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Analog Devices Inc./Maxim Integrated MAX4469EKA
- Part No.:
- MAX4469EKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
MAX4469EKA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:959
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Product details
Overview
MAX4469EKA from Maxim Integrated is a dual-channel, unity-gain stable micropower operational amplifier optimized for electret microphone preamplification in battery-powered voice interfaces. It delivers 200kHz gain bandwidth at only 24µA per amplifier, operates from +2.4V to +5.5V, features rail-to-rail outputs, and is housed in an 8-pin SOT23 package. It enables low-noise, high-CMRR signal conditioning in space-constrained portable audio systems.
For engineers reviewing the MAX4469EKA datasheet, MAX4469EKA pinout, MAX4469EKA application, or MAX4469EKA equivalent, key selection criteria include its dual-channel topology, 24µA quiescent current per op amp, 200kHz GBWP, 126dB CMRR, and absence of shutdown or MIC_BIAS functionality-distinguishing it from MAX4467/MAX4468 variants.
Technical Context
The MAX4469EKA integrates two independent, unity-gain stable amplifiers in a single 8-pin SOT23 package, each with rail-to-rail output swing within 16mV of supply rails into 10kΩ. Its BiCMOS process enables 125dB open-loop gain (AVOL) and 112dB PSRR while maintaining micropower operation.
It supports noninverting microphone preamp configurations with high input impedance and exhibits 85dB channel-to-channel isolation at 1kHz-critical for stereo or differential sensing. Unlike MAX4467/MAX4468, it lacks SHDN and MIC_BIAS pins, confirming its role as a fixed-function dual preamp without bias control or power gating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.4V to +5.5V - Enables direct operation from single Li-ion cell or 3.3V/5V rails without regulation. |
| Quiescent Current (per amp) | 24µA typical - Supports multi-day battery life in always-on voice wake-up systems. |
| Gain Bandwidth Product | 200kHz - Sufficient for full-bandwidth voice capture (up to ~20kHz with margin) at unity gain. |
| Common-Mode Rejection Ratio | 126dB - Rejects PCB-level noise and supply ripple in noisy handheld environments. |
| Open-Loop Gain (AVOL) | 125dB (RL = 100kΩ) - Ensures <0.02% gain error in precision microphone gain stages. |
| Rail-to-Rail Output Swing | Within 16mV of VCC/GND (RL = 10kΩ) - Maximizes dynamic range when interfacing to 10-bit+ ADCs. |
| Channel Isolation | 85dB at 1kHz - Prevents crosstalk between left/right channels in stereo headset applications. |
Pinout & Package
MAX4469EKA is packaged in an 8-pin SOT23 (SOT23-8) surface-mount package measuring 2.9mm × 1.6mm × 1.1mm, optimized for ultra-compact portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Output of Amplifier A - Drives first-stage signal to downstream filter or ADC buffer. |
| 2 | INA+ | Noninverting input of Amplifier A - Connects to electret microphone's signal node via AC coupling. |
| 3 | INA− | Inverting input of Amplifier A - Configured for noninverting gain via external feedback resistor network. |
| 4 | GND | Analog ground reference - Must be connected to clean analog ground plane to preserve CMRR. |
| 5 | INB+ | Noninverting input of Amplifier B - Dedicated input for second microphone or differential pair. |
| 6 | INB− | Inverting input of Amplifier B - Used for gain-setting feedback in dual-mic or stereo configurations. |
| 7 | OUTB | Output of Amplifier B - Independent output path enabling simultaneous dual-channel processing. |
| 8 | VCC | Positive supply - Requires local 0.1µF ceramic bypass capacitor to GND for PSRR integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent amplifiers | Enables stereo microphone inputs or redundant signal paths without doubling board area or BOM count. |
| 24µA per amplifier supply current | Reduces total preamp current to 48µA - critical for multi-mic arrays in hearables with tight thermal budgets. |
| 126dB common-mode rejection ratio | Mitigates ground bounce and EMI-induced offset in shared-PCB layouts with digital processors. |
| Rail-to-rail output stage | Delivers >99% of full-scale voltage swing - preserves SNR when driving low-voltage SAR or sigma-delta ADCs. |
| 85dB channel-to-channel isolation | Prevents audible crosstalk in binaural recording or directional beamforming applications. |
Applications
| Smart Headsets | Voice-Activated Remote Controls |
|---|---|
|
Use Scenario: Dual-microphone array in Bluetooth headsets performing adaptive noise cancellation and beam steering. IC Role / Device Role / Timing Role: Dual-channel preamplifier providing matched gain and phase response for real-time DSP correlation. Use Value: 85dB channel isolation and 126dB CMRR ensure clean differential signal acquisition despite RF interference and mechanical vibration. |
Use Scenario: Low-power voice command interface in infrared remote controls with always-listening capability. IC Role / Device Role / Timing Role: Mic preamp conditioning signal for ultra-low-power wake-word detector ASIC before full MCU activation. Use Value: 24µA per amplifier current allows continuous listening for >1 year on CR2032 coin cell, enabled by minimal active power draw. |
| Digital Voice Recorders | Hearing Aid Front-Ends |
|
Use Scenario: High-fidelity mono/stereo recording in pocket-sized digital dictation devices. IC Role / Device Role / Timing Role: First-stage gain block setting system noise floor and dynamic range prior to sigma-delta ADC conversion. Use Value: 200kHz GBWP and rail-to-rail output support wideband audio capture up to 20kHz with <0.02% THD+N at 1kHz. |
