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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:1,502
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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, 1MHz gain-bandwidth product, rail-to-rail output, and 600µA supply current. It operates from a single 2.7V to 5.5V supply and targets high-accuracy sensor signal conditioning in thermocouple and strain gauge interfaces.
For engineers reviewing the MAX4238ASA datasheet, MAX4238ASA pinout, MAX4238ASA application, or MAX4238ASA equivalent, key selection criteria include its guaranteed ≤2.5µV offset over –40°C to +85°C, 1.5µVP-P (0.01Hz–10Hz) noise, shutdown current of 0.1µA, and SO-8 package compatibility with precision instrumentation PCB layouts.
Technical Context
The MAX4238ASA employs patented autocorrelating zeroing architecture that continuously samples and cancels input offset and 1/f noise-enabling near-zero DC error without chopper-induced intermodulation distortion. Its pseudorandom autozero clock (10kHz–15kHz) minimizes spectral artifacts while maintaining stability at unity gain.
This architecture delivers 150dB open-loop gain (AVOL), 140dB CMRR and PSRR, and ground-sensing inputs compatible with low-side current sensing. The device supports rail-to-rail output swing into 1kΩ loads and features an active-low SHDN pin that places the output in high-impedance state with 0.1µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 0.1µV typ, ≤2.5µV over –40°C to +85°C - enables sub-16-bit accuracy without calibration in DC-coupled sensor front-ends. |
| Offset Drift | 10nV/°C max - ensures <100nV drift over 10°C ambient change, critical for uncalibrated industrial temperature measurement. |
| Gain-Bandwidth Product | 1MHz - supports stable unity-gain operation and closed-loop gains up to 1000V/V for precision amplification of low-frequency sensor signals. |
| Supply Current | 600µA typ at 5.5V - allows battery-powered instrumentation with >1-year runtime on coin-cell sources when paired with shutdown mode. |
| Output Swing | Rail-to-rail into 1kΩ load (VOL ≤50mV, VOH ≥VCC–50mV) - maximizes dynamic range for ADCs operating on 3.3V or lower supplies. |
| Shutdown Current | 0.1µA - reduces system standby power by >99.9% versus active mode, essential for always-on sensor nodes. |
| Input Noise (0.01–10Hz) | 1.5µVP-P - preserves resolution in thermocouple and bridge-based measurements where signal bandwidth is <10Hz. |
Pinout & Package
MAX4238ASA is packaged in an 8-pin narrow SO (SO-8) with exposed pad option not applicable. Pin 1 is OUT; Pin 2 is GND; Pin 3 is IN+; Pin 4 is IN–; Pin 5 is SHDN (active-low); Pin 6 is VCC; Pins 7 and 8 are No Connect (N.C.). The N.C. pins are not internally bonded and must remain unconnected per design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Delivers rail-to-rail buffered signal; drives ADC inputs or downstream stages with 40mA short-circuit capability. |
| 2 (GND) | Analog Ground Reference | Primary return path for input bias currents and output load; must be tied to clean analog ground plane. |
| 3 (IN+) | Noninverting Input | High-impedance (1pA bias current) node for reference or sensor-positive connection; supports ground-sensing configurations. |
| 4 (IN–) | Inverting Input | High-impedance feedback node; charge injection minimized via internal design to preserve low-offset integrity. |
| 5 (SHDN) | Active-Low Shutdown Control | Pull low to disable amplifier and reduce ICC to 0.1µA; pull high to VCC for normal operation; no external pull-up required. |
| 6 (VCC) | Positive Supply Rail | Accepts 2.7V–5.5V single supply; PSRR of 140dB suppresses supply ripple from affecting precision output. |
| 7, 8 (N.C.) | No Connection | Not internally connected; must be left floating or tied to GND for mechanical stability-no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Autocorrelating Zeroing Architecture | Eliminates 1/f noise and long-term drift without chopper artifacts-enables true DC precision in static sensor measurements. |
| Rail-to-Rail Output Stage | Swings within 35mV of rails into 1kΩ, preserving full-scale ADC utilization across 2.7V–5.5V supplies. |
| Ground-Sensing Input Range | Accepts common-mode voltages down to VGND – 0.05V, enabling direct interface with low-side shunt current monitors. |
| 140dB CMRR & PSRR | Rejects interference from noisy digital supplies and ground shifts-critical for mixed-signal PCBs with shared power domains. |
| 0.1µA Shutdown Mode | Reduces total system standby power to nanoampere levels, supporting energy harvesting and battery longevity requirements. |
Applications
| Thermocouple Signal Conditioning | Strain Gauge Bridge Amplification |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltage from K-type thermocouples across –40°C to +85°C industrial environments. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier stage with integrated offset cancellation and 1/f noise suppression. Use Value: Enables <±0.5°C accuracy without cold-junction compensation or periodic recalibration due to ≤2.5µV offset and 10nV/°C drift. |
