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Analog Devices Inc./Maxim Integrated MAX11138ATI+
- Part No.:
- MAX11138ATI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX11138ATI+.pdf
- Description:
- IC ADC 10BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
MAX11138ATI+ from Maxim Integrated is a 10-bit, 500ksps, low-power, serial-output SAR ADC with 8-channel analog multiplexer, external reference support, 1.5MHz full-linear bandwidth, and 3-wire SPI/QSPI/MICROWIRE-compatible interface - used in portable battery-powered data acquisition systems requiring high channel density and low power.
For engineers reviewing the MAX11138ATI+ datasheet, MAX11138ATI+ pinout, MAX11138ATI+ application, or MAX11138ATI+ equivalent, this page delivers verified specifications, real-world timing behavior, input configuration flexibility (single-ended/differential/pseudo-differential), internal FIFO operation, and SampleSet programmable sequencing for multichannel industrial and medical instrumentation.
Technical Context
The MAX11138ATI+ implements a successive-approximation register (SAR) architecture with dual clock modes: internal clock (enabling integrated 16-entry FIFO and on-chip averaging) and external clock (supporting SampleSetK user-defined channel sequencing up to 256 entries). It features true differential track-and-hold across all channels.
Analog inputs are software-configurable per channel as single-ended (8-channel), fully differential (4-channel pairs), or pseudo-differential (7-channel relative to common AIN15/REF−), with two selectable bipolar input ranges (±VREF+/2 or ±VREF+) via RANGE bit control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 distinct output codes with no missing codes over temperature. |
| Sampling Rate | 500ksps - supports real-time capture of signals up to 250kHz Nyquist frequency with guaranteed 61.7dB SINAD. |
| Full-Linear Bandwidth | 1.5MHz - preserves signal fidelity for transient events and undersampling applications without distortion. |
| Power Dissipation | 4.2mW at 3V/500ksps - enables >100-hour battery life in portable instruments using coin-cell or Li-ion sources. |
| INL / DNL | ±0.4 LSB / ±0.4 LSB - ensures accurate amplitude measurement across full scale and temperature range (−40°C to +125°C). |
| Reference Input | External differential (REF+/REF−), 1V to VDD - allows precision ratio-metric or absolute measurements with external voltage references. |
| Digital I/O Supply | VOVDD = 1.5V–3.6V - enables direct interfacing to 1.8V, 2.5V, or 3.3V microcontrollers without level shifters. |
Pinout & Package
MAX11138ATI+ is housed in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP), rated for −40°C to +125°C operation. Pin functions are validated per Maxim's official pin configuration diagram for the 8-channel variant (MAX11136/MAX11139/MAX11142 family members).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog Input Channels | Eight configurable inputs supporting single-ended, fully differential (AIN0–AIN1, etc.), or pseudo-differential modes relative to REF−/AIN15. |
| REF+/REF− | Differential Reference Inputs | Accept external reference voltage (1V to VDD); REF− may also serve as AIN15 in 8-channel mode. |
| CS, SCLK, DIN, DOUT | 3-Wire Serial Interface | SPI-/QSPI-/MICROWIRE-compatible; DOUT active on SCLK falling edge; CS enables three-state output. |
| CNVST | Conversion Start Trigger | Active-low pulse initiates conversion sequence; supports both internal and external clock modes. |
| EOC | End-of-Conversion Indicator | Pulls low after conversion completes in internal clock mode; not functional in external clock mode. |
| VDD / DGND / OVDD / GND | Power & Ground Terminals | VDD (2.35–3.6V analog supply), OVDD (1.5–3.6V digital I/O supply), separate DGND and analog GND pins for noise isolation. |
Key Features
| Feature | Design Value |
|---|---|
| SampleSet programmable sequencer | User-definable channel scan order up to 256 steps - eliminates MCU polling overhead in multichannel sensor arrays. |
| 16-entry FIFO buffer | Enables burst sampling at 500ksps while allowing slower host readout - decouples acquisition and processing timing. |
| Internal averaging (up to 16x) | Improves SNR by up to 6dB for noisy DC or low-frequency signals without external filtering. |
| Flexible analog input configuration | All 8 channels independently settable as unipolar single-ended, bipolar pseudo-differential, or fully differential pairs. |
| AutoShutdown with fast wake-up | Reduces current to 2µA in full shutdown; resumes conversion within microseconds - ideal for duty-cycled sensing. |
Applications
| Industrial Process Monitoring | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous monitoring of 8 thermocouple, RTD, or pressure transducer outputs in a compact PLC module. IC Role / Device Role / Timing Role: 8-channel SAR ADC with internal FIFO and SampleSet sequencing acquires synchronized samples across sensors every 2ms. Use Value: Eliminates need for external multiplexer and timing controller; reduces BOM count and PCB area by 30% versus discrete solution. | Use Scenario: Battery-powered ECG front-end acquiring lead I, II, III, aVR, aVL, aVF, V1–V6 with simultaneous sampling. IC Role / Device Role / Timing Role: Configured in pseudo-differential mode with REF− tied to Wilson central terminal; supports 500ksps aggregate throughput. Use Value: 4.2mW power at full rate extends AA-battery life to >120 hours; 1.5MHz input bandwidth captures QRS complex fidelity. |
| Automotive Cabin Climate Control | Smart Grid Sensor Node |
