MAX1285BCSA-T - 12-Bit 300ksps SAR ADC | Analog Devices
部品番号: MAX1285BCSA-T ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $7.62 | $7.62 |
| 10 | $6.96 | $69.60 |
| 100 | $6.21 | $621.00 |
| 500 | $5.55 | $2,775.00 |
| 1,000 | $4.89 | $4,890.00 |
MAX1285BCSA-T 概要
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that samples a continuous analog input voltage and quantizes it into a discrete digital code; the successive-approximation register (SAR) topology is a popular low-power architecture that performs a binary search against an internal DAC one bit per clock cycle, producing low latency, deterministic throughput at modest sample rates. Within the broader mixed-signal hierarchy, SAR ADCs sit alongside sigma-delta, pipeline, and flash converters, and are favored in multiplexed data-acquisition, instrumentation, and process-control signal chains where 8 to 18 bits of resolution are sufficient and low-latency deterministic conversion is critical.
Key specifications for the MAX1285BCSA-T include 12-bit resolution, one analog input channel, up to 300 ksps throughput on the single +2.7 V to +3.6 V supply, an internal +2.5 V reference (reducing external component count), and an integrated track/hold amplifier that delivers full 12-bit accuracy at the rated conversion rate. The part ships in an 8-pin SOIC package and offers a low-power shutdown mode that drops quiescent consumption between conversions for battery-powered data loggers. Compared with the related MAX1284 family member, the MAX1285 sacrifices 100 ksps of maximum sample rate in exchange for operation at lower supply voltages.
The architecture combines a charge redistribution DAC, an on-chip clock, and a digital comparator in a single silicon die; the integrated reference eliminates the BOM, calibration drift, and board area associated with an external series reference. The 8-pin SOIC footprint is hand-solder-friendly and reflow-compatible, simplifying prototype work and high-volume assembly alike.
Typical applications include portable instrumentation, isolated data-acquisition front ends, thermocouple and bridge sensor signal chains, industrial process-control analog input modules, and battery-powered medical or test-and-tunable sensors. Designers choose the MAX1285 when they need single-supply operation below 3.6 V, an integrated reference, and 12-bit resolution in a compact 8-pin SOIC.
When designing with this ADC, place a 10 nF ceramic bypass capacitor as close as possible to the supply pin and an RC network at AIN to limit input kickback; use the shutdown input to manage quiescent current in duty-cycled battery applications. This page synthesizes distributor stock, drop-in equivalents, and practical layout notes not consolidated in the manufacturer datasheet, aiding rapid design-in.
ドロップイン代替品: MAX1285BCSA-T — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: MAX1285BCSA-T （同一形状・フットプリント） — 相違点: Package, Resolution, Number of Channels, RoHS Status, Input Type.
クイック比較ツール — 並列比較する代替部品を選択:
MAX1285BCSA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1285BESA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1285BESA+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1285BCSA+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1284BCSA+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1284ACSA+T
✅ ドロップイン✓ 在庫あり
$6.45 / 個
データシートを見る →MAX1285BCSA-T 最大定格＆電気的特性
| 分解能 | 12 bit |
| Number of Input Channels | 1 |
| Converter Type | SAR (Successive Approximation) |
| Sample Rate | 300 ksps |
| Supply Voltage Range | +2.7 V to +3.6 V (single supply) |
| Internal Reference Voltage | +2.5 V |
| Input Type | Single-ended, analog |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible |
| Track/Hold | Integrated, on-chip |
| パッケージ | 8-pin SOIC (150-mil, gull-wing) |
| 実装タイプ | Surface Mount |
| 動作温度範囲 | 0C to +70C (commercial grade) |
| Temperature Grade | Commercial |
| Terminal Form | Gull Wing |
| Number of Terminals | 8 |
| Package Code | SOP (SOIC) |
| RoHS ステータス | Compliant |
MAX1285BCSA-T ピン構成
| ピン 1 | AIN — Analog input (single-ended) |
| ピン 2 | CS — Chip-select input (active-low) |
| ピン 3 | SHDN — Shutdown input (active-low) |
| ピン 4 | GND — Analog ground |
| ピン 5 | REF — Internal +2.5 V reference output / bypass |
| ピン 6 | DOUT — Serial data output |
| ピン 7 | SCLK — Serial clock input |
| ピン 8 | VDD — +3.3 V supply |
主な用途
MAX1285BCSA-T の用途: 6 件s: Portable Data Acquisition, Industrial Process Control Analog Input Module, Battery-Powered Sensor Signal Chains, Thermocouple and Bridge Sensor Readout, Test and Measurement Instrumentation, Isolated Data Acquisition Front End.
