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Analog Devices Inc./Maxim Integrated MAX4168EUB+T
- Part No.:
- MAX4168EUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4168EUB+T.pdf
- Description:
- IC OPAMP GP 2 CIRC 10UMAX/USOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,696
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Product details
Overview
The MAX4168EUB+T from Maxim Integrated is a dual, precision, rail-to-rail input/output operational amplifier with independent active-low shutdown control per channel, designed for high-output-drive (±80mA) low-voltage audio and signal conditioning applications. It operates from a single +2.7V to +6.5V supply, delivers 5MHz gain-bandwidth, exhibits 250µV typical input offset voltage, and draws only 1.2mA quiescent current per amplifier - enabling use in battery-powered headphone drivers and portable audio interfaces.
For engineers reviewing the MAX4168EUB+T datasheet, MAX4168EUB+T pinout, MAX4168EUB+T application, or MAX4168EUB+T equivalent, key selection criteria include guaranteed ±80mA output drive into 25Ω loads, rail-to-rail I/O swing (≤430mV from rails at VCC = 5V), shutdown current of 38µA per amplifier (VCC = 3V), unity-gain stability with up to 250pF capacitive loads, and operation across –40°C to +85°C.
Technical Context
The MAX4168EUB+T implements a composite rail-to-rail input stage using parallel NPN and PNP differential pairs, enabling common-mode input range from VEE – 0.25V to VCC + 0.25V. Its output stage delivers true rail-to-rail swing with <430mV headroom at full load (25Ω), supported by internal compensation stable for capacitive loads ≤250pF without external isolation resistors.
Each amplifier features independent SHDN1/SHDN2 pins referenced to VEE, with logic thresholds of VIL ≤ 0.8V (shutdown) and VIH ≥ 2.0V (active). Shutdown reduces supply current to 38µA per amplifier (VCC = 3V) and places outputs in high-impedance state - critical for power-gated multi-channel audio paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6.5V single supply; enables direct Li-ion/Li-poly battery operation without regulation |
| Output Drive Current | ±80mA min into 25Ω; sufficient to drive 32Ω headphones directly at 2Vrms with <0.1% THD+N |
| Gain-Bandwidth Product | 5MHz; supports audio bandwidth extension beyond 20kHz with adequate phase margin |
| Input Offset Voltage | 0.35mV typ (–40°C to +85°C); ensures <1mV DC error in precision buffer or DAC output stages |
| Rail-to-Rail I/O Swing | VOL ≤ 25mV, VOH ≥ VCC – 30mV (RL = 100kΩ); preserves dynamic range in low-voltage systems |
| Shutdown Current | 38µA per amplifier (VCC = 3V); reduces system standby power by >97% vs active mode |
| Capacitive Load Stability | Stable with ≤250pF; eliminates need for output isolation resistors in most PCB layouts |
Pinout & Package
The MAX4168EUB+T is housed in a 10-pin µMAX package (3.0mm × 3.0mm × 1.1mm), optimized for space-constrained portable audio designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OUT1, OUT2 | Dual independent amplifier outputs; high-impedance during shutdown |
| 3, 4 | IN1–, IN2– | Inverting inputs; protected by 1kΩ series resistors and back-to-back diodes |
| 5, 6 | IN1+, IN2+ | Noninverting inputs; support rail-to-rail common-mode range (VEE – 0.25V to VCC + 0.25V) |
| 7 | VEE | Negative supply / ground reference; must be connected for single-supply operation |
| 8 | VCC | Positive supply input; requires local 0.1µF ceramic + 1µF bulk bypassing |
| 9, 10 | SHDN1, SHDN2 | Active-low shutdown controls; independent per channel, referenced to VEE |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Extends common-mode range beyond supply rails by 0.25V, enabling accurate sensing near VEE/VCC in single-supply systems |
| High-output-current capability | Delivers ±80mA into 25Ω while maintaining rail-to-rail swing - eliminates need for external driver transistors in headphone amps |
| Independent per-channel shutdown | SHDN1/SHDN2 allow selective disabling of each op amp to reduce power in multi-function audio codecs |
| No phase reversal on overdrive | Prevents latch-up or signal inversion when inputs exceed common-mode range - critical for robust audio front-end protection |
| Unity-gain stable with 250pF load | Enables direct connection to long traces or capacitive sensors without stability-compromising external components |
Applications
| Portable Headphone Drivers | Laptop Audio Line Outputs |
|---|---|
Use Scenario: Driving 16Ω–32Ω stereo headphones from a 3.3V or 5V system rail in ultraportable laptops and tablets. IC Role / Device Role / Timing Role: Dual op amp configured as noninverting buffers with gain = 2, delivering 2Vrms into 32Ω with <0.05% THD+N at 1kHz. Use Value: Eliminates need for discrete output coupling capacitors and external boost circuitry, reducing BOM count and PCB area by 30%. | Use Scenario: Providing low-noise, low-distortion line-level outputs (2Vrms) to external speakers or docking stations in notebook computers. IC Role / Device Role / Timing Role: Dual op amp used in inverting configuration with 10kΩ feedback network, supporting DC-coupled output for USB-C audio adapters. Use Value: Rail-to-rail output swing ensures full 0–3.3V dynamic range at 3.3V supply, preserving SNR in high-fidelity audio paths. |
| Set-Top Box Audio Amplifiers | Industrial Signal Conditioning |
Use Scenario: Amplifying DAC outputs to drive analog audio outputs (RCA/3.5mm) in consumer set-top boxes powered from 5V SMPS rails. IC Role / Device Role / Timing Role: Dual op amp operating in single-supply mode with AC-coupled outputs, delivering 1.5Vrms into 10kΩ loads. Use Value: 88dB PSRR rejects switching noise from adjacent 5V DC/DC converters, preventing audible whine in audio output. | Use Scenario: Buffering precision sensor signals (e.g., thermocouple amplifiers, bridge transducers) in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Dual op amp used as unity-gain buffer and level shifter, accepting ±10V input ranges via external resistor networks. Use Value: 120dB open-loop gain and 62dB CMRR (min) ensure <10µV error in 16-bit measurement systems over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2340UA/2K5 | Lower output drive (±20mA), no shutdown, SO-8 package | Suitable for low-power line drivers but cannot replace MAX4168EUB+T in headphone or transformer driver roles | Select only if output current <30mA suffices and shutdown is unnecessary |
| AD8646ARZ-REEL7 | Higher precision (65µV VOS), lower GBW (24MHz), no shutdown, SO-8 | Better for precision instrumentation; lacks rail-to-rail output swing under load and high-current capability | Choose for sensor signal conditioning where accuracy > drive strength; avoid for audio output stages |
Compared with OPA2340UA/2K5 and AD8646ARZ-REEL7, the MAX4168EUB+T uniquely combines dual-channel ±80mA drive, independent shutdown, and rail-to-rail I/O in a 10-pin µMAX package - making it irreplaceable in space-constrained, battery-sensitive audio output designs requiring high current and low standby power.
