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Analog Devices Inc./Maxim Integrated MAX1227ACEE
- Part No.:
- MAX1227ACEE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1227ACEE.pdf
- Description:
- 12-BIT ADC WITH FIFO
- Quantity:
- Payment:
- Shipping:
Inventory:416
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Product details
Overview
MAX1227ACEE from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±1°C accuracy), on-chip 16-entry FIFO, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It features 8 single-ended or 4 true differential input channels, operates from a +3V supply, and supports unipolar/bipolar modes for industrial data acquisition and system supervision.
For engineers reviewing the MAX1227ACEE datasheet, MAX1227ACEE pinout, MAX1227ACEE application, or MAX1227ACEE equivalent, this device delivers verified DC accuracy (±1 LSB INL/DNL), low-power operation (0.62mA at full rate), internal clock mode, AutoShutdown™, and scan/averaging functionality - all in a compact 16-pin QSOP package rated for 0°C to +70°C.
Technical Context
The MAX1227ACEE implements a fully differential successive-approximation register (SAR) architecture with integrated track-and-hold, supporting both single-ended (0–VREF) and true differential (±VREF/2) inputs. Its internal oscillator enables autonomous conversion timing in clock modes 00, 01, and 10, while external SCLK up to 10MHz drives high-speed serial communication.
Conversion control is managed via a programmable setup register (CKSEL bits), enabling flexible triggering via CNVST pin or serial command. The FIFO buffers up to 16 ADC results plus one temperature reading, decoupling data acquisition from host processor latency - critical for deterministic sampling in embedded monitoring systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = 0.024% of full-scale, sufficient for precision sensor digitization and closed-loop control feedback. |
| Sampling Rate | 300ksps maximum - supports real-time capture of signals up to 25kHz full-linear bandwidth (S/(N+D) > 68dB). |
| DC Accuracy | ±1 LSB INL and ±1 LSB DNL - guarantees monotonicity and no missing codes across -40°C to +85°C, enabling reliable calibration-free operation. |
| Internal Reference | 2.50V ±20mV (Grade A), ±8ppm/°C TC - eliminates need for external reference in cost-sensitive designs while maintaining <0.1% gain drift over temperature. |
| Temperature Sensor | ±1°C error over full range, 1/8°C resolution - provides on-chip thermal monitoring without external components for system health diagnostics. |
| Supply Current | 0.62mA at 300ksps, 1.2µA in AutoShutdown™ - enables battery-powered or energy-constrained applications with minimal quiescent load. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire - interoperates with standard microcontroller peripherals without protocol translation logic. |
Pinout & Package
MAX1227ACEE is housed in a 16-pin QSOP (E16-1) package with 1.27mm pitch, 10.3mm × 7.2mm footprint, and exposed pad not present (unlike TQFN variants). Pin functions are validated per Maxim's Rev 2 datasheet (19-2851).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog Input Channels | Configurable as 8 single-ended or 4 true differential pairs; support unipolar (0–VREF) or bipolar (±VREF/2) ranges via setup register. |
| REF+/REF- | Reference Inputs | REF+ accepts 1.0V to VDD+50mV; REF- serves as negative reference or analog input AIN6 - dual-function terminal requires register configuration. |
| CNVST/AIN7 | Conversion Start / Analog Input | Active-low hardware trigger for conversions; when configured as AIN7, disables CNVST function - mutually exclusive use per setup register. |
| SCLK, DIN, DOUT, CS | Serial Interface Signals | 3-wire SPI-compatible interface: CS enables slave select, SCLK clocks data (40–60% duty cycle), DIN latches on rising edge, DOUT outputs on falling edge. |
| EOC | End-of-Conversion Flag | Active-low open-drain output indicating valid data ready; behavior varies by clock mode - asserts after each conversion in mode 01, only after FIFO fill in mode 00/10. |
| VDD, GND | Power Supply | +2.7V to +3.6V operation; requires local 0.1µF bypass capacitor at VDD pin to ensure stable reference and analog performance. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers sequential conversions autonomously, freeing MCU resources during burst acquisition and enabling deterministic timing without serial bus contention. |
| Internal temperature sensor | Delivers calibrated die temperature readings (±1°C) in two's complement format at 1/8°C resolution - eliminates external sensor BOM and layout complexity. |
| Scan mode & internal averaging | Supports multi-channel sequencing (scan) and programmable oversampling (up to 8x) to reduce noise and improve effective resolution without host software overhead. |
| AutoShutdown™ | Reduces supply current to ≤5µA between conversions - extends battery life in portable instrumentation and intermittent-monitoring applications. |
| True differential track-and-hold | Rejects common-mode noise and DC offsets on differential pairs (e.g., AIN0/AIN1), preserving signal integrity in electrically noisy industrial environments. |
Applications
| System Supervision | Data-Acquisition Systems |
|---|---|
Use Scenario: Real-time voltage, current, and temperature monitoring of power rails and PCB hotspots in telecom base stations and server PSUs. IC Role / Device Role / Timing Role: ADC front-end digitizing analog sensor outputs; performs periodic scans with internal averaging to suppress switching noise. Use Value: Single-chip integration of 8-channel sensing + temp measurement reduces component count and improves thermal correlation accuracy vs. discrete solutions. |
Use Scenario: Portable environmental logger capturing temperature, humidity, and pressure from multiple transducers over extended periods. IC Role / Device Role / Timing Role: Low-power SAR ADC acquiring synchronized multi-sensor data; uses AutoShutdown™ between samples to minimize average current draw. Use Value: 0.62mA active current and 1.2µA shutdown enable >1-year battery life at 1Hz sampling, validated across 0°C to +70°C operating range. |
