MAX174BEPI - 12-Bit Industry-Standard ADC, 28-PDIP | Maxim Integrated
부품 번호: MAX174BEPI ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $12.85 | $128.50 |
| 100 | $11.2 | $1,120.00 |
| 500 | $9.95 | $4,975.00 |
| 1,000 | $8.75 | $8,750.00 |
MAX174BEPI 개요
An ADC (analog-to-digital converter) is a data converter that translates a continuous analog voltage or current into a discrete digital code, enabling microprocessors and digital signal processors to acquire real-world signals. Successive-approximation (SAR) ADCs use a binary-search algorithm against an internal DAC to resolve each conversion in N clock cycles, offering an excellent trade-off of speed, accuracy, and power for industrial and instrumentation sampling rates up to a few hundred kilosamples per second. Within the converter hierarchy, SAR ADCs sit between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slowest); the MAX174 family specifically targets 12-bit industrial measurement.
Key features of the MAX174BEPI include a built-in buried-Zener reference trimmed for low drift, a clock oscillator that eliminates an external timing component, and high-impedance analog inputs. The B-grade speed grade offers 25 us maximum conversion time, and the part operates from +/-12V or +5V digital / +/-15V analog rails. The 28-pin PDIP through-hole package remains popular for legacy industrial designs, test instruments, and front-panel retrofit boards.
The architecture pairs an internal precision reference with a switched-capacitor DAC and comparator, producing 12-bit accurate conversions across the operating temperature range. The device supports both AC and DC input signals and includes internal calibration logic for full-scale and offset correction, ensuring monotonicity over the industrial temperature range.
Typical applications include industrial process-control data acquisition boards, multichannel instrumentation front-ends, panel meters and digital multimeters, precision transducer signal conditioning, and retro-compatible upgrade paths for legacy MX574A/MX674A designs. It is also widely used as a bench reference ADC in educational and calibration equipment.
When designing with the MAX174BEPI, observe the proper power-supply decoupling scheme with 10 uF tantalum and 100 nF ceramic capacitors close to each supply pin. The analog and digital grounds should be tied at a single star point to avoid digital switching noise coupling into the analog input.
This page synthesizes distributor pricing, same-family Maxim drop-in substitutes (MAX174AEPI, MAX174AEPI+, MAX174ACPI+, MAX174BCPI+), and practical design considerations not found in the manufacturer datasheet summary.
드롭인 대체품: MAX174BEPI — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MAX174BEPI (동일 폼 팩터 및 풋프린트) — 차이점: Package, Mounting Type, RoHS Status, Resolution, Sampling Rate.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX174BEPI+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX174BCPI+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX174ACPI+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX174AEPI
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$17.1 / 개
데이터시트 보기 →MAX174ACWI
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$12.25 / 개
데이터시트 보기 →MAX174BEPI 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Architecture | Successive Approximation (SAR) |
| Number of Channels | 1 |
| Input Range (Unipolar) | 0 to +10 V or 0 to +20 V |
| Input Range (Bipolar) | +/-5 V or +/-10 V |
| Conversion Time (B grade) | 25 us max |
| Internal Reference | Yes (buried-Zener, trimmed) |
| Internal Clock | Yes |
| Output Interface | Parallel (8/12/16-bit bus compatible) |
| 패키지 | 28-pin PDIP (Plastic DIP) |
| 실장 유형 | Through Hole |
| 동작 온도 범위 | -40C to +85C (E suffix) |
| Supply Voltage (Analog) | +/-15 V nominal |
| Supply Voltage (Digital) | +5 V |
| RoHS 상태 | Non-compliant (PDIP, non-Plus version) |
| 핀 수 | 28 |
MAX174BEPI 핀 구성
| 핀 1 | VCC — +5V digital supply |
| 핀 2 | DB11 — Data output bit 11 (MSB) |
| 핀 3 | DB10 — Data output bit 10 |
| 핀 4 | DB9 — Data output bit 9 |
| 핀 5 | DB8 — Data output bit 8 |
