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Analog Devices Inc./Maxim Integrated MAX40089AUA+
- Part No.:
- MAX40089AUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX40089AUA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,176
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Product details
Overview
MAX40089AUA+ from Analog Devices is a dual-channel, decompensated, ultra-low-input-bias-current operational amplifier optimized for high-precision, low-noise transimpedance and sensor-signal-conditioning applications. It delivers 42MHz gain-bandwidth product (AV ≥ 5), 4.2nV/√Hz input voltage noise at 30kHz, 0.3pA typical input bias current, and rail-to-rail output swing with 1kΩ load - operating from 2.7V to 5.5V over –40°C to +125°C.
For engineers reviewing the MAX40089AUA+ datasheet, MAX40089AUA+ pinout, MAX40089AUA+ application, or MAX40089AUA+ equivalent, this page provides verified specifications, package mapping to µMAX-8, functional pin definitions, real-world use cases in pH probes and ADC buffering, and two validated alternative op amps with documented technical and application differences.
Technical Context
The MAX40089AUA+ belongs to the MAX40079/MAX40087/MAX40077/MAX40089/MAX40078 family of ultra-low-noise, low-input-bias-current amplifiers. It is specifically decompensated for stable operation only at closed-loop gains ≥ 5V/V, enabling 42MHz GBWP and 10V/µs slew rate - significantly higher than the unity-gain-stable variants (e.g., MAX40077 at 10MHz).
Its input stage features 1000GΩ input resistance and 7pF input capacitance, with ESD protection via 60Ω series resistors and back-to-back diodes. The µMAX-8 package supports ground-sensing operation (input common-mode range includes VSS) and rail-to-rail output swing within 80mV of supplies into 1kΩ, maintaining DC accuracy across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 42MHz minimum at AV ≥ 5 - enables high-speed closed-loop filtering and wideband signal conditioning without stability compromise. |
| Input Bias Current | 0.3pA typical - critical for preserving signal integrity when interfacing photodiodes, pH electrodes, or other >100MΩ sources. |
| Input Voltage Noise Density | 4.2nV/√Hz at 30kHz - ensures minimal added noise in precision analog front-ends for 16-bit ADCs and medical sensors. |
| Slew Rate | 10V/µs - supports fast settling of large-signal steps in DAC output amplification and active filter stages. |
| Supply Voltage Range | +2.7V to +5.5V single supply - compatible with modern low-voltage embedded systems and battery-powered instrumentation. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood, industrial control, and harsh-environment sensor nodes. |
| Total Harmonic Distortion + Noise | –106dB (108dB) at 1kHz, RL = 1kΩ, AV = +5 - preserves dynamic range in audio-grade and high-fidelity measurement paths. |
Pinout & Package
The MAX40089AUA+ is packaged in an 8-pin µMAX (U8+1) surface-mount package measuring 3.0mm × 3.0mm × 0.8mm, with exposed pad for thermal enhancement and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - rail-to-rail capable, drives loads down to 1kΩ while maintaining DC accuracy and low THD+N. |
| 2 | VSS | Negative power supply - connect to 0V in single-supply systems; input common-mode range extends below VSS by 0.1V. |
| 3 | INA+ | Non-inverting input, Channel A - high-impedance node (1000GΩ); sensitive to PCB leakage; requires guard ring in high-Z layouts. |
| 4 | INA− | Inverting input, Channel A - accepts feedback network; 7pF input capacitance necessitates feed-forward compensation (CZ) if RG||RF > 5kΩ. |
| 5 | INB+ | Non-inverting input, Channel B - electrically isolated from Channel A; supports independent dual-sensor conditioning. |
| 6 | INB− | Inverting input, Channel B - same noise and stability constraints as INA−; enables matched dual-TIA or differential buffer designs. |
| 7 | OUTB | Amplifier B output - identical AC/DC performance to OUTA; allows synchronous dual-channel signal processing without inter-channel crosstalk degradation. |
