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Analog Devices Inc./Maxim Integrated MAX11638EEE+
- Part No.:
- MAX11638EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX11638EEE+.pdf
- Description:
- IC ADC 8BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:175
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Product details
Overview
The MAX11638EEE+ from Maxim Integrated is an 8-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track-and-hold, on-chip 16-entry FIFO, internal 4.096V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It operates from a +4.75V to +5.25V supply, achieves up to 300ksps sampling rate with external clocking, and delivers ±0.5 LSB INL/DNL accuracy over –40°C to +85°C - enabling precise voltage monitoring in compact industrial sensor nodes.
For engineers reviewing the MAX11638EEE+ datasheet, MAX11638EEE+ pinout, MAX11638EEE+ application, or MAX11638EEE+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The MAX11638EEE+ uses a successive-approximation register (SAR) architecture with integrated track-and-hold, supporting unipolar single-ended inputs referenced to GND. Its internal 4.096V reference exhibits ±20 ppm/°C temperature coefficient and 200 µVRMS output noise, while acquisition time is fixed at 0.6 µs under internal clocking.
It supports four clock modes via CKSEL bits: mode 00 enables CNVST-triggered internally timed conversions; mode 01 allows per-channel CNVST control; mode 10 initiates conversions via serial write; mode 11 enables externally clocked 300ksps operation with SCLK up to 10MHz - disabling scan and averaging features.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR ADC - delivers 256 discrete output codes for basic voltage quantization in cost-sensitive monitoring systems. |
| Input Channels | 8 single-ended analog inputs (AIN0–AIN6 + CNVST/AIN7) - supports multiplexed sensing of multiple sensors without external MUX. |
| Max Sampling Rate | 300ksps with external clock - enables capture of transient events up to 100kHz full-linear bandwidth (S/(N+D) > 48dB). |
| Reference Voltage | Internal 4.096V ±0.7% (25°C), ±20 ppm/°C TC - eliminates need for external precision reference in 5V-system designs. |
| DC Accuracy | ±0.5 LSB INL and DNL, no missing codes - ensures monotonic response and predictable code transitions across temperature. |
| Digital Interface | 10MHz 3-wire SPI-/QSPI-/MICROWIRE-compatible - interoperable with standard microcontroller peripherals without protocol translation. |
| Supply Current | 2.0mA typical at 300ksps with internal reference - enables low-power operation in battery-backed data loggers. |
| Operating Temp | –40°C to +85°C - qualified for deployment in industrial control cabinets and outdoor instrumentation enclosures. |
Pinout & Package
MAX11638EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for high-density PCB layouts in space-constrained embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–7 | AIN0–AIN6 | Analog input channels - accept unipolar 0V to VREF signals; internally sampled by shared T/H circuitry. |
| 8 | CNVST/AIN7 | Active-low conversion start input or analog input 7 - dual-function pin; configured via setup register bit REFSEL[1:0]. |
| 9 | REF | Reference voltage input/output - supplies internal 4.096V reference; requires 0.1µF bypass capacitor to GND for stability. |
| 10 | GND | Analog ground - dedicated return path for analog circuitry; must be connected to system AGND plane with low-impedance trace. |
| 11 | VDD | Power supply input - accepts +4.75V to +5.25V; requires local 0.1µF ceramic decoupling capacitor. |
| 12 | CS | Active-low chip select - enables serial interface when low; places DOUT in high-impedance state when high. |
| 13 | SCLK | Serial clock input - clocks data in/out on rising/falling edges; supports up to 10MHz with 40–60% duty cycle. |
| 14 | DIN | Serial data input - latches 8-bit command bytes on rising SCLK edge; used to configure registers and initiate conversions. |
| 15 | DOUT | Serial data output - outputs 16-bit result (4 leading zeros + 8-bit code + 4 status bits) on falling SCLK edge. |
| 16 | EOC | End-of-conversion flag - active-low open-drain output signaling completion of last conversion; synchronized to CS/CNVST timing. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers up to 16 conversion results - decouples ADC operation from host MCU timing, reducing serial bus contention during burst sampling. |
| Scan mode & internal averaging | Configurable channel sequencing and up to 8x oversampling - improves effective resolution and reduces noise in slow-sampling applications like temperature monitoring. |
| AutoShutdown™ | Reduces supply current to ≤0.5µA in shutdown - extends battery life in portable data loggers between measurement cycles. |
| Internal oscillator (4.4MHz ±10%) | Enables autonomous conversions without external clock source - simplifies BOM and layout in systems lacking precise timing resources. |
| True differential T/H input architecture | Supports accurate sampling of high-impedance sources - acquisition time scales predictably with source impedance (tACQ = 9×(RS + 1.5kΩ)×24pF + 1µs). |
| ESD-protected analog inputs | Withstands ±2kV HBM - enhances robustness against handling damage and field transients in industrial environments. |
Applications
| Industrial Sensor Node | Power Supply Monitor |
|---|---|
Use Scenario: Real-time monitoring of 8 voltage rails (e.g., 3.3V, 5V, 12V, -12V, analog sensor supplies) in PLC backplanes or motor drives. IC Role / Device Role / Timing Role: 8-channel voltage digitizer with FIFO buffering - acquires all rails sequentially in <1ms, stores results for batch readout via SPI. Use Value: Eliminates need for external multiplexer and reference; 4.096V internal reference ensures consistent 5V-rail measurement resolution (19.6mV/LSB). |
