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Analog Devices Inc./Maxim Integrated MAX11661AUT+T
- Part No.:
- MAX11661AUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
MAX11661AUT+T.pdf
- Description:
- IC ADC 8BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
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Product details
Overview
MAX11661AUT+T from Maxim Integrated is an 8-bit, single-channel, successive-approximation analog-to-digital converter (ADC) operating at up to 500ksps with 2.2V–3.6V supply, 1.76mA full-power current, and 1.3µA power-down current. It features a single-ended analog input (AIN), SPI-/QSPI-/MICROWIRE-compatible 3-wire serial interface, and is optimized for portable battery-powered data acquisition in medical instrumentation and industrial sensor interfaces.
For engineers reviewing the MAX11661AUT+T datasheet, MAX11661AUT+T pinout, MAX11661AUT+T application, or MAX11661AUT+T equivalent, key selection considerations include its 8-bit resolution, SOT23-6 package, 500ksps throughput with no pipeline delay, low 3.3mW active power, and operation across –40°C to +125°C.
Technical Context
The MAX11661AUT+T implements a successive approximation register (SAR) architecture with integrated sample-and-hold, enabling precise DC and low-frequency AC signal digitization. Its analog input accepts 0V to VDD (no external reference required), and it uses a dedicated CS-controlled 3-wire serial interface compatible with standard microcontroller SPI peripherals without level-shifting logic.
Timing-critical operations-including aperture delay (4ns), acquisition time (52ns), and conversion time (1.56µs)-are tightly specified across temperature and supply voltage. The device supports fast wake-up from power-down mode in one conversion cycle, making it suitable for duty-cycled sensing applications requiring rapid on-demand sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR ADC - delivers 256 discrete output codes with monotonic transfer function and no missing codes. |
| Throughput Rate | 500ksps maximum - enables real-time sampling of signals up to 250kHz Nyquist bandwidth with no pipeline latency. |
| Supply Voltage | 2.2V to 3.6V - compatible with single-cell Li-ion, 3.3V, and 2.5V logic domains without external regulators. |
| Power Consumption | 3.3mW at 500ksps (1.76mA @ 3V) - reduces thermal load and extends battery life in portable systems. |
| Power-Down Current | 1.3µA - allows ultra-low standby power during idle intervals while retaining configuration state. |
| Input Range | 0V to VDD - eliminates need for external reference or level-shifting circuitry in single-supply designs. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood, industrial control, and harsh-environment deployments. |
Pinout & Package
The MAX11661AUT+T is housed in a 6-pin SOT23 package (2.8mm × 2.9mm, 0.95mm height) with exposed pad connected to GND for thermal and noise performance. Pin 1 is AIN, pin 2 is VDD, pin 3 is AGND, pin 4 is CS, pin 5 is SCLK, and pin 6 is DOUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN | Analog Input | Single-ended input referenced to AGND; accepts 0V to VDD range-no external reference needed. |
| VDD | Analog/Digital Supply | Primary power rail for core ADC and digital interface; also serves as internal reference source. |
| AGND | Analog Ground | Separate ground return for analog section; must be tied to system ground at single point to minimize noise coupling. |
| CS | Chip Select | Active-low enable for serial communication; falling edge initiates conversion and data transfer sequence. |
| SCLK | Serial Clock | Master-generated clock (0.08–8MHz) controlling bit timing; synchronous with DOUT data output. |
| DOUT | Serial Data Output | 3-state CMOS output delivering MSB-first conversion result; high-impedance when CS is high. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture delivers first valid conversion result within 1.56µs after CS assertion-critical for deterministic control loops. |
| Low-noise performance | 49.5dB SINAD and 49.5dB SNR at 250kHz input frequency support accurate measurement of small-signal sensors. |
| Flexible I/O voltage | Digital interface operates from 1.5V to VDD (2.2V–3.6V), enabling direct connection to 1.8V/2.5V/3.3V microcontrollers without level shifters. |
| Fast wake-up | Resumes full operation in one conversion cycle from power-down mode-ideal for event-triggered sampling. |
| Small footprint | SOT23-6 package occupies <2.5mm² PCB area-enables high-density integration in space-constrained wearables and IoT nodes. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) front-end digitizing electrochemical sensor output. IC Role / Device Role / Timing Role: Single-channel 8-bit ADC capturing slow-varying analog biosignals at ≤1ksps with minimal power draw between readings. Use Value: 1.3µA power-down current extends coin-cell battery life to >1 year; 0V–VDD input simplifies analog front-end design. |
Use Scenario: Temperature and pressure sensing in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Local digitization node converting sensor outputs before transmission over RS-485 or CAN bus. Use Value: –40°C to +125°C rating ensures reliability in uncontrolled cabinet environments; SOT23-6 eases automated assembly. |
| Battery-Powered Data Loggers | Automotive Cabin Sensors |
Use Scenario: Environmental logger recording humidity, light, and acceleration in remote field deployments. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated by MCU timer or interrupt to capture periodic sensor snapshots. Use Value: 500ksps capability accommodates burst-mode sampling of transient events; 3.3mW active power minimizes average current draw. |
