MAX1241CCSA - 12-bit 73 kSPS SAR ADC | Maxim Integrated
部品番号: MAX1241CCSA ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $6.12 | $6.12 |
| 10 | $5.51 | $55.10 |
| 100 | $4.86 | $486.00 |
| 500 | $4.32 | $2,160.00 |
| 1,000 | $3.78 | $3,780.00 |
MAX1241CCSA 概要
A Successive Approximation Register (SAR) ADC is a converter architecture that uses a binary-search algorithm and an internal capacitive DAC to resolve an analog input against a reference voltage. SAR ADCs sit in the data-converter family tree between flash converters (very fast, low resolution) and sigma-delta converters (very high resolution, slower). Because each conversion occurs in a deterministic number of clock cycles with no latency, SAR ADCs are favored where low-latency control loops or triggered single-shot acquisitions are needed - exactly the role MAX1241 is designed to fill.
Key features include low power consumption (typically 5 microwatts in power-down mode), a power-down input that reduces supply current between conversions for battery-powered designs, and an on-chip clock that eliminates the need for an external timing source. The MAX1241 is the wider-supply counterpart to the MAX1240, which adds an internal 2.5V reference and operates on +2.7V to +3.6V only.
The internal core uses a charge-redistribution DAC array matched with a precision comparator, and the track/hold front-end settles the sampled input within 1.5 microseconds before the SAR state machine resolves the 12-bit code. Because the device has no pipeline delay, it produces a valid conversion on every CS falling-edge trigger, simplifying interrupt-driven firmware in microcontroller-based acquisition loops.
Typical applications include portable data loggers, process-control front ends, battery-powered instrumentation, isolated sensor read-out via SPI, and embedded measurement systems where the host MCU already provides a serial port. The wide supply tolerance lets one PCB artwork serve both 3.3V and 5V MCU platforms by only swapping the LDO.
A design consideration is that the MAX1241 requires an external reference - if board real estate or accuracy is critical, the pin-compatible MAX1240 supplies an internal 2.5V reference at the cost of a tighter supply range. Decouple VDD with 0.1 microfarat ceramic + 1 microfarat tantalum placed within 5 millimeters of the pin, and route REF high-current return directly to GND.
This page synthesizes distributor pricing, drop-in alternatives, pin-level comparison, and practical design notes beyond what the manufacturer datasheet presents in isolation.
ドロップイン代替品: MAX1241CCSA — 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: MAX1241CCSA （同一形状・フットプリント） — 相違点: MSL Level, Package, Resolution, RoHS Status, Supply Voltage (VDD).
クイック比較ツール — 並列比較する代替部品を選択:
MAX1241CCSA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1240CCSA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1241BESA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1241CESA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2360CTS8
✅ ドロップイン✓ 在庫あり
$3.45 / 個
データシートを見る →MAX1116EKA+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1241CCSA 最大定格＆電気的特性
| 分解能 | 12 bits |
| Number of Inputs | 1 (single-ended) |
| Conversion Architecture | Successive Approximation (SAR) |
| Conversion Time | 7.5 us (typical) |
| Throughput | 73 kSPS (max) |
| Track/Hold Acquisition Time | 1.5 us |
| Supply Voltage (VDD) | +2.7 V to +5.25 V (single supply) |
| Power-Down Current | 5 uW (typical) |
| Reference Type | External (MAX1241); internal 2.5 V on MAX1240 |
| Reference Input Range | 0 V to +5.25 V (includes VDD rail) |
| Analog Input Range | 0 V to VREF |
| Serial Interface | 3-wire SPI / QSPI / MICROWIRE-compatible |
| パッケージ | 8-pin SOIC (NSOIC, 150 mil) |
| 実装タイプ | Surface Mount |
| 動作温度範囲 | 0C to +70C (C suffix, commercial) |
| RoHS ステータス | Compliant (lead-free + suffix) |
| MSLレベル | 1 (per JEDEC J-STD-020) |
MAX1241CCSA ピン構成
| ピン 1 | VDD — Analog +2.7V to +5.25V supply voltage |
| ピン 2 | AIN — Analog input (single-ended, 0V to VREF) |
| ピン 3 | GND — Ground |
| ピン 4 | REF — External reference voltage input (0V to +5.25V); REF bypass required |
| ピン 5 | DOUT — Serial data output - drives the 12-bit conversion result MSB-first |
| ピン 6 | SSTRB — Conversion status strobe - high during active conversion, falls when data valid |
| ピン 7 | CS — Chip select input (active low) |
| ピン 8 | SCLK — Serial clock input - clocks DOUT data out on falling edges |
主な用途
MAX1241CCSA の用途: 6 件s: Portable Battery-Powered Data Logger, Industrial Process-Control Analog Input, Digital Panel Meter and Handheld Instrumentation, Microcontroller-Based Sensor Read-Out Module, Isolated Analog Front End via SPI Digital Isolator, Embedded Measurement and Test Equipment.
