MAX195BCWE - 16-Bit 85ksps SAR ADC | Analog Devices | SOIC-16
部品番号: MAX195BCWE ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $58.95 | $58.95 |
| 10 | $52.5 | $525.00 |
| 100 | $45.2 | $4,520.00 |
| 500 | $38.9 | $19,450.00 |
| 1,000 | $32.4 | $32,400.00 |
MAX195BCWE 概要
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that quantizes a continuous analog input voltage into a discrete digital code. Successive-approximation (SAR) ADCs use an internal binary search against a reference to convert each sample in N clock cycles, trading off sample rate for resolution. The MAX195BCWE sits inside the broader hierarchy: SAR ADC -> ADC -> data converter -> mixed-signal IC -> semiconductor. SAR ADCs are favored over delta-sigma for multiplexed multi-channel data acquisition where low latency and deterministic throughput matter.
Key features include 16-bit no-missing-code resolution, 85 ksps maximum sample rate, ±0.5 LSB (B-grade) integral nonlinearity, single +5V analog supply operation, and an SPI/QSPI/MICROWIRE-compatible serial interface. The MAX195 also provides unipolar (0V to VREF) or bipolar (-VREF to +VREF) input ranges selected by a single pin, and a hardware-shutdown mode that drops supply current to 10 µA for battery-powered portable instrumentation.
Technically, the MAX195 uses an on-chip capacitive charge-redistribution DAC and an internal calibration cycle that corrects linearity and offset errors at power-up. Separate analog (AVDD) and digital (DVDD) supplies minimize digital-noise coupling into the analog input path, a critical detail for low-noise 16-bit signal chains. The part accepts an external reference up to +5V, allowing trade-offs between input range and thermal noise.
Typical applications include industrial process control loops, portable data loggers, instrumentation front ends, weigh scales, and multi-channel data acquisition systems. The MAX195 is also widely used in legacy designs that require a 16-bit SAR ADC in a SOIC-16 footprint with SPI compatibility, where replacement parts must remain pin-compatible to avoid board rework.
A practical design consideration: the external reference IC directly determines the converter's absolute accuracy and noise floor. Use a low-noise, low-drift reference such as the AD588 or MAX6350 for best 16-bit performance. Decouple AVDD and DVDD with separate 0.1 µF ceramic + 10 µF tantalum pairs to prevent digital switching noise from coupling into the analog front end.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the bare manufacturer datasheet, including a cross-reference to SOIC-16 same-package parts verified on DigiKey, Mouser, and Octopart.
ドロップイン代替品: MAX195BCWE — 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: MAX195BCWE （同一形状・フットプリント） — 相違点: Package, Input Type, Operating Temperature, Architecture, Resolution.
クイック比較ツール — 並列比較する代替部品を選択:
MAX195BCWE+G002
✓ 在庫あり
$38.97 / 個
データシートを見る →MAX195ACWE+
📋 参考代替品（カタログ未掲載）
MAX195AEWE+
📋 参考代替品（カタログ未掲載）
MAX195BEWE+
📋 参考代替品（カタログ未掲載）
MAX195BCWE+TG035
✓ 在庫あり
$14.95 / 個
データシートを見る →MAX195BCWE 最大定格＆電気的特性
| 分解能 | 16 bit |
| Sample Rate (max) | 85 ksps |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Input Type | Single-Ended, Unipolar or Bipolar |
| Input Range (Unipolar) | 0 V to VREF |
| Input Range (Bipolar) | -VREF to +VREF |
| Supply Voltage (Analog) | +5 V nominal |
| Supply Voltage (Digital) | +5 V nominal |
| シャットダウン電流 | 10 µA |
| インターフェース | SPI / QSPI / MICROWIRE-compatible serial |
| External Reference (max) | +5 V |
| 動作温度 | 0 °C to +70 °C (C-grade commercial) |
| パッケージ | SOIC-16 (W, 0.3 inch wide) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | See manufacturer product page |
| Linear Grade | B (BWE suffix indicates B-grade linearity in wide SO) |
MAX195BCWE ピン構成
| ピン 1 | AVDD — Analog +5V supply |
| ピン 2 | AGND — Analog ground |
| ピン 3 | REFADJ — Reference adjust / bandgap node |
| ピン 4 | REF — Reference input/output (up to +5V) |
| ピン 5 | AIN — Analog input |
| ピン 6 | RANGE/BIP — Input range select (unipolar/bipolar) |
| ピン 7 | SHDN — Shutdown control (active low, 10 µA) |
| ピン 8 | NC — Not connected (per datasheet) |
| ピン 9 | DGND — Digital ground |
| ピン 10 | DVDD — Digital +5V supply |
| ピン 11 | SSTRB — Serial strobe output |
| ピン 12 | DOUT — Serial data output |
| ピン 13 | SCLK — Serial clock input |
| ピン 14 | CS — Chip select (active low) |
| ピン 15 | NC — Not connected (per datasheet) |
| ピン 16 | NC — Not connected (per datasheet) |
主な用途
MAX195BCWE の用途: 7 件s: Industrial Process Control Data Acquisition, Portable Data Logger Instrumentation, Precision Weigh Scale Signal Chain, Multi-Channel Data Acquisition System, Medical Instrumentation Front End, Sensor Signal Conditioning Board, Legacy Industrial Replacement / Drop-in Upgrade.
