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Analog Devices Inc./Maxim Integrated MAX1238EEE/V+T
- Part No.:
- MAX1238EEE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1238EEE/V+T.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,890
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Product details
Overview
The MAX1238EEE/V+T from Maxim Integrated is a 12-bit, 12-channel analog-to-digital converter (ADC) with I²C-compatible 2-wire serial interface, internal 4.096V reference, and single-supply operation from 4.5V to 5.5V. It delivers 94.4ksps throughput, ±1 LSB INL/DNL accuracy, and ultra-low 670µA supply current at full rate-enabling high-resolution sensing in space-constrained industrial monitoring and automotive body electronics.
For engineers reviewing the MAX1238EEE/V+T datasheet, MAX1238EEE/V+T pinout, MAX1238EEE/V+T application, or MAX1238EEE/V+T equivalent, key selection criteria include its QSOP-16 package, automotive-grade qualification (-40°C to +85°C), 12-channel software-configurable unipolar/bipolar analog input architecture, and support for both internal clock and external clock modes up to 1.7MHz I²C high-speed mode.
Technical Context
The MAX1238EEE/V+T implements successive-approximation ADC architecture with fully differential track/hold circuitry and integrated 4.096V voltage reference. Its 12-channel analog multiplexer supports configurable single-ended (12 inputs) or fully differential (6 pairs) operation, with software-selectable unipolar or bipolar ranges determined by the internal reference or external 1V–VDD source.
It features an internal FIFO and channel-scan mode for autonomous multi-channel acquisition, AutoShutdown™ reducing current to <0.5µA in power-down, and robust 2-wire timing compliant with I²C Fast Mode (400kHz) and High-Speed Mode (1.7MHz), including dedicated HS-mode entry via master code 00001XXX.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization in precision sensor interfaces. |
| Input Channels | 12 single-ended or 6 fully differential - enables consolidated monitoring of multiple analog sensors without external muxing. |
| Internal Reference | 4.096V - provides stable, factory-trimmed full-scale range; eliminates need for external reference in most applications. |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V industrial and automotive power rails; no level-shifting required. |
| Throughput Rate | 94.4ksps - supports real-time sampling of fast transients (e.g., motor current ripple, battery cell voltage dynamics). |
| INL / DNL | ±1 LSB - ensures monotonicity and minimal code-width variation across temperature, critical for closed-loop control accuracy. |
| Supply Current | 670µA at 94.4ksps; 6µA at 1ksps - enables energy-efficient operation in duty-cycled or low-power wake-up systems. |
Pinout & Package
MAX1238EEE/V+T is housed in a 16-pin QSOP package (3.9mm × 4.9mm, 0.635mm pitch), optimized for automated assembly and thermal performance in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 4–8, 14–16 | AIN0–AIN10 | Analog input channels - support software-configurable single-ended or differential acquisition; absolute input range: GND to VDD. |
| 13 | AIN11/REF | Configurable analog input or reference I/O - selectable as 12th input or external reference source/sink (1V to VDD). |
| 5 | SCL | I²C clock input - accepts Fast Mode (400kHz) or High-Speed Mode (1.7MHz); requires external pull-up resistor. |
| 6 | SDA | I²C bidirectional data line - open-drain structure; supports multi-master bus arbitration and ACK/NACK handshaking. |
| 7 | GND | Analog/digital ground reference - must be connected to low-impedance system ground plane for noise immunity. |
| 8 | VDD | Positive supply - bypassed with 0.1µF ceramic capacitor near pin to suppress switching noise and ensure stable conversion. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <0.5µA between conversions - extends battery life in intermittent-sampling applications like telematics event logging. |
| Internal FIFO + Channel-Scan Mode | Enables autonomous sequential conversion of all 12 channels without host intervention - simplifies firmware and reduces CPU load. |
| Software-Configurable Input Modes | Single-ended/differential and unipolar/bipolar selection via setup register - eliminates hardware rework for varying sensor types (e.g., thermocouples vs. RTDs). |
| High-Speed I²C Interface | 1.7MHz operation with dedicated HS-mode entry - achieves 94.4ksps while maintaining compatibility with standard microcontroller peripherals. |
| Robust Analog Input Protection | Clamp diodes allow safe overvoltage tolerance (GND −0.3V to VDD +0.3V); 22pF input capacitance minimizes charge injection errors during multiplexing. |
Applications
| Automotive Body Control Module | Industrial Sensor Hub |
|---|---|
Use Scenario: Monitoring door lock status, seat position, ambient light, and HVAC thermistors in a centralized vehicle ECU. IC Role / Device Role / Timing Role: 12-channel ADC digitizing multiple analog sensor outputs with synchronized sampling and I²C burst reads. Use Value: Reduces BOM count by replacing four 4-channel ADCs; automotive qualification (-40°C to +85°C) ensures reliability under hood conditions. |
Use Scenario: Aggregating temperature, pressure, and current measurements from distributed field sensors in a PLC I/O module. IC Role / Device Role / Timing Role: High-accuracy front-end converter with internal reference and FIFO-driven scan mode for deterministic data capture. Use Value: ±1 LSB INL enables sub-0.1% measurement accuracy; 4.096V reference matches standard 12-bit scaling for seamless firmware integration. |
| Battery Management System (BMS) | Portable Medical Instrument |
