≤0.45mV drift across -40°C to +85°C, critical for metrology-grade measurements. |
| Dropout Voltage | 200mV max at 1mA load - allows operation from 2.0V supply, extending battery life in single-cell Li-ion or NiMH systems. |
| Supply Current | 100μA typical, ≤120μA max - reduces quiescent power to <1.2μW per volt of supply, ideal for always-on sensor nodes. |
| Load Regulation | 0.9mV/mA sourcing - maintains output stability under dynamic load changes common in multiplexed data acquisition. |
| Noise (0.1–10Hz) | 22μVp-p - supports 16-bit+ resolution in low-frequency precision applications like strain-gauge bridges. |
| Ripple Rejection | 78dB at 120Hz - suppresses AC line noise in offline-powered instrumentation without additional filtering. |
Pinout & Package
MAX6168AESA+ is housed in an 8-pin SO (Small Outline) package with exposed pad (RoHS-compliant, lead-free). Pins 1, 3, 5, 7, and 8 are No Connect (N.C.), internally unconnected. Pin 2 is IN (input voltage), Pin 4 is GND (ground reference), and Pin 6 is OUT (precision 1.800V output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | No Connection (N.C.) | Not bonded or connected internally-must remain unconnected on PCB to avoid parasitic coupling or ESD paths. |
| 2 | IN | Input voltage terminal; accepts 2.0V to 12.6V; requires local 0.1μF ceramic bypass if high line-transient immunity is needed. |
| 4 | GND | Analog ground reference; must be tied to clean system ground plane with low-inductance connection to minimize noise injection. |
| 6 | OUT | Precision 1.800V reference output; capable of sourcing 5mA or sinking 2mA; stable without external capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-corrected bandgap core | Enables 5ppm/°C max tempco without external trimming-reduces calibration cost in production test. |
| Laser-trimmed thin-film resistors | Guarantees ±2mV initial accuracy at +25°C-eliminates post-package adjustment for high-yield manufacturing. |
| No external compensation required | Saves ≥2 mm² board area and removes capacitor-related aging/failure modes in compact portable designs. |
| Stable with 1μF capacitive loads | Supports direct driving of SAR ADC sample capacitors and low-ESR polymer output filters without oscillation. |
| Supply-current independence | ΔIIN/ΔVIN ≤ 8.0μA/V ensures consistent battery drain across operating voltage range-simplifies power modeling. |
Applications
| Portable DMM Front-End | Medical Sensor Signal Chain |
|---|---|
Use Scenario: Handheld digital multimeter measuring DC voltage with 16-bit resolution and auto-ranging. IC Role / Device Role / Timing Role: Provides stable 1.800V reference for dual-slope or sigma-delta ADC, rejecting supply ripple during battery discharge. Use Value: 22μVp-p low-frequency noise and 5ppm/°C tempco enable ±0.01% measurement accuracy across 0–40°C ambient. |
Use Scenario: Wearable ECG monitor digitizing microvolt-level biopotentials using low-power ADC. IC Role / Device Role / Timing Role: Supplies precision bias to instrumentation amplifier and reference to 12-bit SAR ADC sampling at 1kSPS. Use Value: 100μA quiescent current extends coin-cell battery life beyond 1 year; 200mV dropout supports operation down to 2.0V supply. |
| Industrial PLC Analog Input Module | Automotive Cabin Air Quality Sensor |
Use Scenario: DIN-rail mounted PLC module conditioning 4–20mA loop signals with isolated ADC. IC Role / Device Role / Timing Role: Serves as ratiometric reference for isolated ΣΔ ADC, referenced to same 1.8V rail as signal conditioner. Use Value: 78dB 120Hz ripple rejection prevents mains-borne noise from corrupting 16-bit current-loop measurements. |
Use Scenario: In-cabin CO₂ and VOC sensor using NDIR detection with low-power microcontroller. IC Role / Device Role / Timing Role: Powers reference input of integrated ADC in automotive-grade SoC operating from 3.3V LDO. Use Value: -40°C to +85°C guaranteed spec ensures stable 1.800V output across full automotive temperature range without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF198GS | 1.8V output, ±3mV initial accuracy, 8ppm/°C max tempco, 125μA IQ, SO-8 package | Higher tempco and supply current; less suitable for battery-critical or wide-temperature industrial use | Select MAX6168AESA+ when 5ppm/°C stability and 100μA IQ are mandatory for long-term field reliability. |
| ADR3418ARJZ-R7 | 1.8V output, ±2mV initial accuracy, 10ppm/°C max tempco, 120μA IQ, SOT-23-5 package | Smaller footprint but higher tempco; no internal compensation for >1μF loads; limited sink capability (1mA) | Choose MAX6168AESA+ for SO-8 layout reuse, 2mA sink support, and guaranteed stability with 1μF capacitive loads. |
Compared with REF198GS and ADR3418ARJZ-R7, MAX6168AESA+ offers the lowest tempco (5ppm/°C) and lowest quiescent current (100μA) in SO-8, making it optimal for high-stability, ultra-low-power applications where board area is secondary to parametric performance.