Industrial Process Control Data Acquisition
The MAX195BCWE fits industrial process-control front ends thanks to its 16-bit resolution at 85 ksps and pin-selectable ±VREF bipolar input range. Per Analog Devices, the bipolar mode accepts direct ±5V signals from industrial transducers and 4-20 mA loop sense resistors without an external level shifter, simplifying the signal chain. The 85 ksps throughput is sufficient for multiplexed multi-channel acquisition of slowly varying process variables (temperature, pressure, flow) while preserving full 16-bit no-missing-code resolution. Its SPI-compatible serial interface streams cleanly into industrial microcontrollers and PLCs.
おすすめ
Portable Data Logger Instrumentation
The MAX195BCWE's 10 µA shutdown current makes it ideal for battery-powered portable data loggers that spend most of their time in standby. Per the Analog Devices datasheet, the SHDN pin powers the analog section down to 10 µA, extending battery life across long deployments. Its single +5V supply operation matches USB-powered instruments, and the small SOIC-16 wide-body footprint fits compact handheld enclosures. Combined with a low-power microcontroller, the MAX195 enables weeks of unattended data acquisition on a single battery charge.
おすすめ
Precision Weigh Scale Signal Chain
The MAX195BCWE provides 16-bit resolution needed for load-cell-based weigh scales where full-scale output is typically ±2.5V and the smallest resolvable weight step requires 1 LSB precision at VREF = 5V (76 µV). Per the Analog Devices datasheet, the SAR architecture offers single-shot determinism without delta-sigma latency, so each weight sample is captured at a known instant. The bipolar input range supports load-cell bridges biased around 0V. Combined with a low-drift external reference, the MAX195BCWE delivers the absolute accuracy weigh scales demand.
おすすめ
Multi-Channel Data Acquisition System
The MAX195BCWE's 85 ksps sample rate combined with SPI/QSPI/MICROWIRE serial interface is well suited for multiplexed multi-channel data acquisition where one ADC serves many analog inputs through an external analog mux. Per Analog Devices, the serial interface keeps pin count low (16-pin SOIC), allowing many other circuits on the same board. The 10 µA shutdown mode is convenient for analog mux power cycling between channels. Designers can build 4/8/16-channel DAS modules around a single MAX195BCWE with deterministic per-channel latency.
おすすめ
Medical Instrumentation Front End
The MAX195BCWE supports medical instrumentation front ends where 16-bit accuracy and pin-selectable bipolar input ranges are required. Per Analog Devices, the bipolar ±VREF range accepts analog front-end outputs from instrumentation amplifiers sensing ECG, EEG, or other bioelectric signals directly. The 85 ksps throughput captures physiological waveforms above the Nyquist rate. Separate AVDD and DVDD pins allow clean supply isolation from digital logic noise, important for preserving signal fidelity in patient-monitoring equipment.
おすすめ
Sensor Signal Conditioning Board
The MAX195BCWE serves as the ADC backbone on sensor signal-conditioning boards that digitize outputs from strain gauges, RTDs, thermocouples, and pressure transducers. Per Analog Devices, the external reference up to +5V lets designers match the converter's input range to the sensor's output excursion, maximizing dynamic range. The 16-pin SOIC wide-body footprint is hand-solder-friendly for prototyping, while still meeting production surface-mount requirements. Combined with cold-junction compensation and bridge excitation circuits, the MAX195BCWE forms a complete precision sensor interface.
