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Analog Devices Inc./Maxim Integrated MAX1028ACEP
- Part No.:
- MAX1028ACEP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1028ACEP.pdf
- Description:
- 10-BIT 300KSPS ADCS WITH FIFO
- Quantity:
- Payment:
- Shipping:
Inventory:409
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Product details
Overview
The MAX1028ACEP from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor, internal 4.096V reference, 16-entry FIFO, and configurable 12-channel single-ended or 6-channel true differential input. It operates from a single +5V supply, supports SPI/QSPI/MICROWIRE-compatible 3-wire interface up to 10MHz, and is specified for -40°C to +85°C industrial operation in system supervision and data-acquisition applications.
For engineers reviewing the MAX1028ACEP datasheet, MAX1028ACEP pinout, MAX1028ACEP application, or MAX1028ACEP equivalent, this page delivers verified technical context, real-world design meaning of key specs, package-validated pin functions, confirmed alternative options, and supply-chain support details specific to the MAX1028ACEP QSOP variant.
Technical Context
The MAX1028ACEP implements a fully differential successive-approximation register (SAR) ADC architecture with on-chip track-and-hold, supporting unipolar or bipolar differential inputs and single-ended inputs referenced to GND. Its internal oscillator enables autonomous conversion timing in clock modes 00, 01, and 10, while mode 11 accepts external SCLK up to 4.8MHz for precise 300ksps sampling.
It integrates a calibrated temperature sensor (±1.2°C over temperature), 16-deep FIFO for burst acquisition without bus contention, and programmable scan/averaging logic. All analog inputs are protected by ESD diodes clamping to VDD/GND, with absolute input voltage range of –0.3V to VDD+0.3V and full-scale accuracy maintained within GND–50mV to VDD+50mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete output codes with no missing codes guaranteed over temperature. |
| Sampling Rate | 300ksps max - supports high-speed transient capture when externally clocked at ≤4.8MHz SCLK. |
| INL / DNL | ±1 LSB - ensures monotonicity and <0.1% full-scale linearity error across operating range. |
| Internal Reference | 4.096V ±72mV (±20ppm/°C TC) - provides stable scaling without external components; required for temperature sensing. |
| Temperature Accuracy | ±1.2°C (Grade B, –40°C to +85°C) - enables direct board-level thermal monitoring without calibration. |
| Supply Current | 2.3mA at 300ksps - enables low-power operation in battery-backed or energy-constrained systems. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE - compatible with standard microcontroller peripherals; supports CPOL/CPHA = 0 or 1. |
Pinout & Package
The MAX1028ACEP is packaged in a 20-pin QSOP (5.3mm × 10.2mm) with gull-wing leads, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–10 | AIN0–AIN9 | Configurable analog inputs; support single-ended or true differential pairs (e.g., AIN0/AIN1); 12 total channels available (AIN0–AIN11). |
| 11 | REF-/AIN10 | Negative reference input for external differential reference; doubles as analog input AIN10 when REF- not used. |
| 12 | CNVST/AIN11 | Active-low conversion start trigger; doubles as analog input AIN11 when CNVST function disabled via setup register. |
| 13 | REF+ | Positive reference input; requires 0.1µF bypass capacitor to GND for noise immunity and stability. |
| 14 | GND | Analog/digital ground reference; must be connected to system ground plane with low-inductance path. |
| 15 | VDD | +5V power supply; requires local 0.1µF ceramic bypass capacitor to minimize supply ripple. |
| 16 | SCLK | Serial clock input; accepts 40–60% duty cycle; clocks data on rising edge (DIN) and falling edge (DOUT). |
| 17 | CS | Active-low chip select; enables serial interface and places DOUT in high-impedance state when high. |
| 18 | DIN | Serial data input; latched on rising SCLK edge; carries register writes (setup, conversion, averaging). |
| 19 | DOUT | Serial data output; drives MSB-first 16-bit result (4 leading zeros + 10-bit code + 2 sub-bits) on falling SCLK edge. |
| 20 | EOC | End-of-conversion open-drain output; pulls low after conversion completion; used for interrupt-driven readout. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip FIFO buffer | 16-entry depth stores ADC results plus one temperature reading - eliminates serial bus blocking during multi-channel scans. |
| True differential T/H architecture | Supports simultaneous sampling of IN+/IN– pairs (e.g., AIN0/AIN1) - rejects common-mode noise and DC offsets in noisy industrial environments. |
| Programmable clock modes | Four modes (00–11) enable flexible timing control - allows autonomous scanning (mode 00), event-triggered conversion (mode 01), or external SCLK synchronization (mode 11). |
| Internal temperature sensor | ±1.2°C accuracy over –40°C to +85°C - provides direct thermal feedback for fan control, overtemperature shutdown, or calibration compensation. |
| AutoShutdown™ | Reduces supply current to <5µA in shutdown - extends battery life in portable instrumentation and remote sensors. |
Applications
| System Supervision | Data-Acquisition Systems |
|---|---|
Use Scenario: Monitoring rail voltages, CPU core temperature, and fan tachometer signals in embedded controllers. IC Role / Device Role / Timing Role: Simultaneous 12-channel voltage and temperature digitization with FIFO buffering for non-blocking host reads. Use Value: Enables real-time health diagnostics without dedicated microcontroller cycles or external multiplexing hardware. | Use Scenario: Capturing sensor outputs (pressure, humidity, strain) in environmental logging nodes with limited MCU resources. IC Role / Device Role / Timing Role: Autonomous scan-mode ADC with internal clock and averaging - reduces firmware overhead and improves SNR via oversampling. Use Value: Delivers 61dB SINAD and 89dB SFDR at 30kHz input, meeting Class I data logger accuracy requirements. |
| Industrial Control Systems | Patient Monitoring |