Use Scenario: HVAC control unit measuring cabin temperature, humidity, sunlight intensity, and blower motor current. IC Role / Device Role / Timing Role: 8-channel ADC interfaces to NTC thermistors, capacitive humidity sensor, photodiode, and shunt resistor - all referenced to common ground. Use Value: Single-supply 2.35–3.6V operation matches automotive body-domain rail; −40°C to +125°C rating ensures reliability under hood conditions. | Use Scenario: Wireless metering node monitoring voltage, current, neutral current, and temperature across 3-phase distribution lines. IC Role / Device Role / Timing Role: Operates in internal clock mode with FIFO to buffer 16-sample bursts before RF transmission; uses bipolar range for AC waveform digitization. Use Value: External differential reference enables precise ratio-metric measurements immune to supply drift; 61.7dB SINAD meets IEC 62053 accuracy class requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, 500ksps, multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8684IPWR | 16-bit resolution, 500ksps, 4-channel, SPI interface, integrated reference; higher power (14mW), larger 24-QFN package. | Targeted at high-accuracy industrial DAQ where 10-bit resolution is insufficient; lacks SampleSet sequencer and FIFO. | Select when absolute accuracy >12-bit and integrated reference simplify design - not drop-in compatible due to pin count and feature set mismatch. |
| AD7928BRUZ | 8-channel, 12-bit, 1MSPS, SPI, no FIFO, no programmable sequencer; requires external reference; 12.5mW at 1MSPS. | Used in high-speed test equipment where sequencing is handled externally; lacks low-power AutoShutdown and flexible input modes. | Choose for maximum speed and resolution where power and firmware overhead are secondary - pinout and register map differ significantly from MAX11138ATI+. |
Compared with ADS8684IPWR and AD7928BRUZ, the MAX11138ATI+ uniquely balances 10-bit precision, 8-channel density, ultra-low 4.2mW power, and intelligent on-chip sequencing - making it optimal for space-constrained, battery-operated systems requiring autonomous multichannel acquisition without MCU intervention.
Availability
MAX11138ATI+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical sensors, automotive cabin climate control, and smart grid sensor nodes requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for MAX11138ATI+ 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 automotive applications.
The MAX11135–MAX11143 product line was engineered specifically for low-power, multichannel data acquisition in portable and embedded systems - emphasizing integration (FIFO, sequencer, flexible inputs), energy efficiency, and robust performance across extreme temperatures.
FAQ
What is the maximum sampling rate supported by the MAX11138ATI+?
The MAX11138ATI+ supports a maximum sampling rate of 500ksps in both internal and external clock modes. At this rate, conversion time is 2µs in external clock mode (with 8MHz SCLK) and 5.9µs in internal clock mode. The device maintains guaranteed 61.7dB SINAD and ±0.4 LSB INL across the full −40°C to +125°C operating range at 500ksps.
Does the MAX11138ATI+ support differential input configurations?
Yes, the MAX11138ATI+ supports fully differential input pairs (e.g., AIN0/AIN1, AIN2/AIN3, etc.) as well as pseudo-differential configurations relative to REF−/AIN15. In 8-channel mode, it provides four fully differential channels or seven pseudo-differential channels. Input ranges include unipolar (0 to VREF+) and bipolar (±VREF+/2 or ±VREF+), selected via the RANGE bit.
How does the SampleSet feature work on the MAX11138ATI+?
The SampleSet feature on the MAX11138ATI+ allows users to define and load a custom channel sequence of up to 256 steps into internal memory. Once loaded, the ADC autonomously scans the programmed channels without MCU intervention - reducing communication overhead and system noise. This capability is exclusive to external clock mode and is confirmed in the MAX11138 electrical characteristics table and functional description.
What power supply requirements does the MAX11138ATI+ have?
The MAX11138ATI+ requires two independent supplies: VDD (2.35V–3.6V) for analog circuitry and OVDD (1.5V–3.6V) for digital I/O. It draws 1.4–2.0mA at 500ksps, resulting in 4.2mW power dissipation at 3V. Full shutdown current is 1.5–6µA. Separate DGND and analog GND pins are provided to minimize digital switching noise coupling into analog measurements.
Is the MAX11138ATI+ pin-compatible with other devices in the MAX11135–MAX11143 family?
Yes, the MAX11138ATI+ shares the same 28-pin TQFN package and pinout as the 8-channel variants MAX11136ATI+ and MAX11139ATI+, including identical placement of AIN0–AIN7, REF+, REF−, CS, SCLK, DIN, DOUT, CNVST, EOC, VDD, OVDD, DGND, and GND. This allows hardware reuse across 8-channel 12-/10-/8-bit options without PCB redesign.
MAX11138ATI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.35V ~ 3.6V
- Voltage - Supply, Digital:
- 2.35V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 28-TQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11138ATI+ FAQ
1.How can I place an order for MAX11138ATI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11138ATI+ 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 MAX11138ATI+ reliable?
The price and inventory of MAX11138ATI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11138ATI+ is usually 5 days.
3.What payment methods are accepted for MAX11138ATI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11138ATI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11138ATI+?
MAX11138ATI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11138ATI+ 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 MAX11138ATI+?
For technical support, including MAX11138ATI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11138ATI+ requirements.
6.How does Aetrix verify that MAX11138ATI+ is sourced from the original manufacturer or authorized distributors?
All MAX11138ATI+ 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 MAX11138ATI+ meets industry standards.
7.What is the process for return or replacement of MAX11138ATI+?
All MAX11138ATI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11138ATI+, 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 MAX11138ATI+ part is unused and in its original packaging.
Return procedure for MAX11138ATI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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