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Analog Devices Inc./Maxim Integrated MAX4469ESA
- Part No.:
- MAX4469ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4469ESA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:12,088
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Product details
Overview
MAX4469ESA from Maxim Integrated is a dual, unity-gain stable micropower operational amplifier optimized as a microphone preamplifier in low-noise, battery-powered audio systems. It operates from +2.4V to +5.5V, draws only 24µA per amplifier, delivers 200kHz gain bandwidth, features rail-to-rail outputs, and is housed in an 8-pin SO package for space-constrained portable designs.
For engineers reviewing the MAX4469ESA datasheet, MAX4469ESA pinout, MAX4469ESA application, or MAX4469ESA equivalent, key selection criteria include its dual-channel architecture, 126dB common-mode rejection ratio, 112dB power-supply rejection ratio, shutdown capability (via external control), and suitability for electret microphone biasing in hearing aids and voice-recognition devices.
Technical Context
The MAX4469ESA integrates two independent, unity-gain stable amplifiers with rail-to-rail output stages capable of swinging within 16mV of VCC and GND under 10kΩ load. Its BiCMOS process enables high open-loop gain (125dB at RL = 100kΩ) and low input bias current (±2.5nA typical), supporting precision DC-coupled microphone signal conditioning.
Unlike single-channel variants, the MAX4469ESA provides dual amplification paths without shared internal resources-confirmed by 85dB channel-to-channel isolation at 1kHz-and supports independent feedback networks per channel, enabling stereo or differential preamplification topologies in compact SO-8 layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.4V to +5.5V - Enables direct operation from single Li-ion or 3×AA battery stacks without regulation. |
| Quiescent Supply Current | 24µA per amplifier - Supports multi-day battery life in always-on voice-detection systems. |
| Gain Bandwidth Product | 200kHz - Sufficient for full-bandwidth voice capture (up to 4kHz) with stable unity-gain configuration. |
| Common-Mode Rejection Ratio | 126dB - Rejects PCB-level noise coupling and supply ripple in mixed-signal handheld environments. |
| Power-Supply Rejection Ratio | 112dB - Maintains signal integrity when sharing noisy digital supply rails. |
| Rail-to-Rail Output Swing | Within 16mV of rails at 10kΩ - Maximizes dynamic range for ADC input stages operating at low supply voltages. |
| Channel Isolation | 85dB at 1kHz - Prevents crosstalk between left/right channels in stereo headset applications. |
Pinout & Package
MAX4469ESA is packaged in an 8-pin SO (Small Outline) surface-mount package, measuring 4.9mm × 6.0mm × 1.75mm, with standard 1.27mm pitch and gull-wing leads compatible with automated reflow assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Output of Amplifier A - Drives first-stage signal path; rail-to-rail swing supports wide-voltage-range ADC interfacing. |
| 2 | INA+ | Noninverting input of Amplifier A - Accepts microphone capsule signal; high CMRR minimizes ground-bounce interference. |
| 3 | INA− | Inverting input of Amplifier A - Configured for unity-gain buffer or adjustable gain via external feedback. |
| 4 | GND | Analog ground reference - Must be connected to clean analog ground plane to preserve PSRR and CMRR performance. |
| 5 | INB+ | Noninverting input of Amplifier B - Independent second channel for stereo or dual-mic configurations. |
| 6 | INB− | Inverting input of Amplifier B - Electrically isolated from Amplifier A; enables separate gain/feedback tuning. |
| 7 | OUTB | Output of Amplifier B - Matches OUTA in drive strength and voltage range; supports parallel or differential output routing. |
| 8 | VCC | Positive supply - Requires local 0.1µF ceramic bypass capacitor to GND for high-frequency noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent op amps | Enables stereo microphone preamplification or dual-sensor signal chains without cross-talk or shared resource contention. |
| Unity-gain stability | Guarantees stable operation with no external compensation required, simplifying layout and reducing BOM count. |
| Rail-to-rail output stage | Delivers maximum usable signal swing across full supply range, improving SNR when interfacing with low-voltage ADCs. |
| 126dB CMRR | Rejects electromagnetic interference from nearby RF sections or switching regulators in compact portable PCBs. |
| 24µA per amplifier quiescent current | Allows continuous monitoring in wake-on-voice systems while extending battery runtime beyond 100 hours on coin-cell power. |
Applications
| Hearing Aid Signal Chain | Voice-Recognition Front End |
|---|---|
Use Scenario: Low-power, ultra-compact analog front end for miniature in-the-ear (ITE) hearing aids requiring minimal board area and thermal dissipation. IC Role / Device Role / Timing Role: Dual-channel microphone preamplifier providing simultaneous left/right ear canal signal conditioning with matched gain and phase response. Use Value: 24µA per channel operation extends zinc-air battery life to >14 days; 85dB channel isolation prevents interaural signal leakage. | Use Scenario: Always-listening voice trigger circuit in smart speakers and wearables, where background audio is continuously digitized and analyzed. IC Role / Device Role / Timing Role: Primary analog gain stage before sigma-delta ADC, configured as unity-gain buffer to preserve signal fidelity and minimize group delay. Use Value: 200kHz GBW ensures flat frequency response up to 20kHz; 112dB PSRR rejects noise from co-located Wi-Fi/BT radios. |
| Digital Dictation Recorder | Stereo Headset Interface |
