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Analog Devices Inc./Maxim Integrated MAX1238MEEE+T
- Part No.:
- MAX1238MEEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1238MEEE+T.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,401
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Product details
Overview
The MAX1238MEEE+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, and consumes only 670µA at max rate while supporting software-configurable unipolar/bipolar and single-ended/differential input modes - used in battery-powered test equipment and system supervision circuits.
For engineers reviewing the MAX1238MEEE+T datasheet, MAX1238MEEE+T pinout, MAX1238MEEE+T application, or MAX1238MEEE+T equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to the MAX1238MEEE+T.
Technical Context
The MAX1238MEEE+T implements successive-approximation ADC architecture with fully differential track/hold circuitry and an integrated 2.8MHz internal clock. Its 12-channel analog multiplexer supports channel-scan mode with FIFO buffering and allows per-channel configuration of input polarity and topology via setup and configuration registers.
It operates exclusively in I²C Fast Mode (400kHz) or High-Speed Mode (1.7MHz), requiring explicit HS-mode master code (00001XXX) activation. The device uses a switched-capacitor DAC for conversion and features programmable acquisition timing tied to SCL frequency - tACQ = 2/fSCL in external clock mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale range for precision measurement applications. |
| Input Channels | 12 single-ended or 6 fully differential - enables multi-sensor monitoring without external mux in compact systems. |
| Throughput Rate | 94.4ksps - supports real-time sampling of signals up to ~3MHz bandwidth (full-power) in undersampling use cases. |
| INL / DNL | ±1 LSB / ±1 LSB - ensures monotonicity and <0.025% full-scale linearity error after calibration, critical for closed-loop control. |
| Supply Current | 670µA at 94.4ksps, 6µA at 1ksps - AutoShutdown™ reduces current by >100× during low-activity periods to extend battery life. |
| Reference Voltage | 4.096V internal (±2% over temp) - matches standard 12-bit full-scale resolution (1 LSB = 1mV), simplifying voltage-scaling design. |
| I²C Interface | Supports Fast Mode (400kHz) and High-Speed Mode (1.7MHz) - enables rapid register access and burst data reads without MCU polling overhead. |
Pinout & Package
The MAX1238MEEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained industrial and portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 4–8, 14–16 | AIN0–AIN10 | Analog input channels - pins 1–3 and 4–8 map to AIN0–AIN7; pins 14–16 are AIN8–AIN10 (see Pin Description table). |
| 13 | AIN11/REF | Configurable terminal - serves as analog input 11 or reference output/input depending on SEL[2:1] register setting. |
| 9 | SCL | I²C clock input - controls timing of all serial transfers; must be pulled high externally; supports 1.7MHz HS-mode. |
| 10 | SDA | I²C bidirectional data line - requires external pull-up; handles address, setup byte, and 12-bit conversion result transfer. |
| 11 | GND | Analog/digital ground reference - must be connected to low-impedance system ground plane to maintain DC accuracy and noise immunity. |
| 12 | VDD | Positive supply - accepts 4.5V–5.5V; requires local 0.1µF ceramic bypass capacitor placed adjacent to pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Internal FIFO with Channel-Scan Mode | Enables automatic sequential conversion across all 12 channels without host intervention - reduces firmware overhead and jitter in periodic monitoring. |
| Software-Configurable Input Topology | Single-ended/differential and unipolar/bipolar modes selected via setup register - eliminates need for external signal conditioning components in mixed-signal systems. |
| Low-Power AutoShutdown™ | Reduces supply current to <1µA between conversions - extends operational lifetime in solar-powered remote sensors and handheld instruments. |
| Integrated Track/Hold + Reference | Removes requirement for external T/H amplifier and precision reference IC - cuts BOM count and layout area in space-sensitive designs. |
| 5MHz Analog Input Bandwidth | Supports accurate digitization of fast transients and RF envelope detection using undersampling techniques - useful in RSSI and power-monitoring applications. |
Applications
| Handheld Portable Applications | Medical Instruments |
|---|---|
Use Scenario: Battery-powered multimeter with 12-sensor front-end (temperature, voltage, current, humidity). IC Role / Device Role / Timing Role: Primary ADC acquiring synchronized readings from multiple analog sources via channel-scan mode. Use Value: Single MAX1238MEEE+T replaces discrete mux + ADC solution, reducing component count and enabling 94.4ksps burst capture for transient analysis. |
Use Scenario: Portable ECG monitor measuring lead voltages and battery level simultaneously. IC Role / Device Role / Timing Role: 12-bit precision ADC digitizing differential biopotential signals with software-selectable gain and offset compensation. Use Value: Internal 4.096V reference and ±1 LSB INL ensure clinical-grade amplitude fidelity; low 670µA active current extends operating time per charge. |
| Battery-Powered Test Equipment | System Supervision |
Use Scenario: Field-deployable power analyzer logging AC line parameters and thermal sensor data. IC Role / Device Role / Timing Role: Multi-channel ADC interfacing with isolated current/voltage sensors and ambient temperature/humidity ICs. Use Value: I²C High-Speed Mode (1.7MHz) enables rapid register writes and 12-bit result reads - minimizing bus occupancy during concurrent sensor polling. |
