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Analog Devices Inc./Maxim Integrated MAX4234ASD+
- Part No.:
- MAX4234ASD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4234ASD+.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,353
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Product details
Overview
MAX4234ASD+ from Maxim Integrated is a quad, rail-to-rail input/output CMOS operational amplifier optimized for high-current output drive (200mA peak), 10MHz gain-bandwidth product, and 10V/μs slew rate, operating from a single 2.7V to 5.5V supply. It delivers headset-level audio (32Ω) and RF power amplifier biasing in wireless handsets.
For engineers reviewing the MAX4234ASD+ datasheet, MAX4234ASD+ pinout, MAX4234ASD+ application, or MAX4234ASD+ equivalent, key selection criteria include quad-channel rail-to-rail I/O performance, shutdown capability per channel (not present in MAX4234), 14-pin SO package thermal limits, and capacitive-load stability up to 780pF.
Technical Context
The MAX4234ASD+ implements parallel n- and p-channel differential input stages enabling true rail-to-rail common-mode input range (VSS to VDD). Its output stage supports rail-to-rail swing with guaranteed 500mV headroom at 32Ω load under 2.7V supply.
It features unity-gain stability with capacitive loads ≤780pF and exhibits no phase reversal on overdriven inputs. The device lacks integrated shutdown-unlike MAX4231/MAX4233-so external control of bias paths is required for power-gating applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 5.5V single supply - enables direct integration into 3.3V and 5V portable systems without level-shifting. |
| Gain-Bandwidth Product | 10MHz - supports stable closed-loop gain ≥10 at 1MHz, suitable for audio preamp and RF bias filtering. |
| Slew Rate | 10V/μs - ensures <5µs settling for 2V step with minimal overshoot in headphone driver transient response. |
| Output Drive | 200mA peak - drives 32Ω headphones at 60mW/channel or biases Class-AB RF PAs without external buffers. |
| Input Offset Voltage | ±8mV max - maintains DC accuracy in precision bias networks and DAC output buffering. |
| PSRR / CMRR | 70dB min PSRR, 46dB min CMRR - suppresses supply noise and common-mode interference in noisy handset environments. |
| Capacitive Load Stability | Stable up to 780pF - allows direct connection to ADC input caps or long PCB traces without isolation resistors. |
Pinout & Package
MAX4234ASD+ is housed in a 14-pin SO (Small Outline) package with exposed pad option not specified. Thermal derating is 11.9mW/°C above +70°C, supporting ≤952.4mW continuous dissipation at TA = +70°C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT4 | Amplifier 4 output - rail-to-rail capable, sinks/sources 200mA, requires local decoupling for high-frequency stability. |
| 2 | IN4− | Inverting input to Amp 4 - high-impedance (1000MΩ), sensitive to layout-induced coupling; keep trace short. |
| 3 | IN4+ | Noninverting input to Amp 4 - matched to IN4− for optimal CMRR; avoid asymmetric parasitic capacitance. |
| 4 | VSS | Negative supply - connect directly to low-impedance ground plane; shared return for all four amplifiers. |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor close to pin; supports 2.7–5.5V operation. |
| 6 | IN1+ | Noninverting input to Amp 1 - identical electrical behavior to IN4+; usable as reference buffer input. |
| 7 | IN1− | Inverting input to Amp 1 - forms feedback node with Rf; input capacitance 8pF affects high-Z gain-setting networks. |
| 8 | OUT1 | Amplifier 1 output - electrically isolated from other outputs; may drive independent loads (e.g., dual PA bias paths). |
| 9 | OUT2 | Amplifier 2 output - shares VDD/VSS rails; thermal crosstalk possible under sustained 200mA load per channel. |
| 10 | IN2− | Inverting input to Amp 2 - matches IN1− characteristics; use symmetric routing for matched channels. |
| 11 | IN2+ | Noninverting input to Amp 2 - referenced to same VDD/VSS; suitable for differential input stage front-end. |
