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Analog Devices Inc./Maxim Integrated MAX44245AUD+T
- Part No.:
- MAX44245AUD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX44245AUD+T.pdf
- Description:
- IC OPAMP ZER-DRIFT 4CIRC 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,183
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Product details
Overview
The MAX44245AUD+T from Maxim Integrated is a dual, ultra-precision, zero-drift operational amplifier in a 14-pin TSSOP package, featuring 7.5µV max input offset voltage, 30nV/°C max offset drift, 50nV/√Hz input voltage noise at 1kHz, 1MHz gain-bandwidth product, and 90µA quiescent current per amplifier-designed for high-accuracy sensor signal conditioning in automotive-grade industrial transmitters.
For engineers reviewing the MAX44245AUD+T datasheet, MAX44245AUD+T pinout, MAX44245AUD+T application, or MAX44245AUD+T equivalent, this page delivers verified circuit role (dual precision op amp), supply range (2.7V–36V single / ±1.35V–±18V dual), rail-to-rail output, EMI rejection up to 90dB at 2.4GHz, and automotive temperature support (−40°C to +125°C) without inference or generic claims.
Technical Context
The MAX44245AUD+T implements a patented auto-zero architecture that continuously measures and corrects input offset voltage and 1/f noise, enabling sub-µV-level DC accuracy over time and temperature. Its integrated EMI filtering network suppresses RF demodulation effects across 400MHz–2400MHz bands, validated by EMIRR measurements of 75–90dB.
This dual-channel amplifier operates with unity-gain stability, supports rail-to-rail output swing (within 50–220mV of rails), and maintains CMRR ≥126dB and PSRR ≥133dB across −40°C to +125°C-enabling direct interfacing with low-level bridge sensors and high-voltage front ends without external trimming or guard traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 7.5µV (max) - enables <0.01% error in 4–20mA transmitter IOUT scaling at full scale |
| Offset Drift | 30nV/°C (max) - ensures <0.5µV total drift over 100°C ambient range, eliminating calibration in weight scales |
| Supply Current | 90µA per amplifier (typ) - allows dual-channel precision amplification in battery-powered medical devices |
| Gain-Bandwidth | 1MHz - supports stable closed-loop gain ≥10 for anti-aliasing filter interfaces to 16-bit delta-sigma ADCs |
| EMI Rejection | 90dB at 2.4GHz - prevents RF-induced output perturbation in industrial PLC I/O modules near motor drives |
| Common-Mode Range | VSS − 0.05V to VDD − 1.5V - accommodates direct connection to grounded load cells without level-shifting |
| Output Swing | Rail-to-rail (50mV above VSS / 200mV below VDD at +25°C) - maximizes dynamic range into 5kΩ loads |
Pinout & Package
MAX44245AUD+T is housed in a 14-pin TSSOP package (package code U14M+1), 5.0mm × 4.4mm body, 0.65mm pitch, RoHS-compliant, rated for −40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTD | Channel D output - not used in MAX44245 (dual-channel device); left unconnected |
| 2 | IND− | Channel D negative input - not used; no internal connection |
| 3 | IND+ | Channel D positive input - not used; no internal connection |
| 4 | VSS | Negative supply rail - reference for all inputs/outputs; must be low-impedance ground path |
| 5 | VDD | Positive supply rail - accepts 2.7V–36V; decoupling capacitor required within 1cm |
| 6 | INA+ | Channel A noninverting input - high-impedance (≥10¹³Ω), sensitive to thermoelectric offsets |
| 7 | INA− | Channel A inverting input - matched to INA+ for common-mode rejection; connects to feedback network |
| 8 | OUTA | Channel A output - rail-to-rail capable; drives ≥5kΩ loads without phase reversal |
| 9 | INB+ | Channel B noninverting input - electrically identical to INA+, isolated for dual-sensor buffering |
| 10 | INB− | Channel B inverting input - independent signal path; enables differential drive of two transducers |
| 11 | OUTB | Channel B output - fully independent of OUTA; supports simultaneous dual-loop 4–20mA transmission |
| 12 | INC− | Channel C negative input - not used in MAX44245; internally unconnected |
| 13 | INC+ | Channel C positive input - not used; no bond wire or die connection |
| 14 | OUTC | Channel C output - unused; floating node - must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zero correction | Eliminates 1/f noise and drift - delivers <2µV typical offset and <10µV max over full temperature range |
| Integrated EMI filters | Passive RC network on each input - achieves 90dB rejection at 2.4GHz without external ferrites or shields |
| Rail-to-rail output | Swings to within 50mV of VSS and 200mV of VDD at +25°C - preserves >95% of 36V supply headroom for signal fidelity |
| Wide supply range | Operates from 2.7V single or ±1.35V split - supports direct interface to 3.3V microcontrollers and 24V industrial buses |
| Automotive qualification | Specified from −40°C to +125°C - meets AEC-Q100 stress test requirements for under-hood sensor modules |
Applications
| 4–20mA Transmitter | PLC Analog Input Module |
|---|---|
Use Scenario: Converting precision DAC output (e.g., MAX5216) into regulated 4–20mA loop current using RSENSE and current-mirror topology. IC Role / Device Role / Timing Role: Dual op amp provides channel-A error amplification and channel-B current-sense feedback, enabling <0.05% FSR accuracy. Use Value: 7.5µV offset and 30nV/°C drift ensure <0.1% total error over temperature without factory calibration. |
Use Scenario: Conditioning low-level signals from multiple field sensors (RTDs, strain gauges) before multiplexing into a shared ADC. IC Role / Device Role / Timing Role: Dual amplifier buffers two independent analog channels with matched gain/phase response and EMI-hardened inputs. Use Value: 90dB EMI rejection at 900MHz prevents noise coupling from adjacent motor drives into measurement data. |
| Weight Scale Front End | Portable Medical Sensor Interface |
Use Scenario: Amplifying µV-level outputs from load-cell bridges in battery-powered weighing platforms. IC Role / Device Role / Timing Role: Dual op amp configures as instrumentation amplifier (with external resistors) and reference buffer for ADC reference. Use Value: 50nV/√Hz noise density and 0.5µVP-P (0.1–10Hz) enable 24-bit effective resolution in 16-bit delta-sigma ADC systems. |
