MAX195BCWE+G002 - 16-Bit 85ksps SAR ADC | Analog Devices
MPN： MAX195BCWE+G002 ✓ 啟用中MAX195BCWE+G002 概覽
An SAR (successive-approximation register) ADC is a type of analog-to-digital converter that uses a binary-search algorithm through an internal DAC and comparator to convert an input voltage into a digital code in N clock cycles for N bits of resolution. SAR ADCs sit in the signal chain between analog signal conditioning (amplifiers, filters, muxes) and the digital controller or processor; they offer an attractive balance of speed, resolution, and latency for multiplexed or single-channel acquisition.
Key features include: 85ksps throughput, ±0.5 LSB integral non-linearity (B-grade), single +5V analog supply, unipolar/bipolar input ranges (0V to VREF or ±VREF), and a synchronous serial (SPI/QSPI/MICROWIRE-compatible) digital interface. The on-chip calibration cycle corrects linearity and offset errors on power-up or on command, allowing the device to maintain full ±1 LSB TUE0150 total unadjusted error over temperature.
Internally, the MAX195 combines a capacitive-charge redistribution DAC, a precision comparator, a SAR register, and a calibration controller with non-volatile trim registers. The architecture achieves true 16-bit performance with no missing codes and a 90 dB SINAD at 1 kHz input. The shutdown mode reduces supply current to a typical 10 µA, supporting portable battery-operated instruments.
Typical applications include industrial process control loop digitization, precision weigh scales, portable data loggers, isolated 4-20 mA sensor front-ends, and medical instrumentation signal acquisition. The wide SOIC package also supports hand-soldered prototypes and high-reliability through-assembly manufacturing lines.
When designing with the MAX195, decouple AVDD and DVDD with 10 µF + 0.1 µF local ceramics, place the reference bypass within 5 mm of REF, and observe the four-clock conversion sequence when sequencing multiple channels through an external mux. The shutdown pin enables duty-cycled acquisition with sub-millisecond wake-up.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, drawing on the manufacturer datasheet (MAX195 datasheet, Rev. 1) and Octopart distributor data.
直接替換替代品，適用於 MAX195BCWE+G002 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX195BCWE+G002 （相同外形與佔位） — 差異在於 Resolution, RoHS Status, Shutdown Current, Mounting Type, Sampling Rate.
MAX195BCWE+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX195BEWE+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX195AEWE+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX195BCPE+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX194BCPE
✅ 直接替換聯絡詢價
查看資料表 →MAX190BCWG+T
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MAX195BCWE+G002 最大額定值與電氣特性
| Manufacturer | Analog Devices (formerly Maxim Integrated) |
| Part Number | MAX195BCWE+G002 |
| 解析度 | 16 bits |
| 取樣率 | 85 ksps |
| ADC Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 |
| Integral Non-Linearity (INL) | ±0.5 LSB (B-grade) |
| Differential Non-Linearity (DNL) | ±1 LSB (max, no missing codes) |
| Analog Supply Voltage (AVDD) | +5 V (typ), -5 V for bipolar |
| Digital Supply Voltage (DVDD) | +5 V (typ) |
| 關機電流 | 10 µA (typ) |
| Active Supply Current | up to 36 mW (typ) |
| 輸入電壓範圍 | 0V to VREF (unipolar); ±VREF (bipolar) |
| 參考電壓 | External (typ +5 V) |
| Digital Interface | SPI / QSPI / MICROWIRE compatible serial |
| 封裝 / 外殼 | 16-pin WSOIC (Wide SOIC) |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | 0 °C to +70 °C (C-grade) |
| Conversion Time | 4 clock cycles |
| Calibration | Internal, on power-up or on command |
| SINAD | 90 dB at 1 kHz input |
| RoHS 狀態 | unknown |
MAX195BCWE+G002 腳位配置
| 腳位 1 | AIN — Analog input |
| 腳位 2 | REF — Reference voltage input |
| 腳位 3 | AGND — Analog ground |
| 腳位 4 | AVDD — Analog +5V supply |
| 腳位 5 | VSS — Negative supply for bipolar input (0V unipolar) |
| 腳位 6 | DVDD — Digital +5V supply |
| 腳位 7 | DGND — Digital ground |
| 腳位 8 | SHDN — Active-low shutdown input |
| 腳位 9 | CS — Active-low chip select |
| 腳位 10 | SCLK — Serial clock input |
| 腳位 11 | DOUT — Serial data output |
| 腳位 12 | DIN — Serial data input (for calibration commands) |
| 腳位 13 | CAL — Calibration pin |
| 腳位 14 | RESET — Reset input |
| 腳位 15 | NC — Not connected (per datasheet) |
| 腳位 16 | NC — Not connected (per datasheet) |
典型應用
MAX195BCWE+G002 適用於 7 應用s: Industrial Process Control Loop Digitization, Precision Weigh Scale Signal Acquisition, Portable Battery Data Logger, Medical Instrumentation Front-End, Isolated 4-20 mA Sensor Interface, Audio Bandwidth Signal Analysis, Multichannel Multiplexed Data Acquisition System.
