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Analog Devices Inc./Maxim Integrated MAX1227BEEE+
- Part No.:
- MAX1227BEEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1227BEEE+.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,382
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Product details
Overview
MAX1227BEEE+ from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±0.7°C accuracy), 16-entry FIFO, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible interface. It features 8 single-ended or 4 true differential input channels, operates from a single +3V supply, and supports unipolar/bipolar modes - used in industrial data acquisition and system supervision where compact, low-power multichannel sensing is required.
For engineers reviewing the MAX1227BEEE+ datasheet, MAX1227BEEE+ pinout, MAX1227BEEE+ application, or MAX1227BEEE+ equivalent, this page delivers verified specifications, validated pin functions, confirmed operating conditions (-40°C to +85°C), real-world use cases, and two technically documented alternative parts - all grounded in Maxim's official documentation for reliable component selection.
Technical Context
The MAX1227BEEE+ employs a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, supporting both single-ended and true differential inputs. Its internal oscillator enables autonomous conversion timing in clock modes 00/01/10, while external SCLK up to 10MHz drives high-speed serial communication.
It integrates a dedicated temperature-sensing path using the internal reference, delivering 1/8°C resolution in two's complement format. The 16-deep FIFO buffers ADC results and temperature readings independently, allowing burst acquisition without serial bus contention - critical for deterministic sampling in embedded control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with no missing codes over temperature. |
| Max Sampling Rate | 300ksps with external clock - supports real-time monitoring of fast transients in industrial sensors. |
| INL / DNL | ±1 LSB integral and differential nonlinearity - ensures monotonicity and accurate voltage mapping across full scale. |
| Temp Sensor Accuracy | ±0.7°C at +25°C, ±1.2°C over -40°C to +85°C - enables direct board-level thermal management without calibration. |
| Reference | Internal 2.48–2.52V bandgap reference (±30ppm/°C TC) - eliminates need for external precision reference in cost-sensitive designs. |
| Digital Interface | 10MHz 3-wire SPI/QSPI/MICROWIRE-compatible - interoperable with standard microcontroller peripherals without protocol translation. |
| Supply Current | 1.75–2.0mA at 300ksps (internal ref), 0.2–5µA in shutdown - enables battery-powered or energy-constrained applications. |
Pinout & Package
MAX1227BEEE+ is packaged in a 16-pin QSOP (5.3mm × 10.2mm), RoHS-compliant and lead-free, rated for extended industrial temperature range (-40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No internal connection - must be left floating or tied to GND per layout best practice. |
| 2–7 | AIN0–AIN5 | Analog input channels - configurable as single-ended or true differential pairs (e.g., AIN0/AIN1); support unipolar (0–VREF) or bipolar (±VREF/2) ranges. |
| 8 | CNVST/AIN7 | Active-low conversion start input or analog input 7 - dual-function pin; when used as CNVST, triggers conversions without serial bus interaction. |
| 9 | REF- | Negative reference input or analog input 6 - selects external differential reference mode; if used as AIN6, REF- functionality is disabled. |
| 10 | REF+ | Positive reference input - accepts internal 2.5V reference or external 1.0V to VDD+50mV; requires 0.1µF bypass to GND. |
| 11 | GND | Analog/digital ground reference - shared return path for reference, analog inputs, and digital I/O; must be low-impedance. |
| 12 | VDD | +2.7V to +3.6V power supply - powers analog core, digital interface, and temperature sensor; requires 0.1µF bypass capacitor. |
| 13 | SCLK | Serial clock input - clocks data in/out on rising/falling edges; supports 40–60% duty cycle up to 10MHz. |
| 14 | CS | Active-low chip select - enables serial interface and places DOUT in high-impedance state when high. |
| 15 | DIN | Serial data input - latches 8-bit command bytes (MSB first) on rising SCLK edge for register configuration. |
| 16 | DOUT | Serial data output - outputs 16-bit result (MSB first, 4 leading zeros) on falling SCLK edge; tri-stated when CS = high. |
| - | EOC | End-of-conversion output - active-low signal indicates completion of last requested operation; not present on 16-pin QSOP package (MAX1227 only uses pins 1–16; EOC is omitted per pinout diagram). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | Delivers calibrated die temperature measurements (±0.7°C at +25°C) using internal reference - eliminates external sensor and reduces BOM count. |
| 16-entry FIFO buffer | Stores up to 16 ADC results plus one temperature reading - decouples sampling from host readout, enabling deterministic timing in interrupt-driven systems. |
| True differential input architecture | Supports 4 independent differential pairs (e.g., AIN0/AIN1) with common-mode rejection - improves noise immunity in electrically noisy industrial environments. |
| AutoShutdown™ mode | Reduces supply current to ≤5µA during idle periods - extends battery life in portable data loggers and remote sensors. |
| Configurable clock modes | Four selectable timing modes (CKSEL[1:0]) enable flexible triggering: internal timer, CNVST pulse, serial-command-initiated, or external SCLK-synchronized - adapts to diverse system architectures. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Multichannel voltage digitizer with on-chip temperature compensation and FIFO buffering for jitter-free sampling at 100–300ksps. Use Value: Reduces microcontroller polling overhead and eliminates external reference components - simplifies design and improves long-term measurement stability. |
Use Scenario: Compact bedside monitor acquiring ECG leads, respiration impedance, and skin temperature simultaneously. IC Role / Device Role / Timing Role: Low-power, isolated ADC with integrated temp sensor for patient-coupled analog front-end digitization. Use Value: Single-chip solution meets IEC 60601 creepage requirements via 16-pin QSOP spacing and eliminates separate temperature IC - saves PCB area and assembly cost. |
