MAX195BEWE - 16-Bit 85ksps SAR ADC | Maxim Integrated
部品番号: MAX195BEWE ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $58.95 | $58.95 |
| 10 | $53.5 | $535.00 |
| 100 | $48.2 | $4,820.00 |
| 500 | $42.75 | $21,375.00 |
| 1,000 | $38.4 | $38,400.00 |
MAX195BEWE 概要
An SAR ADC is a precision data converter that performs a binary search against an internal capacitive DAC, one bit per clock cycle, to settle a sampled analog input to within half an LSB of the reference. The MAX195 architecture places this conversion loop behind a high-impedance input track/hold and an auto-calibration engine that nulls offset and linearity errors on power-up, eliminating the factory trim or external adjustment steps required by older successive-approximation parts. SAR ADCs such as the MAX195 are widely used in industrial process control, weigh scales, data-acquisition front ends, and precision instrumentation because they offer deterministic latency, intrinsic anti-alias behavior, and no pipeline delay compared with delta-sigma ADCs.
Key features include a serial data interface (compatible with SPI/QSPI/MICROWIRE), separate AV DD and DV DD supplies that minimize digital-noise coupling into the analog path, and an integrated calibration engine that holds full 16-bit performance across the -40 °C to +85 °C industrial temperature range. According to the Maxim datasheet, the MAX195 achieves 85 ksps throughput while drawing only 36 mW (typical, ±5 V supplies), with shutdown reducing supply current to 10 µA. Internal calibration corrects linearity and offset on every power-up, so no external trim components are required.
Typical applications include precision weigh scales, multi-channel data-acquisition systems, portable medical instruments, industrial process-control loops, and battery-powered sensor signal chains. The pin-selectable input range and small WSOIC-16 footprint simplify PCB layout in space-constrained designs. This page synthesizes distributor stock, drop-in alternatives, and design notes that complement the manufacturer datasheet without repeating it verbatim.
ドロップイン代替品: MAX195BEWE — 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: MAX195BEWE （同一形状・フットプリント） — 相違点: Package, Architecture, Input Type, Resolution, Operating Temperature.
クイック比較ツール — 並列比較する代替部品を選択:
MAX195BCWE
✅ ドロップイン✓ 在庫あり
$32.4 / 個
データシートを見る →MAX195BEWE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX195BEWE+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX195BEPE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX195BCPE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX195BEWE 最大定格＆電気的特性
| 分解能 | 16 bit |
| Architecture | SAR (Successive Approximation Register) |
| サンプリングレート | 85 ksps |
| Number of Channels | 1 |
| Input Type | Single-Ended, Pseudo-Differential |
| 入力電圧範囲 | 0 V to VREF (unipolar) or ±VREF (bipolar, pin-selectable) |
| External Reference Voltage | up to +5 V |
| Supply Voltage (Analog) | ±5 V (typ) |
| Supply Voltage (Digital) | +5 V |
| Supply Current (Active) | 36 mW (typ) |
| シャットダウン電流 | 10 µA |
| Data Interface | Serial (SPI/QSPI/MICROWIRE-compatible) |
| Integral Non-Linearity (INL) | ±1 LSB max (B-grade) |
| 動作温度 | -40 °C to +85 °C |
| パッケージ | 16-pin WSOIC (wide SOIC) |
| 実装タイプ | Surface Mount |
| Internal Calibration | Yes (auto on power-up) |
| RoHS ステータス | Compliant (MAX195BEWE+ variant) |
MAX195BEWE ピン構成
| ピン 1 | AIN — Analog input (single-ended or positive pseudo-differential) |
| ピン 2 | AIN- — Analog input return (negative pseudo-differential) |
| ピン 3 | REF — External reference voltage input (up to +5 V) |
| ピン 4 | AVDD — Analog +5 V supply |
| ピン 5 | AGND — Analog ground |
| ピン 6 | DGND — Digital ground |
| ピン 7 | DVDD — Digital +5 V supply |
| ピン 8 | SHDN — Shutdown (active low; 10 µA Iq when low) |
| ピン 9 | CS — Chip select (active low) |
| ピン 10 | DOUT — Serial data output (SPI-compatible) |
| ピン 11 | SCLK — Serial clock input |
| ピン 12 | BP/UP — Bipolar / Unipolar input range select |
| ピン 13 | CAL — Calibration control (per datasheet) |
| ピン 14 | NC — Not connected (per datasheet) |
| ピン 15 | NC — Not connected (per datasheet) |
| ピン 16 | NC — Not connected (per datasheet) |
主な用途
MAX195BEWE の用途: 6 件s: Precision Weigh Scales, Industrial Process-Control Loops, Portable Medical Instruments, Multi-Channel Data Acquisition Systems, Battery-Powered Sensor Signal Chains, Audio Bandwidth Measurement Equipment.
