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Analog Devices Inc./Maxim Integrated MAX44261AXT+T
- Part No.:
- MAX44261AXT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX44261AXT+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:985
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Product details
Overview
MAX44261AXT+T from Maxim Integrated is a precision, low-noise, rail-to-rail input/output operational amplifier with on-demand self-calibration of input offset voltage (VOS). It delivers 15MHz unity-gain bandwidth, 12.7nV/√Hz input voltage noise, and 750µA quiescent current per amplifier, operating from 1.8V to 5.5V over –40°C to +125°C. It is used as a high-fidelity ADC driver in portable medical instruments and battery-powered 12- to 14-bit SAR data acquisition systems.
For engineers reviewing the MAX44261AXT+T datasheet, MAX44261AXT+T pinout, MAX44261AXT+T application, or MAX44261AXT+T equivalent, key selection criteria include its calibrated VOS ≤ 100µV over full temperature range, ultra-low input bias current (≤0.5pA), SC70-6 package footprint, and active CAL pin enabling field recalibration without power cycle.
Technical Context
The MAX44261AXT+T employs an ultra-quiet integrated charge pump that generates an internal rail 1V above VDD, powering a PMOS input stage to eliminate crossover distortion across the full rail-to-rail common-mode range. This architecture enables distortion-free operation in noninverting configurations such as Sallen-Key filters.
Its on-demand calibration uses a dedicated active-low CAL pin: asserting CAL for ≥1µs initiates a 10ms self-trimming sequence that reduces VOS to ≤100µV over –40°C to +125°C while placing inputs/outputs in high-impedance state. Unlike the MAX44260, it does not support shutdown-only mode - CAL combines recalibration and shutdown functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 15MHz - supports stable gain-of-1 amplification up to 10kHz filter corner frequencies with <0.01% settling. |
| Input Voltage Noise Density | 12.7nV/√Hz at 10kHz - preserves SNR in 12–14-bit ADC driver applications with ≤2VP-P signals. |
| Input Offset Voltage (post-cal) | ≤100µV over –40°C to +125°C - ensures DC accuracy without external trimming in precision sensor interfaces. |
| Quiescent Current | 750µA per amplifier - enables >100-hour operation on coin-cell batteries in portable medical devices. |
| Rail-to-Rail I/O Range | VIN: (VSS – 0.1V) to (VDD + 0.1V); VOUT: within 50mV of rails - maximizes dynamic range in single-supply 1.8V–5.5V systems. |
| Supply Voltage Range | 1.8V to 5.5V (–40°C to +125°C) - interoperable with Li-ion, 3.3V logic, and 5V industrial rails without level-shifting. |
| Input Bias Current | ≤0.5pA at +25°C - minimizes voltage error when driving high-impedance sources like photodiodes or pH electrodes. |
Pinout & Package
MAX44261AXT+T is housed in a 6-pin SC70 package (2.0mm × 1.25mm, 0.5mm pitch), optimized for space-constrained portable designs. Thermal resistance θJA = 326.5°C/W enables operation at full rating up to +70°C ambient without derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN+ | Noninverting Input | High-impedance CMOS node; accepts signals from VSS – 0.1V to VDD + 0.1V with <0.5pA bias current. |
| 2: VSS | Negative Power Supply | Ground reference; requires 0.1µF ceramic bypass capacitor placed adjacent to pin. |
| 3: IN– | Inverting Input | Differential input paired with IN+; matched input capacitance (0.4pF) ensures balanced AC response. |
| 4: OUT | Amplifier Output | Capable of sourcing/sinking 50mA; drives 300pF capacitive loads stably without isolation resistor. |
| 5: CAL | Active-Low Calibration/Shutdown | Pulling low for ≥1µs triggers 10ms self-trim and places OUT/IN in high-Z; compatible with 1.8V GPIO. |
| 6: VDD | Positive Power Supply | Accepts 1.8V–5.5V; requires 0.1µF ceramic bypass capacitor; PSRR ≥82dB up to 10kHz. |
Key Features
| Feature | Design Value |
|---|---|
| On-Demand VOS Self-Calibration | Reduces input offset to ≤100µV over full temperature range via user-triggered 10ms trim, eliminating system-level DC drift compensation. |
