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Analog Devices Inc./Maxim Integrated MAX1228BCEP+
- Part No.:
- MAX1228BCEP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1228BCEP+.pdf
- Description:
- IC ADC 12BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,832
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Product details
Overview
MAX1228BCEP+ from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±0.7°C accuracy at +25°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 data-acquisition systems requiring high-accuracy, low-power, multichannel voltage and temperature monitoring.
For engineers reviewing the MAX1228BCEP+ datasheet, MAX1228BCEP+ pinout, MAX1228BCEP+ application, or MAX1228BCEP+ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated QSOP-20 pin functions, confirmed alternatives with functional trade-offs, and supply-chain support for embedded instrumentation and system supervision designs.
Technical Context
The MAX1228BCEP+ uses a fully differential successive-approximation register (SAR) architecture with integrated track-and-hold, supporting both single-ended and true differential inputs. Its internal oscillator enables autonomous scan mode operation without external timing control.
It implements configurable clock modes (CKSEL[1:0]) to support conversion start via CNVST pin (mode 00/01), serial register write (mode 10), or externally clocked acquisition (mode 11). Temperature sensing always uses the internal reference and outputs two's complement codes at 1/8°C resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB INL/DNL accuracy over -40°C to +85°C, ensuring no missing codes in production environments. |
| Sampling Rate | 300ksps max with external clock - enables high-speed transient capture in process-control loop monitoring. |
| Input Channels | 12 single-ended or 6 true differential - supports scalable sensor arrays without external multiplexers. |
| Internal Reference | 4.096V ±1.7% (±20ppm/°C TC) - eliminates need for external precision reference in cost-sensitive designs. |
| Temperature Sensor | ±0.7°C error at +25°C, ±1.2°C over full range - provides reliable board-level thermal monitoring without calibration. |
| Supply Current | 2.3mA at 300ksps, 1.6mA typical - enables battery-backed or energy-constrained industrial nodes. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire - interoperates with legacy microcontrollers without protocol translation. |
Pinout & Package
MAX1228BCEP+ is housed in a 20-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), RoHS-compliant and lead-free. The exposed pad is absent - only present in TQFN variants (e.g., MAX1230).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–10 | AIN0–AIN9 | Analog input channels - configurable as single-ended or true differential pairs (e.g., AIN0/AIN1); AIN8–AIN9 available only on MAX1228/MAX1230. |
| 11 | REF-/AIN10 | Negative reference input or analog channel 10 - dual-function pin; REF- mode disables AIN10 usage. |
| 12 | CNVST/AIN11 | Active-low conversion start or analog channel 11 - pulse-triggered sampling decouples timing from serial bus activity. |
| 13 | REF+ | Positive reference input - requires 0.1µF bypass to GND; accepts internal 4.096V ref or external differential reference. |
| 14 | GND | Analog/digital ground - common return for reference, analog inputs, and digital I/O; must be low-impedance. |
| 15 | VDD | +5V power supply - bypassed with 0.1µF capacitor; supports 4.75V–5.25V range with <±1.4mV PSR impact. |
| 16 | SCLK | Serial clock input - 10MHz max, 40–60% duty cycle; controls data latching on rising edge and output on falling edge. |
| 17 | CS | Active-low chip select - enables serial interface and tri-states DOUT when high; initiates DIN data load on high-to-low transition. |
| 18 | DIN | Serial data input - accepts 8-bit setup byte (MSB first) followed by optional configuration bytes per Tables 1–7. |
| 19 | DOUT | Serial data output - outputs 16-bit result (MSB-first, 4 leading zeros) after EOC assertion; high-impedance when CS = VDD. |
| 20 | EOC | End-of-conversion flag - active-low pulse signals valid data ready; behavior varies by clock mode (e.g., per-scan in mode 01). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers up to 16 ADC results + 1 temp reading - enables burst acquisition without CPU intervention or serial bus contention. |
| Internal temperature sensor | ±0.7°C accuracy at +25°C, 1/8°C resolution - delivers calibrated die temperature for thermal management without external sensors. |
| Scan mode & internal averaging | Configurable NSCAN[1:0] and NAVG[1:0] registers - automates multi-channel sequencing and noise reduction across up to 12 inputs. |
| True differential track-and-hold | Supports AIN0/AIN1, AIN2/AIN3…AIN10/AIN11 pairs - rejects common-mode noise and DC offsets in noisy industrial environments. |
| AutoShutdown™ | Reduces supply current to ≤5µA in shutdown - extends battery life in portable data loggers between measurement cycles. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
|
Use Scenario: Continuous logging of pressure, flow, and temperature signals from multiple transducers in PLC-based control cabinets. IC Role / Device Role / Timing Role: Central multichannel ADC performing synchronized voltage and on-die temperature sampling at 100ksps, feeding data to ARM Cortex-M4 host via SPI. Use Value: Eliminates external multiplexer and reference ICs while maintaining ±1 LSB linearity across 12 sensor inputs and ambient thermal compensation. |
Use Scenario: Portable ECG/SpO₂ monitor acquiring biopotential signals and battery/ambient temperature in clinical-grade wearable devices. IC Role / Device Role / Timing Role: Low-power ADC digitizing differential electrode pairs and internal thermal sensor, operating from coin-cell supply with AutoShutdown between readings. Use Value: Achieves medical-grade 73dB SINAD and ±0.7°C thermal accuracy without external calibration or precision reference components. |
