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Analog Devices Inc./Maxim Integrated MAX11634EEE+
- Part No.:
- MAX11634EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX11634EEE+.pdf
- Description:
- IC ADC 12BIT SRL 1CH 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,646
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Product details
Overview
The MAX11634EEE+ from Maxim Integrated is a 12-bit, 300ksps successive-approximation register (SAR) analog-to-digital converter with true differential track/hold, internal 4.096V reference, and 4 single-ended / 2 differential input channels. It operates from a +4.75V to +5.25V supply, features a 16-entry FIFO, scan mode, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It is used in industrial control systems for high-accuracy voltage monitoring under noisy conditions.
For engineers reviewing the MAX11634EEE+ datasheet, MAX11634EEE+ pinout, MAX11634EEE+ application, or MAX11634EEE+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX11634EEE+ implements a fully differential SAR architecture with on-chip track-and-hold supporting both unipolar (0 to VREF) and bipolar (±VREF/2) differential input ranges. Its internal 4.096V reference exhibits ±20ppm/°C drift and 200µVRMS noise, enabling stable measurements without external precision references.
It supports four clock modes via CKSEL bits: mode 11 enables externally timed 300ksps sampling at up to 4.8MHz SCLK; mode 01 allows CNVST-triggered per-channel conversions; modes 00/10 use the internal 4.4MHz oscillator for autonomous scanning. The 16-deep FIFO decouples conversion and data readout, reducing µP bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 1mV step size with 4.096V reference, sufficient for 0.025% full-scale accuracy in sensor signal chains. |
| Sampling Rate | 300ksps max (external clock) - supports real-time capture of signals up to 100kHz full-linear bandwidth with <68dB SINAD. |
| INL / DNL | ±1 LSB - guarantees monotonicity and no missing codes across -40°C to +85°C, critical for closed-loop control feedback integrity. |
| SINAD / SFDR | 73dB / 89dBc - enables accurate digitization of low-distortion analog inputs such as thermocouple or strain gauge outputs. |
| Supply Range | +4.75V to +5.25V - compatible with standard 5V industrial logic rails and tolerant of ±5% line variation without regulation. |
| Reference Voltage | Internal 4.096V ±0.7% - eliminates need for external reference IC, reduces BOM count, and provides fixed scaling for consistent ADC code mapping. |
| Interface | 10MHz 3-wire SPI/QSPI/MICROWIRE - interoperable with common microcontrollers without protocol translation or level-shifting. |
Pinout & Package
MAX11634EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for compact industrial PCB layouts and compatible with standard reflow profiles including lead-free soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4 (AIN0–AIN3) | Analog Input Channels | Four dedicated single-ended or two differential input pairs (AIN0/AIN1, AIN2/AIN3); support true differential acquisition to reject common-mode noise. |
| 7 (REF-) | Differential Reference Negative Input | Accepts external reference negative or serves as AIN6 on higher-channel variants; tied to GND when using internal reference. |
| 8 (CNVST) | Active-Low Conversion Start | Hardware trigger for initiating conversions in clock modes 00/01; frees µP from polling and enables deterministic timing in control loops. |
| 9 (REF+) | Positive Reference Input | Input for external reference (1V to VDD); bypassed with 0.1µF capacitor; internally connected to 4.096V reference when unused. |
| 10 (GND) | Analog Ground | Separate ground return for analog circuitry; must be star-connected to minimize noise coupling into sensitive T/H node. |
| 11 (VDD) | Power Supply | +4.75V to +5.25V supply; requires local 0.1µF ceramic decoupling to suppress high-frequency switching noise from digital interface. |
| 12 (CS) | Chip Select | Active-low enable for serial interface; places DOUT in high-impedance state when deasserted, allowing bus sharing with other SPI peripherals. |
| 13 (SCLK) | Serial Clock | Up to 10MHz clock input; rising edge latches DIN, falling edge outputs DOUT; duty cycle tolerance 40–60% ensures reliable timing margin. |
| 14 (DIN) | Serial Data Input | Receives 8-bit setup byte and optional register writes; MSB-first format aligns with standard µP SPI hardware shift registers. |
| 15 (DOUT) | Serial Data Output | Outputs 16-bit result (MSB first, 4 leading zeros) after EOC assertion; tri-states when CS is high for multi-device bus operation. |
| 16 (EOC) | End-of-Conversion Flag | Active-low open-drain output signaling valid data ready; synchronizes µP read operations and avoids blind polling delays. |
Key Features
| Feature | Design Value |
|---|---|
| True Differential Track/Hold | Enables rejection of common-mode noise up to 100kHz, essential for accurate measurement of low-level signals in electrically noisy factory environments. |
| 16-Entry FIFO Buffer | Allows up to 16 consecutive conversions without µP intervention, enabling burst acquisition and reducing interrupt load in real-time data logging applications. |
| Internal 4.096V Reference | Eliminates external reference component, reduces system cost and board area, and maintains ±0.7% initial accuracy over temperature without calibration. |
| Four Clock Modes | Supports flexible timing architectures: hardware-triggered (CNVST), autonomous scan (internal clock), or externally synchronized (SCLK-driven), adapting to diverse system timing constraints. |
| AutoShutdown™ | Reduces supply current to ≤5µA during idle periods, extending battery life in portable instrumentation and lowering thermal load in dense industrial modules. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and flow sensors in PLC-based manufacturing lines with high EMI exposure. IC Role / Device Role / Timing Role: Primary ADC for analog sensor front-end; performs differential sampling at 100ksps to reject 50/60Hz mains noise and motor drive harmonics. Use Value: ±1 LSB INL ensures repeatability across calibration cycles; internal reference removes drift-related recalibration needs in unattended 24/7 operation. |