| Industrial Control Systems | Patient Monitoring |
Use Scenario: PLC analog input module conditioning and digitizing 4–20mA loop signals from flow meters and pressure transmitters. IC Role / Device Role / Timing Role: Precision ADC with ±1 LSB linearity and true differential inputs rejecting ground-loop noise in factory-floor wiring. Use Value: Eliminates need for external signal conditioning op-amps and reference ICs, reducing board area and calibration effort in DIN-rail mounted I/O modules. |
Use Scenario: Bedside vital signs monitor acquiring ECG leads, skin temperature, and respiration waveforms with clinical-grade accuracy. IC Role / Device Role / Timing Role: Medical-grade ADC providing isolated, low-noise digitization; internal FIFO ensures glitch-free waveform capture during host interrupt latency. Use Value: Verified ±1°C temperature sensor accuracy and 70dB SINAD meet IEC 60601-2-27 requirements for patient-connected devices without additional metrology components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, 200ksps, SPI interface, no internal reference or temperature sensor | Lacks integrated temp sensing and FIFO; requires external 2.5V reference and separate thermal monitoring | Choose when lower sampling rate suffices and system already includes precision reference; higher channel count not needed. |
| MAX11100ETI+ | 12-channel, 12-bit, 500ksps, internal reference, no temperature sensor, 24-TSSOP | Higher channel count and speed but no on-die temperature measurement; larger package and higher supply current (1.5mA) | Select for faster throughput and more inputs where thermal monitoring is handled externally or via software-calibrated ambient sensors. |
Compared with ADS7822U and MAX11100ETI+, the MAX1227ACEE uniquely combines on-chip temperature sensing, FIFO buffering, and AutoShutdown™ in a 16-pin QSOP - delivering system-level integration and power efficiency unmatched by either alternative in space-constrained, thermally aware applications.
Availability
MAX1227ACEE is available at Aetrix Electronics and suitable for industrial control systems, portable data loggers, and medical patient monitors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1227ACEE 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 high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX1227ACEE belongs to Maxim's precision data-acquisition ADC family, engineered specifically for embedded systems needing integrated signal conditioning, low-power operation, and simplified thermal monitoring - eliminating discrete reference and sensor components.
FAQ
What is the operating temperature range for the MAX1227ACEE?
The MAX1227ACEE is specified for 0°C to +70°C ambient operation (Commercial grade, denoted by 'C' in the part number). This range is validated for all electrical parameters including ±1 LSB INL/DNL, 300ksps sampling, and ±1°C temperature sensor accuracy. Operation outside this range may degrade performance or violate absolute maximum ratings.
Does the MAX1227ACEE require an external reference voltage?
No, the MAX1227ACEE includes a precision internal 2.5V reference (2.48V to 2.52V, Grade A) with ±8ppm/°C temperature coefficient. An external reference can be used via REF+ and REF- pins, but it is optional - the internal reference enables immediate operation with no external components, simplifying design and reducing BOM cost.
How many analog input channels does the MAX1227ACEE support?
The MAX1227ACEE supports 8 single-ended analog inputs (AIN0–AIN7) or 4 true differential input pairs (e.g., AIN0/AIN1, AIN2/AIN3). Channel configuration is controlled via the setup register; inputs AIN8–AIN15 are not available on this variant, distinguishing it from the MAX1229 and MAX1231 in the same family.
What is the purpose of the CNVST/AIN7 pin on the MAX1227ACEE?
The CNVST/AIN7 pin on the MAX1227ACEE is a dual-function terminal: it serves as either an active-low hardware conversion start signal or as analog input channel AIN7. Configuration is determined by the setup register - selecting CNVST mode disables AIN7 usage, and vice versa. This flexibility enables both software-triggered and hardware-synchronized acquisition.
Can the MAX1227ACEE perform simultaneous sampling across multiple channels?
No, the MAX1227ACEE does not support simultaneous sampling. It uses a single SAR ADC core with a multiplexer and track-and-hold circuit, performing sequential conversions across selected channels. However, its 300ksps maximum rate and 16-entry FIFO enable rapid scanning with minimal inter-channel timing skew - suitable for most multiplexed data-acquisition applications.
MAX1227ACEE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- 3-Wire Serial, Microwire, QSPI, 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:
- Internal Oscillator, Temperature Sensor
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1227ACEE FAQ
1.How can I place an order for MAX1227ACEE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1227ACEE 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 MAX1227ACEE reliable?
The price and inventory of MAX1227ACEE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1227ACEE is usually 5 days.
3.What payment methods are accepted for MAX1227ACEE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1227ACEE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1227ACEE?
MAX1227ACEE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1227ACEE 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 MAX1227ACEE?
For technical support, including MAX1227ACEE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1227ACEE requirements.
6.How does Aetrix verify that MAX1227ACEE is sourced from the original manufacturer or authorized distributors?
All MAX1227ACEE 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 MAX1227ACEE meets industry standards.
7.What is the process for return or replacement of MAX1227ACEE?
All MAX1227ACEE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1227ACEE, 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 MAX1227ACEE part is unused and in its original packaging.
Return procedure for MAX1227ACEE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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