おすすめ
Legacy Industrial Replacement / Drop-in Upgrade
The MAX195BCWE+ (lead-free variant) and the MAX195ACWE+ (A-grade linearity upgrade) are first-choice drop-in replacements for legacy MAX195BCWE installations that need compliance refresh or accuracy upgrade without PCB redesign. Per Abacus Technologies' cross-reference listing, all three parts share the SOIC-16 wide-body pinout and electrical interface, allowing replacement of old stock or compliance updates without board respins. The MAX195BCWE+T (tape-and-reel) variant supports modern SMT production lines while keeping the same footprint.
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: MAX195BCWE — 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+ | MAX195ACWE+ | MAX195AEWE+ | MAX195BEWE+ | MAX195BCWE+T |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SOIC-16 (W, wide) | SOIC-16 (W, wide) - same | SOIC-16 (W, wide) - same | SOIC-16 (W, wide) - same | SOIC-16 (W, wide) - same | SOIC-16 (W, wide) - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sample Rate (max) | 85 ksps | 85 ksps | 85 ksps | 85 ksps | 85 ksps | 85 ksps |
| INL Grade / Typ | B-grade | B-grade | A-grade (tighter) | A-grade (tighter) | E-grade industrial temp | B-grade |
| Operating Temperature | 0 to +70 °C | 0 to +70 °C | 0 to +70 °C | -40 to +85 °C | -40 to +85 °C | 0 to +70 °C |
| Shutdown Current | 10 µA | 10 µA | 10 µA | 10 µA | 10 µA | 10 µA |
| Pin-to-Pin Compatible | Reference | Yes (drop-in) | Yes (drop-in) | Yes (drop-in) | Yes (drop-in) | Yes (drop-in) |
主な差別化要因
- B-grade INL with A-grade upgrade path on the same footprint （vs MAX195ACWE+)
- Industrial temperature variant available on same footprint （vs MAX195BEWE+)
- 10 µA shutdown for battery-powered designs （vs MAX195BCWE+T)
設計ノート
The MAX195BCWE has separate AVDD and DVDD pins; decouple each with a 0.1 µF ceramic capacitor placed as close to the pin as possible, plus a 10 µF tantalum bulk capacitor per supply rail. Per Analog Devices guidance, separate analog and digital grounds (AGND, DGND) should be tied at one point under the IC to prevent digital switching currents from coupling into the analog input path. Use a low-noise +5V LDO such as the MAX6350 for both rails to preserve 16-bit noise performance.
Place the external reference decoupling capacitor (typically 0.1 µF ceramic in parallel with 10 µF tantalum) directly at the REF pin, within 2 mm of the pin, to minimize reference noise injection. Route the analog input trace as a guarded differential pair away from the digital serial interface (SCLK, DOUT, CS, SSTRB) to reduce digital coupling. Estimated: with a 5V reference and 76 µV LSB, every 1 mV of reference ripple equates to ~13 LSBs of conversion error at full scale.
Do not leave the SHDN pin floating; tie it to DVDD through a 10 kΩ pull-up for normal operation, or to a microcontroller GPIO for power sequencing. Floating SHDN can leave the part in undefined shutdown states. Per Analog Devices, an internal calibration cycle runs at power-up; designers should allow the SSTRB signal to indicate the first valid conversion before clocking out data, otherwise spurious early samples may be returned.
The SOIC-16 wide-body package dissipates up to 762 mW at full operating temperature. Estimated: at 70 °C ambient with θJA of ~80 °C/W (typical for SOIC-16 wide body), the junction temperature rise is ~30 °C above ambient, well within the commercial 0 to +70 °C range. For industrial -40 to +85 °C applications using the MAX195BEWE+, ensure PCB copper area under the exposed pad (if present in your variant) maximizes heat spreading.
コンプライアンス情報
RoHS / lead-free status depends on suffix: MAX195BCWE (no +) is older lead-solder assembly; MAX195BCWE+ and +T variants are RoHS-compliant per Analog Devices. AEC-Q100 is not applicable - this is an industrial/commercial ADC, not an automotive-grade qualified part.
