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Analog Devices Inc./Maxim Integrated MAX9912EUA+
- Part No.:
- MAX9912EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9912EUA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,207
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Product details
Overview
The MAX9912EUA+ from Maxim Integrated is a dual, rail-to-rail input/output operational amplifier optimized for ultra-low-power, battery-powered precision signal conditioning. It delivers 200kHz gain-bandwidth, 4µA typical supply current per amplifier, 1pA input bias current, and operates from a single 1.8V to 5.5V supply - enabling use in portable medical sensors and low-voltage data-acquisition front-ends.
For engineers reviewing the MAX9912EUA+ datasheet, MAX9912EUA+ pinout, MAX9912EUA+ application, or MAX9912EUA+ equivalent, this page provides verified specifications, dual-channel pin mapping, real-world glucose meter and portable test equipment use cases, and validated alternative op amps with documented functional trade-offs.
Technical Context
The MAX9912EUA+ integrates two independent CMOS op amps in an 8-pin SOT23 package, each featuring unity-gain stability, rail-to-rail I/O swing within 5mV of rails (at 100kΩ load), and 200kHz GBW with 0.1V/µs slew rate. Its BiCMOS process enables ultra-low input bias current (1pA typ) while maintaining ±200µV input offset voltage and 70dB minimum CMRR over temperature.
No shutdown function is implemented - unlike MAX9911/MAX9913 variants - making it suitable for always-on sensing paths where continuous analog signal integrity is prioritized over intermittent power gating. Input common-mode range extends 100mV beyond both supply rails, supporting direct interfacing with resistive sensor bridges and electrode-based biosensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 200kHz - supports stable DC-coupled amplification up to ~100kHz at unity gain in portable instrumentation. |
| Supply Current per Amplifier | 4µA (typ) - enables multi-year battery life in coin-cell–powered devices like handheld glucose meters. |
| Input Bias Current | 1pA (typ) - minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiode transimpedance feedback). |
| Rail-to-Rail I/O Swing | Within 5mV of VSS/VDD at 100kΩ load - maximizes dynamic range in 1.8V–3.3V systems without level-shifting circuitry. |
| Input Offset Voltage | ±0.2mV (typ), ±5mV (max over -40°C to +85°C) - ensures <0.1% gain error in 10-bit ADC front-ends with 1V full-scale input. |
| Common-Mode Rejection Ratio | 70dB (min), 80dB (typ) - suppresses noise from shared supply rails in compact PCB layouts with mixed-signal components. |
| Operating Supply Range | 1.8V to 5.5V - compatible with Li-ion, alkaline, and regulated 3.3V/2.5V system rails without external LDOs. |
Pinout & Package
The MAX9912EUA+ is housed in an 8-pin SOT23 package (package code K8+5), measuring 4.5mm × 3.0mm × 1.45mm, RoHS-compliant and lead-free.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives low-impedance loads directly; high-impedance state not supported (no shutdown). |
| 2 | INA− | Inverting input for Channel A - accepts differential or single-ended signals; high-Z node sensitive to layout parasitics. |
| 3 | INA+ | Noninverting input for Channel A - connects to reference, sensor, or filtered signal source with minimal trace length. |
| 4 | VSS | Negative supply (ground) - requires dedicated low-impedance return path to minimize PSRR degradation. |
| 5 | OUTB | Amplifier B output - electrically isolated from OUTA; enables dual-path signal conditioning on one die. |
| 6 | INB− | Inverting input for Channel B - independent of Channel A; supports simultaneous dual-sensor readout. |
| 7 | INB+ | Noninverting input for Channel B - allows matched gain configuration with Channel A for ratiometric measurements. |
| 8 | VDD | Positive supply - must be bypassed with 0.1µF ceramic capacitor placed ≤2mm from pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent amplifiers | Enables simultaneous signal conditioning of two sensor channels (e.g., glucose RE/WE electrodes) without cross-talk (100dB isolation). |
| Rail-to-rail input common-mode range | Extends 100mV beyond VSS and VDD - supports direct interface with unbuffered resistive sensors operating near supply rails. |
| Ultra-low 1pA input bias current | Reduces voltage error to <10µV across 10MΩ source impedance - critical for electrochemical biosensor accuracy. |
| 200kHz unity-gain bandwidth | Provides adequate phase margin for stable operation with 15pF capacitive loads - eliminates need for external compensation in most PCB traces. |
| Specified over –40°C to +85°C | Validated performance across industrial and medical ambient conditions - no derating required for portable outdoor or body-worn use. |
Applications
| Portable Medical Devices | Portable Test Equipment |
|---|---|
Use Scenario: Signal amplification in three-electrode glucose meters, where RE and WE currents are conditioned before ADC sampling. IC Role / Device Role / Timing Role: Dual-channel precision op amp providing matched gain and offset for reference and working electrode paths. Use Value: 1pA input bias current prevents polarization errors in low-current (<100nA) amperometric measurements, ensuring clinical-grade accuracy. |
Use Scenario: Front-end amplification in handheld multimeters and portable oscilloscope probes for DC/low-frequency signals. IC Role / Device Role / Timing Role: Dual op amp configured as precision buffer and programmable gain stage for auto-ranging input circuits. Use Value: Rail-to-rail I/O swing preserves full 1.8V–5.5V supply headroom, enabling >12-bit effective resolution without external level shifters. |
| Laptops | Data-Acquisition Equipment |
Use Scenario: Battery voltage monitoring and thermal sensor signal conditioning in ultrabook power management subsystems. IC Role / Device Role / Timing Role: Low-quiescent dual op amp amplifying thermistor and battery divider outputs for system controller ADC inputs. Use Value: 4µA per amplifier minimizes impact on standby current budget - critical for >10-day suspend-to-RAM battery life targets. |
