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Analog Devices Inc./Maxim Integrated MAX1138EEE+T
- Part No.:
- MAX1138EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1138EEE+T.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
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Product details
Overview
MAX1138EEE+T 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+T datasheet, MAX1138EEE+T pinout, MAX1138EEE+T application, or MAX1138EEE+T equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support tailored for battery-powered medical instruments, solar-remote monitoring, and RSSI systems requiring stable, low-quiescent ADCs with guaranteed -40°C to +85°C operation.
Technical Context
The MAX1138EEE+T implements successive-approximation architecture with fully differential track/hold circuitry and an internal 4.096V reference optimized for 4.5V–5.5V supply operation. Its 2-wire interface supports both Fast Mode (400kHz) and High-Speed Mode (1.7MHz), enabling up to 94.4ksps sampling with programmable channel-scan FIFO.
It features 12 analog input terminals (AIN0–AIN11), configurable as 12 single-ended or 6 fully differential channels, with ±1 LSB INL/DNL accuracy, 60dB SINAD at 10kHz, and 3MHz full-power bandwidth - all while maintaining sub-1µA shutdown current via AutoShutdown™.
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 without external multiplexers. |
| Internal Reference | 4.096V - provides stable, factory-trimmed scaling for full-scale input range; eliminates need for external reference in many designs. |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V logic rails and industrial power domains. |
| Sampling Rate | 94.4ksps max - sufficient for audio-band signals, motor control feedback, and transient event capture. |
| INL / DNL | ±1 LSB - ensures monotonicity and predictable code transitions across temperature (-40°C to +85°C). |
| Supply Current | 670µA at 94.4ksps; 0.5µA in shutdown - enables ultra-low-power operation in intermittent-sampling systems. |
Pinout & Package
The MAX1138EEE+T is housed in a 16-pin QSOP package (lead-free, RoHS-compliant), with 12 analog input pins, 2 serial interface pins (SCL/SDA), VDD, and GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 4–8, 14–16 | AIN0–AIN11 | 12 analog input terminals - configurable as single-ended or differential pairs; support ±VREF/2 bipolar or 0–VREF unipolar ranges. |
| 4 (AIN3/REF) | Configurable analog input / reference I/O | Shared terminal usable as AIN3 or reference output/input depending on Setup Register configuration (SEL[2:1]=11). |
| 13 (AIN11/REF) | Configurable analog input / reference I/O | Shared terminal usable as AIN11 or reference output/input depending on Setup Register configuration (SEL[2:1]=11). |
| 5 | SCL | Serial clock input - controls data timing for I²C-compatible 2-wire interface; supports Fast Mode (400kHz) and High-Speed Mode (1.7MHz). |
| 6 | SDA | Serial data I/O - bidirectional line for setup byte, configuration byte, and conversion result transfer. |
| 7 | GND | Analog/digital ground reference - must be connected to system ground plane with low-impedance path. |
| 8 | VDD | Positive supply input - requires 0.1µF bypass capacitor to GND for noise suppression and stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <1µA between conversions - extends battery life in handheld and remote systems. |
| I²C-Compatible 2-Wire Interface | Supports 400kHz Fast Mode and 1.7MHz High-Speed Mode - simplifies host MCU integration with minimal GPIO usage. |
| Internal Track/Hold & Clock | Eliminates need for external sample-hold circuitry and timing components - reduces BOM count and layout complexity. |
| Software-Configurable Input Modes | Single-ended/differential and unipolar/bipolar selection via setup/configuration bytes - enables flexible signal conditioning per channel. |
| Internal FIFO with Channel-Scan Mode | Automatically sequences through selected input channels - ideal for periodic multi-sensor polling without host intervention. |
Applications
| Medical Instrumentation | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: Portable ECG or blood glucose meter acquiring analog biosignals from multiple electrodes or sensors. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog front-end outputs with precise 4.096V reference scaling and low-noise performance. Use Value: 12-channel capability enables simultaneous lead acquisition; 670µA active current and AutoShutdown™ extend battery runtime beyond 24 hours on coin-cell power. |
Use Scenario: Handheld multimeter or insulation tester measuring voltage, current, and resistance across multiple test points. IC Role / Device Role / Timing Role: Central ADC interfacing with analog multiplexer and precision shunt/sense circuits under microcontroller control. Use Value: Configurable unipolar/bipolar and single-ended/differential modes accommodate diverse sensor types; 1.7MHz I²C interface accelerates measurement cycles. |
| Solar-Powered Remote Systems | Received-Signal-Strength Indicators |
|
Use Scenario: Off-grid environmental monitor logging temperature, humidity, and solar irradiance using energy-harvesting power. IC Role / Device Role / Timing Role: Low-power ADC converting sensor outputs during brief wake-up windows to minimize energy consumption. Use Value: Sub-1µA shutdown current and programmable scan mode allow duty-cycled operation; 4.5V–5.5V supply matches supercapacitor or LiFePO₄ battery output. |
Use Scenario: Cellular/Wi-Fi module reporting RF signal strength (RSSI) across multiple frequency bands or antennas. IC Role / Device Role / Timing Role: ADC digitizing logarithmic detector outputs or baseband IQ amplitude signals for digital RSSI calculation. Use Value: 60dB SINAD and 70dB SFDR ensure accurate amplitude resolution; 12-channel support allows concurrent RSSI sampling across antenna arrays. |
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 12-channel architecture but with 2.048V internal reference and 2.7V–3.6V supply range. | Optimized for 3.3V systems and lower-voltage battery operation; not suitable for 5V rail environments. | Select MAX1139EEE+ only when operating from 2.7V–3.6V and requiring 2.048V reference scaling. |
| ADS7822U | 12-bit, 4-channel, SPI interface, 2.7V–5.25V supply, no internal reference - requires external REF. | Lacks integrated reference and channel count; higher resolution but less integration and no AutoShutdown™. | Choose ADS7822U when 12-bit resolution is mandatory and SPI is preferred over I²C, accepting added BOM and layout overhead. |
Compared with MAX1139EEE+, the MAX1138EEE+T offers higher full-scale range and 5V compatibility; compared with ADS7822U, it delivers greater integration, lower power, and simpler interface at the cost of 2-bit resolution - making it optimal for cost-sensitive, battery-constrained 10-bit sensor systems.
