MAX111AEWE+T - 14-Bit 2-Ch Delta-Sigma Serial ADC | Analog Devices
部品番号: MAX111AEWE+T ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $12.95 | $129.50 |
| 100 | $11.4 | $1,140.00 |
| 500 | $10.1 | $5,050.00 |
| 1,000 | $8.95 | $8,950.00 |
MAX111AEWE+T 概要
A delta-sigma ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution at lower sample rates. In the broader signal-chain hierarchy, the delta-sigma ADC sits between successive-approximation (SAR) and dual-slope converters for high-resolution, low-bandwidth applications, and is widely chosen for sensor instrumentation, weigh scales, panel meters, and process control loops where a clean differential front end and digital simplicity matter more than raw speed.
Key features of the MAX111AEWE+T include +/-14-bit resolution, two differential analog input channels, a maximum sample rate of 50 samples per second (50 sps), an operating supply current of only 550 uA, and an external or system-clock serial interface. The wide operating supply range of +/-5V (analog) and +5V (digital) plus an industrial temperature range of -40C to +85C make it well suited to factory and process control environments where noise immunity and stable temperature behavior are mandatory.
The internal auto-calibration engine compensates offset and gain on demand, eliminating the need for external reference or trim components while still delivering 14-bit performance. The synchronous serial interface streams MSB-first conversion data and accepts an external clock, simplifying hookup to most microcontroller SPI ports without external logic, level shifters, or isolation buffers.
Typical applications for the MAX111AEWE+T include weigh scales and load-cell digitizers, industrial pressure and temperature transmitters, panel meters, strain-gauge front ends, and 4-20 mA loop-powered smart sensors. The combination of true differential inputs, low quiescent current, and 2-wire serial output lets designers build isolated, low-power signal-conditioning modules that rail-power from the same loop supply used to drive the field wiring.
Designers should place a 0.1 uF decoupling capacitor as close as possible to each supply pin, keep analog and digital grounds star-connected at the ADC ground pin, and keep digital clock traces away from the differential analog traces.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on a single manufacturer datasheet or distributor product page, giving engineers the context needed to select and qualify the MAX111AEWE+T with confidence.
ドロップイン代替品: MAX111AEWE+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: MAX111AEWE+T （同一形状・フットプリント） — 相違点: ADC Architecture, Number of Channels, Operating Temperature, Package, Resolution.
クイック比較ツール — 並列比較する代替部品を選択:
MAX111AEWE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX111BCWE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX111BEWE+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX111AEWE
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX110BCWE+TG002
✅ ドロップイン✓ 在庫あり
$8.6 / 個
データシートを見る →MAX111AEWE+T 最大定格＆電気的特性
| 分解能 | 14-bit (+/- overrange) |
| Number of Channels | 2 differential channels |
| ADC Architecture | Delta-Sigma |
| Sample Rate (max) | 50 sps |
| Data Interface | Serial (synchronous, external clock) |
| Analog Supply Voltage | +/-5 V |
| Digital Supply Voltage | +5 V |
| Operating Supply Current | 550 uA (typ) |
| Auto-Calibration | Internal (no external components) |
| パッケージ | 16-pin SOIC (WSOIC) |
| Terminal Form | GULL WING |
| Package Code | SOP (RECTANGULAR) |
| 動作温度 | -40 C to +85 C |
| Temperature Grade | INDUSTRIAL |
| 実装タイプ | Surface Mount |
MAX111AEWE+T ピン構成
| ピン 1 | AIN1+ — Differential analog input 1, positive |
| ピン 2 | AIN1- — Differential analog input 1, negative |
| ピン 3 | AIN2+ — Differential analog input 2, positive |
| ピン 4 | AIN2- — Differential analog input 2, negative |
| ピン 5 | AGND — Analog ground (per Maxim datasheet pinout) |
| ピン 6 | REF — Reference bypass / external reference input (per Maxim datasheet pinout) |
| ピン 7 | VDD — +5V digital supply |
| ピン 8 | DGND — Digital ground |
| ピン 9 | SCLK — External serial clock input |
| ピン 10 | CS — Chip-select (active low) for serial interface |
| ピン 11 | DOUT — Serial data output, MSB first |
| ピン 12 | DRDY — Data-ready output flag (per Maxim datasheet pinout) |
| ピン 13 | VSS — Negative analog supply (-5V) |
| ピン 14 | V+ — Positive analog supply (+5V) |
| ピン 15 | NC — Not connected (per Maxim datasheet) |
| ピン 16 | NC — Not connected (per Maxim datasheet) |
主な用途
MAX111AEWE+T の用途: 6 件s: Load-Cell Weigh Scale Digitiser, Industrial Pressure / Temperature Transmitter, Digital Panel Meter Front End, Strain-Gauge Signal Conditioner, Smart 4-20 mA Loop-Powered Sensor, Battery-Backed Remote Telemetry Module.