| Automated Test Equipment (ATE) | Energy Metering Subsystem |
|
Use Scenario: Modular DAQ card measuring voltage/current harmonics and DC offsets across multiple DUTs. IC Role / Device Role / Timing Role: High-accuracy SAR ADC with scan mode and internal averaging for repeatable RMS calculations. Use Value: ±1 LSB INL/DNL and 71dB SINAD ensure metrology-grade linearity - avoids recalibration drift in production test fixtures. |
Use Scenario: Secondary metering channel in smart electricity meters tracking auxiliary parameters (e.g., transformer temp, enclosure humidity). IC Role / Device Role / Timing Role: Auxiliary sensor hub ADC interfacing with thermistors, RTDs, and shunt-based current sense. Use Value: Internal 2.5V reference and ±0.7°C temp accuracy provide stable baseline for thermal derating algorithms - enhances safety margin compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 16-bit, 100ksps, no integrated temp sensor or FIFO; requires external reference; SPI-only interface. | Lacks on-chip temperature sensing and FIFO - necessitates additional ICs for thermal monitoring and burst acquisition. | Select when higher resolution (16-bit) outweighs integration benefits and system firmware can manage timing without hardware FIFO. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, no internal reference or temp sensor; uses external VREF; SPI-compatible. | Higher speed but no internal reference or temperature capability - increases BOM and layout complexity for reference decoupling and thermal sensing. | Choose for high-throughput applications where external reference stability is already managed and temperature is monitored separately. |
Compared with ADS8325IPW and AD7490BRUZ, the MAX1227BEEE+ trades raw speed or resolution for system-level integration - its internal reference, FIFO, and temperature sensor reduce component count and firmware burden in space- and power-constrained industrial and medical designs.
Availability
MAX1227BEEE+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, automated test equipment, and energy metering subsystems requiring stable component supply across extended temperature ranges.
Supply support for MAX1227BEEE+ 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 and mixed-signal ICs for industrial, medical, and communications applications - emphasizing integration, reliability, and low-power operation.
The MAX1227BEEE+ belongs to Maxim's high-accuracy SAR ADC family targeting embedded data acquisition where on-chip intelligence (FIFO, temp sensor, internal reference) reduces system complexity and improves time-to-market.
FAQ
What is the operating temperature range of the MAX1227BEEE+?
The MAX1227BEEE+ is specified for operation from -40°C to +85°C - the 'E' grade suffix explicitly denotes this extended industrial temperature range. This rating is validated across all electrical parameters including INL, DNL, reference stability, and temperature sensor accuracy, making it suitable for deployment in harsh environments such as factory floors or outdoor instrumentation enclosures.
Does the MAX1227BEEE+ include an internal voltage reference?
Yes, the MAX1227BEEE+ integrates a precision 2.5V bandgap reference with ±30ppm/°C temperature coefficient and 200µVRMS noise. It is enabled by default and used for both analog conversions and temperature measurements. An external differential reference (1.0V to VDD+50mV) may be substituted via REF+ and REF- pins when higher accuracy or custom scaling is required.
How many analog input channels does the MAX1227BEEE+ support?
The MAX1227BEEE+ supports 8 single-ended analog input channels (AIN0–AIN7) or 4 true differential input pairs (e.g., AIN0/AIN1). Channel configuration is controlled via the setup and conversion registers - each pair can be independently set to unipolar or bipolar mode, and unused pins (e.g., AIN6, AIN7) may be repurposed as CNVST or REF- depending on register settings.
What is the function of the FIFO in the MAX1227BEEE+?
The MAX1227BEEE+ contains a 16-deep FIFO that stores ADC conversion results and temperature readings. It allows up to 16 sequential conversions (plus one temperature sample) to complete autonomously before host readout - eliminating serial bus contention and enabling deterministic sampling intervals in real-time systems without CPU intervention.
Is the MAX1227BEEE+ compatible with standard SPI interfaces?
Yes, the MAX1227BEEE+ features a 3-wire serial interface fully compatible with SPI, QSPI, and MICROWIRE protocols. It supports CPOL = CPHA = 0 or 1, accepts SCLK up to 10MHz, and uses CS to enable the interface and DOUT/DIN for full-duplex data transfer - requiring no protocol translation when interfacing with common microcontrollers like STM32 or PIC series.
MAX1227BEEE+ 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:
- 4, 8
- Input Type:
- 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, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1227BEEE+ FAQ
1.How can I place an order for MAX1227BEEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1227BEEE+ 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 MAX1227BEEE+ reliable?
The price and inventory of MAX1227BEEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1227BEEE+ is usually 5 days.
3.What payment methods are accepted for MAX1227BEEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1227BEEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1227BEEE+?
MAX1227BEEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1227BEEE+ 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 MAX1227BEEE+?
For technical support, including MAX1227BEEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1227BEEE+ requirements.
6.How does Aetrix verify that MAX1227BEEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1227BEEE+ 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 MAX1227BEEE+ meets industry standards.
7.What is the process for return or replacement of MAX1227BEEE+?
All MAX1227BEEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1227BEEE+, 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 MAX1227BEEE+ part is unused and in its original packaging.
Return procedure for MAX1227BEEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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