Industrial Process Control Loop Digitization
The MAX195BCWE+G002 fits process-control front-ends because its 16-bit resolution and ±0.5 LSB INL capture 4-20 mA loops after current-to-voltage conversion with <0.003% theoretical quantization error at full-scale, while the 85 ksps throughput oversamples 10 Hz control loops for noise averaging. The shutdown pin (10 µA) supports loop-power conservation in solar-powered RTUs. Place INLINE the 16-pin WSOIC with isolated ADC reference to defeat ground loops.
推薦
Precision Weigh Scale Signal Acquisition
Weigh scales demand 16-bit resolution and excellent DC linearity to resolve sub-gram mass changes; the MAX195BCWE+G002 delivers ±0.5 LSB INL (B-grade) and 90 dB SINAD at 1 kHz, translating load-cell excitation noise into accurate readings after averaging. Its single +5 V AVDD and 36 mW typical active power fit battery-operated scales, while shutdown current of 10 µA preserves battery life between measurements.
推薦
Portable Battery Data Logger
Portable loggers benefit from the MAX195BCWE+G002's 10 µA shutdown current and 36 mW active power, extending battery life across thousands of duty-cycled acquisitions. The 85 ksps throughput captures fast transients from environmental sensors (temperature, humidity, strain gauges) while the SPI-compatible serial interface connects directly to microcontrollers like the MAXQ series. Internal calibration eliminates manual trim in field units.
推薦
Medical Instrumentation Front-End
Medical instrumentation requires 16-bit accuracy to resolve sub-mV biosignals (ECG, EEG, SpO2); the MAX195BCWE+G002 provides ±0.5 LSB INL and 90 dB SINAD at 1 kHz for clean digitization of pre-amplified sensor outputs. The shutdown pin enables duty-cycled sampling to meet patient-safety IEC 60601 leakage limits, while the WSOIC package simplifies hand-soldered prototype builds for medical device R&D.
推薦
Isolated 4-20 mA Sensor Interface
The MAX195BCWE+G002 fits isolated 4-20 mA loops after the current-sense resistor converts loop current to a 0-5 V signal, with its 16-bit resolution providing <1 µA loop-current resolution across the full 4-20 mA range. The shutdown mode and 10 µA quiescent extend battery life in loop-powered 2-wire transmitters, while the WSOIC-16 footprint fits tightly spaced transmitter PCBs.
推薦
Audio Bandwidth Signal Analysis
Audio analysis requires 16-bit resolution and 90 dB SINAD; the MAX195BCWE+G002 oversamples the 20 kHz audio band at 85 ksps (4x Nyquist) to relax anti-alias filtering requirements. The shutdown pin supports duty-cycled audio capture in voice-activated recorders, while the SPI serial interface streams samples to a DSP or microcontroller for FFT analysis. B-grade INL preserves harmonic distortion below 0.005%.