| 12 | VSS | Second VSS pin - internal bond-wire connection; must be tied to same ground net as Pin 4. |
| 13 | IN3− | Inverting input to Amp 3 - identical AC/DC specs to other inputs; no shutdown logic present. |
| 14 | IN3+ | Noninverting input to Amp 3 - completes quad configuration; no dedicated SHDN pin - all amps always active. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode range extends from VSS to VDD; output swings within 500mV of rails at 32Ω - eliminates need for split supplies in portable audio. |
| High-output current | 200mA peak sourcing/sinking - drives low-Z loads (32Ω headphones, RF PA bias nodes) without external transistors. |
| No phase reversal | Guaranteed absence of output polarity inversion during input overdrive - prevents latch-up or uncontrolled RF PA activation. |
| Capacitive-load tolerance | Stable with up to 780pF load capacitance - simplifies anti-alias filter design and eliminates series isolation resistors in ADC buffering. |
| Low quiescent current | 1.1–2.3mA per amplifier at 2.7–5.5V - extends battery life in always-on bias circuits and portable audio subsystems. |
Applications
| RF PA Biasing Controls in Handset Applications | Portable Headphone Speaker Drivers (32Ω) |
|---|---|
Use Scenario: Biasing Class-AB RF power amplifiers in GSM/UMTS/WCDMA handsets to maintain linearity across temperature and battery voltage variation. IC Role / Device Role / Timing Role: Quad op-amp provides independent, precision DC bias voltages to four PA stages while rejecting supply ripple via 70dB PSRR. Use Value: Enables simultaneous multi-band PA operation with <1% THD+N at 10kHz and 2VP-P output, reducing need for discrete bias networks. | Use Scenario: Driving stereo 32Ω earbud transducers from a single 5V supply in Bluetooth headsets and voice assistants. IC Role / Device Role / Timing Role: Two channels operate as noninverting headphone drivers; remaining two serve as VBias/VREF generators for analog signal chain. Use Value: Delivers 60mW/channel at 1% THD+N without output coupling capacitors when used in bridge-tied load (BTL) configuration. |
| Transformer/Line Drivers | Digital-to-Analog Converter Buffers |
Use Scenario: Driving balanced analog line outputs (e.g., 600Ω) in portable audio interfaces and USB-C DAC dongles. IC Role / Device Role / Timing Role: Configured as differential line driver using two amplifiers per channel; third/fourth provide common-mode feedback and VCM control. Use Value: Achieves >125dB channel-to-channel isolation at 1kHz and ±100mV input offset - preserves dynamic range in pro-audio signal paths. | Use Scenario: Buffering 16-bit DAC outputs in tablet audio subsystems where DC accuracy and fast settling are critical. IC Role / Device Role / Timing Role: Unity-gain follower per DAC channel; leverages 10MHz GBWP and 10V/μs slew rate for <1µs 0.1% settling on 2V steps. Use Value: Maintains monotonicity and reduces code-dependent glitches by minimizing output impedance (<10Ω at DC, <1Ω at 100kHz). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4234AUD/V+T | AEC-Q100 qualified automotive grade; identical electrical specs and 14-pin TSSOP package; RoHS-compliant. | Qualified for under-hood and infotainment systems requiring extended temperature (-40°C to +125°C) and lifetime reliability validation. | Select MAX4234AUD/V+T for automotive designs requiring PPAP documentation and zero-defect manufacturing traceability. |
| LMV324IDR | Lower output drive (60mA), 1MHz GBWP, no rail-to-rail output swing (min 0.5V from rails), 14-pin SO package. | Suitable for general-purpose signal conditioning but cannot drive 32Ω loads or meet RF PA bias accuracy requirements. | Choose LMV324IDR only for cost-sensitive, low-speed applications where 200mA drive and rail-to-rail swing are unnecessary. |
Compared with MAX4234ASD+, MAX4234AUD/V+T adds automotive qualification without electrical trade-offs, while LMV324IDR sacrifices bandwidth, drive strength, and rail-to-rail capability for lower cost and power - making it unsuitable for headset or RF bias roles.