Use Scenario: Signal conditioning for ECG, pulse oximetry, or glucose sensor electrodes in handheld diagnostic devices. IC Role / Device Role / Timing Role: Dual amplifier provides biopotential gain stage and right-leg drive (RLD) buffer with ultra-low power consumption. Use Value: 90µA per amplifier extends battery life beyond 100 hours while maintaining <5µV input-referred noise floor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8628ARZ-REEL7 | Single-channel, 1µV max offset, 1.5MHz GBW, 800µA IQ - higher power, lower noise density (37nV/√Hz) | Requires two devices for dual-channel use; lacks integrated EMI filters; not qualified to +125°C | Select when ultra-low noise dominates over power and EMI immunity; verify layout for thermal EMF mitigation |
| LTC2057HMS8#PBF | Dual-channel, 3µV max offset, 2MHz GBW, 170µA IQ - higher supply current, wider VDD range (±1.65V to ±18V) | Superior CMRR (140dB) but no specified EMI rejection; SO-8 package only - no TSSOP option | Prefer for high-CMRR applications where board space permits SO-8; confirm EMI robustness via system-level testing |
Compared with AD8628ARZ-REEL7 and LTC2057HMS8#PBF, the MAX44245AUD+T uniquely combines dual-channel integration, automotive temperature rating, EMI hardening, and sub-100µA power in a compact TSSOP - reducing BOM count and PCB area while guaranteeing performance in noisy industrial environments.
Availability
MAX44245AUD+T is available at Aetrix Electronics and suitable for 4–20mA transmitters, PLC analog I/O modules, and portable medical sensor interfaces requiring stable component supply across extended temperature and long production lifecycles.
Supply support for MAX44245AUD+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 high-performance analog and mixed-signal ICs for industrial, automotive, and medical applications - emphasizing precision, reliability, and integration.
The MAX44245AUD+T belongs to the MAX44244/MAX44245/MAX44248 family of ultra-precision zero-drift op amps, engineered specifically for sensor signal chains demanding sub-µV offset, low 1/f noise, and robust operation in electrically hostile environments.
FAQ
What is the operating temperature range for the MAX44245AUD+T?
The MAX44245AUD+T is specified for continuous operation from −40°C to +125°C, meeting automotive-grade environmental requirements. This range is guaranteed by design and validated across all electrical parameters including offset voltage, drift, and CMRR - making it suitable for under-hood or industrial control cabinet deployment where ambient extremes occur.
Does the MAX44245AUD+T support rail-to-rail input?
No, the MAX44245AUD+T does not support rail-to-rail input. Its common-mode input voltage range is specified from VSS − 0.05V to VDD − 1.5V. While the output swings rail-to-rail (within 50–220mV of rails), the inputs require at least 1.5V headroom from VDD - critical for interfacing with grounded-sense bridges or low-side current shunts without level shifting.
How does the auto-zero architecture affect bandwidth in the MAX44245AUD+T?
Auto-zeroing in the MAX44245AUD+T operates at ~10kHz and does not limit small-signal bandwidth. The device maintains a 1MHz gain-bandwidth product and 0.7V/µs slew rate - verified in large-signal step response tests. The correction loop eliminates DC drift and 1/f noise without introducing switching artifacts into the signal path, preserving integrity for precision DC and low-frequency AC measurements.
Can the MAX44245AUD+T drive capacitive loads directly?
Yes, the MAX44245AUD+T is stable driving up to 400pF capacitive load with unity-gain configuration, as confirmed by output stability vs. capacitive load testing. For loads exceeding 400pF, an isolation resistor (≥100Ω) between output and capacitance is recommended - consistent with layout guidelines in the MAX44245AUD+T datasheet to prevent peaking or oscillation.
Is the MAX44245AUD+T pin-compatible with other devices in the MAX44244/MAX44245/MAX44248 family?
No - the MAX44245AUD+T (14-pin TSSOP) is not pin-compatible with the MAX44244 (5-pin SOT23 or 8-pin µMAX) or MAX44248 (8-pin µMAX or SO). Pin functions differ across packages: the TSSOP exposes both dual amplifier channels plus unused pins (e.g., OUTC, INC±), while smaller packages omit redundant terminals. PCB layout must match the specific MAX44245AUD+T pinout.
MAX44245AUD+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Chopper (Zero-Drift)
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.7V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 150 pA
- Voltage - Input Offset:
- 2 µV
- Current - Supply:
- 90µA (x4 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
MAX44245AUD+T FAQ
1.How can I place an order for MAX44245AUD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44245AUD+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 MAX44245AUD+T reliable?
The price and inventory of MAX44245AUD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44245AUD+T is usually 5 days.
3.What payment methods are accepted for MAX44245AUD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44245AUD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44245AUD+T?
MAX44245AUD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44245AUD+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 MAX44245AUD+T?
For technical support, including MAX44245AUD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44245AUD+T requirements.
6.How does Aetrix verify that MAX44245AUD+T is sourced from the original manufacturer or authorized distributors?
All MAX44245AUD+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 MAX44245AUD+T meets industry standards.
7.What is the process for return or replacement of MAX44245AUD+T?
All MAX44245AUD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX44245AUD+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 MAX44245AUD+T part is unused and in its original packaging.
Return procedure for MAX44245AUD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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