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Analog Devices Inc./Maxim Integrated MAX1284BESA+T
- Part No.:
- MAX1284BESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1284BESA+T.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,009
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Product details
Overview
MAX1284BESA+T from Maxim Integrated is a 12-bit, single-supply serial analog-to-digital converter (ADC) with internal +2.5V reference, 400ksps sampling rate, ±1LSB INL/DNL accuracy, and SPI/QSPI/MICROWIRE 3-wire interface - designed for precision data acquisition in space-constrained, low-power systems such as portable medical instruments and remote sensor nodes.
For engineers reviewing the MAX1284BESA+T datasheet, MAX1284BESA+T pinout, MAX1284BESA+T application, or MAX1284BESA+T equivalent, this page delivers verified electrical specs, thermal operating range (-40°C to +85°C), SO-8 package mapping, real-world timing constraints (tCONV = 2.5µs, tACQ = 468ns), and validated alternative options for industrial and battery-powered designs.
Technical Context
The MAX1284BESA+T implements a successive-approximation register (SAR) architecture with integrated track/hold and trimmed internal 2.5V reference, enabling unipolar 0–2.5V analog input conversion without external components. Its serial interface operates at up to 6.4MHz SCLK with strict timing requirements including tDOV = 80ns and tCSS = 35ns.
It supports two operational modes: normal (2.5mA IDD at 400ksps) and shutdown (2µA ISHDN), with wake-up delay dependent on 4.7µF REF bypass capacitor discharge history. Input protection diodes allow AIN swing from (GND − 0.3V) to (VDD + 0.3V), and full-power bandwidth is 6MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 400ksps - enables real-time capture of signals up to 200kHz Nyquist bandwidth; requires ≥6.4MHz SCLK for full throughput. |
| DC Accuracy | ±1LSB INL and ±1LSB DNL - ensures linearity error ≤0.024% FS and guarantees monotonicity across full operating range. |
| Reference Voltage | +2.50V ±20mV (2.48V–2.52V) - factory-trimmed internal reference eliminates need for external voltage reference IC or resistor divider. |
| Supply Range | +4.5V to +5.5V - compatible with standard 5V logic rails and industrial power supplies; absolute max VDD = +6V. |
| Power Consumption | 2.5mA at 400ksps - enables <13mW active power draw at +5V; drops to 2µA in shutdown mode for ultra-low standby current. |
| Operating Temperature | -40°C to +85°C - qualified for extended industrial environments; specified performance maintained across full range. |
Pinout & Package
MAX1284BESA+T is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0mm × 4.0mm, 1.27mm pitch). Pin 1 is marked with a dot or beveled corner; device is RoHS-compliant and lead(Pb)-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +4.5V to +5.5V; must be bypassed with 0.1µF and 10µF capacitors to analog ground for noise immunity. |
| 2 AIN | Analog input | Unipolar 0–2.5V input referenced to internal VREF; protected by clamping diodes to VDD/GND; 18pF input capacitance. |
| 3 SHDN | Active-low shutdown control | Pulling low reduces supply current to 2µA; wake-up time depends on REF capacitor charge state (up to 2ms). |
| 4 REF | Internal reference output | Provides stable +2.5V output; requires 4.7µF tantalum or ceramic bypass capacitor; sources ≤800µA. |
| 5 GND | Analog and digital ground | Single-point star ground connection required; separates analog signal path from digital switching noise. |
| 6 DOUT | Serial data output | Three-state CMOS output; MSB-first unipolar format with three leading zeros; transitions 20ns after SCLK rising edge. |
| 7 CS | Active-low chip select | Falling edge initiates conversion and enables DOUT; high impedance when deasserted; minimum pulse width = 100ns. |
| 8 SCLK | Serial clock input | Drives conversion and data shift-out; accepts 0.5–6.4MHz square wave; 50% duty cycle recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Internal +2.5V reference | Eliminates external reference IC and calibration overhead; ±15ppm/°C tempco ensures stability across -40°C to +85°C. |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to microcontrollers without level shifters or glue logic; supports CPOL=0/CPHA=0 (SPI) and CPOL=0/CPHA=1 (QSPI). |
| Track/hold with 468ns acquisition | Enables accurate sampling of fast transients; supports source impedances ≤2kΩ without external RC filtering. |
| Low-power shutdown mode | Reduces IDD to 2µA typical; ideal for duty-cycled sensor systems where ADC is active only during measurement windows. |
| 8-pin SO package | Minimizes PCB area and assembly cost; compatible with automated pick-and-place and reflow processes. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 100Hz intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from precision sensors; synchronized via microcontroller's SPI master clock. Use Value: Internal 2.5V reference and 400ksps rate support oversampling for noise reduction; 2.5mA active current extends battery life beyond 1 year on two AA cells. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with 12-bit resolution and clinical-grade linearity. IC Role / Device Role / Timing Role: Front-end ADC converting amplified biopotential signals; operates in continuous conversion mode with microcontroller-controlled CS strobing. Use Value: ±1LSB INL/DNL meets IEC 60601-2-27 linearity requirements; 6MHz full-power bandwidth captures QRS complex fidelity without aliasing. |
| Battery-Powered Instruments | Process Control Sensors |