| Ultra-Low Input Voltage Noise | 12.7nV/√Hz at 10kHz enables <100µV RMS noise contribution in 10kHz-bandwidth ADC drivers, preserving ENOB in 14-bit systems. |
| Charge-Pump Input Architecture | Eliminates crossover distortion across rail-to-rail input range, ensuring THD ≤–110dB in noninverting Sallen-Key filter configurations. |
| Sub-picoampere Input Bias Current | ≤0.5pA at +25°C allows direct interfacing with >1GΩ sensors (e.g., piezoresistive strain gauges, electrochemical cells) without guard traces. |
| Wide Single-Supply Operation | 1.8V minimum supply enables use with LiFePO4 and coin cells; 5.5V maximum supports legacy 5V industrial buses without regulators. |
Applications
| Portable Medical Instrumentation | Analog-to-Digital Converter Buffer |
|---|---|
Use Scenario: Signal conditioning for ECG front-end amplifiers in handheld patient monitors. IC Role / Device Role / Timing Role: Precision DC-coupled buffer between electrode interface and 14-bit SAR ADC, rejecting electrode half-cell potential drift. Use Value: On-demand CAL pin enables recalibration during device boot-up or after electrode replacement, maintaining ≤100µV offset without factory trim. | Use Scenario: Driving the MAX11645 12-bit, 94ksps ADC in battery-powered data loggers. IC Role / Device Role / Timing Role: Low-noise, fast-settling (1.7µs to 0.01%) driver ensuring full ADC resolution with minimal code spread. Use Value: 12.7nV/√Hz noise and 15MHz GBW limit quantization noise to <0.5 LSB at 12-bit, even with 2VP-P input signals. |
| Transimpedance Amplifier | 3G/4G Handset Sensor Interface |
Use Scenario: Converting photocurrent from low-light ambient light sensors in smartphones. IC Role / Device Role / Timing Role: High-gain (1MΩ–10MΩ) transimpedance amplifier with ultra-low input bias current to minimize dark-current error. Use Value: ≤0.5pA input bias current prevents >5mV output error in 10MΩ TIA configurations, critical for sub-lux detection. | Use Scenario: Conditioning signals from MEMS accelerometers and gyroscopes in mobile handsets. IC Role / Device Role / Timing Role: Rail-to-rail I/O amplifier operating from 1.8V supply, providing full-scale output swing into ADC reference buffers. Use Value: 50mV output headroom at 1.8V supply enables >95% utilization of 1.8V ADC input range, maximizing dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX44260AXT+ | Lacks CAL pin; includes SHDN pin instead. VOS uncalibrated (max 500µV over –40°C to +125°C). Same SC70-6 package and noise specs. | Suitable where power cycling suffices for VOS correction, but not for field recalibration during operation. | Select MAX44260AXT+ only if system-level calibration occurs at power-on and no runtime recalibration is required. |
| ADA4522-1ARMZ | Zero-drift architecture; 2.5µV max VOS, 5.8nV/√Hz noise, 2.7–36V supply. SOIC-8, larger footprint. Higher quiescent current (1.2mA). | Better DC precision for lab-grade instrumentation, but incompatible with space-constrained portable designs due to package size and supply range. | Choose ADA4522-1ARMZ only for mains-powered test equipment requiring sub-µV offset stability over time and temperature. |
Compared with MAX44260AXT+, the MAX44261AXT+ trades shutdown flexibility for guaranteed low VOS via runtime calibration; compared with ADA4522-1ARMZ, it sacrifices ultimate DC precision for ultra-low power, miniature packaging, and 1.8V operation - making it optimal for portable, battery-sensitive applications demanding recalibration agility.
Availability
MAX44261AXT+T is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-operated data loggers, and 3G/4G handset sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX44261AXT+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 portable applications.
The MAX442xx family targets low-power, high-accuracy signal conditioning in space- and energy-constrained systems - specifically engineered for ADC driving, transimpedance amplification, and sensor interfacing where rail-to-rail operation and calibrated DC performance are essential.
