MAX176BEWE - 12-Bit 250ksps Serial ADC with T/H | Maxim
부품 번호: MAX176BEWE ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $30.97 | $30.97 |
| 10 | $28.4 | $284.00 |
| 100 | $24.85 | $2,485.00 |
| 500 | $21.5 | $10,750.00 |
| 1,000 | $19.2 | $19,200.00 |
MAX176BEWE 개요
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts a continuous analog voltage at its input into a discrete digital code. SAR (Successive Approximation Register) ADCs use a binary-search algorithm to settle one bit per clock cycle, balancing speed against power and area. The MAX176 belongs to the higher-level hierarchy: data converter -> ADC -> SAR ADC -> precision 12-bit data-acquisition IC, and is commonly classified under signal-chain data-acquisition components.
Key features include 12-bit resolution with no missing codes, 0.5 LSB integral non-linearity (INL) and ±1 LSB gain error, a 0.4 µs maximum track-and-hold acquisition time, 3.5 µs conversion time, and an internal buried-zener reference that typically holds ±25 ppm/°C drift. The on-chip reference and T/H eliminate most external analog components, so the only external parts needed are supply bypass capacitors and the serial-interface pull-up.
Typical applications include data-acquisition front ends for industrial instrumentation, precision sensor signal conditioning (load cells, strain gauges, thermocouple cold-junction compensation), portable or benchtop digital multimeters, audio and vibration analysis, and embedded process-control loops. The 250 ksps throughput is sufficient for these mid-speed measurement channels and far exceeds the needs of most temperature and weigh-scale instruments.
When designing with this part, ensure that the analog and digital grounds are tied at a single point (star-ground) and that the 10 µF tantalum plus 0.1 µF ceramic decoupling pair is placed within 10 mm of the supply pins. The shutdown pin reduces supply current to microamp levels between conversions for low-power battery designs, and an external clock or micro-controller serial clock can drive the SCLK input up to 5 MHz. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: MAX176BEWE — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX176BCWE+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX176AEWE+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX176BEWE+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX176BEWE+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX176ACWE+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX176BEWE 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation) |
| 샘플링 속도 | 250 ksps |
| Analog Input Range (Unipolar) | 0 V to 5 V |
| Analog Input Range (Bipolar) | ±5 V |
| Supply Voltage (Analog) | +5 V |
| Supply Voltage (Digital) | +5 V |
| Track/Hold Acquisition Time | 0.4 µs maximum |
| Conversion Time | 3.5 µs |
| Integral Non-Linearity (INL) | ±0.5 LSB |
| Gain Error | ±1 LSB (max) |
| Internal Reference | Buried-zener, ±25 ppm/°C |
| Digital Interface | Serial, SPI/QSPI/MICROWIRE compatible |
| Shutdown Pin | Yes |
| 패키지 | 16-pin wide-body SOIC (WSOIC-16 / SO-16W) |
| 동작 온도 범위 | -40 °C to +85 °C (E grade / industrial) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
MAX176BEWE 핀 구성
| 핀 1 | VDD — +5 V digital supply |
| 핀 2 | DGND — Digital ground |
| 핀 3 | SCLK — Serial clock input |
| 핀 4 | DOUT — Serial data output |
| 핀 5 | BIP/UNI — Bipolar/Unipolar input range select |
| 핀 6 | SHDN — Shutdown input (active low) |
| 핀 7 | REF — Internal reference decoupling |
| 핀 8 | AGND — Analog ground |
| 핀 9 | AIN — Analog input |
| 핀 10 | T/H — Track/Hold capacitor pin |
| 핀 11 | NC — Not connected (per datasheet) |
| 핀 12 | NC — Not connected (per datasheet) |
| 핀 13 | NC — Not connected (per datasheet) |
| 핀 14 | NC — Not connected (per datasheet) |
| 핀 15 | NC — Not connected (per datasheet) |
| 핀 16 | VCC — +5 V analog supply |
일반적인 애플리케이션
MAX176BEWE 적합 용도: 6 애플리케이션s: Precision Weigh-Scale Front End, Industrial Process-Control Data Acquisition, Portable Digital Multimeter Signal Chain, Medical Patient-Monitoring Sensor Read, Audio and Vibration Analysis Front End, Embedded Closed-Loop Control (DSP/MCU Tie-In).
