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Analog Devices Inc./Maxim Integrated MAX1138EEE+
- Part No.:
- MAX1138EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1138EEE+.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:114
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Product details
Overview
MAX1138EEE+ from Maxim Integrated is a 10-bit, 12-channel, low-power analog-to-digital converter (ADC) with integrated track/hold, 4.096V internal reference, I²C-compatible 2-wire serial interface, and operation from 4.5V to 5.5V single supply. It delivers 94.4ksps throughput with 670µA supply current and supports software-configurable unipolar/bipolar, single-ended/differential inputs for precision sensor digitization in portable instrumentation.
For engineers reviewing the MAX1138EEE+ datasheet, MAX1138EEE+ pinout, MAX1138EEE+ application, or MAX1138EEE+ equivalent, this page provides verified technical context, validated pin functions, confirmed 16-pin QSOP package mapping, real-world use cases in battery-powered test equipment and solar-remote systems, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The MAX1138EEE+ employs successive-approximation architecture with fully differential track/hold circuitry and an internal 2.8MHz oscillator. Its 12-channel analog multiplexer supports channel-scan mode with internal FIFO, enabling automated sequential conversions without host intervention.
It implements a high-speed I²C interface with dual-mode timing: Fast Mode (400kHz) and High-Speed Mode (1.7MHz), where bus mode selection is performed via dedicated HS-mode master code (00001XXX). The device uses software-configurable setup and configuration registers to define input polarity, range, channel selection, and reference source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for moderate-precision measurement applications. |
| Input Channels | 12 single-ended or 6 fully differential - enables multi-sensor monitoring from one IC without external muxing. |
| Internal Reference | 4.096V - provides stable full-scale range matching common DACs and simplifies calibration in 5V systems. |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V logic rails and industrial power domains. |
| Sampling Rate | 94.4ksps - supports real-time capture of audio-band and control-loop signals (e.g., motor feedback, vibration). |
| INL / DNL | ±1 LSB - ensures monotonicity and ≤0.1% full-scale linearity error across -40°C to +85°C. |
| Power Consumption | 670µA at 94.4ksps; <1µA in AutoShutdown™ - extends battery life in handheld medical instruments and remote sensors. |
Pinout & Package
The MAX1138EEE+ is housed in a 16-pin QSOP (Quarter-Size Outline Package) with 0.154" body width and 0.025" lead pitch, optimized for compact PCB layouts in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 4–8, 14–16 | AIN0–AIN10 / AIN11/REF | 12 analog input terminals; AIN11/REF serves dual role as channel 11 input or reference voltage I/O depending on setup register. |
| 5 | SCL | I²C clock input - controls data transfer timing; supports both Fast Mode (400kHz) and High-Speed Mode (1.7MHz). |
| 6 | SDA | I²C bidirectional data line - carries setup bytes, configuration commands, and 10-bit conversion results. |
| 7 | GND | Analog and digital ground reference - must be connected to low-impedance system ground plane to maintain ADC accuracy. |
| 8 | VDD | Positive supply input - requires local 0.1µF ceramic bypass capacitor to GND for noise suppression. |
| 9–13 | No Connect | Internally unused pins - must remain floating; no external connection or pull-up/down required. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <1µA between conversions - eliminates need for external enable control in low-duty-cycle sensing. |
| Software-Configurable Input Modes | Single-ended/differential and unipolar/bipolar selection via setup byte - enables reuse across diverse sensor types (thermocouples, RTDs, pressure bridges) without hardware change. |
| Internal FIFO with Channel-Scan Mode | Automates sequential sampling of up to 12 channels - offloads microcontroller polling and ensures deterministic timing in real-time systems. |
| Integrated Track/Hold & Reference | Eliminates external T/H amplifier and reference IC - reduces BOM count, board area, and calibration complexity in portable designs. |
| High-Speed I²C Interface | 1.7MHz operation with HS-mode master code handshake - enables fast data streaming while maintaining compatibility with legacy 400kHz controllers. |
Applications
| Medical Instrumentation | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: Portable blood glucose meter acquiring analog signals from electrochemical sensor strips. IC Role / Device Role / Timing Role: Precision 10-bit digitization of low-current sensor outputs with auto-scan across multiple calibration channels. Use Value: 4.096V internal reference ensures consistent full-scale scaling across batches; 670µA active current extends AA-battery life to >6 months at 1 reading/hour. |
Use Scenario: Handheld multimeter measuring voltage, current, and resistance across multiple ranges. IC Role / Device Role / Timing Role: 12-channel ADC multiplexing analog front-end signals (shunt voltages, divider taps, thermistor nodes) under firmware control. Use Value: Software-configurable bipolar/unipolar mode allows same hardware to support AC RMS and DC measurements; internal FIFO reduces MCU interrupt load during auto-ranging. |
| Solar-Powered Remote Systems | Received-Signal-Strength Indicators |
|