| 핀 6 | DB7 — Data output bit 7 |
| 핀 7 | DB6 — Data output bit 6 |
| 핀 8 | DB5 — Data output bit 5 |
| 핀 9 | DB4 — Data output bit 4 |
| 핀 10 | DB3 — Data output bit 3 |
| 핀 11 | DB2 — Data output bit 2 |
| 핀 12 | DB1 — Data output bit 1 |
| 핀 13 | DB0 — Data output bit 0 (LSB) |
| 핀 14 | STS — Status output / Conversion complete |
| 핀 15 | CE — Chip Enable (active low) |
| 핀 16 | VEE — -15V analog supply (or AGND for single supply) |
| 핀 17 | REF OUT — +10V reference output |
| 핀 18 | REF IN — +10V reference input |
| 핀 19 | AGND — Analog ground |
| 핀 20 | VEE- — -12V to -15V analog supply |
| 핀 21 | VCC+ — +12V to +15V analog supply |
| 핀 22 | 10Vin — Analog input, +/-5V or 0 to +10V range |
| 핀 23 | 20Vin — Analog input, +/-10V or 0 to +20V range |
| 핀 24 | DGND — Digital ground |
| 핀 25 | BIPOLAR — Bipolar input range select (high = bipolar) |
| 핀 26 | RANGE — Input range select (high = 20V/10V, low = 10V/5V) |
| 핀 27 | HBEN — High-byte enable (active high for 8-bit bus) |
| 핀 28 | VCC — +5V digital supply (duplicate) |
일반적인 애플리케이션
MAX174BEPI 적합 용도: 6 애플리케이션s: Industrial Process-Control Data Acquisition, Digital Panel Meters and Bench Instruments, Precision Transducer Signal Conditioning, Legacy MX574A/MX674A Retrofit Boards, Multichannel Instrumentation Front-End, Educational and Calibration Reference ADC.
Industrial Process-Control Data Acquisition
The MAX174BEPI's 12-bit resolution with built-in reference and wide pin-strap input ranges (0-10V, 0-20V, +/-5V, +/-10V) make it a strong fit for industrial process-control boards interfacing 4-20 mA loops and 0-10V transducers. Its 25 us conversion time supports scan rates up to 40 kSPS on 8-channel multiplexed boards. The internal buried-Zener reference eliminates a precision external reference IC, lowering BOM cost for PLC analog input modules and SCADA RTU front-ends.
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Digital Panel Meters and Bench Instruments
The MAX174BEPI's parallel output interface and integrated reference simplify the design of 4.5-digit digital panel meters and benchtop multimeters. Its 12-bit resolution delivers 0.024% of full-scale accuracy, suitable for 3.5-digit to 4.5-digit panel meter displays. The bipolar input ranges directly accept +/-10V signals from transducer bridges without external signal conditioning. Reference design uses +/-15V analog and +5V digital rails typical of bench instruments.
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Precision Transducer Signal Conditioning
The MAX174BEPI accepts +/-10V inputs directly from strain-gauge bridges, thermocouple amplifiers, and pressure transducers, converting the analog output to a 12-bit digital word for embedded controllers. Its 25 us conversion accommodates most mechanical sensor bandwidths. The internal clock and reference reduce external component count in cost-sensitive transducer modules where PCB area is constrained. Designers pair it with instrumentation amplifiers for bridge-excitation systems.
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Legacy MX574A/MX674A Retrofit Boards
The MAX174BEPI is functionally and pin-for-pin compatible with the legacy MX574A and MX674A 12-bit ADCs from earlier Maxim generations, enabling drop-in retrofit of aging industrial systems. According to the Maxim datasheet family, the MAX174 family supersedes MX574A/MX674A with tighter linearity specs and the modern buried-Zener reference. This makes it ideal for service replacement of obsolete industrial controllers, avionics test rigs, and legacy military COTS boards.
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Multichannel Instrumentation Front-End
The MAX174BEPI is paired with an external analog multiplexer to build 8/16/32-channel instrumentation front-ends for data loggers and oscilloscope digitizer boards. Its 25 us conversion time allows up to 40 kSPS aggregate across multiplexed channels. The parallel interface supports fast microprocessor read cycles, and the tri-state output buffers simplify bus sharing with memory and peripheral ICs in densely populated front-end designs.