Use Scenario: Input conditioning stage in miniaturized hearing aids requiring ultra-low power and minimal self-noise. IC Role / Device Role / Timing Role: Mic preamplifier amplifying weak electret capsule signals while rejecting body-worn EMI and power supply ripple. Use Value: 112dB PSRR and 126dB CMRR suppress switching noise from adjacent DC-DC converters and digital logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microphone preamplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4467EKA-T | Single-channel, includes SHDN and MIC_BIAS pins; same 200kHz GBWP and 24µA ICC. | Supports microphone bias control and complete shutdown - suitable for single-mic systems needing power gating. | Select MAX4467EKA-T when microphone bias management or ultra-low standby current (<5nA) is required. |
| MAX4469ESA | Same electrical specs and pinout, but in 8-pin SO package (5.0mm × 4.0mm) instead of SOT23-8. | SO package eases prototyping and manual assembly but occupies ~7× more board area than SOT23-8. | Choose MAX4469ESA only for lab validation or low-volume production where SMT placement capability is limited. |
Compared with MAX4467EKA-T, MAX4469EKA provides dual-channel capability without shutdown overhead; compared with MAX4469ESA, it delivers identical performance in a footprint-optimized SOT23-8 package essential for wearables and hearables.
Availability
MAX4469EKA is available at Aetrix Electronics and suitable for smart headsets, voice-activated remote controls, digital voice recorders, hearing aid front-ends, and portable computing peripherals requiring stable component supply and long-term manufacturability.
Supply support for MAX4469EKA 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX4465–MAX4469 family was designed specifically for ultra-low-power, high-precision microphone signal conditioning in battery-operated voice interfaces-prioritizing micropower operation, rail-to-rail output, and noise immunity over general-purpose op amp versatility.
FAQ
What is the operating temperature range for MAX4469EKA?
The MAX4469EKA is specified for operation from -40°C to +85°C, matching industrial-grade requirements for portable electronics deployed across diverse environmental conditions. This range is validated across all key parameters including supply current, CMRR, and gain bandwidth product, ensuring reliable microphone preamplification in outdoor wearables and automotive cabin microphones.
Does MAX4469EKA include a shutdown function?
No, MAX4469EKA does not include a shutdown function. Unlike MAX4467/MAX4468 variants, it lacks SHDN and MIC_BIAS pins. Its pinout consists solely of dual amplifier I/O and power terminals (VCC/GND). For applications requiring shutdown, MAX4467EKA-T is the functional single-channel alternative with identical GBWP and quiescent current.
Can MAX4469EKA drive a 10kΩ load while maintaining rail-to-rail output swing?
Yes, MAX4469EKA delivers rail-to-rail output swing within 16mV of VCC and GND when driving a 10kΩ load, as confirmed in the Electrical Characteristics table (VOH/VOL specifications). This performance holds across the full -40°C to +85°C temperature range and supports direct interfacing to low-voltage ADCs without level-shifting circuitry.
What is the input bias current specification for MAX4469EKA?
The input bias current for MAX4469EKA is ±2.5nA typical (±100nA max) at VCM = -0.1V, as specified in the Electrical Characteristics table. This ultra-low value minimizes voltage drop across high-impedance microphone bias networks and preserves signal integrity in electret capsule interfaces where source impedances exceed 2kΩ.
Is MAX4469EKA unity-gain stable?
Yes, MAX4469EKA is unity-gain stable, with a guaranteed 200kHz gain bandwidth product at AV = +1. This stability is inherent to its internal compensation and is verified across capacitive loads up to 100pF, making it suitable for noninverting microphone preamp configurations without external compensation components.
MAX4469EKA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.045V/µs
- Gain Bandwidth Product:
- 200 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2.5 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 24µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.4 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX4469EKA FAQ
1.How can I place an order for MAX4469EKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4469EKA 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 MAX4469EKA reliable?
The price and inventory of MAX4469EKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4469EKA is usually 5 days.
3.What payment methods are accepted for MAX4469EKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4469EKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4469EKA?
MAX4469EKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4469EKA 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 MAX4469EKA?
For technical support, including MAX4469EKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4469EKA requirements.
6.How does Aetrix verify that MAX4469EKA is sourced from the original manufacturer or authorized distributors?
All MAX4469EKA 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 MAX4469EKA meets industry standards.
7.What is the process for return or replacement of MAX4469EKA?
All MAX4469EKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4469EKA, 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 MAX4469EKA part is unused and in its original packaging.
Return procedure for MAX4469EKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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