Availability
MAX4234ASD+ is available at Aetrix Electronics and suitable for RF power amplifier biasing, portable headphone driver circuits, transformer/line driving, DAC buffering, and motor control feedback loops requiring stable component supply and consistent parametric performance across production lots.
Supply support for MAX4234ASD+ 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, communications, and consumer applications.
The MAX4230–MAX4234 family was engineered specifically for high-output-drive, rail-to-rail op-amp roles in space-constrained portable electronics - especially RF PA biasing and low-impedance audio driver circuits.
FAQ
Does MAX4234ASD+ include a shutdown feature?
No, MAX4234ASD+ does not incorporate a shutdown function. Unlike the MAX4231 and MAX4233 variants, the MAX4234ASD+ has no SHDN pin and operates continuously when powered. To achieve power gating, external MOSFET switches or system-level enable control must be implemented. This design choice prioritizes simplicity and full-time analog path integrity over low-quiescent-power sleep modes.
What is the maximum safe continuous output current for MAX4234ASD+ at 5V supply?
The MAX4234ASD+ is rated for 200mA peak output current per amplifier, but continuous DC current must be limited to avoid exceeding package power dissipation. At 5V supply and ambient +70°C, the 14-pin SO package supports ≤952.4mW. With worst-case 500mV output headroom, continuous sourcing/sinking should be capped at ~40mA per channel to stay within thermal limits - verified using the RMS power equation in the datasheet.
Can MAX4234ASD+ drive a 16Ω speaker load?
Yes, MAX4234ASD+ can drive a 16Ω load, but output swing and distortion will degrade versus 32Ω. At 5V supply, the guaranteed output swing is 400mV from rails into 200Ω, and drops further into 16Ω. For 16Ω, expect ~250mV headroom and increased THD+N (>0.01%) above 1kHz. Use bridge-tied load (BTL) configuration with two channels to double effective voltage swing and restore performance.
Is MAX4234ASD+ pin-compatible with other devices in the MAX4230–MAX4234 family?
No, MAX4234ASD+ is not pin-compatible with other members of the MAX4230–MAX4234 family. It uses a 14-pin SO package with unique pinout (e.g., Pins 1–3 = OUT4/IN4−/IN4+, Pins 13–14 = IN3−/IN3+), whereas MAX4230 (5-pin SC70), MAX4231 (6-pin SC70), and MAX4233 (10-pin μMAX/UCSP) have entirely different footprints and terminal assignments. Board redesign is required for substitution.
What is the recommended bypass capacitor for MAX4234ASD+?
A 0.1µF X7R ceramic capacitor placed within 2mm of the VDD (Pin 5) and VSS (Pins 4 & 12) pins is mandatory for stable operation. For systems with high di/dt noise, add a 4.7µF–10µF tantalum or polymer capacitor in parallel on the board's main VDD rail. Avoid electrolytic capacitors near the IC due to ESR-induced instability at high frequencies.
MAX4234ASD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 850 µV
- Current - Supply:
- 1.2mA (x4 Channels)
- Current - Output / Channel:
- 200 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:
- 14-SOIC
MAX4234ASD+ FAQ
1.How can I place an order for MAX4234ASD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4234ASD+ 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 MAX4234ASD+ reliable?
The price and inventory of MAX4234ASD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4234ASD+ is usually 5 days.
3.What payment methods are accepted for MAX4234ASD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4234ASD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4234ASD+?
MAX4234ASD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4234ASD+ 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 MAX4234ASD+?
For technical support, including MAX4234ASD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4234ASD+ requirements.
6.How does Aetrix verify that MAX4234ASD+ is sourced from the original manufacturer or authorized distributors?
All MAX4234ASD+ 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 MAX4234ASD+ meets industry standards.
7.What is the process for return or replacement of MAX4234ASD+?
All MAX4234ASD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4234ASD+, 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 MAX4234ASD+ part is unused and in its original packaging.
Return procedure for MAX4234ASD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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