Use Scenario: Sampling cell voltages and pack temperature in a 12S Li-ion battery stack for state-of-charge estimation. IC Role / Device Role / Timing Role: Precision ADC with low supply current and programmable scan sequence for periodic cell balancing checks. Use Value: 6µA at 1ksps extends runtime in sleep-mode monitoring; 5MHz analog bandwidth supports accurate transient detection during charge/discharge events. |
Use Scenario: Digitizing ECG leads, pulse oximeter photodiode outputs, and patient temperature in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-power ADC interfacing with analog front-end amplifiers and delivering clean data via I²C to ARM Cortex-M host. Use Value: 70dB SINAD and -78dB THD preserve signal integrity for clinical-grade waveform analysis; QSOP-16 footprint fits tight medical enclosure constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 16-channel, SPI interface, 2.7–5.25V supply, 1.25ms conversion time, no internal reference. | Requires external reference and SPI host; better suited for high-throughput deterministic timing but lacks I²C simplicity. | Choose when SPI infrastructure exists and precise timing control outweighs I²C convenience. |
| AD7949BCPZ-RL7 | 14-bit, 8-channel, SPI interface, 2.3–5.5V supply, 1.25µs conversion time, internal reference optional. | Higher resolution but fewer channels; faster conversion but higher power (2.5mA typical); no AutoShutdown. | Choose when 14-bit resolution is mandatory and channel count can be reduced via external multiplexing. |
Compared with ADS7953IRHBT and AD7949BCPZ-RL7, the MAX1238EEE/V+T offers unique integration of automotive qualification, I²C simplicity, internal 4.096V reference, and ultra-low quiescent current-making it optimal for cost-sensitive, space-constrained, and battery-aware 12-channel sensing where SPI overhead or higher resolution is unnecessary.
Availability
MAX1238EEE/V+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor hubs, battery management systems, and portable medical instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1238EEE/V+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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX1236–MAX1239 family targets low-power, multichannel data acquisition in resource-constrained environments-emphasizing integration (reference, T/H, clock, I²C), small footprint, and robust operation across harsh temperature ranges.
FAQ
What is the operating temperature range for MAX1238EEE/V+T?
The MAX1238EEE/V+T is qualified for operation from -40°C to +85°C. The "/V" suffix explicitly denotes automotive qualification per AEC-Q100 stress test requirements, making it suitable for under-hood and cabin electronics where thermal stability is critical. This rating is guaranteed across all electrical specifications in the datasheet.
Does MAX1238EEE/V+T require an external crystal or clock source?
No, the MAX1238EEE/V+T includes an internal oscillator and operates in internal clock mode by default. It supports external clock mode for synchronization with system timing, but no crystal or external clock generator is required for basic operation. The internal clock enables immediate functionality with minimal external components.
How many analog input channels does MAX1238EEE/V+T support, and how are they configured?
The MAX1238EEE/V+T supports 12 analog input channels (AIN0–AIN11). Configuration is software-controlled via I²C: channels can be used in single-ended mode (12 inputs referenced to GND) or fully differential mode (6 independent differential pairs), with unipolar or bipolar range selection per mode-all set through the device's setup and configuration registers.
What is the purpose of the AIN11/REF pin on MAX1238EEE/V+T?
The AIN11/REF pin (Pin 13) serves a dual function: it acts as the 12th analog input (AIN11) in single-ended mode or as the reference input/output terminal. When configured as REF, it sources or sinks the internal 4.096V reference or accepts an external 1V–VDD reference voltage-providing flexibility for precision scaling without adding external reference ICs.
Is MAX1238EEE/V+T pin-compatible with other devices in the MAX1236–MAX1239 family?
Yes, the MAX1238EEE/V+T shares identical pinout and package (16-pin QSOP) with MAX1238EEE+, MAX1239EEE+, and MAX1239EEE/V+. This allows direct substitution within the same footprint when migrating between 4.096V/5V (MAX1238) and 2.048V/3.3V (MAX1239) variants, provided supply voltage and reference requirements are verified.
MAX1238EEE/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 94.4k
- Number of Inputs:
- 6, 12
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1238EEE/V+T FAQ
1.How can I place an order for MAX1238EEE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1238EEE/V+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 MAX1238EEE/V+T reliable?
The price and inventory of MAX1238EEE/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1238EEE/V+T is usually 5 days.
3.What payment methods are accepted for MAX1238EEE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1238EEE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1238EEE/V+T?
MAX1238EEE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1238EEE/V+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 MAX1238EEE/V+T?
For technical support, including MAX1238EEE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1238EEE/V+T requirements.
6.How does Aetrix verify that MAX1238EEE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX1238EEE/V+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 MAX1238EEE/V+T meets industry standards.
7.What is the process for return or replacement of MAX1238EEE/V+T?
All MAX1238EEE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1238EEE/V+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 MAX1238EEE/V+T part is unused and in its original packaging.
Return procedure for MAX1238EEE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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