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Analog Devices Inc./Maxim Integrated MAX1028BEEP+T
- Part No.:
- MAX1028BEEP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1028BEEP+T.pdf
- Description:
- IC ADC 10BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,803
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Product details
Overview
MAX1028BEEP+T from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±1.2°C error over –40°C to +85°C), 12-channel analog multiplexer (configurable single-ended or true differential), and on-chip 16-entry FIFO. It operates from a single +5V supply, features internal 4.096V reference, and supports SPI/QSPI/MICROWIRE-compatible 3-wire interface - used in industrial data acquisition and system supervision where multichannel voltage and temperature monitoring are required.
For engineers reviewing the MAX1028BEEP+T datasheet, MAX1028BEEP+T pinout, MAX1028BEEP+T application, or MAX1028BEEP+T equivalent, this page delivers verified specifications, package-validated pin functions, real-world use scenarios for embedded monitoring, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX1028BEEP+T implements a fully differential successive-approximation register (SAR) ADC architecture with integrated track-and-hold, supporting both unipolar (0 to VREF) and bipolar (±VREF/2) differential input ranges. Its internal oscillator enables autonomous scan mode operation without external clock dependency in CKSEL = 00/01/10 modes.
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 conversion results and temperature readings independently, enabling burst acquisition without serial bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete output codes with no missing codes over temperature. |
| Sampling Rate | 300ksps max with external clock - supports high-speed transient capture in process control loops. |
| INL / DNL | ±1 LSB INL and ±1 LSB DNL - ensures monotonicity and linearity critical for closed-loop feedback systems. |
| Input Channels | 12 single-ended or 6 true differential channels - enables simultaneous monitoring of multiple sensors or differential transducer outputs. |
| Temperature Accuracy | ±1.2°C over –40°C to +85°C - provides reliable board-level thermal management without external calibration. |
| Reference | Internal 4.096V ±20ppm/°C - eliminates need for external precision reference in space-constrained designs. |
| Supply Current | 2.3mA at 300ksps - enables low-power operation in battery-backed or energy-sensitive instrumentation. |
Pinout & Package
MAX1028BEEP+T is housed in a 20-pin QSOP (0.150" wide) package with lead(Pb)-free/RoHS-compliant finish. Pin spacing is 0.025", body dimensions are 7.4mm × 5.0mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN9 | Analog Input Channels | 10 dedicated single-ended inputs; configurable as 5 true differential pairs (e.g., AIN0/AIN1) in bipolar mode. |
| REF-/AIN10 | Negative Reference / Analog Input | Shared terminal: when configured as REF-, disables AIN10; when configured as AIN10, enables 11th single-ended channel. |
| CNVST/AIN11 | Active-Low Conversion Start / Analog Input | Hardware-triggered conversion start signal; if not used for triggering, functions as 12th single-ended input. |
| REF+ | Positive Reference Input | Accepts internal 4.096V reference or external differential reference; requires 0.1µF bypass to GND. |
| GND | Ground Reference | Analog and digital ground common pin - must be connected to low-impedance system ground plane. |
| VDD | +5V Power Supply | Single 4.75V–5.25V supply; requires local 0.1µF ceramic decoupling capacitor. |
| SCLK | Serial Clock Input | Supports up to 10MHz clock; 40–60% duty cycle required; controls timing of DIN latching and DOUT output. |
| CS | Active-Low Chip Select | Enables serial interface when low; places DOUT in high-impedance state when high. |
| DIN | Serial Data Input | Accepts 8-bit command bytes (MSB first) to configure setup, conversion, averaging, and unipolar/bipolar registers. |
| DOUT | Serial Data Output | Outputs 16-bit result (MSB first) on falling SCLK edge; holds oldest FIFO entry until read. |
| EOC | End-of-Conversion Output | Active-low open-drain signal indicating valid data ready; asserted after each conversion in clock mode 01. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers up to 16 ADC results plus one temperature reading - decouples acquisition from host processor timing. |
| True differential track-and-hold | Rejects common-mode noise on matched input pairs (e.g., AIN0/AIN1) - essential for precision transducer interfaces. |
| Internal temperature sensor | ±1.2°C accuracy over full –40°C to +85°C range - enables self-monitoring without external thermistor or IC. |
| Scan mode with internal averaging | Automatically sequences through selected channels and averages up to 4 samples per result - reduces noise without firmware overhead. |
| 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 monitoring of pressure, flow, and temperature signals from multiple sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: Multichannel voltage digitizer with integrated temperature sensing - performs synchronized sampling across 12 analog inputs while concurrently measuring ambient PCB temperature. Use Value: Eliminates need for separate temperature sensor and external reference, reducing BOM count and layout area by 3 components per node. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals and sensor temperatures in battery-powered clinical devices. IC Role / Device Role / Timing Role: Low-power ADC with hardware-triggered conversion (CNVST) - enables precise timing alignment between analog front-end and digital processing stages. Use Value: 2.3mA active current and AutoShutdown™ extend runtime to >72 hours on a single CR2032 cell during intermittent measurement cycles. |
| Data Logging for Environmental Sensors | Embedded System Supervision |
Use Scenario: Remote weather station logging temperature, humidity (via voltage output), and barometric pressure over extended periods. IC Role / Device Role / Timing Role: FIFO-buffered ADC with internal clock mode - autonomously acquires and stores 16-channel samples before host MCU initiates bulk readout. Use Value: Reduces host wake-up frequency by 16× compared to polled acquisition, cutting system-level power consumption by >40%. |
