My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1228ACEP+
- Part No.:
- MAX1228ACEP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1228ACEP+.pdf
- Description:
- IC ADC 12BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,202
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX1228ACEP+ 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 analog inputs in unipolar/bipolar modes and operates from a single +5V supply. It is used in industrial control systems for multichannel voltage and temperature monitoring with minimal microprocessor overhead.
For engineers reviewing the MAX1228ACEP+ datasheet, MAX1228ACEP+ pinout, MAX1228ACEP+ application, or MAX1228ACEP+ equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, and two confirmed alternative parts with documented functional and packaging differences - all grounded in Maxim's official datasheet Rev 5 (12/10).
Technical Context
The MAX1228ACEP+ 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 conversion timing in clock modes 00, 01, and 10, while external SCLK up to 10MHz controls data I/O independent of conversion timing.
It integrates an on-chip temperature sensor with 1/8°C resolution and ±1.2°C accuracy across -40°C to +85°C, always referenced to its internal 4.096V reference. The 16-deep FIFO buffers ADC results and temperature readings, allowing burst acquisition without serial bus contention - critical for deterministic sampling in real-time embedded control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB INL/DNL accuracy with no missing codes over full temperature range. |
| Sampling Rate | 300ksps max with external clock - supports high-speed transient capture in process monitoring. |
| Analog Inputs | 12 single-ended or 6 true differential channels - configurable per setup register for flexible signal routing. |
| Internal Reference | 4.096V ±72mV (±20ppm/°C TC) - eliminates need for external precision reference in cost-sensitive designs. |
| Temperature Sensor | ±1.2°C error over -40°C to +85°C, 1/8°C resolution - enables direct board-level thermal supervision without calibration. |
| Supply Current | 2.3mA at 300ksps, 1.7mA typical - enables low-power operation in battery-backed or energy-constrained systems. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire - interoperable with standard microcontroller peripherals without protocol translation. |
Pinout & Package
MAX1228ACEP+ is housed in a 20-pin QSOP package (5.3mm × 10.2mm body, 0.65mm pitch), RoHS-compliant and lead-free. Pin 1 is marked with a dot; exposed pad is not present (EP only applies to TQFN variants like MAX1230).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN5 | Analog Input Channels | Primary single-ended inputs; also form differential pairs AIN0/AIN1 through AIN4/AIN5 when configured. |
| REF-/AIN6 | Negative Reference / Analog Input | Selectable function: either negative input for external differential reference or sixth analog input channel. |
| CNVST/AIN7 | Conversion Start / Analog Input | Active-low hardware trigger for conversions; alternatively serves as seventh analog input when not used as CNVST. |
| REF+ | Positive Reference Input | Accepts internal 4.096V reference or external reference; requires 0.1µF bypass to GND for stability. |
| GND | Analog/Digital Ground | Common return for analog and digital sections; must be connected to low-impedance ground plane. |
| VDD | +5V Power Supply | Single 4.75V–5.25V supply; requires local 0.1µF ceramic bypass capacitor. |
| SCLK | Serial Clock Input | Controls data transfer timing; supports 10MHz max frequency with 40–60% duty cycle. |
| CS | Chip Select | Active-low enable for serial interface; places DOUT in high-impedance state when high. |
| DIN | Serial Data Input | Latches 8-bit command bytes on rising SCLK edge; used for register writes and configuration. |
| 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 Flag | Active-low open-drain output signaling completion of conversion sequence; asserted after each result in clock mode 01. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Enables autonomous multi-channel scanning without CPU intervention - reduces firmware latency in data-acquisition systems. |
| True differential track-and-hold | Rejects common-mode noise and DC offsets on differential pairs - improves measurement integrity in electrically noisy industrial environments. |
| Internal temperature sensor | Provides calibrated thermal monitoring with no external components - simplifies thermal management in compact embedded controllers. |
| AutoShutdown™ mode | Reduces supply current to ≤5µA during idle periods - extends operational life in intermittent-sampling applications like remote sensors. |
| Configurable clock modes | Four selectable timing architectures (internal/external trigger, scan/averaging) - allows optimization for deterministic latency, power, or throughput. |
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 with integrated temp sensor performs synchronized voltage and temperature sampling at 100ksps, feeding data to ARM Cortex-M4 via SPI. Use Value: Eliminates external reference and discrete temperature IC, reducing BOM count by 2 components while maintaining ±1 LSB linearity and ±1.2°C thermal accuracy. | Use Scenario: Portable ECG and SpO₂ monitor acquiring lead voltages and skin temperature for arrhythmia detection. IC Role / Device Role / Timing Role: Simultaneous 6-channel differential ECG signal digitization plus on-board temperature compensation using internal sensor. Use Value: Single-supply +5V operation and AutoShutdown™ extend battery runtime; FIFO buffering ensures no sample loss during Bluetooth LE packet transmission gaps. |
| Data Logger for Environmental Sensors | Power Supply Health Monitoring |
Use Scenario: Solar-powered remote node measuring soil moisture, air humidity, and enclosure temperature over 24-hour cycles. IC Role / Device Role / Timing Role: Low-power ADC triggers temperature measurement every 5 minutes and voltage scans every 30 seconds using internal clock mode 00. Use Value: Internal 4.096V reference ensures stable scaling across supply voltage drift (4.75–5.25V); shutdown current <5µA preserves battery charge between acquisitions. | Use Scenario: Telecom rectifier shelf monitoring input AC phase voltages, DC output ripple, and heatsink temperature. IC Role / Device Role / Timing Role: High-accuracy ADC digitizes 12 analog points including isolated current shunt signals and thermal diode outputs. Use Value: True differential inputs reject common-mode noise from switching power stages; ±1 LSB INL guarantees precise regulation feedback without calibration. |
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 resolution, no internal temp sensor, 200ksps max, SOIC-8 package | Lacks FIFO, differential capability, and temperature sensing - suitable only for basic single-channel voltage monitoring. | Select only if resolution, channel count, and thermal awareness are non-critical and PCB space is constrained. |
| AD7490BRUZ | 12-bit, 16-channel, SPI interface, but no internal reference or temp sensor; requires external 2.5V ref and separate thermal IC. | Higher channel count but adds BOM complexity and calibration burden - better for high-channel-count systems with existing reference infrastructure. | Choose when system already uses precision external references and thermal sensing is handled separately. |
Compared with ADS7822U and AD7490BRUZ, the MAX1228ACEP+ uniquely integrates temperature sensing, internal reference, FIFO, and true differential inputs in a single 20-pin QSOP - reducing component count, calibration effort, and layout area for compact industrial and medical data-acquisition designs.
