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Analog Devices Inc./Maxim Integrated MAX4238ASA+
- Part No.:
- MAX4238ASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4238ASA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:370
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Product details
Overview
MAX4238ASA+ from Maxim Integrated is a unity-gain stable, ultra-high-precision operational amplifier featuring 0.1µV typical input offset voltage, 10nV/°C max drift over –40°C to +125°C, and 1MHz gain-bandwidth product. It operates from a single 2.7V to 5.5V supply, draws only 600µA quiescent current, and delivers rail-to-rail output swing into 1kΩ - ideal for thermocouple and strain gauge signal conditioning in industrial sensor front-ends.
For engineers reviewing the MAX4238ASA+ datasheet, MAX4238ASA+ pinout, MAX4238ASA+ application, or MAX4238ASA+ equivalent, key selection criteria include its near-zero DC offset stability over temperature, 1.5µVP-P (0.01Hz–10Hz) low-frequency noise, shutdown capability (0.1µA), and SO-8 package compatibility with precision instrumentation PCB layouts.
Technical Context
The MAX4238ASA+ employs patented autocorrelating zeroing architecture to continuously measure and cancel input offset and 1/f noise - eliminating drift across time and temperature without chopper-induced intermodulation distortion. Its pseudorandom autozero clock (10kHz–15kHz) minimizes spectral artifacts while maintaining DC accuracy.
This amplifier supports ground-sensing inputs and rail-to-rail outputs, enabling full dynamic range utilization in single-supply systems. It achieves 150dB open-loop gain, 140dB PSRR and CMRR at +25°C, and maintains ≥95dB AVOL and ≥90dB CMRR across –40°C to +125°C - critical for high-resolution ADC buffering in automotive and medical applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 0.1µV typ, ≤2.5µV max (–40°C to +85°C); enables sub-16-bit system accuracy without calibration |
| Offset Drift | ≤10nV/°C; contributes ≤100nV error over 10°C ambient shift - critical for uncalibrated sensor interfaces |
| Gain-Bandwidth Product | 1MHz; supports stable unity-gain operation with ≤1µs settling to 0.0015% (16-bit) for low-speed precision acquisition |
| Supply Current | 600µA typ (VCC = 5.5V); allows battery-powered instrumentation with >1-year runtime on coin cell |
| Shutdown Current | 0.1µA max; reduces system standby power by >99.9% during idle cycles |
| Input Noise (0.01–10Hz) | 1.5µVP-P; preserves signal integrity in µV-level thermocouple and bridge sensor outputs |
| CMRR / PSRR | 140dB min at +25°C; rejects common-mode interference from noisy industrial power rails and digital switching |
Pinout & Package
MAX4238ASA+ is housed in an 8-pin narrow SO (SO-8) package (package code S8+4/S8-4), with exposed pad not present. Thermal resistance θJA is 132°C/W on multilayer board - suitable for compact PCBs with moderate power dissipation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No internal connection; must be left floating or tied to GND per layout best practice |
| 2 | OUT | Amplifier output; rail-to-rail swing supports full-scale ADC input without level-shifting |
| 3 | IN+ | Noninverting input; ground-sensing capability enables direct connection to low-side shunt or bridge sensors |
| 4 | IN− | Inverting input; matched input bias current (1pA) minimizes offset error from source impedance imbalance |
| 5 | SHDN | Active-low shutdown control; pulls low to enter 0.1µA sleep mode; tie to VCC for normal operation |
| 6 | VCC | Positive supply pin; accepts 2.7V–5.5V single supply; PSRR ≥120dB ensures immunity to supply ripple |
| 7 | N.C. | No internal connection; electrically isolated - no routing or stitching required |
| 8 | GND | Analog ground reference; separate AGND path recommended to avoid digital noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Autocorrelating Zeroing Architecture | Eliminates 1/f noise and long-term drift without chopper artifacts - verified by <1.5µVP-P noise floor |
| Rail-to-Rail Output Stage | Swings within 35mV of rails into 1kΩ load - maximizes dynamic range for 16-bit SAR ADCs |
| Ground-Sensing Input | Accepts common-mode voltages down to –0.1V - enables direct interface with low-side current sense resistors |
| Low-Power Shutdown Mode | Reduces ICC to 0.1µA while placing output in high-Z state - preserves system isolation during sleep |
| High DC Precision | 150dB AVOL, 140dB CMRR/PSRR - ensures <0.001% gain error in closed-loop configurations |
Applications
| Thermocouple Signal Conditioning | Strain Gauge Instrumentation |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltage from K-type thermocouples across –40°C to +125°C industrial environments. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with zero-drift correction, directly driving 16-bit sigma-delta ADC. Use Value: Eliminates need for external cold-junction compensation or periodic recalibration due to ≤2.5µV total offset error over full temperature range. |
Use Scenario: Buffering mV-level differential output from 350Ω foil strain gauges in load cells and pressure transducers. IC Role / Device Role / Timing Role: Low-noise, high-CMRR instrumentation amplifier front-end with 1.5µVP-P noise floor below 10Hz. Use Value: Enables 1:100,000 dynamic range (16-bit ENOB) without averaging - critical for high-accuracy weighing systems. |
| Medical ECG Front-End | Automotive Battery Monitoring |
|
Use Scenario: Amplifying 0.5–2mV cardiac signals in portable ECG devices with strict low-power requirements. IC Role / Device Role / Timing Role: Ultra-low-offset, low-noise buffer before programmable gain amplifier and anti-alias filter. Use Value: 10nV/°C drift ensures baseline stability over patient body temperature shifts - avoids false arrhythmia detection. |