Use Scenario: Field-deployable pH/ORP meter using electrochemical probes requiring stable reference and low-drift conversion. IC Role / Device Role / Timing Role: Precision ADC interfacing to rail-to-rail op-amp buffer; REF pin supplies reference to signal conditioning stage. Use Value: Internal reference tempco (±15ppm/°C) limits drift to <0.04% FS over operating range; shutdown mode cuts quiescent current to µA-level between readings. |
Use Scenario: Industrial 4–20mA loop-powered transmitter measuring thermocouple or RTD outputs in factory automation. IC Role / Device Role / Timing Role: Isolated ADC digitizing conditioned analog inputs; communicates via opto-isolated SPI to host PLC controller. Use Value: SO-8 package fits compact isolation barrier layouts; 4.5–5.5V supply matches loop-powered auxiliary rails; robust ESD tolerance per HBM spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply; 200ksps; external reference required; no internal T/H; 8-pin SO. | Lacks internal reference and track/hold - requires external REF and signal conditioning circuitry. | Select when system already provides high-accuracy external reference and lower sampling rate suffices. |
| MAX11131AUT+T | 12-bit; 500ksps; +2.7V to +3.6V supply only; internal 2.048V ref; 6-pin SOT23 package. | Lower supply range and smaller package - unsuitable for 5V systems or thermal cycling above +85°C. | Choose for ultra-compact, single-cell battery designs where 2.048V reference aligns with system scaling. |
Compared with ADS7822U and MAX11131AUT+T, the MAX1284BESA+T uniquely combines 5V operation, integrated 2.5V reference, 400ksps speed, and industrial temperature range in an 8-pin SO package - making it optimal for retrofitting legacy 5V data loggers and medical devices requiring minimal BOM changes.
Availability
MAX1284BESA+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered industrial sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1284BESA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX1284BESA+T belongs to Maxim's precision data acquisition product line, engineered for low-power, high-accuracy ADC applications where board space, power budget, and reference stability are critical constraints.
FAQ
What is the maximum sampling rate supported by the MAX1284BESA+T?
The MAX1284BESA+T supports a maximum sampling rate of 400ksps under specified conditions: VDD = +4.5V to +5.5V, fSCLK = 6.4MHz, and 16 clock cycles per conversion. This rate is achieved with 2.5µs conversion time and requires precise timing adherence to tCSS = 35ns and tDOV = 80ns. The MAX1284BESA+T cannot sustain higher rates without violating AC specifications.
Does the MAX1284BESA+T require an external reference voltage?
No, the MAX1284BESA+T does not require an external reference voltage. It integrates a factory-trimmed +2.50V ±20mV internal reference connected to the REF pin. This reference drives both the ADC core and can be used externally - but requires a 4.7µF bypass capacitor for stability. Using an external reference disables the internal one.
Can the MAX1284BESA+T operate from a 3.3V supply?
No, the MAX1284BESA+T is specified only for +4.5V to +5.5V operation. Attempting to power it from 3.3V violates its Absolute Maximum Ratings and will result in undefined behavior or failure. For 3.3V systems, consider the pin-compatible MAX1285BESA+T variant, which operates from +2.7V to +3.6V.
What is the purpose of the SHDN pin on the MAX1284BESA+T?
The SHDN pin on the MAX1284BESA+T is an active-low shutdown control that reduces supply current from 2.5mA (active) to 2µA (typical) when pulled low. It disables the internal reference and track/hold circuitry. Wake-up time depends on the charge state of the 4.7µF REF bypass capacitor and may take up to 2ms before valid conversions resume.
Is the MAX1284BESA+T pin-compatible with the MAX1240 series?
Yes, the MAX1284BESA+T is explicitly documented as a pin-compatible, higher-speed upgrade to the MAX1240/MAX1241. Both share identical 8-pin SO packaging, pin functions (VDD, AIN, SHDN, REF, GND, DOUT, CS, SCLK), and logic-level compatibility - enabling drop-in replacement in existing designs where increased sampling rate (400ksps vs. 133ksps) and improved DC accuracy are needed.
MAX1284BESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 1
- Input Type:
- 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:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1284BESA+T FAQ
1.How can I place an order for MAX1284BESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1284BESA+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 MAX1284BESA+T reliable?
The price and inventory of MAX1284BESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1284BESA+T is usually 5 days.
3.What payment methods are accepted for MAX1284BESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1284BESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1284BESA+T?
MAX1284BESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1284BESA+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 MAX1284BESA+T?
For technical support, including MAX1284BESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1284BESA+T requirements.
6.How does Aetrix verify that MAX1284BESA+T is sourced from the original manufacturer or authorized distributors?
All MAX1284BESA+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 MAX1284BESA+T meets industry standards.
7.What is the process for return or replacement of MAX1284BESA+T?
All MAX1284BESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1284BESA+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 MAX1284BESA+T part is unused and in its original packaging.
Return procedure for MAX1284BESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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