Availability
MAX1138EEE+T is available at Aetrix Electronics and suitable for medical instrumentation, battery-powered test equipment, and solar-powered remote systems requiring stable component supply with guaranteed extended temperature operation (-40°C to +85°C).
Supply support for MAX1138EEE+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 applications.
The MAX1136–MAX1139 family was designed for low-power, multichannel data acquisition in portable and remote systems - emphasizing integration (reference, T/H, clock, I²C), wide supply range, and guaranteed performance across industrial temperature extremes.
FAQ
What is the internal reference voltage of the MAX1138EEE+T?
The MAX1138EEE+T features a factory-trimmed 4.096V internal reference, specified from 3.939V to 4.256V over temperature. This reference sets the full-scale input range for analog conversions and eliminates the need for external reference components in most applications. The MAX1138EEE+T does not support internal reference voltages other than 4.096V - unlike the MAX1139EEE+, which uses 2.048V.
Does the MAX1138EEE+T support differential input mode?
Yes, the MAX1138EEE+T supports fully differential input operation across six channel pairs (e.g., AIN0–AIN1, AIN2–AIN3, etc.) when configured via the SGL/DIF bit in the configuration byte. In differential mode, it accepts bipolar inputs up to ±VREF/2 (±2.048V) and outputs two's complement codes. This capability is confirmed in the device's functional diagram, timing tables, and electrical characteristics section.
What is the maximum sampling rate of the MAX1138EEE+T?
The MAX1138EEE+T achieves a maximum sampling rate of 94.4ksps when operating in High-Speed Mode (1.7MHz I²C clock) with external clocking. At this rate, typical supply current is 670µA. Lower rates (e.g., 40ksps, 10ksps, 1ksps) reduce current to 230µA, 60µA, and 6µA respectively - enabling adaptive power management in battery-operated systems.
Is the MAX1138EEE+T pin-compatible with any 12-bit ADC alternatives?
No, the MAX1138EEE+T is not pin-compatible with 12-bit alternatives. The datasheet explicitly states that pin-compatible 12-bit variants are the MAX1238/MAX1239 - which share identical 16-pin QSOP packaging and pin functions but differ in resolution, reference, and performance specs. Direct substitution with MAX1238/MAX1239 requires validation of timing, reference, and firmware compatibility.
What package type and RoHS status does the MAX1138EEE+T have?
The MAX1138EEE+T is supplied in a 16-pin QSOP package and is lead(Pb)-free and RoHS-compliant, as indicated by the "+" suffix in the part number. The ordering information table confirms "16 QSOP" for MAX1138EEE+, and the datasheet notes "+Denotes a lead(Pb)-free/RoHS-compliant package." Thermal and mechanical specifications align with standard QSOP footprint and reflow profiles.
MAX1138EEE+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:
- 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+T FAQ
1.How can I place an order for MAX1138EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1138EEE+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 MAX1138EEE+T reliable?
The price and inventory of MAX1138EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1138EEE+T is usually 5 days.
3.What payment methods are accepted for MAX1138EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1138EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1138EEE+T?
MAX1138EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1138EEE+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 MAX1138EEE+T?
For technical support, including MAX1138EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1138EEE+T requirements.
6.How does Aetrix verify that MAX1138EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1138EEE+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 MAX1138EEE+T meets industry standards.
7.What is the process for return or replacement of MAX1138EEE+T?
All MAX1138EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1138EEE+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 MAX1138EEE+T part is unused and in its original packaging.
Return procedure for MAX1138EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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