MAX182BCWI - 12-Bit 4-Ch 17ksps ADC with T/H & Reference | Maxim
部品番号: MAX182BCWI ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.85 | $9,850.00 |
MAX182BCWI 概要
An ADC (Analog-to-Digital Converter) is a data-acquisition component that translates real-world continuous analog signals into discrete digital codes readable by a microcontroller, DSP, or processor. In the broader signal-chain hierarchy, the ADC sits between analog front-end conditioning (amplifiers, multiplexers, sensors) and digital processing; multi-channel ADCs like the MAX182 integrate channel switching, sample-and-hold, and reference, replacing a discrete implementation that would otherwise require a separate MUX, T/H, and reference IC. The MAX182 series uses successive-approximation register (SAR) architecture, which provides deterministic latency per conversion ideal for multiplexed data-acquisition systems.
Key features include 17 ksps throughput, a 4.096V internal reference, software-configurable input ranges, on-chip calibration, a track-and-hold amplifier, and a parallel microprocessor interface. The integrated 4.096V reference simplifies analog input scaling for 0-5V or +/-5V ranges by providing 1 LSB = 1 mV resolution when the inputs are configured for unity-gain operation.
Typical applications include industrial process-control data-acquisition systems, multi-loop programmable logic controllers (PLCs), analog I/O cards for PC-based measurement, and precision sensor signal digitisation. Designers select the MAX182 for its combination of integrated reference, multi-channel switching, and parallel interface that simplifies firmware handshaking.
When designing with the MAX182BCWI, carefully review the input-channel protection and reference-bypass capacitor selection for noise immunity. Connect AGND and DGND with a low-impedance star ground near the IC, and add a 10 uF tantalum plus 0.1 uF ceramic bypass capacitor directly on the REF pin.
This page synthesises distributor availability, drop-in pin-compatible alternatives, and practical PCB design guidance for the MAX182BCWI that are not found in the manufacturer datasheet alone.
ドロップイン代替品: MAX182BCWI — 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: MAX182BCWI （同一形状・フットプリント） — 相違点: Data Interface, Internal Reference, Resolution, Sampling Rate.
クイック比較ツール — 並列比較する代替部品を選択:
MAX182BCWI+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX182AEWI+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX182BEWI+
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MAX182ACWI+
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MAX165BCWN
✅ ドロップイン✓ 在庫あり
$12.4 / 個
データシートを見る →MAX1300CMB+
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MAX182BCWI 最大定格＆電気的特性
| 分解能 | 12 bits |
| Number of Input Channels | 4 single-ended / 2 differential |
| Conversion Architecture | Successive Approximation (SAR) |
| サンプリングレート | 17 ksps |
| Input Voltage Ranges | 0 to +5V / 0 to +10V / +/-5V / +/-10V (software-configurable) |
| Data Interface | Parallel (8-bit bus) |
| Internal Reference | 4.096 V |
| Track-and-Hold | Integrated |
| On-Chip Calibration | Yes |
| パッケージ / ケース | 28-SOIC (wide body, 0.300") |
| 実装タイプ | Surface Mount |
MAX182BCWI ピン構成
| ピン 1 | CH0 — Analog input channel 0 |
| ピン 2 | CH1 — Analog input channel 1 |
| ピン 3 | CH2 — Analog input channel 2 |
| ピン 4 | CH3 — Analog input channel 3 |
| ピン 5 | AGND — Analog ground |
| ピン 6 | REF — 4.096 V internal reference output / external reference input |
| ピン 7 | REFADJ — Reference adjust input for calibration |
| ピン 8 | VDD — +5 V (or +12V tolerant) analog supply |
| ピン 9 | VSS — Negative supply input (e.g., -12V or -5V for bipolar ranges) |
| ピン 10 | VEE — -5V charge-pump ground reference |
| ピン 11 | DGND — Digital ground |
| ピン 12 | D0 — Data bit 0 (LSB) |
| ピン 13 | D1 — Data bit 1 |
| ピン 14 | D2 — Data bit 2 |
| ピン 15 | D3 — Data bit 3 |
| ピン 16 | D4 — Data bit 4 |
| ピン 17 | D5 — Data bit 5 |
| ピン 18 | D6 — Data bit 6 |
| ピン 19 | D7 — Data bit 7 (MSB) |
| ピン 20 | INT — Interrupt / end-of-conversion output |
| ピン 21 | MODE — Mode select |
| ピン 22 | WR — Write strobe for control register |
| ピン 23 | RD — Read strobe |
| ピン 24 | CS — Chip select (active low) |
| ピン 25 | CAL — Calibration control |
| ピン 26 | CLK — External clock input |
| ピン 27 | RESET — Reset input (active low) |
| ピン 28 | NC — Not connected (per datasheet) |
主な用途
MAX182BCWI の用途: 6 件s: Industrial Process Control / PLC Analog Input Modules, PC-Based Data Acquisition Cards (DAQ), Precision Sensor Signal Digitisation, Medical Monitoring & Diagnostic Equipment, Automotive Sensor Interface Modules, Battery-Powered Test & Measurement Instrumentation.
