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Analog Devices Inc./Maxim Integrated MAX11639EEE+T
- Part No.:
- MAX11639EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX11639EEE+T.pdf
- Description:
- IC ADC 8BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,771
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Product details
Overview
The MAX11639EEE+T from Maxim Integrated is an 8-bit, 8-channel serial analog-to-digital converter with integrated 2.5V reference, on-chip FIFO, scan mode, internal averaging, and AutoShutdown™. It operates from a +2.7V to +3.6V supply, achieves up to 300ksps sampling rate with external clocking, and features SPI/QSPI/MICROWIRE-compatible 3-wire interface. It is used in low-power system supervision and patient monitoring where compact size and internal reference stability are critical.
For engineers reviewing the MAX11639EEE+T datasheet, MAX11639EEE+T pinout, MAX11639EEE+T application, or MAX11639EEE+T equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in medical and industrial data acquisition, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX11639EEE+T implements a successive-approximation register (SAR) architecture with integrated track-and-hold, supporting unipolar single-ended inputs referenced to GND. Its internal 2.5V reference exhibits ±30ppm/°C drift and 200µVRMS noise, enabling stable conversions across -40°C to +85°C.
It supports four clock modes via CKSEL bits: internally timed conversions (modes 00/01/10), externally clocked acquisitions (mode 11), and flexible CNVST-triggered sequencing. The 16-entry FIFO buffers results without serial bus contention, and internal averaging reduces noise for low-frequency sensor signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR - delivers 256 discrete output levels with no missing codes over temperature. |
| Sampling Rate | Up to 300ksps with external clock - enables high-speed transient capture in system monitoring. |
| Input Channels | 8 single-ended analog inputs (AIN0–AIN7) - supports multi-sensor monitoring in compact designs. |
| Reference Voltage | Internal 2.5V ±0.02V - eliminates need for external reference IC and associated layout complexity. |
| INL / DNL | ±0.5 LSB typical - ensures monotonicity and <0.2% full-scale linearity error for precision threshold detection. |
| Supply Range | +2.7V to +3.6V - compatible with modern 3.3V logic domains and battery-powered systems. |
| Interface | 10MHz 3-wire SPI/QSPI/MICROWIRE - interoperable with common microcontroller peripherals without level-shifting. |
| Operating Temp | -40°C to +85°C - qualified for industrial and medical environments without derating. |
Pinout & Package
MAX11639EEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–7 | AIN0–AIN6 | Analog input channels - accept unipolar 0V to VREF signals; internally sampled by T/H circuit. |
| 8 | CNVST/AIN7 | Active-low conversion start or analog input 7 - dual-function pin configurable via setup register. |
| 9 | REF | Reference input/output - supplies or accepts 2.5V reference; requires 0.1µF bypass to GND. |
| 10 | GND | Analog ground - dedicated return path for reference and analog inputs; must be star-connected. |
| 11 | VDD | Power supply - +2.7V to +3.6V; requires local 0.1µF ceramic decoupling at pin. |
| 12 | CS | Active-low chip select - enables serial interface and controls DOUT three-state behavior. |
| 13 | SCLK | Serial clock input - clocks data in/out on rising/falling edges; supports up to 10MHz operation. |
| 14 | DIN | Serial data input - latched on SCLK rising edge; carries register writes and configuration commands. |
| 15 | DOUT | Serial data output - outputs conversion results MSB-first on SCLK falling edge; high-Z when CS high. |
| 16 | EOC | End-of-conversion flag - active-low pulse indicates valid data ready in FIFO or after single conversion. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers up to 16 conversion results - allows burst acquisition without CPU intervention or serial bus blocking. |
| Internal 2.5V reference | ±30ppm/°C tempco, 200µVRMS noise - eliminates external reference component and improves board-level accuracy. |
| AutoShutdown™ mode | 0.2µA shutdown current - extends battery life in portable patient monitors and remote sensors. |
| Scan mode & internal averaging | Configurable channel sequencing and up to 8-sample averaging - reduces noise in low-bandwidth sensor readings. |
| Four clock modes | Selectable timing control (internal/external/CNVST-triggered) - optimizes power, speed, and host processor load per application. |
| Track-and-hold input stage | 1MHz small-signal bandwidth - supports undersampling of fast transients while maintaining DC accuracy. |
Applications
| System Supervision | Patient Monitoring |
|---|---|
Use Scenario: Real-time voltage, temperature, and current monitoring in embedded power supplies and PLC I/O modules. IC Role / Device Role / Timing Role: ADC front-end digitizing multiple analog sensor outputs with synchronized scanning and FIFO buffering. Use Value: Reduces microcontroller polling overhead and enables deterministic sampling intervals for fault detection. |
Use Scenario: Battery-powered wearable ECG or SpO₂ sensors requiring low quiescent current and stable reference. IC Role / Device Role / Timing Role: Low-power 8-channel digitizer capturing biopotential signals with internal averaging to suppress 50/60Hz interference. Use Value: Eliminates external reference and reduces BOM count while meeting clinical-grade linearity (±0.5 LSB INL). |
| Data Logging | Industrial Control Systems |
Use Scenario: Standalone environmental logger recording temperature, humidity, and pressure over extended periods. IC Role / Device Role / Timing Role: Autonomous ADC performing periodic scans using internal clock and AutoShutdown between samples. Use Value: Achieves multi-week battery life via sub-µA shutdown current and programmable sample interval. |