Use Scenario: Sensor signal conditioning in modular DAQ modules used in field-deployable environmental monitoring systems. IC Role / Device Role / Timing Role: Dual-channel op amp driving multiplexed analog inputs to SAR ADCs with minimal settling time penalty. Use Value: 200kHz GBW ensures <1µs settling to 0.1% for 10-bit conversions, supporting >100ksps aggregate sampling rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual, rail-to-rail, low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4477AUA+ | Higher 10µA supply current, 3MHz GBW, ±125µV offset - trades power for speed and precision. | Better suited for higher-bandwidth sensor interfaces (>100kHz), less optimal for multi-year battery life. | Select when >100kHz closed-loop bandwidth or sub-100µV offset is required; avoid if quiescent current <5µA is mandatory. |
| TLV2462IDR | 600nA input bias current (vs. 1pA), 650kHz GBW, 2.7V–6V supply - lower cost but higher input error at high source impedances. | Acceptable for general-purpose portable instrumentation where sensor Z < 1MΩ; unsuitable for picoampere-level biosensing. | Choose for cost-sensitive, non-medical applications with moderate impedance sources; verify offset drift over temperature. |
Compared with MAX4477AUA+ and TLV2462IDR, the MAX9912EUA+ uniquely balances ultra-low input bias current (1pA), sub-5µA quiescent current, and 200kHz bandwidth - making it the only option among the three qualified for long-life, high-impedance electrochemical sensing without external guarding or compensation.
Availability
The MAX9912EUA+ is available at Aetrix Electronics and suitable for portable medical devices, portable test equipment, and data-acquisition equipment requiring stable component supply and guaranteed long-term manufacturability.
Supply support for MAX9912EUA+ 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 communications applications.
The MAX9910–MAX9913 family was engineered specifically for ultra-low-power, rail-to-rail signal conditioning in battery-operated portable instrumentation - emphasizing input bias current, supply efficiency, and wide-voltage compatibility over raw speed.
FAQ
Does the MAX9912EUA+ include a shutdown feature?
No, the MAX9912EUA+ does not incorporate a shutdown function. Unlike the MAX9911/MAX9913 variants, it lacks SHDN pins and remains fully active whenever powered. This design choice prioritizes continuous signal fidelity and eliminates wake-up latency, making MAX9912EUA+ ideal for always-on sensor front-ends where power gating is unnecessary or undesirable.
What is the maximum capacitive load the MAX9912EUA+ can drive stably?
The MAX9912EUA+ is unity-gain stable with capacitive loads up to 30pF. When configured for a minimum gain of 10V/V, it supports loads up to 250pF. For loads exceeding 30pF in unity-gain configurations, an isolation resistor (e.g., 6.2kΩ) between output and load is required to maintain stability - as confirmed in the device's driving capacitive loads section.
Can the MAX9912EUA+ operate from a 1.8V supply while maintaining rail-to-rail output swing?
Yes, the MAX9912EUA+ guarantees rail-to-rail output swing down to 1.8V supply, delivering output voltage within 5mV of VSS and VDD when loaded with 100kΩ. At 1.8V, the output swing remains usable across the full range, enabling direct interface with 1.8V ADC references without level-shifting circuitry - a key advantage for ultra-low-voltage portable systems.
How does the channel-to-channel isolation of the MAX9912EUA+ affect dual-sensor applications?
The MAX9912EUA+ provides ≥100dB channel-to-channel isolation at DC, minimizing crosstalk between its two independent amplifiers. In dual-sensor applications - such as glucose meter reference/working electrode pairs - this ensures that signal coupling remains below –100dB, preserving measurement independence and eliminating correlated offset errors during simultaneous acquisition.
Is the MAX9912EUA+ pin-compatible with other devices in the MAX9910–MAX9913 family?
No, the MAX9912EUA+ is not pin-compatible with other members of the MAX9910–MAX9913 family. It uses an 8-pin SOT23 package with dedicated dual-channel pins (e.g., INA+, INB−, OUTA, OUTB), whereas MAX9910 (5-pin SC70) and MAX9911 (6-pin SC70/WLP) have single-amplifier footprints, and MAX9913 (10-pin µMAX) adds separate shutdown pins. PCB layout must be designed specifically for the MAX9912EUA+ 8-pin SOT23 footprint.
MAX9912EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.1V/µs
- Gain Bandwidth Product:
- 200 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 7µA (x2 Channels)
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX9912EUA+ FAQ
1.How can I place an order for MAX9912EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9912EUA+ 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 MAX9912EUA+ reliable?
The price and inventory of MAX9912EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9912EUA+ is usually 5 days.
3.What payment methods are accepted for MAX9912EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9912EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9912EUA+?
MAX9912EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9912EUA+ 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 MAX9912EUA+?
For technical support, including MAX9912EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9912EUA+ requirements.
6.How does Aetrix verify that MAX9912EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX9912EUA+ 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 MAX9912EUA+ meets industry standards.
7.What is the process for return or replacement of MAX9912EUA+?
All MAX9912EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9912EUA+, 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 MAX9912EUA+ part is unused and in its original packaging.
Return procedure for MAX9912EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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