Precision Weigh Scales
The MAX195BEWE's 16-bit resolution and ±1 LSB INL (B-grade) provide the dynamic range and linearity needed for 4-wire load-cell signal conditioning in industrial weigh scales. Its pseudo-differential input accepts the bridge output directly, while the external reference up to +5 V lets designers use a precision low-drift reference such as the MAX6126 to set full-scale to the load cell's calibrated excitation. The 85 ksps throughput oversamples slowly-varying weight signals, suppressing 50/60 Hz line noise through simple averaging. The 10 µA shutdown mode enables battery-powered portable scales to idle between readings, extending field runtime by orders of magnitude versus always-on designs.
おすすめ
Industrial Process-Control Loops
In 4-20 mA current-loop and process-variable monitoring systems, the MAX195BEWE's pin-selectable unipolar/bipolar input ranges map directly to sensor outputs from thermocouples, RTDs, and pressure transducers without external level shifting. The 85 ksps sampling rate is more than adequate for closed-loop control bandwidths below 1 kHz, while the SAR architecture's deterministic conversion latency simplifies PID loop timing calculations. Separate AV DD and DV DD supplies let designers isolate noisy 24 V back-plane rails from the analog signal chain. Industrial-grade -40 °C to +85 °C operation allows deployment in unheated factory cabinets.
おすすめ
Portable Medical Instruments
Patient-monitoring devices such as spot-check vital-signs monitors, bedside pulse oximeters, and ambulatory ECG Holter recorders benefit from the MAX195BEWE's combination of 16-bit precision, low 36 mW active dissipation, and 10 µA shutdown current. The serial SPI-compatible output reduces PCB routing compared with parallel-output ADCs, freeing board space for optocouplers and isolation barriers required by IEC 60601-1. Pin-selectable bipolar inputs accept biopotential signals directly from instrumentation amplifiers. Battery-life extension through duty-cycled shutdown is critical for handheld designs targeting 8+ hour continuous use on a single Li-ion cell.
おすすめ
Multi-Channel Data Acquisition Systems
Modular DAQ cards for PCI/USB-based test and measurement use the MAX195BEWE as the per-channel precision digitizer, with external analog multiplexers (such as the MAX306) channeling multiple sensors into the single ADC input. The SAR architecture's lack of pipeline delay means commands and conversions remain tightly synchronized, which is essential when sequencing measurements across many input channels. Designers stack multiple MAX195BEWE devices when higher aggregate throughput is needed, each driven by a common SPI clock and chip-select. The 16-pin WSOIC package fits cleanly on standard 100 x 100 mm Eurocard DAQ form factors.
おすすめ
Battery-Powered Sensor Signal Chains
Wireless sensor nodes for IoT, environmental monitoring, and structural-health monitoring rely on the MAX195BEWE's 10 µA shutdown current to achieve multi-year battery life. The internal auto-calibration engine eliminates the need for periodic field recalibration, which would otherwise require duty-cycling the ADC and burning power. The wide reference voltage range accepts low-voltage ratiometric references from bridge sensors powered directly from the battery rail, maximizing usable dynamic range at low cell voltages. Combined with a low-power MCU, the design fits within the energy budget of a single CR2032 coin cell for periodic sampling duty cycles below 0.1%.