Use Scenario: Real-time monitoring of CPU core voltage, VRM output, and heatsink temperature in network switch firmware. IC Role / Device Role / Timing Role: System health monitor with dual reference support - uses internal 4.096V reference for temperature and external reference for high-accuracy rail measurements. Use Value: Enables ±0.5% rail voltage accuracy and ±1.2°C thermal margin detection within same IC - simplifies fault-detection logic in safety-critical firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit, 200ksps, no internal reference or temperature sensor, 8-channel single-ended only | Lacks FIFO, differential input, and on-chip temp sensing - requires external reference and thermal monitoring circuitry | Select when cost sensitivity outweighs resolution, channel count, and integration needs; verify SNR (60dB vs. MAX1028's 61dB SINAD) meets signal fidelity requirements. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, no internal temp sensor, external reference only, SPI-only interface | Higher resolution and speed but no integrated temperature sensing or internal reference - increases external component count | Choose for higher-precision voltage measurement where thermal monitoring is handled separately; confirm 3.3V-only supply compatibility versus MAX1028's +5V operation. |
Compared with ADS7822U and AD7490BRUZ, MAX1028BEEP+T uniquely combines 10-bit resolution, 12-channel flexibility, integrated temperature sensing, and internal reference in a single +5V 20-pin QSOP - reducing total solution size and validation effort for compact industrial and medical monitoring systems.
Availability
MAX1028BEEP+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable patient vital sign acquisition, and embedded system supervision requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1028BEEP+T 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, with emphasis on integration, low power, and reliability.
MAX1028BEEP+T belongs to the MAX1026/MAX1028/MAX1030 family of multichannel ADCs engineered for embedded system supervision and data acquisition where simultaneous voltage and temperature measurement, FIFO buffering, and minimal external components are critical design goals.
FAQ
What is the operating temperature range for MAX1028BEEP+T?
The MAX1028BEEP+T is specified for operation from –40°C to +85°C, matching its "E" grade designation in the ordering code. This extended industrial temperature range ensures reliable performance in harsh environments such as factory automation controllers and outdoor environmental sensors. All key specifications-including INL, DNL, temperature sensor accuracy (±1.2°C), and supply current-are guaranteed across this full range.
Does MAX1028BEEP+T require an external reference voltage?
No, MAX1028BEEP+T includes a factory-trimmed internal 4.096V reference with ±20ppm/°C temperature coefficient, eliminating the need for an external reference in most applications. An external differential reference can be applied via REF+ and REF– pins if higher initial accuracy or custom scaling is required, but the internal reference remains active for temperature measurements regardless of REFSEL configuration.
How many analog input channels does MAX1028BEEP+T support?
MAX1028BEEP+T supports 12 single-ended analog inputs (AIN0–AIN9, REF-/AIN10, CNVST/AIN11) or 6 true differential input pairs (e.g., AIN0/AIN1, AIN2/AIN3). Channel configuration is controlled via the setup and unipolar/bipolar registers - all 12 channels are accessible in single-ended mode, while differential pairing is limited to predefined adjacent pairs per the device's analog mux architecture.
Can MAX1028BEEP+T perform simultaneous sampling across multiple channels?
No, MAX1028BEEP+T uses a single SAR ADC core with a multiplexer, so it performs sequential sampling-not true simultaneous sampling. However, its fast 300ksps rate and 16-entry FIFO enable rapid scanning of all 12 channels with minimal inter-channel timing skew (<1.4μs acquisition time), making it suitable for quasi-simultaneous acquisition in vibration analysis or multi-sensor monitoring where absolute simultaneity is not required.
What is the function of the EOC pin on MAX1028BEEP+T?
The EOC (End of Conversion) pin on MAX1028BEEP+T is an active-low, open-drain output that signals when conversion data is ready for readout. In clock mode 01 (CNVST-triggered), EOC pulses low after each individual conversion. In clock modes 00 and 10, it asserts low after the last requested conversion in a scan sequence. EOC returns high when CS or CNVST transitions low, providing hardware handshaking independent of software polling.
MAX1028BEEP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1028BEEP+T FAQ
1.How can I place an order for MAX1028BEEP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1028BEEP+T 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 MAX1028BEEP+T reliable?
The price and inventory of MAX1028BEEP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1028BEEP+T is usually 5 days.
3.What payment methods are accepted for MAX1028BEEP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1028BEEP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1028BEEP+T?
MAX1028BEEP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1028BEEP+T 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 MAX1028BEEP+T?
For technical support, including MAX1028BEEP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1028BEEP+T requirements.
6.How does Aetrix verify that MAX1028BEEP+T is sourced from the original manufacturer or authorized distributors?
All MAX1028BEEP+T 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 MAX1028BEEP+T meets industry standards.
7.What is the process for return or replacement of MAX1028BEEP+T?
All MAX1028BEEP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1028BEEP+T, 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 MAX1028BEEP+T part is unused and in its original packaging.
Return procedure for MAX1028BEEP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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