My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1228AEEP+
- Part No.:
- MAX1228AEEP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1228AEEP+.pdf
- Description:
- IC ADC 12BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,247
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX1228AEEP+ 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, and internal 4.096V reference. It supports 12 single-ended or 6 true differential analog inputs in unipolar/bipolar modes and operates from a single +5V supply consuming 2.3mA at full speed. It is used in industrial control systems for multichannel voltage and temperature monitoring.
For engineers reviewing the MAX1228AEEP+ datasheet, MAX1228AEEP+ pinout, MAX1228AEEP+ application, or MAX1228AEEP+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, package-validated pin functions, and two confirmed alternative parts for system-level selection - all grounded in the official MAX1226/MAX1228/MAX1230 datasheet Rev 5.
Technical Context
The MAX1228AEEP+ implements a fully differential successive-approximation register (SAR) ADC architecture with integrated track-and-hold, supporting both single-ended and true differential input configurations. Its internal oscillator enables autonomous scan mode operation without external timing control.
It features a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface with programmable clock modes (CKSEL[1:0]), active-low EOC signaling, and configurable CNVST pin functionality - allowing flexible conversion triggering via hardware pulse or software register write.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise voltage quantization in measurement-critical applications. |
| Max Sampling Rate | 300ksps - supports high-speed transient capture in data-acquisition systems with undersampling capability up to 1MHz input bandwidth. |
| INL / DNL | ±1 LSB - guarantees monotonicity and no missing codes across -40°C to +85°C, essential for closed-loop control accuracy. |
| Temp Sensor Accuracy | ±1.2°C (full range) - enables reliable board-level thermal monitoring without external calibration. |
| Reference Voltage | Internal 4.096V ±1.7% - provides stable, low-drift scaling for ADC conversions; eliminates need for external precision reference in cost-sensitive designs. |
| Supply Current | 2.3mA at 300ksps - enables low-power operation in battery-backed or energy-constrained industrial nodes. |
| SPI Interface Speed | 10MHz - allows fast data retrieval from FIFO, reducing µP bus occupancy during burst acquisition sequences. |
Pinout & Package
The MAX1228AEEP+ is packaged in a 20-pin QSOP (0.154" wide) with standard lead pitch and RoHS-compliant finish. Pin 1 is marked by a beveled corner; exposed pad is not present (unlike QFN variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN9 | Analog Input Channels | 10 dedicated single-ended inputs; AIN0–AIN5 also serve as positive terminals for 6 true differential pairs (e.g., AIN0/AIN1). |
| REF-/AIN6 | Negative Reference / Analog Input | Configurable as REF- for external differential reference or as AIN6; mutually exclusive function per setup register. |
| CNVST/AIN7 | Conversion Start / Analog Input | Active-low hardware trigger for conversion; when enabled as CNVST, AIN7 is disabled - prevents signal conflict. |
| REF+ | Positive Reference Input | Accepts internal 4.096V reference or external reference; requires 0.1µF bypass capacitor to GND for stability. |
| GND / VDD | Ground / Power Supply | Separate analog/digital ground not required; single +5V supply simplifies power design and reduces BOM count. |
| SCLK / CS / DIN / DOUT | Serial Interface Signals | Standard 3-wire SPI-compatible interface; DOUT updates on SCLK falling edge, enabling deterministic read timing. |
| EOC | End-of-Conversion Output | Active-low open-drain signal indicates data readiness in clock modes 00/01/10; high-impedance in mode 11. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers up to 16 voltage conversions plus one temperature reading - decouples acquisition from µP servicing, enabling deterministic real-time response. |
| True differential track-and-hold | Rejects common-mode noise on matched input pairs (e.g., AIN2/AIN3), preserving signal integrity in electrically noisy industrial environments. |
| Internal temperature sensor | Delivers calibrated Celsius readings at 1/8°C resolution - eliminates external sensor and associated signal conditioning in thermal supervision circuits. |
| Scan mode with internal averaging | Automatically cycles through selected channels and averages N samples per result - improves SNR without µP intervention or firmware overhead. |
| AutoShutdown™ | Reduces supply current to ≤5µA during idle periods - extends operational life in intermittently active monitoring systems. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of thermocouple outputs, pressure transducer voltages, and ambient temperature in PLC-based factory automation. IC Role / Device Role / Timing Role: Multichannel ADC front-end with integrated temp sensor and FIFO - performs synchronized voltage + temperature sampling at 100ksps with minimal µP polling. Use Value: Reduces system latency by eliminating external multiplexer and reference ICs; internal averaging suppresses 50/60Hz line noise without digital filtering. | Use Scenario: Portable ECG and SpO₂ monitor acquiring lead voltages and skin temperature for arrhythmia detection and thermal compensation. IC Role / Device Role / Timing Role: Low-power, medical-grade ADC with bipolar differential input support - digitizes ±2.5V ECG signals while concurrently measuring patient temperature. Use Value: Single-supply +5V operation and ±1 LSB linearity ensure diagnostic-grade accuracy; AutoShutdown extends battery runtime between measurements. |
| Data Logger for Environmental Sensors | Power Supply Health Monitoring |