Portable Battery-Powered Data Logger
The MAX1241CCSA's 5 microwatts power-down current and single 2.7V to 5.25V supply make it a strong fit for battery-powered data loggers that wake on a timer, take a single 12-bit reading, and return to standby. A complete sensor-frontend (thermistor or strain gauge bridge + instrumentation amp) feeds the AIN pin, and the host MCU samples via the 3-wire serial port between sleeps. The 7.5 microsecond conversion time and 1.5 microsecond acquisition mean an entire wake/sample/store/read cycle stays under 50 microseconds per channel, preserving battery life while still capturing 12-bit resolution. Compared to sigma-delta alternatives that need settling windows, the deterministic SAR conversion is interrupt-friendly and decouples firmware timing from sample rate.
おすすめ
Industrial Process-Control Analog Input
In a 4 mA to 20 mA loop or 0 V to 10 V transducer front end, the MAX1241CCSA delivers factory-floor measurement resolution with a small BOM. The external reference lets designers scale the input range to match the transducer exactly - for example, a 4.096 V reference yields 1 mV per LSB, ideal for displaying engineering units directly. The 73 kSPS throughput comfortably handles multiplexed scanning of up to a dozen analog channels via an external analog MUX, while the SPI protocol hands off data to an industrial MCU or PLC front end. The wide +2.7 V to +5.25 V supply tolerance keeps the input card compatible with both legacy 5 V PLC backplanes and modern 3.3 V MCU-based platforms.
おすすめ
Digital Panel Meter and Handheld Instrumentation
Handheld DMMs and panel meters need 12-bit absolute accuracy, low power, and a stable readout over battery-discharge variations. The MAX1241CCSA captures a single voltage, current, or temperature-derived analog signal per trigger, while the host MCU drives the LCD. The external reference (e.g. MAX6126) provides the long-term stability and low drift that a meter requires to hold calibration across the operating envelope. The 8-pin SOIC package lowers total BOM cost relative to larger ADCs, and the SPI bus avoids tying up extra MCU I/O. Unlike slower sigma-delta ADCs, the SAR latency is short enough that updates feel responsive even at high display refresh rates.
おすすめ
Microcontroller-Based Sensor Read-Out Module
Many sensor modules - thermocouples, RTDs, load cells, and gas sensors - output a low-level analog signal that needs digitising before forwarding to a host processor. The MAX1241CCSA's 3-wire SPI interface attaches directly to standard microcontroller serial ports with no glue logic, allowing the sensor module to expose a digital command set while keeping analog isolation local. Its deterministic 7.5-microsecond conversion removes sampling-jitter artefacts from PID and waveform-reconstruction firmware. With +2.7V to +5.25V supply tolerance, the same reference design serves battery-powered wireless sensor nodes (3.3 V) and industrial wired transmitters (5 V).
おすすめ
Isolated Analog Front End via SPI Digital Isolator
In motor drives, solar inverters, and medical equipment, the analog signal must cross a high-voltage isolation barrier via a digital isolator. The MAX1241CCSA digitises the analog signal on the low-voltage field side, then the SPI frame crosses the isolator as robust CMOS edges, eliminating analog isolation challenges. The 73 kSPS rate handles most current and voltage telemetry loops with margin, and the SAR latency keeps feedback loops stable. Because the converter draws only 5 microamps in power-down, it is easy to budget power across an isolated DC-DC converter. The MAX12931 digital isolator pairs naturally here, providing reinforced isolation ratings in industrial and medical designs.
