{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MAX1285BESA+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"MAX1285BESA","canonicalUrl":"https://icboms.com/analog-devices/MAX1285BESA","factsUrl":"https://icboms.com/api/mcp/products/MAX1285BESA%2B","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices MAX1285BESA+ SAR ADC, 12-bit, 300k SPS, single-ended input, SPI, internal reference, 8-SOIC (0.154\", 3.90mm Width), tube.","salesMarkdown":"## What this 12-bit SAR ADC actually does on your board The MAX1285BESA+ is a 12-bit successive-approximation-register (SAR) ADC that converts a single-ended analog input to a digital word at up to 300k samples per second. The SAR architecture means each conversion completes in one clock cycle — no pipeline delay — so the output at any sample instant corresponds to that exact input voltage, not the one from two clocks ago. That matters when you are digitising a control-loop feedback signal or a transient event that cannot tolerate a sample-to-output latency. Data is read out over a standard SPI interface, which any microcontroller with a spare SPI port can drive. The conversion is initiated by a chip-select edge; the result shifts out on the MISO line synchronously with the serial clock. No external timing logic is required. ## Package and board-fit: 8-SOIC layout notes The package is surface-mount only — no through-hole variant exists. The reference bypass pin (REF) also needs a 0.1 µF cap to ground — the datasheet layout example places it on the same side of the IC as the analog input to keep the high-impedance trace short. The analog input (AIN) is single-ended and referenced to the GND pin. The input impedance varies during the sampling phase — the internal sampling capacitor draws a current spike at the start of each conversion. A low-impedance source (below 10 kΩ) or an input buffer op-amp is recommended to keep the settling time within the acquisition window. ## Temperature grade and operating environment This suits it for outdoor telecom equipment, factory-floor sensors, and automotive cabin applications (though it is not AEC-Q100 qualified). The 8-SOIC package's thermal impedance (θJA ~120°C/W in still air) means the internal junction stays well below the 150°C absolute maximum at any ambient within the rated range, as long as the power dissipation stays under about 500 mW — which the 3.6 V supply and 1.5 mA typical supply current easily satisfy.","metaTitle":"MAX1285BESA+ ADC, 12-bit SAR, 300k SPS, 8-SOIC","metaDescription":"Analog Devices MAX1285BESA+ 12-bit SAR ADC, 300k samples/sec, single-ended input, SPI interface, 8-SOIC package. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Package":"Tube","Input Type":"Single Ended","Architecture":"SAR","Configuration":"S/H-ADC","Mounting Type":"Surface Mount","Data Interface":"SPI","Number of Bits":"12","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Reference Type":"Internal","Ratio - S/H:ADC":"1:1","lifecycle_stage":"eol_hot","Number of Inputs":"1","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"8-SOIC","Number of A/D Converters":"1","Voltage - Supply, Analog":"2.7V ~ 3.6V","Voltage - Supply, Digital":"2.7V ~ 3.6V","Sampling Rate (Per Second)":"300k"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$23.61","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$23.61000","currency":"USD"},{"qty":10,"price":"$21.77100","currency":"USD"},{"qty":25,"price":"$20.79280","currency":"USD"},{"qty":100,"price":"$18.59130","currency":"USD"},{"qty":250,"price":"$17.73508","currency":"USD"},{"qty":500,"price":"$16.87892","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/87536239947e0dc486cbfe3ecfa6d8bb.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the sampling rate and resolution of the MAX1285BESA+?","answer":"It is a 12-bit SAR ADC with a maximum sampling rate of 300,000 samples per second (300 kSPS). The 12-bit resolution gives 4096 discrete output codes over the input voltage range."},{"question":"What supply voltage does the MAX1285BESA+ need?","answer":"No separate analog and digital supply rails are required."},{"question":"What digital interface does the MAX1285BESA+ use?","answer":"It uses a standard SPI (Serial Peripheral Interface) for communication. The conversion is initiated by asserting the chip-select line, and the 12-bit result is clocked out on the MISO pin synchronously with the serial clock."},{"question":"What package is the MAX1285BESA+ available in?","answer":"The package option is tube (not tape-and-reel)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/MAX1285BESA","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/MAX1285BESA when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}