MAX873ACSA - 2.5V Precision Voltage Reference, ±0.06%, 10mA | Maxim
부품 번호: MAX873ACSA ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.61 | $261.00 |
| 500 | $2.25 | $1,125.00 |
| 1,000 | $1.95 | $1,950.00 |
MAX873ACSA 개요
A voltage reference is a specialized analog IC that maintains a precisely known, temperature-stable output voltage regardless of supply variations, load changes, or temperature shifts. Voltage references occupy the bottom of the power-management hierarchy: they sit below general voltage regulators and LDOs in the signal chain, but above raw supply rails in accuracy. They are essential building blocks in data-conversion systems, precision measurement equipment, and any application where the absolute accuracy of an analog-to-digital or digital-to-analog converter is determined by the stability of its reference voltage.
Key features of the MAX873ACSA include 4.5V to 18V (or higher, per datasheet) supply range, low supply current of typically under 1mA, excellent line and load regulation, and a buried-zener architecture that delivers low noise and stable temperature performance. The MAX873 variant operates from a guaranteed +4.5V supply, while the MAX875 operates from +8V and the MAX876 from +11V, allowing designers to choose the lowest-voltage compatible part for each system. The 'CSA' suffix denotes the commercial-temperature 8-pin SOIC package.
Typical applications include 12-bit to 16-bit ADC reference inputs, precision DMMs, industrial process-control transducers, and digital-panel meters where the absolute accuracy of the reading depends directly on reference stability. The MAX873ACSA's 10mA sink/source capability also makes it suitable for driving multiple converter reference pins in parallel.
When designing with this part, place a 0.1µF to 1µF decoupling capacitor close to the supply pin and a larger output capacitor (1µF to 10µF) on the output to ensure stability. Avoid pulling the output far below ground through external loads, and respect the maximum supply voltage rating to prevent permanent damage. Reference ICs are sensitive to board stress and layout - mount on a mechanically stable area.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the standalone manufacturer datasheet - giving procurement engineers and designers a single decision-ready reference for sourcing the MAX873ACSA.
드롭인 대체품: MAX873ACSA — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX873ACSA+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX873ACSA-T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX873AESA
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MAX873AEPA
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADR01ARZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADR02ARZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX873ACSA 사양
| 출력 유형 | Fixed Series Voltage Reference |
| Nominal Output Voltage | 2.5 V |
| Initial Accuracy (Tolerance) | ±0.06 % |
| Output Current (Source/Sink) | 10 mA |
| Supply Voltage Range | +4.5 V to +18 V |
| Temperature Coefficient | max ±15 ppm/°C |
| 동작 온도 범위 | 0 °C to +70 °C (Commercial) |
| 패키지 | 8-pin SOIC (CSA) |
| 실장 유형 | Surface Mount |
| Architecture | Buried-Zener with On-Chip Op-Amp Buffer |
| RoHS 상태 | Compliant |
| MSL 레벨 | 1 |
| Family Cross-Reference | MAX873 (2.5 V) / MAX875 (5 V) / MAX876 (10 V) |
MAX873ACSA 핀 구성
| 핀 1 | VOUT — Reference output (+2.5 V) |
| 핀 2 | NC — No connection (per datasheet) |
| 핀 3 | NC — No connection (per datasheet) |
| 핀 4 | GND — Ground |
| 핀 5 | TRIM — Output voltage trim input (optional) |
| 핀 6 | NC — No connection (per datasheet) |
| 핀 7 | NC — No connection (per datasheet) |
| 핀 8 | VIN — Supply voltage (+4.5 V to +18 V) |
일반적인 애플리케이션
MAX873ACSA 적합 용도: 6 애플리케이션s: 12-Bit to 16-Bit ADC Reference Input, Digital Panel Meter & Digital Multimeter (DMM), Industrial Process Control Transducer Signal Conditioning, Data Acquisition Systems (DAQ) Reference Rail, Precision Voltage-to-Current / 4-20mA Loop Transmitter, Digital-to-Analog Converter (DAC) Reference Input.
12-Bit to 16-Bit ADC Reference Input
The MAX873ACSA's +2.5V fixed output and ±0.06% accuracy (about ±1.5mV) provide an ideal reference rail for 12-bit to 14-bit successive-approximation ADCs such as the AD7667 and AD7606 family. With ±15ppm/°C temperature coefficient across 0°C to +70°C, the part contributes less than ±0.05% error over the commercial range, well within the 1-LSB budget of a 14-bit converter at a 2.5V full-scale. Designers place the reference between the analog supply and the ADC's REF pin, adding a 1µF to 10µF output capacitor to absorb the dynamic current pulses of the converter's internal switching capacitor DAC.
추천
Digital Panel Meter & Digital Multimeter (DMM)
Handheld DMMs and panel meters demand a stable, low-drift reference for accurate AC and DC voltage readings. The MAX873ACSA delivers 2.5V ±0.06% with ±15ppm/°C drift, supporting 3½-digit to 4½-digit meters where the absolute accuracy of the reference defines the meter's specified accuracy. The 10mA output current is sufficient to drive the reference pin of an ICL7106/ICL7109 ADC chip directly. Its low supply current extends battery life in portable meters, and the 8-pin SOIC package simplifies integration into compact handheld form factors.