| 8 | VDD | Positive power supply - supplies both channels; PSRR ≥ 90dB DC ensures immunity to supply ripple in mixed-signal systems. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 80mV of VDD/VSS into 1kΩ - maximizes dynamic range in 3.3V or lower supply systems without level-shifting circuitry. |
| Ultra-low input current noise | 0.5fA/√Hz - minimizes Johnson-Nyquist noise contribution when amplifying femtoamp-level currents from photodiodes or ion-selective electrodes. |
| Stable capacitive load drive | Up to 200pF without oscillation - eliminates need for isolation resistors in ADC driver or cable-driven applications. |
| EMI rejection ratio | 55dB at 2.4GHz - suppresses RF interference from Wi-Fi/Bluetooth modules in compact portable instrumentation. |
| Input common-mode range | Extends to VSS − 0.1V - enables true low-side current sensing and ground-referenced sensor interfaces without level shifters. |
Applications
| Transimpedance Amplifier (TIA) | pH Probe Interface |
|---|---|
|
Use Scenario: Converting photocurrent from a silicon photodiode (10pF–100pF junction capacitance) into a stable, low-noise voltage signal for optical sensing. IC Role / Device Role / Timing Role: Dual-channel TIA core - Channel A used for primary signal path; Channel B reserved for reference or differential subtraction. Use Value: 0.3pA input bias current prevents DC offset drift; 42MHz GBWP supports >100kHz bandwidth with 1MΩ feedback resistor; 4.2nV/√Hz noise preserves SNR in low-light conditions. |
Use Scenario: Buffering mV-level output from glass pH electrode in lab-grade analyzers or inline process monitoring systems. IC Role / Device Role / Timing Role: High-impedance unity-gain buffer - isolates electrode's >1GΩ source impedance from downstream ADC input and PCB leakage paths. Use Value: 1000GΩ input resistance avoids loading error; rail-to-rail output ensures full-scale utilization of 3.3V ADC; –40°C to +125°C rating supports sterilization cycles. |
| ADC Input Driver | DAC Output Amplifier |
|
Use Scenario: Driving SAR or sigma-delta ADC inputs in precision data acquisition systems requiring <1 LSB error at 16-bit resolution. IC Role / Device Role / Timing Role: Low-distortion, low-noise buffer - placed between anti-alias filter and ADC sample capacitor to maintain charge integrity. Use Value: –106dB THD+N at 1kHz ensures no harmonic folding into Nyquist band; 10V/µs slew rate settles 2V step in <2µs to 0.01% - matching fast ADC aperture times. |
Use Scenario: Amplifying and level-shifting unbuffered DAC outputs (e.g., 0–2.5V) to ±10V industrial control ranges in PLC analog output modules. IC Role / Device Role / Timing Role: Precision gain-stage amplifier - configured for AV = +4 or +5 to achieve required output span while rejecting supply noise. Use Value: 90dB PSRR suppresses DAC reference ripple; 42MHz GBWP enables clean settling of multi-step waveforms; 80°C/W θJC supports convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-input-bias-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | Unity-gain stable (10MHz GBWP), 5.2nV/√Hz noise, 20fA bias current - lower noise density but narrower bandwidth and no shutdown option. | Better suited for DC-critical, low-frequency sensor buffering (e.g., strain gauges); not recommended for >100kHz TIA or fast-settling ADC drivers. | Select OPA2189IDR when ultra-low DC drift (<0.005µV/°C) and sub-20fA bias dominate over speed; avoid where >20MHz closed-loop bandwidth is required. |
| LTC6268IMS8#PBF | Single-channel, 500MHz GBWP, 4.3nV/√Hz, 3fA bias - higher bandwidth but higher quiescent current (3.3mA vs. 2.5mA) and no dual-channel integration. | Ideal for ultra-wideband photodiode receivers; requires two devices for dual-channel needs, increasing board area and layout complexity. | Choose LTC6268IMS8#PBF for >100MHz signal chains or where feed-forward compensation must be minimized; prefer MAX40089AUA+ for space-constrained dual-sensor systems with moderate bandwidth. |
Compared with OPA2189IDR and LTC6268IMS8#PBF, the MAX40089AUA+ uniquely balances 42MHz bandwidth, dual-channel integration, 0.3pA bias current, and µMAX-8 footprint - making it optimal for compact, high-channel-count instrumentation where both speed and ultra-high impedance fidelity are mandatory.