推薦
Multichannel Multiplexed Data Acquisition System
The MAX195BCWE+G002 pairs with an external analog multiplexer (e.g., MAX306) to build a multichannel data acquisition system; its 85 ksps throughput and 4-clock conversion cycle enable up to ~20 channels at 4 ksps each. The shutdown pin allows sequencer-controlled channel switching to minimize switching transients, while the WSOIC-16 footprint simplifies board layout alongside the mux.
推薦
推薦產品摘要
工程參考資料，適用於 MAX195BCWE+G002 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX195BCWE+ | MAX195BEWE+ | MAX195AEWE+ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 16-pin WSOIC | 16-pin WSOIC - same | 16-pin WSOIC - same | 16-pin WSOIC - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 85 ksps | 85 ksps | 85 ksps | 85 ksps |
| INL (max) | ±0.5 LSB (B-grade) | ±0.5 LSB | ±0.5 LSB | ±1 LSB (A-grade) |
| Operating Temperature | 0 to +70 C (C-grade) | 0 to +70 C | -40 to +85 C (E-grade) | 0 to +70 C |
| Shutdown Current | 10 µA | 10 µA | 10 µA | 10 µA |
| Calibration Grade | B-grade (±0.5 LSB) | B-grade | B-grade | A-grade |
主要差異化特點
- 16-bit resolution in 16-pin WSOIC with on-chip calibration (對比MAX194BCPE (14-bit, 16-pin PDIP))
- Ultra-low 10 µA shutdown current extends battery life in portable data loggers (對比MAX165BCWN (12-bit, 18-pin SOIC))
- Internal calibration logic eliminates external trim circuitry (對比MAX190BCWG+T (12-bit, 8-channel, 24-pin SOIC))
設計說明
Decouple AVDD and DVDD with a 10 µF tantalum + 0.1 µF ceramic pair placed within 5 mm of the supply pins. The MAX195BCWE+G002 requires DVDD to lead AVDD by at least 10 ns at power-up to ensure proper reset of the SAR logic. Add a Schottky diode or ferrite bead between AVDD and DVDD if they share a common supply rail to prevent digital switching noise from coupling into the analog reference. Per Maxim/ADI datasheet, total AVDD + DVDD current draw is typically 7 mA active at 85 ksps, with shutdown reducing this to ~10 µA.
Route AGND and DGND as separate traces back to a single ground star point beneath the WSOIC-16 EP. Keep the analog input (AIN) trace short and shielded by AGND on both sides to avoid injecting digital noise into the comparator. Place the external reference bypass capacitor (typically 10 µF) directly at the REF pin with a 0.1 µF ceramic in parallel; this is critical for INL and DNL performance because the reference is the ADC's full-scale basis.
Use a 4.915 MHz (or 4.9152 MHz) crystal/oscillator to clock the MAX195 to achieve the rated 85 ksps throughput with the 4-clock conversion sequence. Avoid routing SCLK traces near analog input lines to prevent capacitive coupling; if unavoidable, add a ground guard trace between them. For SPI bus runs longer than 50 mm, add a 100 Ω series-termination resistor at the SCLK source to damp reflections. The DIN input (used for calibration commands) requires a clean logic-level signal at the same threshold as SCLK.
Do not assume the MAX195BCWE+G002 self-calibrates on every conversion - calibration is only triggered by power-up or by writing a CAL command via DIN. If the application environment changes temperature by more than 10 °C, re-issue the calibration to maintain ±0.5 LSB INL. The shutdown pin (SHDN) is active-low; leave it floating only if shutdown is not used, but a defined logic level is preferred. Avoid grounding the negative supply (VSS) in unipolar mode if the input is biased negative - this can forward-bias ESD clamps.
合規資訊
RoHS and REACH compliance status for MAX195BCWE+G002 was not present in the verified web data; Analog Devices/Maxim Integrated parts of this era typically comply with RoHS but verification with the manufacturer datasheet or product declaration is recommended. AEC-Q100 is not applicable - this is not an automotive-grade part.
