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Analog Devices Inc./Maxim Integrated MAX1285BESA+
- Part No.:
- MAX1285BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1285BESA+.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
MAX1285BESA+ from Maxim Integrated is a 12-bit serial analog-to-digital converter (ADC) optimized for low-power, space-constrained systems operating from a single +2.7V to +3.6V supply. It delivers 300ksps sampling rate, ±1LSB INL/DNL accuracy, internal +2.5V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface - enabling direct connection to microcontrollers in battery-powered instrumentation and remote sensor nodes.
For engineers reviewing the MAX1285BESA+ datasheet, MAX1285BESA+ pinout, MAX1285BESA+ application, or MAX1285BESA+ equivalent, this page provides verified technical context, package-validated pin functions, real-world use-value per application, and two confirmed alternative parts with documented functional and parametric distinctions.
Technical Context
The MAX1285BESA+ employs a successive-approximation register (SAR) architecture with integrated track/hold and trimmed internal 2.5V reference. Conversion is initiated by CS falling edge and clocked by external SCLK up to 4.8MHz, producing unipolar 12-bit output in MSB-first serial format with three leading zeros.
It operates in two modes: normal (IDD = 2.5–3.5mA at 300ksps) and shutdown (ISHDN ≤ 10µA), with wake-up delay dependent on REF bypass capacitor discharge. Input full-scale range is 0V to VREF (0–2.5V), supported by input protection diodes clamping to GND–0.3V and VDD+0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - supports 4096 discrete digital codes across 0–2.5V input range |
| Sampling Rate | 300ksps - enables real-time capture of signals up to 250kHz full-linear bandwidth |
| INL / DNL | ±1LSB max - guarantees monotonicity and <0.025% end-point linearity error |
| Supply Voltage | +2.7V to +3.6V - compatible with Li-ion, 3.3V logic, and low-voltage embedded rails |
| Reference | +2.5V internal (±2mV initial tolerance, ±15ppm/°C tempco) - eliminates external reference component and layout area |
| Power Consumption | 2.5mA typical at 300ksps - enables >100hr operation on 800mAh battery in periodic-sampling mode |
| Serial Interface | SPI/QSPI/MICROWIRE 3-wire - requires only SCLK, CS, DOUT; no level shifters needed for 3.3V µP |
Pinout & Package
MAX1285BESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and rated for –40°C to +85°C industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog core, reference, and digital interface |
| AIN (Pin 2) | Analog input | Single-ended 0–2.5V input referenced to internal VREF; protected to GND–0.3V/VDD+0.3V |
| SHDN (Pin 3) | Active-low shutdown control | Pulling low reduces supply current to ≤10µA; wake-up time depends on 4.7µF REF bypass cap |
| REF (Pin 4) | Internal reference output | 2.5V ±2mV source capable of driving ≤750µA; requires 4.7µF ceramic bypass to GND |
| GND (Pin 5) | Analog/digital ground | Single-pin common return; must be connected to star ground point for optimal noise performance |
| DOUT (Pin 6) | Serial data output | Three-state CMOS output; drives MSB-first 12-bit result with three leading zeros after CS fall |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion and enables DOUT; high state places DOUT in high-impedance |
| SCLK (Pin 8) | Serial clock input | Drives conversion timing and data shift-out; accepts 0.5–4.8MHz clock with 40–60% duty cycle |
Key Features
| Feature | Design Value |
|---|---|
| Internal +2.5V reference | Eliminates need for external reference IC or resistor divider, reducing BOM count and layout area by ≥2 components |
| 3-wire SPI/QSPI/MICROWIRE interface | Direct compatibility with standard microcontroller peripherals - no glue logic or protocol translation required |
| Low-power shutdown mode | Reduces quiescent current to ≤10µA, enabling energy harvesting or multi-year battery life in wake-on-event systems |
| Industrial temperature range | –40°C to +85°C operation validated across full electrical specs - suitable for outdoor sensors and factory-floor DAQ |
| Monotonic 12-bit transfer function | Guaranteed no missing codes over temperature - critical for closed-loop control and precision measurement |
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 analog front-end op-amps and sensors. Use Value: 300ksps capability allows oversampling for noise reduction; internal reference ensures consistent scaling across units without calibration drift. |
Use Scenario: Handheld blood glucose meter requiring accurate, low-noise conversion of electrochemical sensor current. IC Role / Device Role / Timing Role: Signal-chain ADC capturing analog output from transimpedance amplifier before digital processing. Use Value: ±1LSB INL/DNL and 70dB SINAD ensure clinical-grade accuracy; 2.7–3.6V supply matches single-cell Li-ion operation. |
| Battery-Powered Instruments | Process Control Sensors |
Use Scenario: Field-deployable multimeter with auto-ranging analog inputs and LCD display. IC Role / Device Role / Timing Role: High-accuracy ADC handling multiple input ranges via programmable gain amplifier (PGA) front-end. Use Value: Internal 2.5V reference provides stable full-scale reference independent of battery voltage sag during discharge. |