FAQ
What is the function of the CAL pin on the MAX44261AXT+T?
The CAL pin on the MAX44261AXT+T is an active-low input that initiates a 10ms self-calibration sequence to reduce input offset voltage (VOS) to ≤100µV over –40°C to +125°C. During calibration, the amplifier's inputs and output enter high-impedance state. The CAL pin also serves as a shutdown control: pulling it low disables the amplifier and reduces supply current to <1µA. This dual function eliminates the need for separate calibration and power-control circuitry in the MAX44261AXT+T design.
Does the MAX44261AXT+T require external components for its internal charge pump?
No, the MAX44261AXT+T requires no external components for its internal charge pump. The ultra-quiet charge pump is fully integrated and operates at a frequency well above the amplifier's 15MHz unity-gain bandwidth, making it transparent to system performance. It autonomously generates an internal voltage rail 1V above VDD to power the PMOS input stage, eliminating crossover distortion without external capacitors, resistors, or layout constraints - a key differentiator of the MAX44261AXT+T versus conventional rail-to-rail op amps.
What is the maximum capacitive load the MAX44261AXT+T can drive without instability?
The MAX44261AXT+T can drive up to 300pF of capacitive load without sustained oscillation, as verified in production testing and documented in the Electrical Characteristics table. Stability is maintained under all supply conditions (1.8V–5.5V) and temperatures (–40°C to +125°C). For loads exceeding 300pF, an isolation resistor (≥20Ω) between the MAX44261AXT+T output and the capacitive node is recommended to preserve phase margin - a requirement confirmed by the STABILITY vs. CAPACITIVE LOAD AND ISOLATION RESISTANCE plot (toc26) in the MAX44261AXT+T datasheet.
How does the MAX44261AXT+T achieve rail-to-rail input operation beyond the supply rails?
The MAX44261AXT+T achieves rail-to-rail input operation from (VSS – 0.1V) to (VDD + 0.1V) using its integrated charge pump, which creates an auxiliary voltage rail 1V above VDD. This elevated rail powers the PMOS differential pair in the input stage, allowing the inputs to accept common-mode voltages exceeding VDD by 100mV and falling below VSS by 100mV. This extended range is guaranteed across the full –40°C to +125°C temperature range and enables robust operation in single-supply systems where input signals may transiently exceed rails - a capability explicitly specified in the MAX44261AXT+T Absolute Maximum Ratings and DC Characteristics tables.
Can the MAX44261AXT+T be used with a 1.7V supply?
No, the MAX44261AXT+T is not rated for 1.7V operation. Its guaranteed supply range is 1.8V to 5.5V over the –40°C to +125°C temperature range. While the MAX44259/MAX44263 variants support 1.7V at 0°C to +70°C, the MAX44261AXT+T datasheet specifies 1.8V minimum across its entire qualified temperature range. Operating below 1.8V risks undefined behavior, including failure of the charge pump, loss of rail-to-rail input functionality, and invalid VOS calibration - all of which are outside the MAX44261AXT+T's characterized specifications.
MAX44261AXT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.3V/µs
- Gain Bandwidth Product:
- 15 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- -
- Current - Supply:
- 750µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX44261AXT+T FAQ
1.How can I place an order for MAX44261AXT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44261AXT+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 MAX44261AXT+T reliable?
The price and inventory of MAX44261AXT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44261AXT+T is usually 5 days.
3.What payment methods are accepted for MAX44261AXT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44261AXT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44261AXT+T?
MAX44261AXT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44261AXT+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 MAX44261AXT+T?
For technical support, including MAX44261AXT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44261AXT+T requirements.
6.How does Aetrix verify that MAX44261AXT+T is sourced from the original manufacturer or authorized distributors?
All MAX44261AXT+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 MAX44261AXT+T meets industry standards.
7.What is the process for return or replacement of MAX44261AXT+T?
All MAX44261AXT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX44261AXT+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 MAX44261AXT+T part is unused and in its original packaging.
Return procedure for MAX44261AXT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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