Use Scenario: Detecting brown-out, overvoltage, and ripple on DC power outputs in telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Fast-response ADC with EOC flag - triggers immediate interrupt on out-of-spec condition, enabling sub-10µs fault response. Use Value: 300ksps capability captures 50kHz ripple harmonics; ±0.5 LSB linearity ensures reliable threshold detection across temperature. |
| Portable Data Logger | Medical Patient Monitor |
Use Scenario: Battery-powered environmental logger recording temperature, humidity, and light levels every 10 seconds. IC Role / Device Role / Timing Role: Low-power ADC with AutoShutdown™ - powers up only during conversion, then shuts down to <0.5µA quiescent current. Use Value: 2.0mA active current at 300ksps enables >1-year battery life on two AA cells using duty-cycled sampling. |
Use Scenario: Bedside vital sign monitor acquiring ECG lead voltages, respiration, and SpO₂ analog signals. IC Role / Device Role / Timing Role: Multiplexed analog front-end digitizer - scans 8 biopotential channels in sequence with internal averaging to suppress 50/60Hz interference. Use Value: Scan mode + 8x averaging yields >60dB SNR improvement; FIFO prevents data loss during host MCU interrupts. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit, 4-channel, 200ksps, 2.7–5.25V supply, internal 2.5V ref, no FIFO, SPI interface | Lacks FIFO and scan mode - requires continuous host polling; lower channel count limits sensor density | Select for simpler, lower-cost designs where only 4 inputs needed and host can manage timing tightly |
| MAX11100ETE+ | 12-bit, 8-channel, 500ksps, 2.7–3.6V supply, internal 2.048V ref, FIFO, SPI interface | Higher resolution but incompatible 3.3V-only supply - not drop-in for 5V systems; different reference voltage affects scaling | Select when 12-bit precision is required and system operates at 3.3V; requires reference voltage recalibration |
Compared with ADS7822U and MAX11100ETE+, the MAX11638EEE+ uniquely balances 5V compatibility, built-in FIFO buffering, and 8-channel flexibility - making it optimal for industrial 5V systems requiring autonomous burst sampling without host overhead.
Availability
MAX11638EEE+ is available at Aetrix Electronics and suitable for industrial control systems, power supply supervision, and portable data logging requiring stable component supply and long-term production continuity.
Supply support for MAX11638EEE+ 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, automotive, and communications markets.
The MAX11638EEE+ belongs to Maxim's precision data-acquisition ADC family, designed specifically for cost-sensitive, space-constrained applications needing multichannel voltage monitoring with minimal external components.
FAQ
What is the maximum sampling rate achievable with the MAX11638EEE+?
The MAX11638EEE+ achieves a maximum sampling rate of 300ksps when using an external clock in clock mode 11 (CKSEL = 11). This requires SCLK up to 10MHz and disables scan mode and internal averaging. At this rate, the device maintains its specified ±0.5 LSB INL/DNL accuracy and supports full-linear bandwidth up to 100kHz.
Does the MAX11638EEE+ require an external reference voltage?
No, the MAX11638EEE+ does not require an external reference voltage - it integrates a factory-trimmed 4.096V internal reference with ±0.7% initial accuracy and ±20 ppm/°C temperature coefficient. The REF pin serves as both output and input, allowing optional use of an external reference (1V to VDD) if higher precision or different scaling is needed.
How many analog input channels does the MAX11638EEE+ support?
The MAX11638EEE+ supports 8 single-ended analog input channels: AIN0 through AIN6 (pins 1–7), plus CNVST/AIN7 (pin 8) - configurable either as an active-low conversion start signal or as the eighth analog input. Channel selection and scanning behavior are controlled via the setup and conversion registers.
What package type is used for the MAX11638EEE+?
The MAX11638EEE+ is packaged in a 16-pin QSOP (Quarter-Size Outline Package) with 0.635mm lead pitch and dimensions of 5.3mm × 10.2mm. This RoHS-compliant, lead(Pb)-free package provides thermal performance of θJA = 105°C/W and is compatible with standard surface-mount assembly processes.
Can the MAX11638EEE+ operate from a 3.3V supply?
No, the MAX11638EEE+ is specified only for +4.75V to +5.25V supply operation. For 3.3V systems, the pin-compatible MAX11639EEE+ variant should be used - it shares identical functionality and pinout but is rated for 2.7V to 3.6V operation and features a 2.5V internal reference instead of 4.096V.
MAX11638EEE+ 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:
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11638EEE+ FAQ
1.How can I place an order for MAX11638EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11638EEE+ 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 MAX11638EEE+ reliable?
The price and inventory of MAX11638EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11638EEE+ is usually 5 days.
3.What payment methods are accepted for MAX11638EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11638EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11638EEE+?
MAX11638EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11638EEE+ 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 MAX11638EEE+?
For technical support, including MAX11638EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11638EEE+ requirements.
6.How does Aetrix verify that MAX11638EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX11638EEE+ 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 MAX11638EEE+ meets industry standards.
7.What is the process for return or replacement of MAX11638EEE+?
All MAX11638EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11638EEE+, 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 MAX11638EEE+ part is unused and in its original packaging.
Return procedure for MAX11638EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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