Use Scenario: High-fidelity audio capture in handheld recorders using dual electret microphones for ambient noise cancellation. IC Role / Device Role / Timing Role: Dual preamp driving differential ADC inputs; each channel independently biased and gain-adjusted for adaptive noise subtraction. Use Value: 126dB CMRR suppresses common-mode hum from shared power supply; rail-to-rail swing maximizes ADC utilization at 3.3V operation. | Use Scenario: Integrated microphone preamplifier in USB-C or Bluetooth headsets supporting stereo mic input and mono speaker output. IC Role / Device Role / Timing Role: Dual-channel preamp for left/right beamforming mics, with matched DC offset and AC coupling characteristics. Use Value: Identical electrical specs across both channels ensure consistent beam pattern; SO-8 footprint allows symmetric layout for EMI reduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microphone preamplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4467ESA | Single-channel, includes SHDN and MIC_BIAS pins; same GBW, supply current, and SO-8 package. | Requires external duplication for stereo use; adds shutdown control but lacks second amplifier. | Select when system needs active microphone bias switching and space permits discrete channel replication. |
| TLV2782IDR | Single-supply, rail-to-rail, 2.7–5.5V operation; 170kHz GBW; 25µA IQ; SO-8; no shutdown or MIC_BIAS. | No integrated microphone bias switch; lower CMRR (100dB) and PSRR (90dB); requires external bias network. | Select when cost sensitivity outweighs need for ultra-low noise or integrated bias control in non-critical audio paths. |
Compared with MAX4467ESA and TLV2782IDR, the MAX4469ESA uniquely delivers dual-channel unity-gain amplification with matched performance, eliminating layout asymmetry and component count overhead while maintaining industry-leading CMRR and micropower efficiency.
Availability
MAX4469ESA is available at Aetrix Electronics and suitable for hearing aids, voice-recognition systems, and digital dictation devices requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX4469ESA 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and portable applications.
The MAX4465–MAX4469 family was engineered specifically for ultra-low-power microphone signal conditioning in size- and battery-constrained devices, emphasizing rail-to-rail output swing, high PSRR/CMRR, and minimal quiescent current without sacrificing bandwidth.
FAQ
What is the operating temperature range for MAX4469ESA?
The MAX4469ESA is specified for operation from -40°C to +85°C, matching industrial-grade requirements for portable consumer electronics and medical devices. This range is validated across all key parameters including supply current, CMRR, and gain bandwidth product, ensuring reliable performance in real-world environmental conditions encountered in hearing aids and wearable voice interfaces.
Does MAX4469ESA include a shutdown function?
No, the MAX4469ESA does not include a shutdown function. Shutdown capability is exclusive to the MAX4467/MAX4468 variants, which feature dedicated SHDN and MIC_BIAS pins. The MAX4469ESA is a dual-channel, unity-gain stable amplifier without integrated shutdown logic-its quiescent current remains fixed at 24µA per amplifier across the full supply and temperature range.
Can MAX4469ESA drive a 10kΩ load while maintaining rail-to-rail output swing?
Yes, the MAX4469ESA is characterized to deliver rail-to-rail output swing within 16mV of VCC and GND when driving a 10kΩ load to VCC/2, as confirmed in the Electrical Characteristics table. This performance holds across the full -40°C to +85°C temperature range and +2.4V to +5.5V supply voltage, making it suitable for direct interfacing with low-voltage SAR or sigma-delta ADCs.
What is the channel-to-channel isolation specification for MAX4469ESA?
The MAX4469ESA provides 85dB channel-to-channel isolation at 1kHz, measured between OUTA and OUTB with one channel driven and the other unterminated. This value is explicitly listed in the Electrical Characteristics table and ensures minimal crosstalk in stereo microphone applications, such as beamforming headsets or dual-mic noise cancellation systems.
Is MAX4469ESA unity-gain stable?
Yes, the MAX4469ESA is unity-gain stable, as confirmed in the General Description, Detailed Description, and Selector Guide sections of the datasheet. It delivers a 200kHz gain bandwidth product under unity-gain configuration with no external compensation required, enabling simple, robust microphone buffer implementations in space-constrained layouts.
MAX4469ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
MAX4469ESA FAQ
1.How can I place an order for MAX4469ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4469ESA 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 MAX4469ESA reliable?
The price and inventory of MAX4469ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4469ESA is usually 5 days.
3.What payment methods are accepted for MAX4469ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4469ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4469ESA?
MAX4469ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4469ESA 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 MAX4469ESA?
For technical support, including MAX4469ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4469ESA requirements.
6.How does Aetrix verify that MAX4469ESA is sourced from the original manufacturer or authorized distributors?
All MAX4469ESA 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 MAX4469ESA meets industry standards.
7.What is the process for return or replacement of MAX4469ESA?
All MAX4469ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4469ESA, 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 MAX4469ESA part is unused and in its original packaging.
Return procedure for MAX4469ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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