Use Scenario: Modular I/O terminal block acquiring analog feedback from motors, valves, and transducers. IC Role / Device Role / Timing Role: Robust 8-channel ADC operating across -40°C to +85°C with ±0.5 LSB DNL for closed-loop control fidelity. Use Value: Guarantees monotonic response under thermal stress, preventing control instability in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX11638EEE+T | 4.096V internal reference, +4.75V to +5.25V supply range - higher VREF improves resolution for 5V systems but increases power. | Used where legacy 5V logic domains dominate and higher full-scale range is needed for sensor signal headroom. | Select MAX11638EEE+T only if system uses 5V supply and benefits from 4.096V reference scaling; not drop-in due to supply and reference mismatch. |
| ADS7822U | 8-bit, 4-channel, SPI interface, 200ksps max, no internal FIFO or averaging - simpler feature set, lower integration. | Preferred in cost-sensitive, low-channel-count applications where FIFO and scan mode are unnecessary. | Choose ADS7822U when design requires minimal footprint and basic ADC functionality without FIFO or internal reference - requires external reference and separate control logic. |
Compared with MAX11639EEE+T, MAX11638EEE+T demands 5V operation and offers higher reference voltage but lacks compatibility with 3.3V systems; ADS7822U reduces integration and performance (no FIFO, lower speed, no averaging), trading capability for simplicity and cost in less demanding applications.
Availability
MAX11639EEE+T is available at Aetrix Electronics and suitable for system supervision, patient monitoring, and industrial data logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX11639EEE+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 industrial, medical, and communications applications.
The MAX1163x family targets low-power, multichannel data acquisition in space-constrained systems where integrated reference, FIFO, and flexible timing reduce system-level complexity and component count.
FAQ
What is the maximum sampling rate of the MAX11639EEE+T?
The MAX11639EEE+T achieves a maximum sampling rate of 300ksps when using an external clock source. This rate is attainable in clock mode 11 (CKSEL = 11) with SCLK up to 4.8MHz. Internal clock modes limit the rate to lower values due to oscillator tolerance and timing overhead. The 300ksps figure assumes proper signal conditioning and source impedance ≤300Ω to meet acquisition time requirements.
Does the MAX11639EEE+T require an external reference?
No, the MAX11639EEE+T does not require an external reference because it integrates a precise 2.5V internal reference with ±30ppm/°C temperature coefficient and 200µVRMS noise. The REF pin can be used as an output or accept an external reference (1V to VDD), but default operation uses the internal source. This eliminates BOM cost and layout area typically needed for external references.
How many analog input channels does the MAX11639EEE+T support?
The MAX11639EEE+T supports 8 single-ended analog input channels: AIN0 through AIN6, plus CNVST/AIN7 - which functions as either analog input 7 or active-low conversion start, depending on setup register configuration. Unlike the 16-channel MAX11643, the MAX11639EEE+T is optimized for compact 8-channel applications without sacrificing FIFO, averaging, or internal reference features.
What package type is used for the MAX11639EEE+T?
The MAX11639EEE+T is supplied in a 16-pin QSOP (Quarter-Size Outline Package) with 0.65mm lead pitch, measuring 5.3mm × 10.2mm. It is RoHS-compliant and lead-free (+T suffix denotes tape-and-reel packaging). This package provides robust thermal performance (θJA = 105°C/W) and is compatible with standard surface-mount assembly processes.
Can the MAX11639EEE+T operate from a 3.3V supply?
Yes, the MAX11639EEE+T is fully specified to operate from a +2.7V to +3.6V supply, making it directly compatible with standard 3.3V logic domains. Its digital interface (CS, SCLK, DIN, DOUT, EOC) is rail-to-rail compatible within this range, and its internal 2.5V reference remains stable across the entire supply window - ensuring consistent ADC performance without external regulation.
MAX11639EEE+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:
- 8
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11639EEE+T FAQ
1.How can I place an order for MAX11639EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11639EEE+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 MAX11639EEE+T reliable?
The price and inventory of MAX11639EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11639EEE+T is usually 5 days.
3.What payment methods are accepted for MAX11639EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11639EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11639EEE+T?
MAX11639EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11639EEE+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 MAX11639EEE+T?
For technical support, including MAX11639EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11639EEE+T requirements.
6.How does Aetrix verify that MAX11639EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX11639EEE+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 MAX11639EEE+T meets industry standards.
7.What is the process for return or replacement of MAX11639EEE+T?
All MAX11639EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX11639EEE+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 MAX11639EEE+T part is unused and in its original packaging.
Return procedure for MAX11639EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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