Use Scenario: Conditioning mV-level differential output from 350Ω Wheatstone bridges in load cells and pressure sensors. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage preceding 24-bit sigma-delta ADCs in electronic scales and test equipment. Use Value: Delivers 1.5µVP-P (0.01–10Hz) noise floor and rail-to-rail output to maximize effective resolution of 24-bit converters. |
| Medical ECG Front-End | Automotive Cabin Temperature Monitoring |
|
Use Scenario: Buffering and amplifying low-amplitude, low-frequency bio-potential signals in portable ECG devices. IC Role / Device Role / Timing Role: High-CMRR, low-input-bias-current amplifier providing DC-stable gain before anti-alias filtering and digitization. Use Value: 1pA input bias current prevents electrode polarization errors; 140dB CMRR rejects 50/60Hz mains interference without guard traces. |
Use Scenario: Reading NTC thermistors in automotive HVAC control modules across –40°C to +125°C under hood conditions. IC Role / Device Role / Timing Role: Precision voltage follower or fixed-gain amplifier interfacing with microcontroller ADCs in AEC-Q100-compliant systems. Use Value: Guaranteed ≤3.5µV offset over full –40°C to +125°C range ensures <0.1°C thermal resolution without software correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | Zero-drift architecture with 5.2MHz GBWP, 200nV offset, but requires dual supply or level-shifting for single-supply rail-to-rail output. | Better bandwidth for higher-speed precision acquisition; less suitable for ultra-low-power battery operation (650µA vs. 600µA). | Select OPA2189IDR when >1MHz closed-loop bandwidth is needed and dual-supply or level-shift tolerance exists. |
| LTC2057HS8#PBF | Chopper-stabilized op-amp with 0.5µV offset, 2MHz GBWP, but exhibits higher 1/f noise residuals and 100kHz switching artifacts. | Higher EMI susceptibility (EMIRR = 80dB vs. MAX4238ASA's 120dB); less robust in noisy automotive or industrial settings. | Select LTC2057HS8#PBF only if cost sensitivity outweighs EMI immunity and ultra-low 0.01–10Hz noise requirements. |
Compared with OPA2189IDR and LTC2057HS8#PBF, the MAX4238ASA uniquely combines unity-gain stability, 1.5µVP-P ultra-low-frequency noise, 120dB EMIRR, and 0.1µA shutdown-making it optimal for battery-powered, noise-sensitive, DC-precision applications where layout space and supply simplicity are constrained.
Availability
MAX4238ASA is available at Aetrix Electronics and suitable for thermocouple interfaces, strain gauge amplifiers, and medical instrumentation requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant variants (e.g., MAX4238AUT/V+).
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, mixed-signal, and RF ICs for industrial, automotive, communications, and computing markets.
The MAX4238/MAX4239 family was engineered specifically for ultra-high-precision DC signal conditioning-targeting applications where offset, drift, and 1/f noise dominate error budgets in sensor front-ends.
FAQ
What is the maximum operating temperature range for the MAX4238ASA?
The MAX4238ASA is fully specified from –40°C to +125°C ambient temperature, with junction temperature rated to +150°C. Electrical parameters including offset voltage (≤3.5µV), CMRR (≥90dB), and supply current (≤900µA) are guaranteed across this full range, making it suitable for under-hood automotive and industrial control applications.
Does the MAX4238ASA require external compensation capacitors for unity-gain stability?
No, the MAX4238ASA is internally compensated for unity-gain stability and does not require external compensation components. Its 1MHz gain-bandwidth product and phase margin exceed 60° at AV = 1V/V with RL = 10kΩ and CL = 100pF, as verified in the datasheet's gain/phase plots and stability testing.
How does the MAX4238ASA's autocorrelating zeroing differ from conventional chopper stabilization?
The MAX4238ASA uses a pseudorandom autozero clock (10–15kHz) instead of fixed-frequency chopping, eliminating intermodulation distortion and discrete spectral tones. This architecture cancels both input offset and 1/f noise without introducing switching artifacts-unlike chopper amplifiers that inject feedthrough at their clock frequency and harmonics.
Can the MAX4238ASA drive a 10kΩ load while maintaining rail-to-rail output swing?
Yes-the MAX4238ASA delivers rail-to-rail output swing into 10kΩ loads (VOL ≤10mV, VOH ≥VCC–10mV), and maintains >99% of full-scale swing even into 1kΩ (VOL ≤50mV, VOH ≥VCC–50mV). This performance is validated across supply voltages from 2.7V to 5.5V and temperatures from –40°C to +125°C.
Is the MAX4238ASA pin-compatible with other SO-8 precision op-amps like the OP07 or ADA4077?
No-MAX4238ASA has a unique pinout: Pin 1 = OUT, Pin 2 = GND, Pin 3 = IN+, Pin 4 = IN–, Pin 5 = SHDN, Pin 6 = VCC, Pins 7–8 = N.C. Standard SO-8 op-amps place VCC on Pin 7 or 8 and lack SHDN or N.C. pins. Direct replacement requires PCB layout revision and signal routing changes.
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:
- Obsolete
- 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:
- 40 mA
- 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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