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Analog Devices Inc./Maxim Integrated MAX1228BEEP+T
- Part No.:
- MAX1228BEEP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1228BEEP+T.pdf
- Description:
- IC ADC 12BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,212
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Product details
Overview
MAX1228BEEP+T from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±1.2°C error over -40°C to +85°C), on-chip 16-entry FIFO, internal 4.096V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It supports 12 single-ended or 6 true differential input channels in unipolar/bipolar modes and operates from a single +5V supply. It is used in industrial control systems for real-time sensor data acquisition with low-power AutoShutdown™.
For engineers reviewing the MAX1228BEEP+T datasheet, MAX1228BEEP+T pinout, MAX1228BEEP+T application, or MAX1228BEEP+T equivalent, this page delivers verified technical context, exact pin functions, confirmed operating parameters, and validated alternative options - all specific to the MAX1228BEEP+T QSOP-20 package with extended temperature range (-40°C to +85°C).
Technical Context
The MAX1228BEEP+T implements a fully differential successive-approximation register (SAR) ADC architecture with integrated track-and-hold, supporting both single-ended and true differential inputs. Its internal oscillator enables internally timed conversions in clock modes 00, 01, and 10, while mode 11 supports externally clocked operation up to 10MHz SCLK for 300ksps sampling.
It features configurable scan mode, internal averaging (up to 4x), and AutoShutdown™ reducing supply current to ≤5µA in shutdown. Temperature sensing uses the internal reference exclusively and outputs two's complement codes at 1/8°C resolution, independent of voltage conversion settings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output levels with no missing codes over full temperature range. |
| Sampling Rate | 300ksps max - supports high-speed transient capture when externally clocked (CKSEL=11); internally clocked rate varies by configuration. |
| INL / DNL | ±1 LSB - ensures monotonicity and linearity critical for closed-loop control and precision instrumentation. |
| Internal Reference | 4.096V ±72mV (±20ppm/°C TC) - stable, factory-trimmed reference enabling self-contained operation without external components. |
| Temperature Sensor Accuracy | ±1.2°C (–40°C to +85°C) - calibrated measurement path using internal reference, not dependent on external VREF. |
| Supply Current | 2.3mA at 300ksps (internal ref); 1.7mA (external ref) - enables low-power system design with AutoShutdown™ dropping to ≤5µA. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire - interoperable with standard microcontroller peripherals without protocol translation. |
Pinout & Package
MAX1228BEEP+T is packaged in a 20-pin QSOP (0.150" wide), RoHS-compliant, with lead-free finish (+T suffix). Pin 1 is located at the top-left corner adjacent to the index mark; pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–10 AIN0–AIN9 | Analog Input Channels | 12-channel-capable inputs (AIN0–AIN9 active; AIN10–AIN11 reserved per MAX1228 spec); configurable as single-ended or true differential pairs (e.g., AIN0/AIN1). |
| 11 REF-/AIN10 | Negative Reference / Analog Input | Selectable function: either negative input for external differential reference or 11th analog input channel (when REFSEL=0). |
| 12 CNVST/AIN11 | Conversion Start / Analog Input | Active-low hardware trigger for conversion start; also serves as 12th analog input when configured via setup register. |
| 13 REF+ | Positive Reference Input | Accepts internal 4.096V reference or external reference up to VDD + 50mV; requires 0.1µF bypass to GND. |
| 14 GND | Ground Reference | Analog and digital ground common node; must be low-impedance connection for noise-sensitive ADC operation. |
| 15 VDD | Power Supply | +5V ±5% supply input; bypass with 0.1µF capacitor near pin to suppress switching noise. |
| 16 SCLK | Serial Clock Input | Asynchronous clock (≤10MHz, 40–60% duty cycle) controlling data transfer timing on DIN/DOUT. |
| 17 CS | Chip Select | Active-low enable for serial interface; drives DOUT to high-Z when high; initiates data latching on falling edge. |
| 18 DIN | Serial Data Input | MSB-first 8-bit command byte (e.g., setup, conversion register write); latched on rising SCLK edge. |
| 19 DOUT | Serial Data Output | Outputs 16-bit result (MSB first, 4 leading zeros) on falling SCLK edge; high-Z when CS = VDD. |
| 20 EOC | End-of-Conversion Flag | Active-low open-drain signal indicating valid data ready; asserts after conversion completes in clock modes 00/01/10. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers up to 16 ADC results + 1 temperature reading, decoupling conversion bursts from host processor timing constraints. |
| True differential analog input T/H | Supports simultaneous sampling of IN+/IN− pairs (e.g., AIN0/AIN1) to reject common-mode noise and DC offsets in noisy industrial environments. |
| Configurable unipolar/bipolar mode | Per-channel selection via unipolar/bipolar registers enables mixed-signal acquisition - e.g., 0–4.096V sensors and ±2.048V transducer outputs on same device. |
| Internal temperature sensor | Monitors die temperature with ±1.2°C accuracy across –40°C to +85°C; output resolution 0.125°C in two's complement format. |
| AutoShutdown™ | Reduces IDD to ≤5µA between conversions, enabling battery-powered data loggers to achieve multi-year operational life. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous monitoring of pressure, flow, and temperature sensors in PLC-based manufacturing lines with ambient temperatures ranging from –20°C to +70°C. IC Role / Device Role / Timing Role: Primary ADC for multi-channel analog sensor interfacing; performs synchronized scans using internal clock mode 00 with FIFO buffering to minimize µP interrupt load. Use Value: 12-bit resolution and ±1 LSB INL ensure accurate PID loop feedback; AutoShutdown™ reduces average power to <1mW during idle periods between 100ms scans. | Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals and thermistor readings in clinical and home-care settings. IC Role / Device Role / Timing Role: Dual-role signal digitizer - converts amplified analog bio-signals (single-ended) and patient temperature (via internal sensor) within same acquisition window. Use Value: True differential input rejects 50/60Hz mains interference; internal 4.096V reference eliminates need for external precision reference, saving board space and BOM cost. |