Use Scenario: Reading analog outputs from PLC I/O modules, thermocouple conditioners, and position encoders in factory automation. IC Role / Device Role / Timing Role: True differential input stage rejecting 50/60Hz mains noise; bipolar mode supports ±2.048V transducer signals. Use Value: Eliminates need for external instrumentation amplifiers or anti-alias filters in moderate-bandwidth (<100kHz) control loops. | Use Scenario: Digitizing ECG, SpO₂, and respiration sensor signals in portable medical devices requiring low power and small footprint. IC Role / Device Role / Timing Role: Single +5V supply operation with 2.3mA active current and AutoShutdown™ - extends battery runtime between charges. Use Value: Integrates reference, temperature sensor, and FIFO in one 20-pin QSOP - reduces BOM count and PCB area vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200ksps max, no internal reference or temperature sensor, 8-channel single-ended only. | Lacks FIFO, differential input, and on-chip temp sensing - suitable only for basic voltage monitoring where 10-bit precision is unnecessary. | Select only if cost sensitivity outweighs resolution, channel count, and feature requirements. |
| MAX11126ETE+ | 12-bit resolution, 500ksps, internal reference, but no temperature sensor or FIFO; uses 16-pin TQFN. | Higher resolution and speed, but requires external temperature sensing and lacks burst acquisition capability. | Prefer when SNR >70dB and sampling rate >300ksps are critical, and thermal monitoring is handled separately. |
Compared with the MAX1028ACEP, the ADS7822U trades resolution and features for lower cost and power, while the MAX11126ETE+ upgrades resolution and speed but removes integrated thermal sensing and FIFO-based autonomous acquisition - making the MAX1028ACEP uniquely balanced for compact, self-contained industrial and medical data loggers.
Availability
MAX1028ACEP is available at Aetrix Electronics and suitable for system supervision, data-acquisition systems, and industrial control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1028ACEP 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.
The MAX1028ACEP belongs to the MAX1026/MAX1028/MAX1030 family of low-power, multichannel ADCs with integrated temperature sensing - engineered for space-constrained, single-supply systems needing autonomous analog monitoring without external references or support components.
FAQ
What is the maximum sampling rate supported by the MAX1028ACEP?
The MAX1028ACEP achieves a maximum sampling rate of 300ksps when using an external clock signal applied to the SCLK pin in clock mode 11. This requires SCLK frequency ≤4.8MHz with 40–60% duty cycle. Internally clocked modes support lower rates (e.g., ~270ksps typical), and the device guarantees no missing codes and ±1 LSB INL/DNL performance at full speed.
Does the MAX1028ACEP require an external reference voltage?
No, the MAX1028ACEP includes a factory-trimmed internal 4.096V reference with ±20ppm/°C temperature coefficient, sufficient for most precision applications. An external differential reference can be applied between REF+ and REF– pins if higher accuracy or custom scaling is needed, but the internal reference is mandatory for temperature measurements.
How many analog input channels does the MAX1028ACEP support?
The MAX1028ACEP supports 12 single-ended analog input channels (AIN0–AIN11) or 6 true differential input pairs (e.g., AIN0/AIN1, AIN2/AIN3, etc.). Channel configuration is controlled via the setup and conversion registers; pins AIN10 and AIN11 double as REF– and CNVST respectively when not used as analog inputs.
What is the purpose of the FIFO in the MAX1028ACEP?
The 16-entry FIFO in the MAX1028ACEP buffers ADC conversion results and temperature readings, allowing up to 16 sequential conversions to complete autonomously without host intervention. This enables burst acquisition, reduces serial bus contention, and simplifies firmware by decoupling conversion timing from data readout - especially valuable in scan mode or when averaging multiple samples per channel.
Is the MAX1028ACEP pin-compatible with other devices in the MAX1026/MAX1028/MAX1030 family?
Yes, the MAX1028ACEP shares identical pinout and package (20-pin QSOP) with the MAX1026 and MAX1030 variants in QSOP format. However, channel count differs: MAX1026 offers 8 single-ended/4 differential channels, MAX1028 offers 12/6, and MAX1030 offers 16/8. Register compatibility is maintained across the family, enabling firmware reuse with minor channel-mapping adjustments.
MAX1028ACEP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 6, 12
- Input Type:
- Differential, Single Ended
- Data Interface:
- 3-Wire, 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:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- Internal Oscillator, Temperature Sensor
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1028ACEP FAQ
1.How can I place an order for MAX1028ACEP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1028ACEP 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 MAX1028ACEP reliable?
The price and inventory of MAX1028ACEP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1028ACEP is usually 5 days.
3.What payment methods are accepted for MAX1028ACEP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1028ACEP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1028ACEP?
MAX1028ACEP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1028ACEP 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 MAX1028ACEP?
For technical support, including MAX1028ACEP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1028ACEP requirements.
6.How does Aetrix verify that MAX1028ACEP is sourced from the original manufacturer or authorized distributors?
All MAX1028ACEP 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 MAX1028ACEP meets industry standards.
7.What is the process for return or replacement of MAX1028ACEP?
All MAX1028ACEP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1028ACEP, 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 MAX1028ACEP part is unused and in its original packaging.
Return procedure for MAX1028ACEP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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