Use Scenario: Solar-powered remote node measuring soil moisture, air humidity, and enclosure temperature over multi-day intervals. IC Role / Device Role / Timing Role: Standalone ADC with internal reference and temperature sensing - acquires sensor outputs in low-duty-cycle bursts triggered by µP wake-up. Use Value: Internal 4.096V reference ensures consistent scaling across varying battery voltage; 2.3mA active current enables >1-year operation on 2000mAh Li-ion cell. | Use Scenario: Telecom rectifier shelf monitoring input AC voltage, DC output rails, fan tachometer, and heatsink temperature. IC Role / Device Role / Timing Role: System supervision ADC with 12-channel flexibility - scans critical analog points every 10ms while reporting thermal derating status. Use Value: True differential inputs reject ground bounce on noisy power planes; FIFO prevents data loss during µP interrupt latency spikes. |
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 internal reference or temp sensor; requires external REF and separate temperature IC. | Better resolution but lower speed and higher system complexity - suited for precision instrumentation, not compact embedded monitoring. | Select when absolute voltage accuracy >12-bit is mandatory and board space permits additional components. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, no internal temp sensor; uses external reference only; SPI interface at 20MHz. | Higher throughput and channel count, but lacks integrated temperature sensing - requires external thermal monitoring solution. | Choose for high-speed data acquisition where temperature is measured separately or omitted. |
Compared with ADS8325IPW and AD7490BRUZ, the MAX1228AEEP+ uniquely integrates temperature sensing, internal reference, and FIFO in a 20-pin QSOP - reducing component count and PCB area for compact, self-contained monitoring nodes requiring simultaneous voltage and thermal data.
Availability
MAX1228AEEP+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, environmental data loggers, and power supply health monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX1228AEEP+ 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 SAR ADCs with on-chip intelligence - targeting embedded systems needing concurrent analog voltage and temperature measurement without external support components.
FAQ
What is the operating temperature range specified for the MAX1228AEEP+?
The MAX1228AEEP+ is rated for operation from -40°C to +85°C, matching the extended industrial temperature grade denoted by the "E" in its ordering code. This range covers the full specification of DC accuracy (±1 LSB INL/DNL), dynamic performance (73dB SINAD), and temperature sensor error (±1.2°C), as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet Rev 5.
Does the MAX1228AEEP+ require an external reference voltage, or does it include an internal one?
The MAX1228AEEP+ includes a factory-trimmed internal 4.096V reference with ±1.7% initial accuracy and ±20ppm/°C temperature coefficient - sufficient for most industrial monitoring applications. An external differential reference can be applied via REF+ and REF-/AIN6 pins if higher precision or custom scaling is needed, but the internal reference remains active for temperature measurements regardless of configuration.
How many analog input channels does the MAX1228AEEP+ support, and what input configurations are available?
The MAX1228AEEP+ supports 12 single-ended analog inputs (AIN0–AIN11) or 6 true differential input pairs (e.g., AIN0/AIN1, AIN2/AIN3). Configuration is controlled via the setup register; each pair can be independently set to unipolar (0 to VREF) or bipolar (±VREF/2) mode. AIN6 and AIN7 are multifunction pins shared with REF- and CNVST, respectively, and their analog use is disabled when those functions are selected.
What is the purpose and capacity of the FIFO in the MAX1228AEEP+?
The MAX1228AEEP+ contains a 16-deep first-in/first-out (FIFO) buffer that stores 12-bit conversion results - holding up to 16 voltage samples plus one temperature reading. This allows autonomous scanning (e.g., 12-channel sequence at 300ksps) without µP intervention, reducing bus contention and enabling deterministic data retrieval. When full, new conversions overwrite the oldest entries, preventing overflow-induced system hangs.
Can the MAX1228AEEP+ perform temperature measurements, and how accurate are they?
Yes, the MAX1228AEEP+ integrates a calibrated on-die temperature sensor with ±1.2°C accuracy over the full -40°C to +85°C operating range and 1/8°C digital resolution. Temperature readings are delivered as two's complement values in the FIFO alongside voltage conversions and always use the internal reference - no external components or calibration are required for basic thermal supervision tasks.
MAX1228AEEP+ 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:
- Obsolete
- 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:
- -
MAX1228AEEP+ FAQ
1.How can I place an order for MAX1228AEEP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1228AEEP+ 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 MAX1228AEEP+ reliable?
The price and inventory of MAX1228AEEP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1228AEEP+ is usually 5 days.
3.What payment methods are accepted for MAX1228AEEP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1228AEEP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1228AEEP+?
MAX1228AEEP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1228AEEP+ 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 MAX1228AEEP+?
For technical support, including MAX1228AEEP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1228AEEP+ requirements.
6.How does Aetrix verify that MAX1228AEEP+ is sourced from the original manufacturer or authorized distributors?
All MAX1228AEEP+ 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 MAX1228AEEP+ meets industry standards.
7.What is the process for return or replacement of MAX1228AEEP+?
All MAX1228AEEP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1228AEEP+, 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 MAX1228AEEP+ part is unused and in its original packaging.
Return procedure for MAX1228AEEP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1228AEEP+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