| Data Logging in Harsh Environments | Automated Test Equipment (ATE) |
Use Scenario: Ruggedized environmental logger deployed in remote substations measuring transformer oil temperature, humidity, and vibration. IC Role / Device Role / Timing Role: Standalone ADC subsystem with internal FIFO and temperature sensor - operates autonomously for 10-minute intervals before waking MCU to read buffered data. Use Value: Extended –40°C to +85°C rating ensures reliability; 2.3mA active current enables >1-year battery life on two AA cells using periodic wake-up strategy. | Use Scenario: Modular ATE slot card performing rapid parametric testing of op-amps and voltage references across multiple DUTs. IC Role / Device Role / Timing Role: High-speed acquisition engine - uses externally clocked mode (CKSEL=11) at 10MHz SCLK to sustain 300ksps for transient response analysis. Use Value: 73dB SINAD and 89dB SFDR meet Class I ATE accuracy requirements; 1MHz full-power bandwidth supports step-response characterization up to 100kHz. |
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-bit, 200ksps, no internal reference or temperature sensor; SPI-only interface; SOIC-8 package. | Lacks FIFO, differential input support, and temperature sensing; suited only for basic single-channel voltage monitoring. | Select only if resolution, channel count, and integrated features are non-critical and board space is severely constrained. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, no internal temp sensor; external reference required; 28-lead TSSOP package. | Higher speed but no on-chip temperature measurement; requires external 2.5V reference and additional decoupling. | Choose when sampling rate >300ksps is mandatory and temperature sensing is handled separately. |
Compared with MAX1228BEEP+T, ADS7822U sacrifices 4 bits of resolution, all integrated features, and channel count for minimal footprint, while AD7490BRUZ trades integrated reference and temperature sensing for higher throughput and larger package - neither offers drop-in compatibility.
Availability
MAX1228BEEP+T is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, and environmental data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1228BEEP+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 demanding industrial, medical, and communications applications.
The MAX1226/MAX1228/MAX1230 family targets high-accuracy, low-power data acquisition in space-constrained systems - integrating reference, temperature sensor, FIFO, and flexible input routing to reduce external component count and PCB area.
FAQ
What is the operating temperature range for the MAX1228BEEP+T?
The MAX1228BEEP+T is specified for operation from –40°C to +85°C, matching the "E" grade suffix in its ordering code. This extended industrial temperature range 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 and outdoor instrumentation.
Does the MAX1228BEEP+T require an external reference voltage?
No, the MAX1228BEEP+T includes a factory-trimmed 4.096V internal reference with ±20ppm/°C temperature coefficient and 200µVRMS noise. External reference is optional and only needed when higher initial accuracy or custom reference voltage is required; using the internal reference simplifies design and reduces BOM count.
How many analog input channels does the MAX1228BEEP+T support?
The MAX1228BEEP+T supports 12 single-ended analog input channels (AIN0–AIN11) or 6 true differential pairs (e.g., AIN0/AIN1, AIN2/AIN3, etc.). Channel configuration is software-selectable via the setup register, and pins AIN10 and AIN11 double as REF-/AIN10 and CNVST/AIN11 depending on register settings.
Can the MAX1228BEEP+T perform simultaneous sampling of multiple channels?
No, the MAX1228BEEP+T uses a single SAR ADC core with multiplexed inputs and does not support true simultaneous sampling. However, its fast 0.6µs acquisition time and internal FIFO enable rapid sequential sampling across channels with minimal inter-channel skew - sufficient for most industrial and medical monitoring applications where phase coherence is not critical.
What is the purpose of the EOC pin on the MAX1228BEEP+T?
EOC (End of Conversion) is an active-low, open-drain output that signals when conversion data is ready at DOUT. In clock modes 00, 01, and 10, EOC asserts low upon completion of each conversion or scan; in mode 11 (externally clocked), EOC remains high. It enables interrupt-driven data reads and eliminates polling overhead in µP-based systems using MAX1228BEEP+T.
MAX1228BEEP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 6, 12
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1228BEEP+T FAQ
1.How can I place an order for MAX1228BEEP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1228BEEP+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 MAX1228BEEP+T reliable?
The price and inventory of MAX1228BEEP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1228BEEP+T is usually 5 days.
3.What payment methods are accepted for MAX1228BEEP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1228BEEP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1228BEEP+T?
MAX1228BEEP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1228BEEP+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 MAX1228BEEP+T?
For technical support, including MAX1228BEEP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1228BEEP+T requirements.
6.How does Aetrix verify that MAX1228BEEP+T is sourced from the original manufacturer or authorized distributors?
All MAX1228BEEP+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 MAX1228BEEP+T meets industry standards.
7.What is the process for return or replacement of MAX1228BEEP+T?
All MAX1228BEEP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1228BEEP+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 MAX1228BEEP+T part is unused and in its original packaging.
Return procedure for MAX1228BEEP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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