| Automated Test Equipment (ATE) | Energy Metering Front-End |
|
Use Scenario: Modular DAQ card capturing transient waveforms from DUTs during functional testing, with real-time temperature derating. IC Role / Device Role / Timing Role: High-speed 300ksps ADC with FIFO buffering and internal clock mode - enables trigger-driven burst capture independent of host controller latency. Use Value: Reduces firmware overhead by offloading channel sequencing and averaging, while internal reference ensures consistent gain across temperature. |
Use Scenario: Smart meter measuring voltage/current harmonics and PCB thermal drift across 10-year field deployment. IC Role / Device Role / Timing Role: Precision ADC converting isolated CT/PT outputs and onboard thermal sensor, using internal 4.096V reference for long-term ratio-metric stability. Use Value: Delivers 89dB SFDR and ±1 LSB INL over extended temperature, enabling Class 0.5 metering compliance without external trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200ksps, 8-channel, no internal reference or temperature sensor; SPI interface only. | Lacks FIFO, internal ref, and thermal sensing - requires external ref and separate temp IC for equivalent functionality. | Select when lower sampling rate suffices and board space allows discrete reference/temp solution. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, internal ref, no integrated temp sensor; 2.7–5.25V supply. | Higher speed and channel count but no on-die temperature measurement - needs external thermal monitoring. | Choose for high-throughput industrial DAQ where thermal sensing is handled separately. |
Compared with MAX1228BCEP+, ADS7822U offers lower power but omits critical integrated features (FIFO, temp sensor, internal ref), while AD7490BRUZ trades thermal integration for higher speed and channel density - making MAX1228BCEP+ uniquely suited for compact, self-contained temperature-aware acquisition.
Availability
MAX1228BCEP+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1228BCEP+ 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 product line delivers integrated, low-power, multichannel ADCs with on-chip temperature sensing and FIFO for system supervision and embedded data-acquisition applications.
FAQ
What is the operating temperature range for the MAX1228BCEP+?
The MAX1228BCEP+ is specified for the commercial temperature range of 0°C to +70°C, as indicated by the "C" in its ordering code. It maintains full performance - including ±1 LSB INL/DNL, ±0.7°C temperature sensor accuracy at +25°C, and 300ksps sampling - across this range. For extended industrial use (-40°C to +85°C), the MAX1228BEEP+ variant is required.
Does the MAX1228BCEP+ require an external reference voltage?
No, the MAX1228BCEP+ includes an internal 4.096V reference with ±1.7% initial accuracy and ±20ppm/°C temperature coefficient. It can operate fully autonomously using this reference. However, it also supports external differential reference inputs (REF+/REF-) for applications requiring higher precision or ratiometric measurements against a system-level reference.
How many analog input channels does the MAX1228BCEP+ support?
The MAX1228BCEP+ supports 12 single-ended analog input channels (AIN0–AIN11) or 6 true differential channel pairs (e.g., AIN0/AIN1, AIN2/AIN3, ..., AIN10/AIN11). Channel configuration is controlled via the setup and conversion registers, and all channels are software-selectable for unipolar or bipolar operation.
What is the purpose of the FIFO buffer in the MAX1228BCEP+?
The MAX1228BCEP+ integrates a 16-entry FIFO that stores ADC conversion results - including up to one temperature reading - enabling autonomous burst acquisition without continuous CPU polling. This reduces serial bus traffic and host processor load, especially during scan mode or internal averaging operations, and prevents data loss when the host is temporarily unavailable.
Can the MAX1228BCEP+ perform simultaneous temperature and voltage conversions?
Yes, the MAX1228BCEP+ can interleave temperature and voltage conversions within a single scan sequence. When the TEMP bit is set in the conversion register, the device inserts one temperature reading into the FIFO alongside requested analog channel results. Temperature measurement always uses the internal reference and outputs two's complement codes at 1/8°C resolution.
MAX1228BCEP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1228BCEP+ FAQ
1.How can I place an order for MAX1228BCEP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1228BCEP+ 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 MAX1228BCEP+ reliable?
The price and inventory of MAX1228BCEP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1228BCEP+ is usually 5 days.
3.What payment methods are accepted for MAX1228BCEP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1228BCEP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1228BCEP+?
MAX1228BCEP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1228BCEP+ 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 MAX1228BCEP+?
For technical support, including MAX1228BCEP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1228BCEP+ requirements.
6.How does Aetrix verify that MAX1228BCEP+ is sourced from the original manufacturer or authorized distributors?
All MAX1228BCEP+ 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 MAX1228BCEP+ meets industry standards.
7.What is the process for return or replacement of MAX1228BCEP+?
All MAX1228BCEP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1228BCEP+, 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 MAX1228BCEP+ part is unused and in its original packaging.
Return procedure for MAX1228BCEP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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