Industrial Process Control / PLC Analog Input Modules
The MAX182BCWI's four single-ended input channels and software-configurable +/-10V / 0-10V / +/-5V / 0-5V ranges make it a natural fit for industrial process-control I/O modules reading 4-20 mA-derived voltage signals, thermocouple-conditioned millivolts, and 0-10V valve-actuator feedback. Its 17 ksps throughput exceeds the typical PLC scan requirement of 1-10 ksps, leaving margin for time-multiplexing multiple channels. The on-chip 4.096V reference plus software calibration let designers hit 0.1% FSR gain accuracy after a single-room-temperature trim, and the wide-body 28-SOIC package has the creepage and clearance margins often required for industrial modules up to 24V common-mode.
おすすめ
PC-Based Data Acquisition Cards (DAQ)
The MAX182BCWI's parallel 8-bit data interface allows direct connection to ISA, PC/104, and modern FPGA-soft-core bus implementations on PC-based DAQ cards without glue logic. The integrated track-and-hold and four-channel multiplexer remove the need for separate MUX and T/H ICs on the analog front end, reducing board area to roughly half that of discrete designs. At 17 ksps aggregate the part suits medium-speed vibration, strain-gauge, and temperature logging boards, and the on-chip 4.096V reference lets each channel scale directly to engineering units in mV/LSB. Designers pair it with precision op-amp buffers to drive its input at full speed.
おすすめ
Precision Sensor Signal Digitisation
For precision sensor signal digitisation such as load cells, pressure transducers, and strain gauges, the MAX182BCWI offers 12-bit resolution and software calibration that improve effective accuracy beyond the raw 1-LSB quantisation by trimming offset and gain in firmware. The internal 4.096V reference scales directly to engineering units (1 mV/LSB at 0-4.096V full-scale, with the 0-5V range giving 1.22 mV/LSB) and the bipolar +/-5V / +/-10V ranges accommodate bipolar sensor outputs without external level shifting. Designers use the on-chip calibration register to compensate for sensor offset at production and the track-and-hold to acquire fast-changing transducer signals without aperture-time errors.
おすすめ
Medical Monitoring & Diagnostic Equipment
In medical monitoring equipment such as bedside patient monitors and physiological-data acquisition front ends, the MAX182BCWI's low-noise integrated architecture and DC-stable calibration suit ECG, EEG, and respiration channels that need 12-bit dynamic range sampled at rates aligned with the 17 ksps throughput. The integrated reference eliminates a separate noisy LDO from the signal path and the four-channel mux allows simultaneous digitisation of multiple electrode pairs with deterministic SAR latency. Hospital-grade isolation barriers pair naturally with the part's wide-body 28-SOIC, which provides the creepage margins required for patient-applied circuits in IEC 60601-1 designs.
おすすめ
Automotive Sensor Interface Modules
The MAX182BCWI's wide input ranges and 28-SOIC footprint make it well suited to non-safety automotive sensor interface modules reading engine, chassis, or HVAC signals such as MAP sensors, oil-quality probes, and cabin climate transducers. Its 12-bit resolution and software calibration track sensor drift across the -40C to +85C automotive temperature range, and the 17 ksps throughput accommodates 1 ms update loops used in engine management. Although the bare MAX182BCWI is not AEC-Q100 qualified, the pin-compatible MAX182AEWI+ (industrial grade) and software-compatible MAX1300 series provide automotive-grade options in the same PCB footprint.