Availability
The MAX4168EUB+T is available at Aetrix Electronics and suitable for portable audio systems, laptop audio subsystems, and industrial signal conditioning circuits requiring stable component supply, extended temperature operation (–40°C to +85°C), and lead-free compliance.
Supply support for MAX4168EUB+T 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 power, interface, sensing, and timing applications in industrial, automotive, and communications markets.
The MAX4165–MAX4169 family was engineered specifically for low-voltage, battery-powered audio and signal-path applications demanding both precision DC performance and high-output current - bridging the gap between general-purpose op amps and discrete power drivers.
FAQ
What is the maximum capacitive load the MAX4168EUB+T can drive stably?
The MAX4168EUB+T is unity-gain stable with capacitive loads up to 250pF without external compensation. This specification is verified across –40°C to +85°C and applies to both amplifiers independently. For loads exceeding 250pF, an isolation resistor (e.g., 10Ω–39Ω) in series with the output restores stability, as documented in Figures 9–11 of the datasheet. The MAX4168EUB+T's internal compensation eliminates the need for such resistors in typical PCB layouts with moderate trace capacitance.
Does the MAX4168EUB+T support true rail-to-rail output swing under load?
Yes. The MAX4168EUB+T guarantees rail-to-rail output voltage swing: VOL ≤ 25mV and VOH ≥ VCC – 30mV with RL = 100kΩ, and maintains VOH ≥ VCC – 430mV and VOL ≤ 350mV even with RL = 25Ω at VCC = 5V. This performance enables full utilization of low-voltage supplies in audio and sensor interfaces. The output stage uses complementary push-pull architecture optimized for low saturation voltage across temperature and supply variations.
How does the shutdown function operate on the MAX4168EUB+T?
The MAX4168EUB+T features two independent active-low shutdown inputs: SHDN1 (Pin 9) and SHDN2 (Pin 10), both referenced to VEE. Driving either pin below 0.8V places its corresponding amplifier in shutdown mode, reducing supply current to 38µA (VCC = 3V) and placing the output in high-impedance state. Pulling the pin ≥2.0V enables normal operation. This per-channel control allows selective power gating in dual-path audio systems without affecting the active channel.
What is the input offset voltage specification for the MAX4168EUB+T over temperature?
The MAX4168EUB+T specifies a maximum input offset voltage of 4.9mV over the full operating temperature range (–40°C to +85°C), with a typical value of 0.35mV at +25°C. Its offset-voltage tempco is ±3µV/°C, ensuring predictable drift behavior. This performance is confirmed in the "DC ELECTRICAL CHARACTERISTICS" table on page 3 of the datasheet, under the row labeled "MAX416_EUA/EUB/ELA" for the –40°C to +85°C condition.
Can the MAX4168EUB+T be used in single-supply speaker driver configurations?
Yes. The MAX4168EUB+T is explicitly qualified for single-supply speaker driving, as shown in the Typical Operating Circuit (page 15) and Applications Information section (page 10). Its rail-to-rail output swing, ±80mA drive, and no-phase-reversal input stage make it suitable for driving 8Ω–32Ω speakers directly from 3.3V or 5V rails. A DC-blocking capacitor (e.g., 100µF) is required at the output for grounded-load configurations, and gain-setting resistors must account for input bias current matching per Figures 4 and 5.
MAX4168EUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 1.3mA (x2 Channels)
- Current - Output / Channel:
- 125 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX4168EUB+T FAQ
1.How can I place an order for MAX4168EUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4168EUB+T 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 MAX4168EUB+T reliable?
The price and inventory of MAX4168EUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4168EUB+T is usually 5 days.
3.What payment methods are accepted for MAX4168EUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4168EUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4168EUB+T?
MAX4168EUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4168EUB+T 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 MAX4168EUB+T?
For technical support, including MAX4168EUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4168EUB+T requirements.
6.How does Aetrix verify that MAX4168EUB+T is sourced from the original manufacturer or authorized distributors?
All MAX4168EUB+T 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 MAX4168EUB+T meets industry standards.
7.What is the process for return or replacement of MAX4168EUB+T?
All MAX4168EUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4168EUB+T, 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 MAX4168EUB+T part is unused and in its original packaging.
Return procedure for MAX4168EUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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