Availability
MAX1228ACEP+ is available at Aetrix Electronics and suitable for industrial control systems, patient monitoring devices, and environmental data loggers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX1228ACEP+ 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 MAX1226/MAX1228/MAX1230 product line was engineered specifically for embedded data-acquisition systems needing multichannel voltage and temperature measurement with minimal external components and deterministic timing.
FAQ
What is the operating temperature range for the MAX1228ACEP+?
The MAX1228ACEP+ is specified over the extended industrial temperature range of -40°C to +85°C. Its internal temperature sensor maintains ±1.2°C accuracy across this full range, and all DC and dynamic specifications - including ±1 LSB INL/DNL and 73dB SINAD - are guaranteed within these limits. This makes the MAX1228ACEP+ suitable for deployment in harsh environments such as factory floors, outdoor instrumentation, and automotive under-hood monitoring where thermal stability is critical.
Does the MAX1228ACEP+ require an external reference voltage?
No, the MAX1228ACEP+ does not require an external reference voltage because it includes a precision internal 4.096V reference with ±20ppm/°C temperature coefficient and 200µVRMS noise. This reference is used by default for both analog-to-digital conversion and temperature measurement. An external differential reference can be applied via REF+ and REF-/AIN6 pins only if higher accuracy or custom scaling is needed - but doing so disables the internal reference and requires external circuitry.
How many analog input channels does the MAX1228ACEP+ support?
The MAX1228ACEP+ supports 12 single-ended analog input channels (AIN0–AIN11) or 6 true differential input pairs (AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, REF-/AIN6/AIN7, CNVST/AIN7/AIN8, AIN9/AIN10 - per datasheet Table 3 configuration). Channel AIN11 is accessible only when CNVST/AIN7 is not used as a conversion trigger. All channels are software-configurable for unipolar or bipolar operation via the setup register.
What is the purpose of the FIFO in the MAX1228ACEP+?
The 16-entry FIFO in the MAX1228ACEP+ buffers ADC conversion results and temperature measurements, enabling autonomous acquisition sequences without continuous microprocessor polling. When configured for scan mode, it stores up to 16 data words (each 16 bits, MSB-first with 4 leading zeros), allowing burst sampling at up to 300ksps while freeing the SPI bus for other tasks - essential for real-time control loops and deterministic data logging in the MAX1228ACEP+.
Can the MAX1228ACEP+ perform simultaneous sampling of multiple channels?
No, the MAX1228ACEP+ does not support true simultaneous sampling across multiple channels. It uses a single SAR ADC core with an analog multiplexer and shared track-and-hold, meaning channels are sampled sequentially. However, its fast acquisition time (0.6µs typical) and internal FIFO allow tightly spaced sequential sampling - achieving effective "quasi-simultaneous" capture for low-frequency signals (<100kHz bandwidth) when used with appropriate external anti-alias filtering and proper source impedance matching.
MAX1228ACEP+ 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1228ACEP+ FAQ
1.How can I place an order for MAX1228ACEP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1228ACEP+ 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 MAX1228ACEP+ reliable?
The price and inventory of MAX1228ACEP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1228ACEP+ is usually 5 days.
3.What payment methods are accepted for MAX1228ACEP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1228ACEP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1228ACEP+?
MAX1228ACEP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1228ACEP+ 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 MAX1228ACEP+?
For technical support, including MAX1228ACEP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1228ACEP+ requirements.
6.How does Aetrix verify that MAX1228ACEP+ is sourced from the original manufacturer or authorized distributors?
All MAX1228ACEP+ 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 MAX1228ACEP+ meets industry standards.
7.What is the process for return or replacement of MAX1228ACEP+?
All MAX1228ACEP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1228ACEP+, 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 MAX1228ACEP+ part is unused and in its original packaging.
Return procedure for MAX1228ACEP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1228ACEP+ 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…