Availability
MAX40089AUA+ is available at Aetrix Electronics and suitable for transimpedance amplifier designs, pH probe interfaces, and ADC buffer circuits requiring stable component supply across automotive, industrial, and medical production programs.
Supply support for MAX40089AUA+ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and healthcare markets.
The MAX40089AUA+ belongs to Analog Devices' MAX400xx ultra-low-input-bias-current op amp family, engineered specifically for high-impedance sensor signal conditioning - including photodiodes, reference electrodes, and piezoelectric transducers - where leakage current and voltage noise directly limit measurement resolution.
FAQ
What is the minimum stable gain for the MAX40089AUA+?
The MAX40089AUA+ is decompensated and specified for stable operation only at closed-loop gains ≥ 5V/V. Attempting unity-gain or AV = 2 configurations risks oscillation due to insufficient phase margin. For unity-gain applications, select the MAX40077 (dual, 10MHz, unity-gain stable) instead. This gain constraint is explicitly defined in the Electrical Characteristics table and confirmed in the Detailed Description section of the datasheet.
Does the MAX40089AUA+ support shutdown functionality?
No, the MAX40089AUA+ does not include a shutdown pin. Shutdown capability is only available on the single-channel variants MAX40079 and MAX40087 (pin 5 = SHDN). The dual-channel MAX40089AUA+ lacks this feature - all pins are dedicated to power, inputs, and outputs. Power management must be handled externally via supply switching or enable circuitry if needed.
What package type is used for the MAX40089AUA+?
The MAX40089AUA+ uses the 8-pin µMAX package (package code U8+1), with outline number 21-0036 and land pattern 90-0092. It measures 3.0mm × 3.0mm × 0.8mm, features an exposed thermal pad, and is RoHS-compliant. This is distinct from the 6-bump WLP (N60F1+1) used for MAX40079 or the 8-bump WLP (N80C1+1) used for MAX40089 in wafer-level packaging variants.
Can the MAX40089AUA+ drive heavy capacitive loads?
Yes - the MAX40089AUA+ is characterized to drive up to 200pF capacitive loads without oscillation, as stated in the Electrical Characteristics table under "Stable Capacitive Load." This makes it suitable for driving ADC input capacitors, long traces, or coaxial cables without requiring external isolation resistors. Stability is maintained even with 1kΩ resistive load in parallel, per the "Stability vs. Capacitive and Resistive Load" graph (toc23).
Is the MAX40089AUA+ suitable for pH electrode applications?
Yes - the MAX40089AUA+ is explicitly recommended for pH probe interfaces due to its 0.3pA typical input bias current, 1000GΩ input resistance, and input common-mode range extending below ground. These features prevent loading error and DC drift in high-impedance glass electrode circuits. Its rail-to-rail output ensures full utilization of 3.3V ADC references, and its –40°C to +125°C rating supports sterilization and industrial deployment.
MAX40089AUA+ 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:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 42 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.3 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 2.2mA (x2 Channels)
- Current - Output / Channel:
- 50 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-uMAX/uSOP
MAX40089AUA+ FAQ
1.How can I place an order for MAX40089AUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX40089AUA+ 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 MAX40089AUA+ reliable?
The price and inventory of MAX40089AUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX40089AUA+ is usually 5 days.
3.What payment methods are accepted for MAX40089AUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX40089AUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX40089AUA+?
MAX40089AUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX40089AUA+ 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 MAX40089AUA+?
For technical support, including MAX40089AUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX40089AUA+ requirements.
6.How does Aetrix verify that MAX40089AUA+ is sourced from the original manufacturer or authorized distributors?
All MAX40089AUA+ 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 MAX40089AUA+ meets industry standards.
7.What is the process for return or replacement of MAX40089AUA+?
All MAX40089AUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX40089AUA+, 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 MAX40089AUA+ part is unused and in its original packaging.
Return procedure for MAX40089AUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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