おすすめ
Embedded Measurement and Test Equipment
Bench-grade multimeters, calibrators, and benchtop data-acquisition modules require 12-bit absolute accuracy and deterministic latency, both of which the MAX1241CCSA provides. The deterministic SAR conversion eliminates the input-multiplexer settling windows required by sigma-delta ADCs, simplifying channel-switching firmware. Combined with an external MAX6126 reference and external precision front-end amplifiers, the assembly reaches better than 1 LSB INL across the full industrial temperature range. The 8-pin SOIC footprint means it fits even very compact PCBs - including handheld enclosures and rack-mount front panels.
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: MAX1241CCSA — 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 | MAX1241CCSA+ | MAX1240CCSA+ | MAX1241BESA+ | LTC2360CTS8 | MAX1116EKA+T |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (formerly Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-pin SOIC (NSOIC, 150 mil) | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same footprint option | 8-pin SOT-23 - smaller footprint |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 8 bits - lower |
| Supply Voltage | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +3.6V (narrower) | +2.7V to +5.25V | +2.7V to +5.25V (typical SAR) | +2.7V to +5.5V |
| Reference | External (REF pin) | External | Internal 2.5V | External | External | External |
| Operating Temperature | 0C to +70C (C-grade commercial) | 0C to +70C | 0C to +70C | -40C to +85C (E-grade industrial) | 0C to +70C | -40C to +85C |
| Serial Interface | 3-wire SPI / QSPI / MICROWIRE | 3-wire SPI | 3-wire SPI | 3-wire SPI | SPI - verify pin map | SPI |
主な差別化要因
- External reference flexibility （vs MAX1240CCSA+)
- Wide +2.7V to +5.25V supply tolerance （vs MAX1240CCSA+)
- 5 microwatt power-down current （vs LTC2360CTS8)
- Deterministic 7.5 microsecond latency （vs MAX1116EKA+T)
設計ノート
Estimated: Decouple the VDD pin with 0.1 microfarat X7R ceramic in parallel with 1 microfarat tantalum placed within 5 millimeters of the package pin; route the trace for the capacitor directly to the GND pin to minimise supply-rail ringing during SAR conversion. Use a low-impedance ground return for the REF pin to keep the reference stable during acquisition - the SAR architecture draws current transients on REF only at the start of acquisition. For battery-powered designs, drive the SHDN pin low between conversions to reach the 5 microwatt quiescent target and bring the device back high with at least 1 microsecond settling margin before CS pulses.
Estimated: The MAX1241CCSA samples the analog input through an internal capacitive DAC, so heavy source impedance above 1 kilohm will introduce gain error at the track/hold aperture. Drive AIN with an op-amp buffer capable of settling to 12-bit accuracy (better than 0.5 LSB) within 1.5 microseconds. For 5 kohm or larger sources, add a 100 picofarad capacitor directly across the AIN and GND pins to limit the input-bandwidth noise; the LSB weight at 5V reference is approximately 1.22 millivolts, so 500 microvolts of induced noise is still within budget but should be characterised.
Keep the AIN trace short and surrounded by GND to minimise digital-to-analog crosstalk from the serial interface. Route SCLK and CS away from the analog section, and place a GND guard ring around the reference capacitor to keep switching transients out. If using the MAX1241 in a 4-layer board, put the analog ground on layer 2 with stitching vias, and keep the digital return currents on layer 4. The SSTRB pin signals conversion completion and should be left to the MCU to poll only when a real-time sync is required; unused connection here is acceptable.
Estimated: Do not use the MAX1241CCSA above +5.25V supply - the absolute-maximum is +6V and operation beyond +5.25V stresses the charge-pump and SAR DAC. Do not exceed the REF pin VREF +0.3V at any time, including transients; a violation can permanently damage the device. If you need 5V supply and 5V reference simultaneously, consider the MAX1241CESA+ which can accept 5.25V but requires careful analog-headroom accounting. Finally, remember that the C-suffix commercial variant is rated 0C to +70C - select the E-suffix variant (for example MAX1241CESA+ or MAX1241BESA+) for industrial deployments.
コンプライアンス情報
MAX1241CCSA+ suffix denotes lead-free / RoHS-compliant finish per Maxim/Analog Devices product page; commercial-grade part not AEC-Q100 qualified. Halogen-free status not explicitly listed in the verified web data and is set to unknown per data authenticity rules.
