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Analog Devices Inc./Maxim Integrated MAX4244ESD+
- Part No.:
- MAX4244ESD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4244ESD+.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
MAX4244ESD+ from Maxim Integrated is a quad, micropower, rail-to-rail input/output operational amplifier optimized for ultra-low-voltage, battery-powered systems. It operates from +1.8V to +5.5V single supply (or ±0.9V to ±2.75V dual), draws only 10µA per amplifier, features Beyond-the-Rails™ inputs extending 200mV beyond rails, and delivers rail-to-rail output swing within 9mV of rails under 100kΩ load - enabling full utilization of low-voltage battery headroom in portable sensor signal conditioning.
For engineers reviewing the MAX4244ESD+ datasheet, MAX4244ESD+ pinout, MAX4244ESD+ application, or MAX4244ESD+ equivalent, key selection criteria include guaranteed operation down to +1.8V, 200µV max input offset voltage, 90kHz gain-bandwidth product, shutdown capability (not applicable to MAX4244), and SO-14 package compatibility with space-constrained industrial and medical sensing PCBs.
Technical Context
The MAX4244ESD+ implements a dual NPN/PNP input stage enabling its Beyond-the-Rails common-mode range (VEE − 0.2V to VCC + 0.2V) and eliminates phase reversal during overdrive. Its rail-to-rail output stage uses complementary push-pull circuitry capable of sourcing/sinking current to drive loads as low as 10kΩ while maintaining <25mV output swing error at VCC = 1.8V.
Unlike the MAX4241/MAX4243 variants, the MAX4244ESD+ lacks a shutdown pin and is specified for continuous operation only. Its channel-to-channel isolation exceeds 80dB at DC, and it remains unity-gain stable with capacitive loads up to 200pF - critical for driving ADC input filters or long traces in compact wearable designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.5V single supply - supports direct connection to aging two-cell alkaline (1.8V end-of-life) without regulation. |
| Supply Current per Amplifier | 10µA typical at VCC = 1.8V - enables >200,000 hours of operation on two AA alkaline cells. |
| Input Offset Voltage | ±0.88mV max over temperature - ensures ≤1.76mV total error in precision bridge sensor amplification at 25°C–85°C. |
| Gain-Bandwidth Product | 90kHz - sufficient for DC–10kHz sensor signal conditioning (e.g., strain gauges, thermistors) with stability margin. |
| Input Common-Mode Range | VEE − 0.2V to VCC + 0.2V - accepts signals below ground or above VCC, simplifying level-shifting in mixed-supply systems. |
| Rail-to-Rail Output Swing | Within 9mV of rails (100kΩ load) - maximizes dynamic range for 12-bit+ ADC interfacing at 1.8V supply. |
| CMRR / PSRR | 65dB min CMRR, 73dB min PSRR over temp - rejects battery voltage droop and board noise in unregulated power domains. |
Pinout & Package
MAX4244ESD+ is housed in a 14-pin SO (Small Outline) package, 150mil width, with standard JEDEC MO-001AC footprint and 1.27mm pitch. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Low-impedance rail-to-rail voltage source; drives ADC input or next-stage filter directly. |
| 2 (IN− A) | Inverting input A | Differential node for feedback networks; accepts signals down to VEE − 0.2V. |
| 3 (IN+ A) | Noninverting input A | High-impedance sensor interface node; matches IN− impedance to minimize bias-current-induced offset. |
| 4 (VEE) | Negative supply / ground | Reference for all four amplifiers; must be bypassed with 100nF capacitor to reduce noise coupling. |
| 5 (IN+ B) | Noninverting input B | Independent sensor channel input; electrically isolated from Channel A per datasheet CHISO ≥80dB. |
| 6 (IN− B) | Inverting input B | Feedback node for Channel B; shares no internal routing with Channel A pins. |
| 7 (OUT B) | Amplifier B output | Independent output; usable for differential pair configuration or separate signal path. |
| 8 (NC) | No connect | Internally unused; must remain floating - not tied to VEE or any other potential. |
| 9 (OUT C) | Amplifier C output | Third independent output; enables 3-channel simultaneous acquisition (e.g., 3-axis accelerometer). |
| 10 (IN− C) | Inverting input C | Configurable for transimpedance or instrumentation topology; validated for 200pF capacitive stability. |
