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Analog Devices Inc./Maxim Integrated MAX1138KEEE+
- Part No.:
- MAX1138KEEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1138KEEE+.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,946
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Product details
Overview
MAX1138KEEE+ 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 MAX1138KEEE+ datasheet, MAX1138KEEE+ pinout, MAX1138KEEE+ application, or MAX1138KEEE+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for volume deployment in battery-constrained systems.
Technical Context
The MAX1138KEEE+ uses 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 conversion across AIN0–AIN11.
It implements a high-speed 2-wire interface compliant with I²C Fast Mode (400kHz) and High-Speed Mode (1.7MHz), requiring explicit HS-mode entry via master code 00001XXX. The device features AutoShutdown™, reducing current to <1µA between conversions at low throughput rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes for moderate-precision measurement without oversampling complexity. |
| Input Channels | 12 single-ended or 6 fully differential - enables multi-sensor monitoring (e.g., temperature, voltage, current) from one IC in compact layouts. |
| Internal Reference | 4.096V - provides stable full-scale range matching common microcontroller ADC references and simplifies calibration traceability. |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V logic rails and industrial power supplies, eliminating need for LDO regulation. |
| Sampling Rate | 94.4ksps - supports Nyquist sampling of signals up to ~47kHz, sufficient for audio-band diagnostics and fast transient capture. |
| INL / DNL | ±1 LSB - ensures monotonicity and ≤0.1% end-point linearity error across temperature, critical for closed-loop control feedback accuracy. |
| Power Consumption | 670µA at 94.4ksps; 6µA at 1ksps - enables >1-year battery life in solar-powered remote sensors operating at low duty cycles. |
Pinout & Package
MAX1138KEEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained portable PCBs and compatible with standard reflow profiles.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 4–8, 14–16 | AIN0–AIN11 | Analog input terminals - support software-selectable single-ended or differential pairing; AIN3/REF and AIN11/REF double as reference I/O. |
| 5 | SCL | Serial clock input - controls data timing for both Fast Mode (400kHz) and High-Speed Mode (1.7MHz); requires external pull-up. |
| 6 | SDA | Serial data I/O - bidirectional line for configuration writes and conversion result reads; open-drain, requires pull-up. |
| 7 | GND | Analog/digital ground reference - must be connected to low-impedance system ground plane to minimize noise coupling into T/H node. |
| 8 | VDD | Positive supply - bypassed with 0.1µF ceramic capacitor directly to GND to suppress switching noise affecting reference stability. |
| 9–13 | No Connect | Internally unused pins - left floating per datasheet; no routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| I²C-Compatible 2-Wire Interface | Supports 400kHz Fast Mode and 1.7MHz High-Speed Mode - reduces MCU GPIO count and simplifies firmware integration versus SPI alternatives. |
| Software-Configurable Input Modes | Single-ended/differential and unipolar/bipolar selection via setup byte - eliminates external signal conditioning components for diverse sensor types. |
| Internal Track/Hold + Reference | Eliminates need for external sample-hold amplifier and precision reference IC - cuts BOM cost and board area by ≥3 components. |
| AutoShutdown™ Power Management | Reduces idle current to <1µA - extends battery life in intermittent-read applications like environmental monitors without external enable control. |
| Channel-Scan FIFO | Automatically sequences through up to 12 channels with auto-incrementing address - enables synchronized multi-parameter acquisition with minimal host intervention. |
Applications
| Medical Instrumentation | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Portable blood glucose meter acquiring analog output from electrochemical sensor strips. IC Role / Device Role / Timing Role: Primary ADC digitizing low-level mV-range sensor currents with 10-bit resolution and 4.096V reference for calibrated concentration calculation. Use Value: 12-channel capability allows simultaneous calibration against multiple reference electrodes, improving assay repeatability without added ICs. |
Use Scenario: Handheld multimeter measuring AC/DC voltage, current, and resistance across multiple ranges. IC Role / Device Role / Timing Role: Central ADC handling multiplexed front-end signals with programmable gain and bipolar input support for true RMS computation. Use Value: Internal 4.096V reference ensures consistent full-scale definition across ranges, eliminating drift-induced zero-error in field calibration. |
| Solar-Powered Remote Systems | Received-Signal-Strength Indicators |
Use Scenario: Off-grid weather station logging temperature, humidity, and solar irradiance using analog-output sensors. IC Role / Device Role / Timing Role: Low-power ADC performing scheduled 1-minute interval conversions on 12 sensor nodes powered by LiFePO₄ battery + solar charge controller. Use Value: 6µA standby current at 1ksps enables >2-year operation on 2000mAh battery, avoiding frequent maintenance in inaccessible locations. |
Use Scenario: Cellular base station subsystem monitoring RF front-end amplifier output power via directional coupler DC voltage. IC Role / Device Role / Timing Role: Dedicated RSSI ADC converting coupled RF detector voltage into digital signal for AGC loop control and fault detection. Use Value: 5MHz analog input bandwidth supports accurate peak-hold emulation for pulsed RF signals, improving dynamic range over slower ADCs. |
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 2.048V internal reference and 2.7V–3.6V supply range - lower headroom for 5V systems. | Optimized for 3.3V battery-powered devices; unsuitable where 4.5V+ supply or 4.096V reference alignment is required. | Select MAX1139EEE+ only when operating from 3.3V rail and matching legacy 2.048V reference ecosystems. |
| ADS7953IRHBT | 12-bit resolution, SPI interface, 2.7V–5.25V supply, no internal reference - higher precision but requires external ref and more GPIOs. | Used in industrial PLC modules needing higher resolution; lacks AutoShutdown and I²C simplicity for portable use. | Choose ADS7953IRHBT when 12-bit accuracy and SPI timing control outweigh I²C convenience and ultra-low sleep current. |
Compared with MAX1139EEE+, MAX1138KEEE+ provides higher full-scale voltage margin and direct compatibility with 5V microcontrollers; compared with ADS7953IRHBT, it trades resolution for lower system-level power, smaller footprint, and simplified firmware stack - making it optimal for size- and battery-limited handheld instruments.