Use Scenario: Off-grid environmental monitor logging temperature, humidity, and solar irradiance using energy-harvesting PMIC. IC Role / Device Role / Timing Role: Low-quiescent ADC digitizing sensor outputs during brief wake-up windows to minimize energy per sample. Use Value: AutoShutdown™ cuts idle current to <1µA - critical for operation on µW-level harvested power; 4.5–5.5V supply range matches supercapacitor storage voltage. |
Use Scenario: Cellular IoT module reporting LTE/5G signal quality metrics to cloud platform. IC Role / Device Role / Timing Role: Digitizing RSSI voltage from RF transceiver's analog output pin for accurate link budget analysis. Use Value: ±1 LSB INL ensures <0.1dB RSSI resolution over temperature; 5MHz analog bandwidth captures fast signal fluctuations during handover events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1139EEE+ | Same 16-pin QSOP package and pinout; 2.048V internal reference; 2.7–3.6V supply range. | Optimized for 3.3V systems (e.g., ARM Cortex-M microcontrollers); lower supply voltage limits max input range but improves power efficiency. | Select MAX1139EEE+ when operating from 3.3V rail and interfacing with 2.048V-referenced DACs or sensors. |
| ADS7822U | 8-pin SOIC; SPI interface; 2.7–5.25V supply; 100ksps; no internal reference - requires external 2.5V reference. | Lacks I²C compatibility and integrated reference; higher layout complexity due to external reference and decoupling needs. | Choose ADS7822U only if SPI is preferred over I²C and board space permits external reference design. |
Compared with MAX1138EEE+, MAX1139EEE+ offers identical functionality in 3.3V domains with lower supply current at equivalent throughput, while ADS7822U trades integration for interface flexibility and slightly higher speed - neither is pin-compatible, but both serve overlapping measurement roles with distinct system-level trade-offs.
Availability
MAX1138EEE+ is available at Aetrix Electronics and suitable for battery-powered test equipment, solar-powered remote systems, and medical instrumentation requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX1138EEE+ 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 applications.
The MAX1136–MAX1139 family was designed for ultra-low-power, multichannel data acquisition in portable and energy-constrained systems - emphasizing integration of reference, T/H, clock, and I²C interface in minimal footprint.
FAQ
What is the internal reference voltage of the MAX1138EEE+?
The MAX1138EEE+ features a factory-trimmed 4.096V internal reference, specified from 3.939V to 4.256V over temperature and supply. This reference sets the full-scale input range and is accessible at the AIN11/REF pin when configured via the setup register. It eliminates the need for external reference components in 5V-system designs.
Does the MAX1138EEE+ support differential input mode?
Yes, the MAX1138EEE+ supports fully differential input operation via software configuration of the SGL/DIF bit in the configuration byte. In differential mode, it accepts paired inputs (e.g., AIN0+/AIN0−) across six channel pairs, delivering 10-bit two's complement output with ±VREF/2 range when bipolar mode is enabled.
What package type is used for the MAX1138EEE+?
The MAX1138EEE+ is supplied in a 16-pin QSOP (Quarter-Size Outline Package) with 0.154" body width and standard 0.025" lead pitch. This surface-mount package is RoHS-compliant (+ suffix), rated for operation from −40°C to +85°C, and compatible with automated PCB assembly processes.
How does the AutoShutdown™ feature reduce power in the MAX1138EEE+?
AutoShutdown™ automatically powers down the MAX1138EEE+'s analog core and reference between conversions, reducing supply current to less than 1µA at low throughput rates. This occurs without external control signals - the feature is inherent to the device's conversion sequencing logic and requires no firmware intervention.
Can the MAX1138EEE+ operate with an external reference voltage?
Yes, the MAX1138EEE+ accepts an external reference voltage from 1V to VDD applied at the AIN11/REF pin. When enabled, the internal 4.096V reference is disabled. External referencing allows customization of full-scale range (e.g., 2.5V for compatibility with other system components) and improves overall system accuracy when a higher-stability reference is used.
MAX1138EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 94.4k
- Number of Inputs:
- 6, 12
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- Configuration:
- MUX-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:
- -
MAX1138EEE+ FAQ
1.How can I place an order for MAX1138EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1138EEE+ 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 MAX1138EEE+ reliable?
The price and inventory of MAX1138EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1138EEE+ is usually 5 days.
3.What payment methods are accepted for MAX1138EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1138EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1138EEE+?
MAX1138EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1138EEE+ 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 MAX1138EEE+?
For technical support, including MAX1138EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1138EEE+ requirements.
6.How does Aetrix verify that MAX1138EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1138EEE+ 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 MAX1138EEE+ meets industry standards.
7.What is the process for return or replacement of MAX1138EEE+?
All MAX1138EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1138EEE+, 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 MAX1138EEE+ part is unused and in its original packaging.
Return procedure for MAX1138EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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