Use Scenario: Occupancy detection via IR proximity sensor in automotive seat or dashboard modules. IC Role / Device Role / Timing Role: Signal conditioning ADC interfacing with analog IR receiver output prior to digital processing. Use Value: Immunity to supply line ripple (0.17 LSB/V line rejection) maintains accuracy despite noisy vehicle electrical systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX11662AUB+ | Dual-channel, 10-pin µMAX package, requires external reference, supports dual single-ended inputs via 2:1 MUX. | Used where two independent analog signals must be sampled alternately without external multiplexer hardware. | Select MAX11662AUB+ only if dual-input capability and external reference control are required; not pin-compatible. |
| ADS7822U | TI 8-bit SAR ADC in MSOP-8; 200ksps max, 2.7–5.25V supply, 1.25mW typical power, SPI-compatible but no CHSEL pin. | Targets lower-speed, higher-voltage systems where extended supply range outweighs throughput needs. | Choose ADS7822U for legacy 5V designs or when MSOP-8 footprint is preferred; differs in timing, pin count, and feature set. |
Compared with MAX11662AUB+, the MAX11661AUT+T offers smaller size and simpler single-input operation; compared with ADS7822U, it delivers higher throughput, wider temperature range, and lower supply voltage support-making it preferable for modern compact, battery-powered systems.
Availability
MAX1161AUT+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, and battery-powered data loggers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX11661AUT+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX11661AUT+T belongs to the MAX11661–MAX11666 family of low-power, high-speed SAR ADCs engineered specifically for space- and energy-constrained data acquisition systems requiring wide temperature operation and minimal external components.
FAQ
What is the maximum sampling rate supported by the MAX11661AUT+T?
The MAX11661AUT+T supports a maximum throughput rate of 500ksps, achieved with an 8MHz SCLK and proper timing margins. At this rate, the device completes one full conversion-including acquisition, sampling, and serial output-in 1.56µs, with no pipeline delay. This enables real-time digitization of signals up to 250kHz while maintaining deterministic latency critical for closed-loop control.
Does the MAX11661AUT+T require an external reference voltage?
No, the MAX11661AUT+T does not require an external reference voltage. It uses the VDD supply as its internal reference, supporting a 0V to VDD analog input range. This eliminates the need for external reference ICs or precision resistors, reducing BOM cost and board area-particularly valuable in cost-sensitive, space-constrained applications like wearable sensors.
What package type is used for the MAX11661AUT+T?
The MAX11661AUT+T is packaged in a 6-pin SOT23 case (2.8mm × 2.9mm, 0.95mm height) with an exposed thermal pad that must be soldered to a GND plane. This compact, surface-mount package supports high-density PCB layouts and automated reflow assembly, and its low thermal resistance helps maintain performance stability under sustained conversion loads.
Can the MAX11661AUT+T interface directly with a 1.8V microcontroller?
Yes, the MAX11661AUT+T supports variable I/O voltage down to 1.5V on its digital interface pins (CS, SCLK, DOUT), allowing direct connection to 1.8V microcontrollers without level-shifting circuitry. Its VIH threshold is 0.75 × VOVDD and VIL is 0.25 × VOVDD, ensuring robust logic-level compatibility across 1.5V, 1.8V, 2.5V, and 3.3V digital systems.
How does the power-down mode function in the MAX11661AUT+T?
The MAX11661AUT+T enters power-down mode when CS remains high for more than one conversion cycle, reducing supply current to just 1.3µA (typical). Wake-up occurs synchronously on the next CS falling edge, with full functionality restored within one conversion period-enabling precise, low-overhead duty cycling in battery-operated systems where sampling occurs infrequently.
MAX11661AUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- MICROWIRE™, QSPI™, Serial, SPI™
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Supply
- Voltage - Supply, Analog:
- 2.2V ~ 3.6V
- Voltage - Supply, Digital:
- 2.2V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- SOT-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11661AUT+T FAQ
1.How can I place an order for MAX11661AUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11661AUT+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 MAX11661AUT+T reliable?
The price and inventory of MAX11661AUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11661AUT+T is usually 5 days.
3.What payment methods are accepted for MAX11661AUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11661AUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11661AUT+T?
MAX11661AUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11661AUT+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 MAX11661AUT+T?
For technical support, including MAX11661AUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11661AUT+T requirements.
6.How does Aetrix verify that MAX11661AUT+T is sourced from the original manufacturer or authorized distributors?
All MAX11661AUT+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 MAX11661AUT+T meets industry standards.
7.What is the process for return or replacement of MAX11661AUT+T?
All MAX11661AUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX11661AUT+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 MAX11661AUT+T part is unused and in its original packaging.
Return procedure for MAX11661AUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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