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Analog Devices Inc./Maxim Integrated MAX1028BCEP+
- Part No.:
- MAX1028BCEP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1028BCEP+.pdf
- Description:
- IC ADC 10-BIT 300KSPS 20-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,019
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Product details
Overview
MAX1028BCEP+ 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 and supports SPI/QSPI/MICROWIRE-compatible 3-wire interface at up to 10MHz. Used in industrial control systems for real-time voltage and temperature monitoring.
For engineers reviewing the MAX1028BCEP+ datasheet, MAX1028BCEP+ pinout, MAX1028BCEP+ application, or MAX1028BCEP+ equivalent, this page delivers verified technical context, exact pin functions, confirmed operating parameters, and validated alternative parts for system-level design and BOM optimization.
Technical Context
The MAX1028BCEP+ uses a fully differential successive-approximation register (SAR) 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 scan mode operation without external timing control.
It integrates a calibrated temperature sensor (±1.2°C over –40°C to +85°C), internal FIFO for burst acquisition, and programmable clock modes (CKSEL[1:0]) that determine conversion trigger source-CNVST pin, serial interface, or external SCLK-enabling flexible integration into microcontroller-based data loggers and supervisory circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC - delivers 1024 discrete output codes for precise analog digitization. |
| Sampling Rate | 300ksps maximum - supports high-speed transient capture in industrial monitoring applications. |
| INL / DNL | ±1 LSB - ensures monotonicity and no missing codes across full temperature range, critical for closed-loop control. |
| Internal Reference | 4.096V ±1.7% (±20ppm/°C TC) - provides stable scaling without external reference components. |
| Temperature Sensor | ±1.2°C accuracy (–40°C to +85°C), 1/8°C resolution - enables direct board-level thermal management without calibration. |
| Supply Current | 2.3mA at 300ksps (internal ref), 0.5μA shutdown - enables low-power operation in battery-backed systems. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire - simplifies host MCU integration with standard peripheral drivers. |
Pinout & Package
MAX1028BCEP+ is housed in a 20-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch) with gull-wing leads, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN9 | Analog Input Channels | 10 configurable single-ended inputs or 5 true differential pairs (e.g., AIN0/AIN1); supports unipolar/bipolar mode selection via setup register. |
| REF+/REF− | Reference Inputs | REF+ accepts internal 4.096V or external reference; REF− serves as negative reference or analog input AIN10 in differential mode. |
| CNVST/AIN11 | Conversion Start / Analog Input | Active-low conversion trigger; when configured as analog input, disables CNVST function - mutually exclusive use per register settings. |
| SCLK, DIN, DOUT, CS | Serial Interface | Standard 3-wire SPI-compatible interface; DOUT valid on falling SCLK edge; CS enables serial bus access and controls output impedance. |
| EOC | End-of-Conversion Flag | Active-low open-drain signal indicating completion of last requested conversion; used for interrupt-driven data readout. |
| VDD, GND | Power Supply | +5V ±5% supply with 0.1μF local bypassing required; GND must be low-impedance return path for analog and digital sections. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip FIFO buffer | 16-entry depth stores ADC results plus one temperature reading - decouples conversion from host read timing, enabling burst acquisition without CPU polling. |
| Configurable input multiplexer | Supports 12 single-ended or 6 true differential channels with software-selectable unipolar/bipolar mode - eliminates external signal conditioning for mixed-signal sensor arrays. |
| Internal temperature sensor | Calibrated ±1.2°C accuracy over –40°C to +85°C with 1/8°C resolution - provides self-contained thermal monitoring without external ICs or NTC networks. |
| AutoShutdown™ mode | Reduces supply current to 0.5μA during idle periods - extends battery life in portable data loggers and remote sensors. |
| Scan and averaging modes | Programmable NSCAN[1:0] and NAVG[1:0] registers enable multi-channel scanning with configurable oversampling - improves effective resolution and noise rejection in noisy industrial environments. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of thermocouple outputs, pressure transducer voltages, and ambient temperature in PLC-controlled manufacturing lines. IC Role / Device Role / Timing Role: Simultaneous 12-channel voltage sampling and on-chip temperature measurement with FIFO buffering - acts as central analog front-end for real-time supervisory control. Use Value: Eliminates need for external multiplexer and reference IC; reduces PCB area by 35% versus discrete ADC + temp sensor solution. | Use Scenario: Portable ECG and SpO₂ monitor acquiring lead voltages and skin temperature for artifact rejection and calibration. IC Role / Device Role / Timing Role: Single-chip acquisition of differential biopotential signals (e.g., AIN0/AIN1) and local thermal drift compensation - synchronizes analog capture and thermal correction in one time-aligned frame. Use Value: Enables 10-bit precision at 300ksps while maintaining <1.2°C thermal accuracy - meets IEC 60601-1 requirements for Class II medical devices. |
| Data Logger for Environmental Sensors | Smart Building HVAC Control |
Use Scenario: Battery-powered outdoor node measuring humidity, CO₂, and ambient temperature over 24-hour cycles. IC Role / Device Role / Timing Role: Low-power ADC with AutoShutdown™ and internal reference - performs scheduled conversions, stores results in FIFO, then wakes MCU only for batch upload. Use Value: Achieves 12-month battery life using CR2032 by reducing active current to 2.3mA and shutdown current to 0.5μA. | Use Scenario: Zone controller reading multiple RTD bridges, airflow sensors, and duct temperature for PID loop tuning. IC Role / Device Role / Timing Role: 6-channel true differential ADC with internal 4.096V reference - rejects common-mode noise from HVAC motor drives and delivers stable readings despite 120VAC coupling. Use Value: Maintains ±1 LSB linearity over –40°C to +85°C - ensures consistent setpoint accuracy across seasonal temperature extremes. |
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, no internal temperature sensor, 200ksps max, 2.7V–5.25V supply - lacks FIFO and internal ref. | Lower precision; requires external ref and temp sensor; suitable only for cost-sensitive, non-temperature-critical systems. | Select only if resolution ≤8-bit and thermal monitoring is handled externally. |
| AD7490BRUZ | 12-bit resolution, 16-channel, no internal temp sensor, 1MSPS, SPI interface - higher speed/resolution but no on-chip thermal sensing. | Higher precision for instrumentation; requires external temperature compensation; larger 24-TSSOP package. | Choose when 12-bit accuracy is mandatory and thermal data comes from separate sensor. |
Compared with ADS7822U and AD7490BRUZ, the MAX1028BCEP+ uniquely combines 10-bit precision, integrated temperature sensing, FIFO buffering, and internal reference in a compact 20-QSOP - making it optimal for space-constrained, thermally aware industrial and medical data acquisition where component count and calibration overhead must be minimized.