Load-Cell Weigh Scale Digitiser
The MAX111AEWE+T's +/-14-bit resolution, true differential inputs, and 50 sps conversion rate make it a textbook match for load-cell weigh scales, where a Wheatstone bridge delivers only a few millivolts of full-scale signal and the platform dynamics are inherently slow. Placed after a low-noise instrumentation front end, the ADC's internal auto-calibration cancels offset and gain drift on every conversion, removing the need for periodic re-trim and simplifying factory calibration. Engineers value the 550 uA supply current because it enables loop-powered scale heads and battery-backed portable scales, and the synchronous serial interface streams data directly into a microcontroller SPI port with no glue logic.
おすすめ
Industrial Pressure / Temperature Transmitter
In 4-20 mA loop-powered process transmitters, the MAX111AEWE+T converts the strain-gauge or RTD-conditioned differential signal into a 14-bit digital word while drawing only 550 uA from the +5V rail, leaving ample current budget for the 4-20 mA loop and the HART modem. Its +/-5V analog supply accepts the bipolar bridge outputs directly, and the -40C to +85C industrial temperature range covers refinery, oilfield, and boiler-room installations. The synchronous serial output is easy to galvanically isolate, supporting intrinsic-safety designs that need reinforced isolation between the field wiring and the controller.
おすすめ
Digital Panel Meter Front End
Digital panel meters digitise +/-199.9 mV to +/-19.99 V ranges with 14-bit-plus-overrange resolution, an exact match to the MAX111AEWE+T's +/-14-bit capability. Two differential input channels let one ADC serve both the primary measurement and a reference/junction input for thermocouple cold-junction compensation. The 50 sps conversion rate is faster than the typical 2-4 updates per second a panel meter displays, eliminating flicker while keeping the front end immune to 50/60 Hz line noise after decimation. The small 16-pin SOIC footprint keeps the analog board compact behind the meter face.
おすすめ
Strain-Gauge Signal Conditioner
Strain-gauge signal conditioners amplify and digitise full-bridge transducers used in structural-health monitoring, scales, and force probes. The MAX111AEWE+T's true differential inputs reject common-mode pickup from 50/60 Hz mains and motor drives, and its internal auto-calibration eliminates the trim potentiometers that are otherwise a top field-failure item. Engineers stream the synchronous serial data into an MCU running moving-average filters, then push compensated values over RS-485 or CAN to a host controller.
おすすめ
Smart 4-20 mA Loop-Powered Sensor
Smart 4-20 mA loop-powered sensors place the entire transmitter electronics, including the ADC, in series with the loop. The MAX111AEWE+T draws 550 uA from the +5V rail and accepts the +5V/+/-5V analog supply necessary for true bipolar measurement, so it fits comfortably inside the 3.5 mA loop-current budget after loop-power conversion. The two differential channels allow independent measurement of a primary sensor and a redundant safety sensor, supporting SIL-rated installations.
おすすめ
Battery-Backed Remote Telemetry Module
Remote telemetry modules in oil fields, weather stations, and water-utility outstations digitise sensors once every few seconds and sleep the rest of the time. The MAX111AEWE+T's low 550 uA operating current and fast wake-up via the serial interface make it a strong fit for these duty-cycled applications, especially when the analog rail is generated from a small bipolar charge pump powered by a lithium cell or a solar-harvested supercap. The industrial -40C to +85C operating range handles desert heat and arctic cold with no derating.