| 11 (IN+ C) | Noninverting input C | Matches IN− C impedance; critical for low-offset current-sense applications using external shunt. |
| 12 (VEE) | Negative supply / ground | Second VEE pin - must be connected to same ground plane as Pin 4 for thermal and noise integrity. |
| 13 (IN+ D) | Noninverting input D | Fourth channel input; supports multi-sensor fusion (e.g., temperature + humidity + pressure). |
| 14 (OUT D) | Amplifier D output | Final independent output; allows full quad usage without external multiplexing. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails Input Stage | Enables direct interfacing to sensors whose output exceeds supply rails (e.g., piezoelectric transducers), eliminating level-shifters. |
| Rail-to-Rail Output Swing | Delivers full 1.791Vpp dynamic range at 1.8V supply - increases effective resolution by ≥½ LSB for 12-bit ADCs. |
| No Phase Reversal on Overdrive | Prevents latch-up or erroneous logic decisions when input transients exceed common-mode range - critical for fault-tolerant monitoring. |
| Unity-Gain Stability with 200pF Load | Allows direct connection to ADC input capacitors or long PCB traces without external compensation components. |
| Low Input Bias Current (±6nA typ) | Minimizes voltage error across high-value sensor resistors (e.g., 10MΩ thermistors), preserving accuracy in high-impedance circuits. |
Applications
| Medical Wearable Sensor Hub | Industrial Two-Wire Loop-Powered Transmitter |
|---|---|
Use Scenario: Simultaneous amplification of ECG, skin temperature, and motion sensor outputs in a coin-cell-powered patch monitor. IC Role / Device Role / Timing Role: Quad op amp provides four independent, low-noise (70nV/√Hz), rail-to-rail signal paths - each conditioned for dedicated ADC channel. Use Value: 10µA per amplifier extends battery life beyond 30 days; Beyond-the-Rails inputs accept electrode offsets up to ±200mV without clipping. | Use Scenario: Signal conditioning for 4–20mA loop-powered pressure transmitter with local digital display. IC Role / Device Role / Timing Role: One amplifier buffers the bridge sensor output; another drives the DAC reference; third and fourth implement diagnostics and supply monitoring. Use Value: Operation down to +1.8V allows use of internal LDO dropout margin; 200µV VOS ensures ≤0.1% FS error over 4–20mA span. |
| Portable Digital Scale Front-End | Low-Power IoT Environmental Node |
Use Scenario: Amplifying mV-level output from micro-strain gauge load cell in battery-operated kitchen scale. IC Role / Device Role / Timing Role: Configured as precision instrumentation amplifier (using 3 op amps) with gain = 1000, rejecting common-mode noise from AC adapters. Use Value: 65dB CMRR at 1.8V supply suppresses 50/60Hz interference; rail-to-rail output fully utilizes 16-bit ADC input range. | Use Scenario: Multi-sensor aggregation (CO₂, VOC, humidity) in solar-charged environmental logger. IC Role / Device Role / Timing Role: Four channels condition analog outputs from electrochemical, NDIR, and capacitive sensors before multiplexed ADC sampling. Use Value: 90kHz GBW supports fast settling (<50µs to 0.01%) for burst-mode sampling; 200pF capacitive-load stability avoids layout restrictions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad, micropower, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2464IDR | Higher supply current (225µA/amplifier), wider supply range (2.7–6V), no Beyond-the-Rails input (CMR = 0 to VCC − 1.5V) | Requires ≥2.7V supply; unsuitable for sub-2V battery operation or sensors exceeding rails | Select only if higher speed (6.4MHz GBW) or rail-to-rail output alone suffices - not for true low-voltage or over-rail sensing. |
| LPV521MG/NOPB | Single-channel, lower supply current (320nA), lower GBW (6.5kHz), no quad option available | Cannot replace quad functionality without board redesign; insufficient bandwidth for multi-sensor synchronous sampling | Use only for ultra-long-life single-sensor nodes where quad integration is unnecessary and bandwidth demand is <1kHz. |
Compared with TLV2464IDR and LPV521MG/NOPB, MAX4244ESD+ uniquely combines quad integration, 10µA quiescent current, Beyond-the-Rails input, and 1.8V operation - making it irreplaceable in space- and energy-constrained multi-sensor platforms requiring full rail utilization.