Use Scenario: Industrial PLC module monitoring rail voltages, fan tachometers, and board temperature zones. IC Role / Device Role / Timing Role: System health monitor ADC scanning 12 analog inputs at 1ksps with AutoShutdown™ between cycles. Use Value: 6µA standby current and guaranteed -40°C to +85°C operation ensure reliable long-term supervision in uncontrolled environments. |
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, 2.7V–5.25V supply, no internal reference - requires external 4.096V ref. | Higher channel count but lacks I²C compatibility and integrated reference - demands additional ref IC and level-shifting for 5V systems. | Choose when SPI-native microcontroller integration or >12 channels outweigh I²C convenience and reference integration. |
| MAX1138EEE+ | 10-bit, 12-channel, I²C-compatible, 4.5V–5.5V supply, 4.096V internal ref, 100ksps - lower resolution, same package. | Same footprint and interface but reduced dynamic range - suitable where 10-bit resolution suffices and cost sensitivity is high. | Choose for legacy drop-in replacement where 10-bit accuracy meets system requirements and BOM cost reduction is prioritized. |
Compared with ADS7953IRHBT and MAX1138EEE+, the MAX1238MEEE+T uniquely combines I²C simplicity, integrated 4.096V reference, and 12-bit precision in a 16-pin QSOP - eliminating external components while maintaining compatibility with resource-constrained microcontrollers.
Availability
The MAX1238MEEE+T is available at Aetrix Electronics and suitable for battery-powered test equipment, handheld portable applications, and system supervision requiring stable component supply, guaranteed -40°C to +85°C operation, and long-term production continuity.
Supply support for MAX1238MEEE+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX1236–MAX1239 family was designed for low-power, multichannel data acquisition in space- and energy-constrained systems - emphasizing integration of reference, clock, T/H, and I²C interface in minimal footprint packages.
FAQ
What is the maximum sampling rate supported by the MAX1238MEEE+T?
The MAX1238MEEE+T achieves a maximum throughput rate of 94.4ksps when operating in I²C High-Speed Mode (1.7MHz) with external clocking. This rate is sustained under full-load conditions (12-channel scan, internal reference enabled) and corresponds to a conversion time of 10.6µs per sample. Performance remains stable across the full -40°C to +85°C temperature range.
Does the MAX1238MEEE+T require an external reference voltage?
No, the MAX1238MEEE+T includes a factory-trimmed 4.096V internal reference with ±2% accuracy over temperature and 25ppm/°C drift - sufficient for most 12-bit applications. An external reference (1V to VDD) may be applied at the AIN11/REF pin if higher initial accuracy or custom scaling is required, but doing so disables the internal reference output.
How many analog input channels does the MAX1238MEEE+T support, and how are they configured?
The MAX1238MEEE+T supports 12 analog input channels (AIN0–AIN11), configurable as either 12 single-ended inputs or 6 fully differential pairs. Configuration is controlled via the SGL/DIF bit in the setup register and channel selection bits (CS[3:0]) - all managed through the I²C interface without hardware changes.
What package type and pin count does the MAX1238MEEE+T use?
The MAX1238MEEE+T is supplied in a 16-pin QSOP package (5.3mm × 10.2mm body, 0.65mm lead pitch) with exposed pad option not present. This RoHS-compliant, lead-free package is compatible with standard surface-mount assembly processes and provides thermal and mechanical stability for industrial deployments.
Can the MAX1238MEEE+T operate from a 3.3V supply?
No - the MAX1238MEEE+T is specified only for 4.5V to 5.5V single-supply operation. For 2.7V–3.6V systems, the pin-compatible MAX1239EEE+ (same 12-channel architecture, 2.048V internal reference) should be used instead. Attempting to power the MAX1238MEEE+T below 4.5V risks functional failure and violates Absolute Maximum Ratings.
MAX1238MEEE+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:
- -
MAX1238MEEE+T FAQ
1.How can I place an order for MAX1238MEEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1238MEEE+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 MAX1238MEEE+T reliable?
The price and inventory of MAX1238MEEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1238MEEE+T is usually 5 days.
3.What payment methods are accepted for MAX1238MEEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1238MEEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1238MEEE+T?
MAX1238MEEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1238MEEE+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 MAX1238MEEE+T?
For technical support, including MAX1238MEEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1238MEEE+T requirements.
6.How does Aetrix verify that MAX1238MEEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1238MEEE+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 MAX1238MEEE+T meets industry standards.
7.What is the process for return or replacement of MAX1238MEEE+T?
All MAX1238MEEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1238MEEE+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 MAX1238MEEE+T part is unused and in its original packaging.
Return procedure for MAX1238MEEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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