Availability
MAX1138KEEE+ 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 performance (-40°C to +85°C).
Supply support for MAX1138KEEE+ 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 MAX1136–MAX1139 family targets portable and energy-conscious systems requiring multichannel data acquisition with minimal external components and ultra-low quiescent current.
FAQ
What is the maximum sampling rate of the MAX1138KEEE+ and under what conditions is it achieved?
The MAX1138KEEE+ achieves a maximum sampling rate of 94.4ksps when operating in High-Speed Mode (HS-mode) with an external clock and 4.5V–5.5V supply. This requires the bus master to first issue the HS-mode master code 00001XXX, followed by a repeated START and valid slave address. The 94.4ksps rate assumes continuous conversion with internal FIFO and no inter-conversion delays.
Does the MAX1138KEEE+ require an external reference voltage, or does it include an internal one?
The MAX1138KEEE+ includes a factory-trimmed 4.096V internal reference, eliminating the need for an external reference in most applications. It also supports external reference voltages from 1V to VDD, allowing flexibility for systems requiring tighter tolerance or different full-scale ranges. When using the internal reference, AIN3/REF or AIN11/REF can be configured to output the reference for external circuit biasing.
How many analog input channels does the MAX1138KEEE+ support, and how are they configured?
The MAX1138KEEE+ supports 12 analog input channels (AIN0–AIN11), configurable via software as either 12 single-ended inputs or 6 fully differential pairs. Channel selection is controlled by the CS[3:0] bits in the configuration byte, and the SGL/DIF bit determines single-ended vs. differential mode. The internal FIFO enables automatic scanning across all enabled channels without host intervention.
What power-saving features does the MAX1138KEEE+ offer for battery-operated devices?
The MAX1138KEEE+ incorporates AutoShutdown™, which powers down internal circuitry between conversions, reducing supply current to less than 1µA at low throughput rates. At 1ksps, current drops to 6µA; at 10ksps, it is 60µA. This feature operates automatically - no external control signal is needed - making it ideal for intermittent-read applications like environmental data loggers and portable diagnostics.
Is the MAX1138KEEE+ pin-compatible with other devices in the MAX1136–MAX1139 family?
The MAX1138KEEE+ shares the same 16-pin QSOP package and pinout with MAX1139EEE+, but is not pin-compatible with the 8-pin µMAX-packaged MAX1136/MAX1137. While electrical interfaces (SCL, SDA, GND, VDD, AINx) align across the 16-pin variants, the internal reference voltage (4.096V vs. 2.048V) and supply range (4.5V–5.5V vs. 2.7V–3.6V) differ - requiring schematic and firmware validation before substitution.
MAX1138KEEE+ 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:
- Obsolete
- 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:
- -
MAX1138KEEE+ FAQ
1.How can I place an order for MAX1138KEEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1138KEEE+ 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 MAX1138KEEE+ reliable?
The price and inventory of MAX1138KEEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1138KEEE+ is usually 5 days.
3.What payment methods are accepted for MAX1138KEEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1138KEEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1138KEEE+?
MAX1138KEEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1138KEEE+ 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 MAX1138KEEE+?
For technical support, including MAX1138KEEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1138KEEE+ requirements.
6.How does Aetrix verify that MAX1138KEEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1138KEEE+ 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 MAX1138KEEE+ meets industry standards.
7.What is the process for return or replacement of MAX1138KEEE+?
All MAX1138KEEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1138KEEE+, 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 MAX1138KEEE+ part is unused and in its original packaging.
Return procedure for MAX1138KEEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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