Use Scenario: Measuring cell voltage differentials (<10mV) in 12V lead-acid or Li-ion battery packs under engine cranking noise. IC Role / Device Role / Timing Role: High-PSRR (140dB), high-CMRR (140dB) differential amplifier rejecting alternator ripple and ignition transients. Use Value: Maintains ±50µV measurement accuracy despite 100mVpp supply rail noise - essential for SOC estimation fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA189IDBVR | Zero-drift, 0.005µV/°C drift, 1.8MHz GBW, but higher 650µA supply current and no shutdown pin | Lacks active shutdown; requires external enable logic for power cycling - increases BOM count | Choose when ultra-low drift (<5nV/°C) outweighs shutdown necessity and board space constraints |
| LTC2057HMS8#PBF | Chopper-stabilized, 0.25µV max offset, 2MHz GBW, 1.1mA supply current, no integrated shutdown | Higher noise (2.5µVP-P) and chopper ripple require additional filtering - adds latency and component cost | Prefer when maximum bandwidth (2MHz) is prioritized over lowest possible noise and power |
Compared with OPA189IDBVR and LTC2057HMS8#PBF, MAX4238ASA+ uniquely combines sub-2.5µV total offset, 0.1µA shutdown, rail-to-rail output, and SO-8 footprint - making it optimal for space-constrained, battery-aware precision sensor nodes requiring zero calibration maintenance.
Availability
MAX4238ASA+ is available at Aetrix Electronics and suitable for thermocouple interfaces, strain gauge instrumentation, and medical ECG front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4238ASA+ 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 - with emphasis on reliability and integration for harsh-environment systems.
The MAX4238 series targets ultra-precision DC signal chains in sensor interfaces, where near-zero offset, minimal drift, and low 1/f noise are mandatory - especially in automotive, industrial, and medical instrumentation.
FAQ
What is the maximum operating temperature range for MAX4238ASA+?
The MAX4238ASA+ is fully specified from –40°C to +125°C ambient temperature, with junction temperature rated up to +150°C. Its offset voltage remains ≤3.5µV across this full range, and CMRR stays ≥90dB at +125°C - ensuring reliable performance in under-hood automotive or industrial control cabinet deployments where thermal stress is severe.
Does MAX4238ASA+ support rail-to-rail input operation?
No, MAX4238ASA+ does not support rail-to-rail input. Its common-mode input voltage range extends from (VGND – 0.05V) to (VCC – 1.4V), enabling ground-sensing capability down to –0.05V but limiting high-side input to ~1.4V below VCC. This design prioritizes ultra-low offset and drift over full input swing - appropriate for sensor interfaces where signals remain near ground.
Can MAX4238ASA+ drive a 10kΩ load with rail-to-rail output swing?
Yes, MAX4238ASA+ delivers rail-to-rail output swing into 10kΩ loads: VOH ≤ VCC – 4mV and VOL ≤ 4mV at +25°C. This meets the stringent headroom requirements of high-resolution SAR and sigma-delta ADCs, preserving full-scale dynamic range without external level-shifting circuitry - a key advantage over many competing precision op-amps.
Is MAX4238ASA+ pin-compatible with other SO-8 precision op-amps like OP07 or AD8628?
No, MAX4238ASA+ is not pin-compatible with OP07 or AD8628. Its SO-8 pinout places SHDN on Pin 5 and uses Pins 1 and 7 as N.C., whereas OP07 assigns Pin 1 to offset null and AD8628 uses Pin 1 for trim. Direct replacement would require PCB redesign - confirm pin mapping before migration.
How does the autocorrelating zeroing technique in MAX4238ASA+ differ from traditional chopper stabilization?
MAX4238ASA+ uses a pseudorandom autozero clock (10–15kHz) instead of fixed-frequency chopping, eliminating intermodulation distortion and discrete spectral tones that plague chopper amplifiers. This results in cleaner 1.5µVP-P noise in the 0.01–10Hz band - verified in its typical operating characteristics - while achieving identical DC precision without post-processing filters.
MAX4238ASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 0.35V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 0.1 µV
- Current - Supply:
- 600µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4238ASA+ FAQ
1.How can I place an order for MAX4238ASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4238ASA+ 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 MAX4238ASA+ reliable?
The price and inventory of MAX4238ASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4238ASA+ is usually 5 days.
3.What payment methods are accepted for MAX4238ASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4238ASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4238ASA+?
MAX4238ASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4238ASA+ 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 MAX4238ASA+?
For technical support, including MAX4238ASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4238ASA+ requirements.
6.How does Aetrix verify that MAX4238ASA+ is sourced from the original manufacturer or authorized distributors?
All MAX4238ASA+ 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 MAX4238ASA+ meets industry standards.
7.What is the process for return or replacement of MAX4238ASA+?
All MAX4238ASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4238ASA+, 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 MAX4238ASA+ part is unused and in its original packaging.
Return procedure for MAX4238ASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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