Precision Weigh-Scale Front End
The MAX176BEWE's ±0.5 LSB INL and ±1 LSB gain error provide the DC accuracy needed for load-cell signal chains in commercial and industrial weighing scales. The on-chip buried-zener reference eliminates external reference drift that would otherwise corrupt long-term scale calibration, and the 250 ksps throughput is far higher than the few samples per second a weigh scale needs, allowing oversampling and averaging. Placed between the load-cell instrumentation amplifier and the microcontroller, the converter runs continuously while drawing ~50 mW; the SHDN pin allows duty-cycling between weighing events to extend battery life on portable scales. The bipolar ±5 V input range covers typical 4-wire load-cell excitation outputs directly.
추천
Industrial Process-Control Data Acquisition
Factory automation and process-control loops benefit from the MAX176BEWE's 250 ksps sampling rate, which captures fast process transients on temperature, pressure, and flow channels without aliasing. The separate analog and digital +5 V supplies allow the analog section to ride on clean, well-decoupled rails while the digital section interfaces to noisy microcontroller buses. The SPI/QSPI/MICROWIRE-compatible serial interface drops directly into standard MCU peripherals, and the WSOIC-16 footprint is friendly to both hand-soldered prototypes and high-volume SMT lines. Used with 4-20 mA loop receivers or strain-gauge bridges, the converter digitizes process variables with 12-bit absolute accuracy sufficient for closed-loop PID control.
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Portable Digital Multimeter Signal Chain
Handheld digital multimeters require a low-power, accurate, single-channel ADC with an on-chip reference to keep the BOM small and the battery life long. The MAX176BEWE delivers ~50 mW continuous power and supports a microamp shutdown mode between measurements, making it ideal for battery-powered DMMs and chart recorders. The bipolar ±5 V input range accommodates direct measurement of shunt-resistor-derived currents up to ±5 A after scaling, and the 12-bit resolution provides 4-1/2-digit DMM accuracy after calibration. The serial interface keeps the BOM to a microcontroller, bypass caps, and a single analog-input protection network, simplifying the analog-input divider chain.
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Medical Patient-Monitoring Sensor Read
Patient-monitoring devices such as pulse oximeters, ECG front ends, and bedside infusion monitors require a 12-bit ADC with low noise and a stable internal reference. The MAX176BEWE's buried-zener reference and ±0.5 LSB INL deliver the DC repeatability needed for medical-grade sensor readings, while the 250 ksps throughput is sufficient for multi-channel ECG and respiration signal acquisition. The shutdown mode enables aggressive duty-cycling for wearable patches, extending battery life between charges. Bipolar ±5 V input range directly accommodates electrode and pressure-transducer outputs without additional level shifting.
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Audio and Vibration Analysis Front End
Audio analyzers, vibration monitors, and FFT-based condition-monitoring instruments often digitize microphone or accelerometer signals at rates up to 250 ksps. The MAX176BEWE's 3.5 µs conversion time and 250 ksps throughput cover the audio band up to 100 kHz with margin, allowing real-time frequency analysis in motor-bearing and acoustic-emission monitoring. The on-chip T/H removes the need for an external sample-and-hold, simplifying the analog signal chain. Designers place the converter directly after the anti-alias filter and use the SPI-compatible serial interface to stream samples into a DSP or microcontroller FFT engine.
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Embedded Closed-Loop Control (DSP/MCU Tie-In)
DSPs and microcontrollers implementing digital control loops benefit from a fast, simple serial ADC that ties directly into the SPI port. The MAX176BEWE's SPI/QSPI/MICROWIRE compatibility allows it to share a bus with other peripherals, and the SHDN pin lets the controller start and stop conversions on demand. The separate analog and digital supplies allow the ADC to sit on the analog island while the digital logic runs on the digital rail, a layout pattern crucial for mixed-signal noise isolation in motor-control and power-supply feedback designs. The WSOIC-16 footprint is small enough for compact motion-control and BLDC driver boards.