おすすめ
Battery-Powered Test & Measurement Instrumentation
Bench-top multimeters, portable calibrators, and battery-powered test gear benefit from the MAX182BCWI's combination of integrated signal chain (T/H, MUX, reference), 12-bit resolution, and 17 ksps sampling for measuring transducer and circuit signals. The integrated 4.096V reference simplifies its use as a portable voltage standard with 1 mV/LSB resolution, and the bipolar ranges let handheld units measure both DC polarity signals without relay switching. The wide-body 28-SOIC pins also accept hand-soldered rework on test prototypes, and the on-chip calibration allows field-trim against an external standard to maintain long-term accuracy.
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: MAX182BCWI — 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 | MAX182BCWI+ | MAX182AEWI+ | MAX182BEWI+ | MAX165BCWN |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-SOIC (wide, 0.300") | 28-SOIC (wide, 0.300") - same | 28-SOIC (wide, 0.300") - same | 28-SOIC (wide, 0.300") - same | SOIC-28 (wide) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Input Channels | 4 single-ended / 2 differential | 4 / 2 | 4 / 2 | 4 / 2 | 8 / 4 |
| Sampling Rate | 17 ksps | 17 ksps | 17 ksps | 17 ksps | 12 ksps |
| Internal Reference | 4.096 V internal | 4.096 V internal | 4.096 V internal | 4.096 V internal | 4.096 V internal |
| Input Voltage Range | 0-5V / 0-10V / +/-5V / +/-10V | same | same | same | similar bipolar/unipolar ranges |
| Linearity / Speed Grade | B-grade (standard linearity, standard speed) | B-grade | A-grade (tighter linearity) | B-grade | B-grade |
主な差別化要因
- Integrated 4.096V reference avoids external reference IC on the BOM （vs Discretes (separate MUX + T/H + ADR01 reference))
- Wide input range flexibility in a single part （vs MAX135CWI (single-range 0-5V ADC))
- On-chip calibration register trims offset and gain at production （vs MAX165BCWN (no calibration register))
設計ノート
Bypass VDD and REF pins separately. Place a 10 uF tantalum (or low-ESR ceramic) cap and a 0.1 uF ceramic cap in parallel as close as possible to the IC on each supply pin; this prevents digital switching noise from corrupting the analog reference ladder. Estimated: with 17 ksps throughput and a 5V supply, the part draws a few mA quiescent but the converter slewing can produce fast current transients on VDD - bulk decoupling of at least 10 uF is mandatory.
Use a split ground plane with a single star connection between AGND and DGND located right at the IC. Route all digital signals (D0-D7, RD, WR, CS, INT, CLK, RESET) over the digital side, and keep analog input traces (CH0-CH3, REF) short and direct on the analog side. The 28-SOIC wide-body package's pin spacing makes this layout straightforward - leave at least 3 mm of analog-side copper pour as a guard ring around the analog pins to minimise digital crosstalk.
Do not omit the REFADJ capacitor network - it sets the reference fine-trim and omitting it causes gain error. Likewise, never drive an analog input channel outside its selected range (e.g. 0-5V input when in +/-10V range mode) - this can saturate the input multiplexer. The on-chip calibration register should be exercised at production (write CAL=1 then read the cal result) - skipping this leaves the part with uncorrected offset/gain error that drifts over temperature.
Drive analog inputs with a low-impedance buffer (op-amp with < 100 ohm output impedance at the input bandwidth) to avoid conversion errors caused by the ADC's input switching transients. Estimated: at 17 ksps with 5V full-scale, the part's input presents a switched-capacitor load of a few pF that requires ~1 kohm source impedance or less for full accuracy; a series 20 ohm resistor between op-amp output and the ADC pin improves stability without degrading accuracy.
コンプライアンス情報
The base MAX182BCWI uses legacy lead finish (no '+' suffix); it is not RoHS-compliant. Use the MAX182BCWI+ variant (or higher grades MAX182AEWI+ / MAX182BEWI+) for RoHS-compliant designs. Automotive-grade qualification not available in this family.