Use Scenario: Digitizing ECG, EEG, and respiration signals in bedside monitors where signal fidelity directly impacts clinical diagnosis. IC Role / Device Role / Timing Role: High-fidelity analog front-end ADC; configured for bipolar differential input to capture bidirectional bio-potentials with 73dB SINAD. Use Value: True differential T/H rejects common-mode interference from adjacent medical equipment; FIFO enables gapless waveform capture during µP servicing. |
| Data Logging for Environmental Sensors | Power Supply Supervision |
Use Scenario: Battery-powered remote nodes measuring ambient temperature, humidity, and air quality over months between charges. IC Role / Device Role / Timing Role: Low-power ADC managing periodic wake-up, conversion, and sleep; leverages AutoShutdown™ and internal clock mode 00. Use Value: 5µA shutdown current extends battery life; internal 4.096V reference ensures consistent scaling across temperature and aging without external components. |
Use Scenario: Real-time monitoring of rail voltages (+12V, +5V, +3.3V) and current sense in telecom power shelves and server PSUs. IC Role / Device Role / Timing Role: System supervisor ADC; scans multiple rails using internal FIFO and scan mode, reporting deviations via EOC-triggered interrupts. Use Value: 300ksps sampling captures transient overvoltage events; ±1 LSB DNL prevents false fault triggering during nominal operation near threshold limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200ksps, no internal reference, SO-8 package | Lacks FIFO, differential T/H, and internal reference; requires external op-amp and reference for comparable performance | Select only for cost-sensitive, lower-accuracy applications where 12-bit resolution and noise immunity are not required. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, internal reference (2.5V), TSSOP-28 | Higher channel count and speed but larger footprint; reference voltage mismatch (2.5V vs. 4.096V) affects full-scale scaling | Choose when >4 inputs are needed and board space permits larger package; recalculate gain stages due to different reference voltage. |
Compared with ADS7822U and AD7490BRUZ, the MAX11634EEE+ uniquely balances 12-bit precision, true differential acquisition, integrated 4.096V reference, and compact QSOP packaging-making it optimal for space-constrained, noise-immune industrial monitoring where channel count and speed requirements align precisely with its 4SE/2DIFF specification.
Availability
MAX11634EEE+ is available at Aetrix Electronics and suitable for industrial control systems, patient monitoring devices, and environmental data loggers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX11634EEE+ 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 communications applications.
The MAX11634EEE+ belongs to the MAX1163x family of low-power, multichannel SAR ADCs engineered for high-accuracy system supervision and sensor interfacing in electrically noisy, wide-temperature environments.
FAQ
What is the maximum sampling rate achievable with the MAX11634EEE+?
The MAX11634EEE+ achieves a maximum sampling rate of 300ksps when using an external clock in clock mode 11 with SCLK up to 4.8MHz. This rate is sustained across the full -40°C to +85°C operating range and supports full 12-bit accuracy with 73dB SINAD. Internal clock modes limit sampling to ≤100ksps due to oscillator tolerance and timing overhead.
Does the MAX11634EEE+ require an external reference voltage?
No, the MAX11634EEE+ does not require an external reference voltage because it integrates a precision 4.096V internal reference with ±0.7% initial accuracy and ±20ppm/°C temperature coefficient. REF+ and REF- pins may be left unconnected or bypassed with 0.1µF capacitors; the internal reference is automatically enabled unless an external source is applied to REF+.
How many analog input channels does the MAX11634EEE+ support?
The MAX11634EEE+ supports 4 single-ended analog inputs (AIN0–AIN3) or 2 true differential input pairs (AIN0/AIN1 and AIN2/AIN3). Unlike the MAX11636/MAX11637 variants, it does not provide AIN4–AIN7 or REF-/AIN6/CNVST/AIN7 multiplexing, making it purpose-built for compact 4-channel sensing applications.
What package type is used for the MAX11634EEE+?
The MAX11634EEE+ is supplied in a 16-pin QSOP (Quarter Size Outline Package) with 0.65mm lead pitch and dimensions of 5.3mm × 10.2mm. This RoHS-compliant, lead(Pb)-free package supports standard surface-mount assembly and offers thermal resistance θJA = 105°C/W on a single-layer board.
Can the MAX11634EEE+ perform bipolar differential measurements?
Yes, the MAX11634EEE+ supports bipolar differential measurements with an input range of ±VREF/2 = ±2.048V when configured in bipolar mode via the setup register. In this mode, output codes are delivered in two's complement format, enabling direct representation of negative differential voltages without software sign extension.
MAX11634EEE+ 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:
- 12
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, 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:
- -
MAX11634EEE+ FAQ
1.How can I place an order for MAX11634EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11634EEE+ 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 MAX11634EEE+ reliable?
The price and inventory of MAX11634EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11634EEE+ is usually 5 days.
3.What payment methods are accepted for MAX11634EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11634EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11634EEE+?
MAX11634EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11634EEE+ 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 MAX11634EEE+?
For technical support, including MAX11634EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11634EEE+ requirements.
6.How does Aetrix verify that MAX11634EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX11634EEE+ 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 MAX11634EEE+ meets industry standards.
7.What is the process for return or replacement of MAX11634EEE+?
All MAX11634EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11634EEE+, 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 MAX11634EEE+ part is unused and in its original packaging.
Return procedure for MAX11634EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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