Availability
MAX6168AESA+ is available at Aetrix Electronics and suitable for portable DMM front-ends, medical sensor signal chains, and industrial PLC analog input modules requiring stable component supply with full traceability and extended lifecycle support.
Supply support for MAX6168AESA+ 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 and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX6161–MAX6168 family was engineered specifically for high-accuracy, low-power voltage referencing in battery-operated and space-constrained systems-emphasizing micropower operation, low dropout, and elimination of external compensation components.
FAQ
What is the maximum load current that MAX6168AESA+ can source while maintaining specification?
MAX6168AESA+ can source up to 5mA while maintaining its specified load regulation of 0.9mV/mA and output voltage accuracy within ±2mV. At 5mA load, the output voltage change remains ≤4.5mV from nominal 1.800V, ensuring compliance with 12-bit ADC reference requirements. The device also supports 2mA sink capability for active pull-down configurations.
Does MAX6168AESA+ require an external output capacitor for stability?
No, MAX6168AESA+ does not require an external output capacitor for stability due to internal compensation. It remains stable with capacitive loads up to 1μF, and adding a capacitor is optional-used only to improve transient response during step-load changes. This eliminates capacitor-related aging, leakage, and board-area overhead in space-critical designs.
What is the minimum input voltage required for MAX6168AESA+ to regulate at 1.800V?
The minimum input voltage for MAX6168AESA+ is VOUT + 200mV = 2.0V, as specified in the absolute maximum ratings and electrical characteristics. At 1mA load, dropout is guaranteed ≤200mV, allowing reliable regulation down to 2.0V supply-enabling operation from single-cell Li-ion (2.7–4.2V) or NiMH (2.0–2.8V) batteries across full discharge range.
How does the temperature coefficient of MAX6168AESA+ compare to other variants in the MAX6161–MAX6168 family?
MAX6168AESA+ has a maximum temperature coefficient of 5ppm/°C, matching the best-in-family performance shared with MAX6162A, MAX6166A, MAX6163A, MAX6164A, MAX6167A, and MAX6165A. This is superior to the 'B' grade variants (e.g., MAX6168B: 10ppm/°C) and enables tighter thermal drift budgets in unregulated environments.
Can MAX6168AESA+ be used in automotive applications requiring AEC-Q200 qualification?
MAX6168AESA+ is specified for -40°C to +85°C operation and meets industrial reliability standards, but it is not AEC-Q200 qualified. For automotive cabin applications (e.g., air quality sensors) within this temperature range, design validation is required. AEC-Q200-qualified alternatives should be selected for under-hood or safety-critical systems.
MAX6168AESA+ 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
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.11%
- Temperature Coefficient:
- 5ppm/°C
- Noise - 0.1Hz to 10Hz:
- 22µVp-p
- Noise - 10Hz to 10kHz:
- 25µVrms
- Voltage - Input:
- 2.5V ~ 12.6V
- Current - Supply:
- 120µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6168AESA+ FAQ
1.How can I place an order for MAX6168AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6168AESA+ 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 MAX6168AESA+ reliable?
The price and inventory of MAX6168AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6168AESA+ is usually 5 days.
3.What payment methods are accepted for MAX6168AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6168AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6168AESA+?
MAX6168AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6168AESA+ 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 MAX6168AESA+?
For technical support, including MAX6168AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6168AESA+ requirements.
6.How does Aetrix verify that MAX6168AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX6168AESA+ 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 MAX6168AESA+ meets industry standards.
7.What is the process for return or replacement of MAX6168AESA+?
All MAX6168AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6168AESA+, 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 MAX6168AESA+ part is unused and in its original packaging.
Return procedure for MAX6168AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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