Portable Data Acquisition
The MAX1285BCSA-T's 12-bit resolution, 300 ksps throughput, and single +2.7 V to +3.6 V operation fit portable 4-20 mA loop-powered data loggers. The internal +2.5 V reference eliminates an external reference, while the SPI/QSPI/MICROWIRE-compatible serial interface streams data efficiently to a low-power microcontroller. Designers benefit from the integrated track/hold amplifier that captures fast transient signals without external buffers; the 8-pin SOIC footprint keeps the analog front-end compact. Compared with higher-speed pipeline ADCs, the SAR architecture delivers deterministic latency that simplifies sample timing in battery-powered field instruments. Use a 10 nF supply bypass cap and configure the shutdown pin to drop quiescent current between conversions.
おすすめ
Industrial Process Control Analog Input Module
In 4-20 mA industrial signal chains, the MAX1285BCSA-T converts a single-ended analog sensor input to a 12-bit code at up to 300 ksps on a single 3.3 V rail. The internal +2.5 V reference removes drift concerns tied to external references, and the SPI-compatible serial interface feeds data directly to an industrial microcontroller or DSP. The 8-pin SOIC package fits the analog-input board footprint, and the part's 0C to +70C commercial temperature grade supports factory-floor installations inside an enclosure. Designers place a small RC network at AIN to limit charge-kickback; the integrated track/hold ensures full 12-bit accuracy at the rated throughput.
おすすめ
Battery-Powered Sensor Signal Chains
The MAX1285BCSA-T's +2.7 V to +3.6 V supply range aligns with a single Li-ion cell above its safe-discharge cutoff, making the ADC ideal for wireless sensor nodes, wearables, and IoT edge devices. The internal +2.5 V reference removes a power-hungry external reference from the BOM, and the hardware shutdown pin drops quiescent current to microampere levels between samples - critical for duty-cycled battery-powered designs. The 8-pin SOIC keeps the analog island small on the PCB, and the SAR topology delivers deterministic conversion time that simplifies the microcontroller's power-state machine. Use the shutdown pin in firmware to extend battery life across weeks or months of service.
おすすめ
Thermocouple and Bridge Sensor Readout
For thermocouple and bridge sensor readouts, the MAX1285BCSA-T delivers 12-bit resolution at up to 300 ksps from a single 3.3 V supply, with an internal +2.5 V reference that powers the bridge excitation indirectly through a buffer. The integrated track/hold amplifier preserves full-scale accuracy during the SAR conversion, while the SPI/QSPI/MICROWIRE-compatible serial interface streams temperature data to a host microcontroller. Designers pair the MAX1285BCSA-T with a low-noise precision op-amp (such as the MAX4165) to amplify microvolt-level sensor signals; the SOIC-8 footprint simplifies layout with the analog signal chain on the same board.
おすすめ
Test and Measurement Instrumentation
Bench-top digital multimeters and oscilloscope front-ends benefit from the MAX1285BCSA-T's 12-bit resolution at 300 ksps. The internal +2.5 V reference simplifies calibration in production test fixtures, while the SPI-compatible serial interface integrates cleanly with FPGA-based acquisition controllers (such as MAX II CPLDs or similar). The 8-pin SOIC package drops into the analog front-end board, and the SAR topology's deterministic latency aligns precisely with the test-and-measurement acquisition window. Compared with higher-resolution delta-sigma ADCs, the MAX1285BCSA-T trades resolution for speed, capturing fast transients that slower ADCs would miss.