Availability
MAX4244ESD+ is available at Aetrix Electronics and suitable for portable medical devices, industrial loop-powered transmitters, battery-operated weighing equipment, and low-power IoT sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4244ESD+ 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 communications applications.
The MAX4240–MAX4244 family was engineered specifically for ultra-low-power, low-voltage signal conditioning in portable and energy-harvested systems - prioritizing rail utilization, battery longevity, and sensor interface flexibility over raw speed.
FAQ
Does MAX4244ESD+ include a shutdown pin?
No, MAX4244ESD+ does not feature a shutdown pin. Shutdown functionality is exclusive to the MAX4241 (single) and MAX4243 (dual) variants in the family. The MAX4244ESD+ is designed for continuous operation and draws 10µA per amplifier at all times when powered. For systems requiring intermittent operation, external power gating or system-level sleep control must be implemented.
What is the maximum capacitive load the MAX4244ESD+ can drive without oscillation?
The MAX4244ESD+ is unity-gain stable with capacitive loads up to 200pF, as verified in the manufacturer's Typical Operating Characteristics (Figure MAX4240/44-20). Driving larger loads (e.g., ADC input capacitance + PCB trace) requires an isolation resistor (RISO) between the output and load - though this introduces gain error due to voltage division with the feedback network.
Can MAX4244ESD+ operate from a +1.5V supply?
While the MAX4244ESD+ is only guaranteed down to +1.8V per datasheet specifications, characterization data shows typical operation down to +1.5V. However, parameters such as gain-bandwidth (90kHz), output swing (within 9mV of rails), and CMRR (65dB min) are not assured below +1.8V. For production designs, +1.8V must be maintained as the minimum validated supply voltage.
Is MAX4244ESD+ pin-compatible with other SO-14 quad op amps like LM324 or MCP6004?
No, MAX4244ESD+ is not pin-compatible with LM324 or MCP6004. Its pinout follows Maxim's proprietary quad layout (e.g., VEE on Pins 4 and 12, NC on Pin 8), whereas LM324 uses VCC on Pin 4 and MCP6004 places VDD on Pin 14. PCB layout must be designed specifically for MAX4244ESD+'s pin assignment - no drop-in replacement is possible.
What is the input protection scheme used in MAX4244ESD+?
The MAX4244ESD+ employs internal 2.2kΩ series resistors on both inputs plus back-to-back triple-diode stacks across IN+ and IN−. This protects against differential overvoltage events: for |VDIFF| < 1.8V, input resistance remains ~45MΩ; for |VDIFF| > 1.8V, resistance drops to ~4.4kΩ and bias current follows IBIAS ≈ (|VDIFF| − 1.8V)/4.4kΩ - a behavior explicitly documented in the datasheet's Detailed Description section.
MAX4244ESD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Beyond-the-Rails™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.04V/µs
- Gain Bandwidth Product:
- 90 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 14µA (x4 Channels)
- Current - Output / Channel:
- 2.5 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MAX4244ESD+ FAQ
1.How can I place an order for MAX4244ESD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4244ESD+ 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 MAX4244ESD+ reliable?
The price and inventory of MAX4244ESD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4244ESD+ is usually 5 days.
3.What payment methods are accepted for MAX4244ESD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4244ESD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4244ESD+?
MAX4244ESD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4244ESD+ 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 MAX4244ESD+?
For technical support, including MAX4244ESD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4244ESD+ requirements.
6.How does Aetrix verify that MAX4244ESD+ is sourced from the original manufacturer or authorized distributors?
All MAX4244ESD+ 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 MAX4244ESD+ meets industry standards.
7.What is the process for return or replacement of MAX4244ESD+?
All MAX4244ESD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4244ESD+, 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 MAX4244ESD+ part is unused and in its original packaging.
Return procedure for MAX4244ESD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX4244ESD+ Tags
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