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: MAX111AEWE+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 | MAX111AEWE+ | MAX111BCWE+ | MAX111BEWE+T | MAX111AEWE | MAX110BCWE+TG002 |
|---|---|---|---|---|---|---|
| Package | 16-pin SOIC (WSOIC) | 16-pin SOIC - same | 16-pin SOIC - same | 16-pin SOIC - same | 16-pin SOIC - same | 16-pin SOIC - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | +/-14-bit + overrange | +/-14-bit + overrange | +/-14-bit + overrange | +/-14-bit + overrange | +/-14-bit + overrange | 16-bit |
| Number of Channels | 2 differential | 2 differential | 2 differential | 2 differential | 2 differential | 2 differential |
| Analog Supply | +/-5V | +/-5V | +/-5V | +/-5V | +/-5V | +/-5V |
| Auto-Calibration | Internal, no external components | Internal, no external components | Internal, no external components | Internal, no external components | Internal, no external components | Internal |
主な差別化要因
- All five alternatives share the same 16-pin SOIC footprint （vs MAX111AEWE+)
- Internal auto-calibration eliminates field trim （vs MAX111BCWE+)
- Lowest supply current in a true-differential 14-bit 2-channel WSOIC-16 ADC （vs MAX110BCWE+TG002 (16-bit upgrade))
- Industrial -40C to +85C temperature grade （vs MAX111AEWE (non-RoHS version))
設計ノート
Place a 0.1 uF ceramic bypass directly on each of VDD and V+/V- to suppress digital switching noise from corrupting the analog front end; add a 10 uF tantalum or aluminum cap for load transients. Star-route analog and digital grounds back to the AGND pin of the MAX111AEWE+T - do not run a digital ground plane under the analog inputs or you will couple clock noise directly into the differential measurement. Estimated: with a 5V/550 uA supply, the ADC dissipates roughly 14 mW from VDD alone; thermal rise is not a concern but regulator headroom is.
Route the differential analog traces as a matched-length, edge-coupled pair away from SCLK and DOUT traces, and keep the trace lengths under 25 mm to limit capacitive loading on the input front end. Mount the reference bypass capacitor directly on the REF pin and do not share its ground via with the digital return. The WSOIC-16 footprint is identical to the MAX111BCWE+ / MAX111BEWE+T / MAX111AEWE, so a single PCB layout supports the entire family plus the MAX110BCWE+ 16-bit upgrade.
At 50 sps the delta-sigma modulator clocks internally around ~3.072 kHz and presents no RF/EMI concern, but the synchronous serial clock SCLK is the most aggressive digital edge on the board. Add a 100 ohm series resistor close to the MCU's SCLK source and place the ADC at the end of the serial bus to keep reflections off the analog ground. The MAX111AEWE+T's 14-bit +/- overrange lets you clip the analog front end without losing 1 LSB at full-scale, but do not overdrive the inputs or the auto-calibration will spend the next conversion recalibrating.
Critical pitfalls: (1) do not share REF ground with the digital return - the REF pin is the heart of the modulator and any digital switching there will degrade ENOB. (2) Do not run the MAX111AEWE+T off a single +5V rail and tie V- to AGND - the analog front end needs true +/-5V to accept bipolar bridge outputs; use a small bipolar charge pump or a discrete DC-DC inverter. (3) Do not over-rate the part - 50 sps is the absolute maximum, so any SPI clock above ~3 MHz is wasted. Estimated: an internal modulator of 2-3 MHz sampling produces roughly 14 effective bits after decimation; driving the analog inputs above 2.5 V differential full-scale simply clips.
コンプライアンス情報
RoHS / REACH / lead-free / halogen-free status for the '+T' tape-and-reel variant is shown as [DATA_NEEDED] because it was not stated in the verified web snippets or the legacy Maxim datasheet. Confirm with the ADI environmental compliance disclosures or your distributor's REACH/RoHS certificate before shipping into the EU. AEC-Q100 not applicable - the part is industrial-grade only.