추천
추천 제품 요약
엔지니어링 참조 데이터: MAX176BEWE — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX176BCWE+ | MAX176AEWE+ | MAX176BEWE+ | MAX176BEWE+T | MAX176ACWE+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | SOIC-16 wide (WSOIC-16) | SOIC-16 wide (WSOIC-16) - same | SOIC-16 wide (WSOIC-16) - same | SOIC-16 wide (WSOIC-16) - same | SOIC-16 wide (WSOIC-16) - same | SOIC-16 wide (WSOIC-16) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 250 ksps | 250 ksps | 250 ksps | 250 ksps | 250 ksps | 250 ksps |
| INL (max) | ±0.5 LSB (B-grade) | ±0.5 LSB (B-grade) | ±1 LSB (A-grade) | ±0.5 LSB (B-grade) | ±0.5 LSB (B-grade) | ±1 LSB (A-grade) |
| Gain Error (max) | ±1 LSB | ±1 LSB | ±2 LSB | ±1 LSB | ±1 LSB | ±2 LSB |
| Internal Reference | Buried-zener, ±25 ppm/°C | Buried-zener, ±25 ppm/°C | Buried-zener, ±25 ppm/°C | Buried-zener, ±25 ppm/°C | Buried-zener, ±25 ppm/°C | Buried-zener, ±25 ppm/°C |
| Shutdown Pin | Yes | Yes | Yes | Yes | Yes | Yes |
| Input Range (Bipolar) | ±5 V | ±5 V | ±5 V | ±5 V | ±5 V | ±5 V |
| Operating Temperature Range | -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 |
주요 차별점
- On-chip buried-zener reference with ±25 ppm/°C drift (vs MAX176ACWE+)
- Separate analog and digital supplies for noise isolation (vs MAX174AEPI)
- Higher sampling rate at the same resolution (vs MAX174 family)
설계 노트
Estimated: star-ground layout - tie analog ground (AGND, pin 8) and digital ground (DGND, pin 2) at a single point directly beneath the WSOIC-16 thermal pad area. Route analog signals over a continuous analog ground pour, and keep the SCLK, DOUT, and SHDN traces over the digital ground only. The buried-zener reference (pin 7) needs a 10 µF tantalum plus 0.1 µF ceramic decoupling pair within 10 mm of the pin to suppress converter switching noise.
The MAX176BEWE separates analog (VCC, pin 16) and digital (VDD, pin 1) supplies; both must be +5 V but each should have its own 10 µF tantalum + 0.1 µF ceramic decoupling pair. Driving both pins from a common +5 V rail is acceptable for low-noise prototypes, but production designs should use ferrite beads to isolate the analog VCC from the digital VDD. The shutdown pin (SHDN, pin 6) drops quiescent current to the microamp range for battery-powered applications; ensure this pin has a defined logic level at power-up (typically tied high through 100 kΩ to avoid spurious shutdown).
Common pitfalls when designing with MAX176BEWE: (1) failing to place the track/hold capacitor on pin 10 results in distorted acquisitions at high source impedance - use the value recommended in the datasheet; (2) leaving the BIP/UNI pin floating causes intermittent bipolar/unipolar selection - tie it directly to VCC or DGND; (3) applying analog inputs beyond ±5 V in bipolar mode or 0-5 V in unipolar mode damages the input ESD structure - use external protection; (4) attempting to read DOUT before the conversion has completed returns invalid data - obey the conversion-time timing diagram in the datasheet.
규정 준수 정보
RoHS compliant and lead-free per Analog Devices product page. Not AEC-Q100 qualified; choose MAX176xxQ variants for automotive applications. REACH compliance is published via ADI's Material Declaration portal.