추천
Industrial Process Control Transducer Signal Conditioning
Process-control transducers (load cells, pressure sensors, strain gauges) rely on a precise excitation or reference voltage to translate microvolt-level signals into usable ADC codes. The MAX873ACSA provides a stable 2.5V rail that, after resistive scaling, can drive a load-cell bridge at 5V with sub-millivolt repeatability. With ±15ppm/°C drift and a commercial temperature range, the part keeps the calibration valid across the industrial environment. Designers typically buffer the reference with a precision op-amp such as the AD8628 to deliver the milliamps required by the bridge.
추천
Data Acquisition Systems (DAQ) Reference Rail
In multi-channel data-acquisition boards, a single reference IC often feeds several ADCs simultaneously. The MAX873ACSA delivers up to 10mA, sufficient to source the reference pin of up to four 14-bit SAR ADCs without a buffer. Its 2.5V output pairs naturally with 5V supply rails that feed ADCs accepting a 2.5V reference. The 8-pin SOIC and low quiescent current make the part unobtrusive in dense, multi-layer DAQ layouts where board area and thermal budget are limited.
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Precision Voltage-to-Current / 4-20mA Loop Transmitter
The MAX873ACSA can serve as the precision excitation for 4-20mA loop transmitters where the absolute accuracy of the output current must be maintained across temperature. After a precision op-amp converts the 2.5V reference to a current set-point, the loop output accuracy is bounded by the reference's drift. The ±15ppm/°C coefficient translates to better than 0.05% over the industrial range, well within the 0.1% typical industrial-process accuracy budget. Designers use this topology for smart industrial sensors that must communicate reliably over long field wiring.
추천
Digital-to-Analog Converter (DAC) Reference Input
The output accuracy of any multiplying DAC or precision voltage-output DAC is bounded by the stability of its reference input. The MAX873ACSA's ±0.06% initial accuracy and ±15ppm/°C drift establish the floor for the DAC's integral non-linearity (INL). With 2.5V output it pairs directly with 12-bit DACs such as the AD5620 (LFCSP) and 14-bit DACs such as the AD5640, both of which accept 2.5V reference inputs. Adding a 4.7µF tantalum and 0.1µF ceramic decoupling network on the reference output suppresses switching noise from the DAC's internal ladder.
추천
추천 제품 요약
엔지니어링 참조 데이터: MAX873ACSA — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX873ACSA+ | MAX873ACSA-T | MAX873AEPA | ADR02ARZ | ADR01ARZ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Analog Devices | Analog Devices |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Output Voltage | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 5.0 V | 10.0 V |
| Initial Accuracy | ±0.06 % | ±0.06 % | ±0.06 % | ±0.06 % | ±0.06 % | ±0.05 % |
| Temperature Coefficient | ±15 ppm/°C max | ±15 ppm/°C max | ±15 ppm/°C max | ±15 ppm/°C max | ±3 ppm/°C max | ±3 ppm/°C max |
| Supply Voltage Range | +4.5 V to +18 V | +4.5 V to +18 V | +4.5 V to +18 V | +4.5 V to +18 V | +7 V to +36 V | +12 V to +36 V |
| Output Current | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA |
| Operating Temperature | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Automotive Grade | No | No | No | No | No | No |
주요 차별점
- Lowest supply-voltage precision 2.5V reference in its class (vs MAX875 (5V) / MAX876 (10V))
- Buried-zener architecture for low noise and high stability (vs ADR02ARZ (bandgap reference))
- 10 mA output drives multiple ADC references without buffer (vs MAX6150 (5 mA output))
설계 노트
Estimated: at VIN=5V and zero load, the MAX873ACSA dissipates roughly 5 mW (1 mA × 5 V). Under 10 mA full-load, dissipation climbs to about 50 mW. The 8-SOIC package is rated for roughly 170 °C/W θJA on a JEDEC 1-oz 4-layer board, giving a junction-temperature rise under 9 °C at full load - well within safe limits. Designers should still keep the part away from heat sources.
Place a 1 µF to 10 µF tantalum (or low-ESR ceramic) decoupling capacitor on the output pin, no further than 5 mm from the IC package, and a 0.1 µF ceramic bypass on the supply pin. The output capacitor is critical: it absorbs transient load-current steps from the ADC's internal capacitor-DAC switching and stabilizes the loop. Keep PCB trace lengths short to minimize parasitic inductance, which can resonate with the capacitor at high frequency.
Do not exceed the absolute maximum supply voltage (typically +20 V on the MAX873 family) - transients above this level can permanently damage the buried-zener reference. Do not reverse the supply polarity; the part lacks reverse-battery protection. Do not allow the output pin to be pulled below ground by external loads - the substrate diode will forward-conduct and disturb the reference. Always check the trim pin configuration in the datasheet before connecting external trim resistors.
Reference ICs are sensitive to PCB stress and thermal gradients; place the part away from board edges, mounting screws, and heat sinks that can introduce mechanical strain. Avoid routing high-current switching signals under the reference or its output capacitor - the resulting ground bounce can couple into the output and degrade ADC code noise. For best 0.1 Hz to 10 Hz noise performance, use surface-mount ceramic output capacitors rather than electrolytic, which can leak.
규정 준수 정보
RoHS and REACH compliance per Maxim Integrated product page. The MAX873ACSA itself is commercial-grade temperature; the MAX873AESA / MAX873AEPA variants are required for industrial extended temperature applications. The MAX873 family is not AEC-Q100 qualified for automotive use.