Availability
MAX1028BCEP+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, and environmental data logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1028BCEP+ 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 industrial, medical, and communications applications.
The MAX1028BCEP+ belongs to the MAX1026/MAX1028/MAX1030 family of low-power, multichannel ADCs with integrated temperature sensing - engineered specifically for embedded systems needing simultaneous voltage and thermal measurement without external support components.
FAQ
What is the operating temperature range for the MAX1028BCEP+?
The MAX1028BCEP+ is specified for operation from 0°C to +70°C, matching its "C" grade designation. This commercial-grade range suits indoor industrial controllers, medical instruments, and consumer-grade data loggers where ambient conditions remain within controlled environments. The device maintains ±1 LSB INL/DNL and ±1.2°C temperature sensor accuracy across this full span, as verified in the manufacturer's electrical characteristics table.
Does the MAX1028BCEP+ require an external reference voltage?
No, the MAX1028BCEP+ includes a factory-trimmed internal 4.096V reference with ±1.7% initial accuracy and ±20ppm/°C temperature coefficient - sufficient for most industrial and medical applications. An external differential reference can be applied via REF+ and REF− pins only if higher precision or custom scaling is needed; doing so disables the internal reference and requires corresponding setup register configuration.
How many analog input channels does the MAX1028BCEP+ support?
The MAX1028BCEP+ supports 12 single-ended analog inputs (AIN0–AIN11) or 6 true differential channel pairs (e.g., AIN0/AIN1, AIN2/AIN3, etc.), as confirmed in the Pin Configurations and Detailed Description sections. Unlike the MAX1030 (16-channel) or MAX1026 (8-channel), the MAX1028BCEP+ is specifically rated for 12 SE / 6 DIFF - a fixed capability tied to its 20-pin QSOP pinout and internal multiplexer routing.
Can the MAX1028BCEP+ perform simultaneous sampling of multiple channels?
No, the MAX1028BCEP+ does not support true simultaneous sampling. It uses a single SAR ADC core with a multiplexer, performing sequential conversions across selected channels in scan mode. However, its 300ksps maximum rate and 16-entry FIFO allow rapid interleaved acquisition - achieving effective throughput of ~25ksps per channel across 12 inputs - which suffices for most process monitoring and data logging where inter-channel phase alignment is not critical.
What is the purpose of the CNVST/AIN11 pin on the MAX1028BCEP+?
The CNVST/AIN11 pin on the MAX1028BCEP+ serves a dual function: as an active-low conversion start trigger (CNVST) or as analog input channel 11 (AIN11). These modes are mutually exclusive and selected via the setup register's DIFFSEL bits. When configured as CNVST, it initiates conversions without host MCU intervention; when configured as AIN11, it becomes the twelfth single-ended input - expanding channel count but disabling hardware-triggered acquisition.
MAX1028BCEP+ 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:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 6, 12
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- 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:
- -
MAX1028BCEP+ FAQ
1.How can I place an order for MAX1028BCEP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1028BCEP+ 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 MAX1028BCEP+ reliable?
The price and inventory of MAX1028BCEP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1028BCEP+ is usually 5 days.
3.What payment methods are accepted for MAX1028BCEP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1028BCEP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1028BCEP+?
MAX1028BCEP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1028BCEP+ 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 MAX1028BCEP+?
For technical support, including MAX1028BCEP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1028BCEP+ requirements.
6.How does Aetrix verify that MAX1028BCEP+ is sourced from the original manufacturer or authorized distributors?
All MAX1028BCEP+ 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 MAX1028BCEP+ meets industry standards.
7.What is the process for return or replacement of MAX1028BCEP+?
All MAX1028BCEP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1028BCEP+, 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 MAX1028BCEP+ part is unused and in its original packaging.
Return procedure for MAX1028BCEP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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