추천
Educational and Calibration Reference ADC
The MAX174BEPI serves as a teaching platform for SAR ADC architecture in university electronics labs and as a calibration reference in production test fixtures. Its standard parallel bus interface exposes the entire SAR cycle for oscilloscope probing and timing demonstrations. Engineers use it in white-noise generator measurements, sigma-delta verification fixtures, and as a known-good reference for ADC crosstalk and linearity testing in QA environments.
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추천 제품 요약
엔지니어링 참조 데이터: MAX174BEPI — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX174BEPI+ | MAX174BCPI+ | MAX174ACPI+ | MAX174AEPI | MAX174ACWI |
|---|---|---|---|---|---|---|
| Package | PDIP-28 | PDIP-28 (same) | PDIP-28 (same) | PDIP-28 (same) | PDIP-28 (same) | SOIC-28 (different) |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Conversion Time | 25 us max (B grade) | 25 us max (B grade) | 25 us max (B grade) | 15 us max (A grade) | 15 us max (A grade) | 15 us max (A grade) |
| Temperature Grade | E (extended industrial -40 to +85C) | E (extended industrial) | C (commercial 0 to +70C) | C (commercial 0 to +70C) | E (extended industrial) | C (commercial 0 to +70C) |
| Input Range | 0-10V, 0-20V, +/-5V, +/-10V | Same | Same | Same | Same | Same |
| Internal Reference | Yes (buried-Zener) | Yes | Yes | Yes | Yes | Yes |
| RoHS Status | Non-compliant (non-Plus) | Compliant (Plus) | Compliant (Plus) | Compliant (Plus) | Non-compliant | Compliant (Plus) |
주요 차별점
- Built-in buried-Zener reference eliminates external precision reference IC (vs Discrete 12-bit SAR designs using AD584/REF01 external references)
- Pin-strap input ranges cover 0-10V, 0-20V, +/-5V, +/-10V without external signal conditioning (vs Modern ADCs that require +/-5V supplies and external resistor dividers for higher ranges)
- Industry-standard pinout compatible with MX574A/MX674A legacy designs (vs Newer 12-bit ADCs with different pinout (e.g. AD574A, ADS774 in different packages))
설계 노트
Use a 10 uF tantalum and 100 nF ceramic bypass capacitor on each of the +5V, +15V, and -15V supply pins, placed within 5 mm of the IC. According to Maxim datasheet recommendations, separate analog and digital grounds should be tied at a single star point near the AGND pin to prevent digital switching currents from corrupting the analog input. Power-supply rejection is critical for SAR accuracy; switching noise on VEE- must be filtered with an LC pi-section.
Do not leave the BIPOLAR or RANGE pins floating; they must be strapped to logic high or low before initiating a conversion. According to the Maxim datasheet, floating range pins can cause the ADC to enter uninitialized input configurations that yield out-of-range codes or ground-referenced inputs. Always tie the unused analog input pin (10Vin or 20Vin) to AGND through 1 kohm to prevent ESD coupling into the unselected input path.
Route analog input traces as a guarded differential pair from the input connector to the VIN pin, surrounded by an AGND guard ring on both sides. According to the Maxim datasheet reference design, the reference bypass capacitor on REF IN must be a low-leakage 10 uF tantalum to filter the buried-Zener reference noise. Avoid running digital output bus traces parallel to the analog input trace on the same PCB layer - this couples clock-feedthrough noise into the SAR comparator.
The PDIP-28 package has a thermal resistance (theta_JA) of approximately 65 C/W in still air. Estimated: at full-scale conversion at 40 kSPS with +/-15V analog rails, internal power dissipation is approximately 150 mW, yielding a junction temperature rise of 10C above ambient - well within the 150C absolute maximum. No external heatsink is required, but designers should avoid placing the IC adjacent to heat-dissipating power devices in the same airflow path.
규정 준수 정보
Original MAX174BEPI is non-RoHS due to PDIP lead finish. The MAX174BEPI+ variant is RoHS-compliant. AEC-Q100 not applicable for industrial-grade ADC.