おすすめ
Isolated Data Acquisition Front End
For isolated analog-input modules (e.g., 4-20 mA receivers or medical isolation barriers), the MAX1285BCSA-T converts the analog input to a 12-bit code on the field side of the isolation barrier; the SPI-compatible serial interface drives an isolator (digital isolator or optocoupler) that carries the data across the barrier. The internal +2.5 V reference removes a power-hungry external reference from the isolated side, simplifying the isolated power supply. Designers benefit from the 8-pin SOIC's compact footprint, which fits the small isolated board area; the SAR architecture's deterministic latency ensures that data integrity is preserved across the isolation barrier.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX1285BCSA-T — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MAX1285BCSA+ | MAX1285BESA+ | MAX1285BESA+T | MAX1285BCSA+T | MAX1284BCSA+T | MAX1284ACSA+T |
|---|---|---|---|---|---|---|---|
| Package | 8-pin SOIC (150-mil) | 8-pin SOIC (150-mil) - same | 8-pin SOIC (208-mil) - same SOIC family | 8-pin SOIC (208-mil) - same SOIC family | 8-pin SOIC (150-mil) - same | 8-pin SOIC (150-mil) - same | 8-pin SOIC (150-mil) - same |
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) - same | Analog Devices (Maxim Integrated) - same | Analog Devices (Maxim Integrated) - same | Analog Devices (Maxim Integrated) - same | Analog Devices (Maxim Integrated) - same | Analog Devices (Maxim Integrated) - same |
| Resolution | 12 bit | 12 bit - same | 12 bit - same | 12 bit - same | 12 bit - same | 12 bit - same | 12 bit - same |
| Sample Rate | 300 ksps | 300 ksps - same | 300 ksps - same | 300 ksps - same | 300 ksps - same | 400 ksps - faster (+33%) | 400 ksps - faster (+33%) |
| Supply Voltage | +2.7 V to +3.6 V | +2.7 V to +3.6 V - same | +2.7 V to +3.6 V - same | +2.7 V to +3.6 V - same | +2.7 V to +3.6 V - same | +4.5 V to +5.5 V - higher (+67%) | +4.5 V to +5.5 V - higher (+67%) |
| Internal Reference | +2.5 V (yes) | +2.5 V (yes) - same | +2.5 V (yes) - same | +2.5 V (yes) - same | +2.5 V (yes) - same | +2.5 V (yes) - same | +2.5 V (yes) - same |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C (commercial) - same | 0C to +70C (commercial) - same | 0C to +70C (commercial) - same | 0C to +70C (commercial) - same | 0C to +70C (commercial) - same | -40C to +85C (extended) - wider |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible | SPI/QSPI/MICROWIRE-compatible - same | SPI/QSPI/MICROWIRE-compatible - same | SPI/QSPI/MICROWIRE-compatible - same | SPI/QSPI/MICROWIRE-compatible - same | SPI/QSPI/MICROWIRE-compatible - same | SPI/QSPI/MICROWIRE-compatible - same |
主な差別化要因
- Low-voltage single-supply operation （vs MAX1284BCSA+T)
- Compact 150-mil SOIC footprint （vs MAX1285BESA+T)
- Internal +2.5 V reference （vs External reference designs)
設計ノート
Place a 10 nF ceramic bypass capacitor as close as possible to the VDD pin (pin 8) and a 100 nF bulk cap on the supply rail. The internal +2.5 V reference (pin 5) should be bypassed to GND with a 4.7 uF or 10 uF low-ESR ceramic capacitor. For battery-powered designs, drive the SHDN pin (pin 3) low between conversions to drop quiescent current to microampere levels; this is essential for extending runtime in duty-cycled sensor nodes and IoT edge devices.
Route the analog input trace as a guarded, ground-referenced trace; place a small RC anti-aliasing network (typically 100 Ω / 10 pF) at the AIN pin to limit charge-kickback into the source. Keep the digital SCLK and DOUT traces away from the AIN pin to avoid digital-to-analog crosstalk. The 8-pin SOIC package simplifies layout: route VDD and GND on opposite sides of the package for clean return paths, and place the bypass cap directly across VDD-GND.
Do not exceed the absolute maximum VDD of +3.6 V on the MAX1285BCSA-T - the part is a 3.3 V device. Do not operate the part at 5 V on the 3.3 V supply range; if 5 V operation is required, use the MAX1284BCSA-T instead. The internal +2.5 V reference is not designed to drive external loads beyond the recommended bypass cap. The shutdown pin (pin 3) is active-low; leaving it floating can cause unpredictable quiescent current behavior. Always deassert CS (pin 2) before initiating a conversion sequence.
コンプライアンス情報
RoHS compliant per Maxim Integrated product page. Not AEC-Q100 qualified - commercial temperature grade (0C to +70C) only.