Use Scenario: Industrial 4–20mA loop-powered transmitter monitoring tank level or flow rate. IC Role / Device Role / Timing Role: Precision ADC converting sensor bridge output into digital signal for HART or Modbus RTU transmission. Use Value: –40°C to +85°C rating and 250kHz full-linear bandwidth support reliable operation in harsh plant environments with fast transient response. |
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; 8-pin SOIC | Lacks internal reference - adds BOM cost and layout complexity; lower speed limits dynamic signal capture | Select when system already uses shared precision reference rail and lower sampling rate is acceptable |
| MAX11131AUT+ | 2.7–3.6V supply; 500ksps; internal 2.048V reference; SPI-only interface; 8-pin µMAX | Higher speed and smaller package but different reference voltage - requires firmware scaling adjustment | Select when higher throughput or board space savings outweigh reference voltage mismatch impact |
Compared with MAX1285BESA+, ADS7822U trades internal reference and speed for broader supply flexibility, while MAX11131AUT+ offers faster sampling and smaller footprint at the cost of reference voltage mismatch and reduced interface compatibility.
Availability
MAX1285BESA+ is available at Aetrix Electronics and suitable for portable data logging, medical instruments, and battery-powered instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1285BESA+ 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 demanding industrial, medical, and communications applications.
The MAX1284/MAX1285 family was engineered to deliver high-accuracy, low-power, single-supply 12-bit ADC functionality in minimal footprint - targeting space- and energy-constrained sensing and instrumentation systems.
FAQ
What is the maximum sampling rate of the MAX1285BESA+?
The MAX1285BESA+ achieves a maximum sampling rate of 300ksps under specified conditions: VDD = +2.7V to +3.6V, fSCLK = 4.8MHz, and 16 clock cycles per conversion. This rate supports full-linear bandwidth up to 250kHz and is validated across the –40°C to +85°C temperature range. The MAX1285BESA+ does not support the 400ksps rate of the MAX1284 variant.
Does the MAX1285BESA+ require an external reference voltage?
No, the MAX1285BESA+ integrates a factory-trimmed +2.5V reference with ±2mV initial accuracy and ±15ppm/°C temperature coefficient. The REF pin must be bypassed with a 4.7µF ceramic capacitor to GND for stable operation. Using an external reference is unnecessary and may degrade performance unless specifically designed for ratiometric or differential configurations.
What digital interfaces are compatible with the MAX1285BESA+?
The MAX1285BESA+ supports SPI, QSPI, and MICROWIRE protocols via its 3-wire serial interface (SCLK, CS, DOUT). It requires CPOL = 0 and CPHA = 0 for SPI/MICROWIRE, or CPOL = 0 and CPHA = 1 for QSPI. No external logic or level shifters are needed for direct connection to 3.3V microcontrollers.
How does shutdown mode affect power consumption in the MAX1285BESA+?
Pulling SHDN low reduces MAX1285BESA+ supply current to ≤10µA (typical 2µA), enabling ultra-low-power standby. Wake-up time depends on charge recovery of the 4.7µF REF bypass capacitor and can reach 2ms after prolonged shutdown. During active conversion at 300ksps, typical supply current is 2.5–3.5mA at VDD = +3.6V.
What is the analog input voltage range for the MAX1285BESA+?
The MAX1285BESA+ accepts a unipolar analog input (AIN) from 0V to VREF (0–2.5V) when using the internal reference. Input protection diodes allow safe operation from GND–0.3V to VDD+0.3V, but accurate conversion is guaranteed only within the 0–2.5V range referenced to the internal 2.5V reference.
MAX1285BESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 300k
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1285BESA+ FAQ
1.How can I place an order for MAX1285BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1285BESA+ 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 MAX1285BESA+ reliable?
The price and inventory of MAX1285BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1285BESA+ is usually 5 days.
3.What payment methods are accepted for MAX1285BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1285BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1285BESA+?
MAX1285BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1285BESA+ 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 MAX1285BESA+?
For technical support, including MAX1285BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1285BESA+ requirements.
6.How does Aetrix verify that MAX1285BESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1285BESA+ 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 MAX1285BESA+ meets industry standards.
7.What is the process for return or replacement of MAX1285BESA+?
All MAX1285BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1285BESA+, 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 MAX1285BESA+ part is unused and in its original packaging.
Return procedure for MAX1285BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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