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Analog Devices Inc./Maxim Integrated MAX1138LEEE+
- Part No.:
- MAX1138LEEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1138LEEE+.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,766
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Product details
Overview
MAX1138LEEE+ from Maxim Integrated is a 10-bit, 12-channel, low-power analog-to-digital converter 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 MAX1138LEEE+ datasheet, MAX1138LEEE+ pinout, MAX1138LEEE+ application, or MAX1138LEEE+ equivalent, this page provides verified technical context, validated pin functions, confirmed power-performance tradeoffs at 1ksps–94.4ksps, and real-world alternatives with documented channel count, reference voltage, and supply voltage mismatches.
Technical Context
The MAX1138LEEE+ uses successive-approximation architecture with fully differential track/hold circuitry and an internal 2.8MHz oscillator. Its 12-channel analog multiplexer supports both single-ended (12 inputs) and fully differential (6 input pairs) configurations via software-controlled setup and configuration registers.
It implements AutoShutdown™ to reduce supply current to <0.5µA between conversions and features an internal FIFO with channel-scan mode. The I²C interface operates in Fast Mode (400kHz) and High-Speed Mode (1.7MHz), requiring explicit master-initiated HS-mode entry via 00001XXX code before achieving full 94.4ksps throughput.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for medium-precision measurement applications. |
| Input Channels | 12 single-ended or 6 fully differential - enables multi-sensor monitoring without external mux hardware. |
| Internal Reference | 4.096V - provides stable full-scale range for unipolar 0–4.096V or bipolar ±2.048V measurements. |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V logic and industrial power rails; not operable below 4.5V. |
| Sampling Rate | 94.4ksps max - requires High-Speed I²C mode (1.7MHz SCL); drops to 22.2ksps in default Fast Mode. |
| INL / DNL | ±1 LSB - ensures monotonicity and ≤0.1% full-scale linearity error across –40°C to +85°C. |
| Supply Current | 670µA at 94.4ksps; 6µA at 1ksps - enables battery life extension via dynamic throughput scaling. |
Pinout & Package
MAX1138LEEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained portable designs. Pin functions are validated per Maxim's official pin description table and typical operating circuit.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog Input Channel 0–7 | Direct connection points for single-ended sensors or differential "+" inputs; internally multiplexed. |
| AIN8–AIN10 | Analog Input Channel 8–10 | Additional dedicated analog inputs; AIN8–AIN10 share no shared function with REF or SDA/SCL. |
| AIN11/REF | Analog Input 11 / Reference I/O | Configurable as 12th analog input or reference voltage source/sink (4.096V); requires external 0.1µF decoupling when used as REF. |
| SCL | Serial Clock Input | Master-generated clock controlling I²C timing; must be pulled high; determines conversion rate in external-clock mode. |
| SDA | Serial Data I/O | Open-drain bidirectional bus line; carries setup/config bytes, conversion results, and ACK/NACK signals. |
| GND | Analog/Digital Ground | Common reference for analog inputs, digital interface, and internal reference; requires low-impedance PCB connection. |
| VDD | Positive Supply | 4.5V–5.5V single supply powering analog core, digital logic, and internal reference; bypass with 0.1µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <0.5µA during idle intervals - extends battery life in intermittent-sampling systems like remote telemetry. |
| Software-Configurable Input Mode | Single-ended (12 channels) or fully differential (6 pairs) selected via SGL/DIF bit - eliminates need for external signal conditioning hardware. |
| Internal FIFO with Channel-Scan Mode | Automatically sequences through up to 12 channels and buffers results - simplifies firmware for multi-point system supervision. |
| I²C High-Speed Mode Support | 1.7MHz SCL operation enables 94.4ksps sampling - meets real-time response requirements in RSSI and medical waveform capture. |
| Low Source Impedance Tolerance | Accurate sampling with ≤1.5kΩ source impedance - allows direct connection to resistive sensors without buffer amplifiers. |
Applications
| Medical Instrumentation | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Portable ECG front-end digitizing lead voltages across multiple electrodes with low power budget. IC Role / Device Role / Timing Role: 12-channel ADC acquiring synchronized biopotential signals at ≥1ksps with auto-scan and internal reference stability. Use Value: Eliminates external reference and mux ICs; 6µA shutdown current enables >1-year battery life in handheld diagnostic tools. |
Use Scenario: Handheld multimeter measuring DC voltage, temperature, and resistance using shared analog front-end. IC Role / Device Role / Timing Role: Configurable 12-input ADC supporting unipolar voltage ranges and bipolar thermocouple inputs via software reconfiguration. Use Value: Single-chip solution reduces BOM count and PCB area; 4.096V reference enables precise 1mV resolution on 4V full-scale ranges. |
| Solar-Powered Remote Systems | Received-Signal-Strength Indicators |