おすすめ
Audio Bandwidth Measurement Equipment
Bench-top audio analyzers, distortion analyzers, and acoustic measurement microphones require 16-bit resolution at sample rates compatible with the full audio bandwidth. The MAX195BEWE's 85 ksps throughput is sufficient for audio-band signals up to ~40 kHz when paired with appropriate anti-alias filtering, and its low total harmonic distortion preserves measurement accuracy at small signal levels. The external reference can be a precision audio-band reference such as the MAX6126, ensuring that measurement gain remains stable over temperature. Bipolar input support lets the part directly digitize AC-coupled audio without additional DC biasing circuitry.
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: MAX195BEWE — 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 | MAX195BCWE | MAX195BEWE+ | MAX195BEWE+T | MAX195BEPE+ | MAX195BCPE+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) |
| Package | 16-pin WSOIC | 16-pin WSOIC | 16-pin WSOIC | 16-pin WSOIC | PDIP-16 (through-hole) | PDIP-16 (through-hole) |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 85 ksps | 85 ksps | 85 ksps | 85 ksps | 85 ksps | 85 ksps |
| INL (max) | ±1 LSB | ±0.5 LSB (upgraded grade) | ±1 LSB | ±1 LSB | ±1 LSB | ±0.5 LSB (upgraded grade) |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Shutdown Current | 10 µA | 10 µA | 10 µA | 10 µA | 10 µA | 10 µA |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT | SMD/SMT | Through Hole | Through Hole |
| RoHS Compliance | Non-compliant (no '+' suffix) | Varies by suffix | RoHS-compliant (lead-free) | RoHS-compliant (lead-free) | RoHS-compliant (lead-free) | RoHS-compliant (lead-free) |
主な差別化要因
- Higher-linearity BC-grade variant exists in identical package （vs MAX195BCWE)
- Modern lead-free RoHS-compliant variant in identical package （vs MAX195BEWE+)
- 10 µA shutdown mode enables battery-powered designs （vs AD574A (legacy 12-bit parallel ADC))
設計ノート
The MAX195BEWE accepts separate AV DD (±5 V analog) and DV DD (+5 V digital) supplies, and Maxim recommends tying AV DD and the +5 V analog rail together at the PCB while powering DV DD from the noisy digital rail. Decouple both pins with 10 µF tantalum in parallel with 0.1 µF ceramic placed within 5 mm of the supply pins. Place the ferrite bead between the analog and digital +5 V planes to break ground-loop noise coupling. Estimated: total quiescent current at ±5 V is ~7 mA analog plus ~1 mA digital, totaling 36 mW.
Route the analog input traces as a guarded differential pair from the sensor or front-end op-amp to the AIN and AIN- pins. Keep digital traces (CS, DOUT, SCLK) at least 5 mm away from AIN and REF, and place a ground pour under the analog section of the IC. The REF pin is high-impedance; bypass it with a 10 µF tantalum in parallel with 0.1 µF ceramic, located within 3 mm of the pin. Use a star-ground topology with the analog ground tied to the digital ground at a single point near the AGND pin to avoid digital return currents flowing through the analog ground.
Do not drive AIN beyond AV DD + 0.3 V or below AGND - 0.3 V; over-voltage can permanently damage the input ESD structure. Always issue a calibration cycle after power-up by toggling CAL before the first conversion, otherwise linearity will exceed the datasheet specification. For bipolar input range, ensure AIN- is biased to mid-reference, not ground, otherwise negative excursions will be clipped. The shutdown pin is level-sensitive; do not leave it floating - tie it high through a 100 kΩ pull-up if hardware shutdown is unused.
The MAX195BEWE's serial interface runs at up to several MHz; keep SCLK traces short and series-terminate with 33 Ω at the driver if the cable/trace exceeds 50 mm. Place a small ferrite bead on the SCLK line near the IC if the source is shared with another high-speed digital signal. The DOUT line should be source-terminated only if it drives a long cable; on-PCB traces generally do not require termination. If multiple MAX195 devices share an SPI bus, dedicate a chip-select line to each and ensure no two CS lines are simultaneously low.
コンプライアンス情報
The MAX195BEWE (no '+' suffix) is the standard RoHS-transition-era variant. The MAX195BEWE+ is the lead-free RoHS-compliant version currently shipping. Per Maxim Integrated product page, this part family is not AEC-Q100 qualified (industrial grade only).