Use Scenario: Off-grid environmental monitor logging solar panel voltage, battery SOC, and ambient temperature. IC Role / Device Role / Timing Role: Low-quiescent ADC performing periodic multi-channel acquisition with AutoShutdown between readings. Use Value: 670µA active current and sub-µA shutdown enable energy harvesting compatibility; 12-channel integration avoids external mux routing. |
Use Scenario: Cellular/WiFi module reporting RF signal strength (RSSI) alongside baseband diagnostics. IC Role / Device Role / Timing Role: High-speed ADC capturing fast-varying RSSI envelope at 94.4ksps in High-Speed I²C mode. Use Value: 1.7MHz I²C interface and 94.4ksps throughput support real-time link quality feedback without MCU intervention. |
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. | Designed for 3.3V systems (e.g., ARM Cortex-M microcontrollers); incompatible with 5V supply rails. | Select MAX1139EEE+ only when operating from 3.3V and requiring lower reference voltage for 2V full-scale ranges. |
| ADS7953IRHBT | 12-bit resolution, SPI interface, 2.7V–5.25V supply, no internal reference - requires external 4.096V reference. | Higher resolution but adds external reference and SPI controller overhead; lacks AutoShutdown and I²C simplicity. | Choose ADS7953IRHBT when 12-bit precision is mandatory and system already uses SPI; avoid if minimizing component count and power is critical. |
Compared with MAX1139EEE+, MAX1138LEEE+ enables direct 5V operation and higher full-scale voltage range; compared with ADS7953IRHBT, it reduces BOM count and firmware complexity via integrated reference and I²C interface, at the cost of 2-bit resolution.
Availability
MAX1138LEEE+ is available at Aetrix Electronics and suitable for medical instrumentation, battery-powered test equipment, and solar-powered remote systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1138LEEE+ 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 integrated functionality, minimal external components, and flexible I²C-based configuration.
FAQ
What supply voltage range does the MAX1138LEEE+ support?
The MAX1138LEEE+ operates exclusively from a 4.5V to 5.5V single supply. It is not rated for operation below 4.5V or above 5.5V. This distinguishes it from the MAX1139EEE+, which supports 2.7V–3.6V. Using 5V logic rails ensures compatibility with its 4.096V internal reference and guarantees specified performance across the full –40°C to +85°C temperature range.
Does the MAX1138LEEE+ include an internal voltage reference?
Yes, the MAX1138LEEE+ integrates a factory-trimmed 4.096V internal reference with 25ppm/°C temperature coefficient. This reference can be used directly for ADC conversions or made available at the AIN11/REF pin when configured via the setup register. When using the internal reference, no external components are required for basic operation - simplifying design and reducing bill-of-materials cost.
How many analog input channels does the MAX1138LEEE+ provide?
The MAX1138LEEE+ provides 12 analog input channels. These can be configured in software as 12 single-ended inputs or 6 fully differential pairs. Channel selection is controlled by the CS[3:0] bits in the configuration byte, and automatic scanning across all enabled channels is supported via the internal FIFO and channel-scan mode - eliminating the need for external multiplexer control logic.
What is the maximum sampling rate of the MAX1138LEEE+ and how is it achieved?
The MAX1138LEEE+ achieves a maximum sampling rate of 94.4ksps, but only when operating in I²C High-Speed Mode (1.7MHz SCL). This requires the master device to first issue the HS-mode master code (00001XXX), receive a not-acknowledge, then send a repeated START and slave address. In default Fast Mode (400kHz), the maximum throughput is limited to 22.2ksps.
Is the MAX1138LEEE+ pin-compatible with other devices in the MAX1136–MAX1139 family?
No, the MAX1138LEEE+ is not pin-compatible with the 8-pin MAX1136/MAX1137 variants. It uses a 16-pin QSOP package with distinct pin assignments - including dedicated AIN8–AIN10 pins and shared AIN11/REF functionality. However, it shares identical I²C addressing (0110101) and register map structure with the MAX1139EEE+, enabling firmware reuse across the 16-pin variants.
MAX1138LEEE+ 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:
- -
MAX1138LEEE+ FAQ
1.How can I place an order for MAX1138LEEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1138LEEE+ 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 MAX1138LEEE+ reliable?
The price and inventory of MAX1138LEEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1138LEEE+ is usually 5 days.
3.What payment methods are accepted for MAX1138LEEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1138LEEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1138LEEE+?
MAX1138LEEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1138LEEE+ 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 MAX1138LEEE+?
For technical support, including MAX1138LEEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1138LEEE+ requirements.
6.How does Aetrix verify that MAX1138LEEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1138LEEE+ 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 MAX1138LEEE+ meets industry standards.
7.What is the process for return or replacement of MAX1138LEEE+?
All MAX1138LEEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1138LEEE+, 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 MAX1138LEEE+ part is unused and in its original packaging.
Return procedure for MAX1138LEEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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