ADS1254E - 24-Bit 4-Channel 20-kSPS ADC | Texas Instruments
부품 번호: ADS1254E ✓ 활성ADS1254E 개요
A delta-sigma ADC is a type of analog-to-digital converter that uses oversampling, digital filtering, and noise shaping to achieve high resolution and wide dynamic range. The ADS1254E belongs to the precision ADC hierarchy and is intended for industrial measurement systems requiring accurate conversion of low-bandwidth analog signals. Its differential inputs are suited to bridge sensors, strain-gauge measurements, and instrumentation-amplifier outputs.
The principal features include a 24-bit conversion word without missing codes, four selectable differential input channels, and a maximum data rate of 20 kSPS. Effective resolution reaches 19 bits at that rate, while 1.8-ppm noise and 15-ppm maximum INL support precision measurements. Separate analog and digital supply domains help isolate sensitive analog circuitry from digital switching and interface loads.
Internally, the device combines a precision delta-sigma conversion stage with programmable digital filtering and a synchronous serial interface. Synchronization permits coordinated sampling when multiple converters must acquire related analog signals. Power-down mode reduces consumption when measurements are not continuously required, while the low-power mode retains the stated 20-kSPS conversion capability.
Typical applications include precision pressure and force measurement, industrial process monitoring, low-frequency data acquisition, laboratory instrumentation, and strain-gauge sensor interfaces. Four differential channels reduce the need for separate converter packages when several sensor outputs must be measured under common control.
PCB design should keep analog input routing short, provide local bypass capacitance at AVDD and DVDD, and use a clean grounding strategy that minimizes converter digital-return current beneath sensitive analog traces. The external reference and input network must also be checked for thermal drift, settling time, and overdrive before choosing component values.
This product page consolidates the verified manufacturer and distributor information, separates confirmed specifications from unavailable parameters, and provides practical guidance for evaluating the ADS1254E and its same-family drop-in alternatives.
드롭인 대체품: ADS1254E — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
ADS1252E
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ADS1253E
✅ 드롭인 ⚠️ 사양 미검증가격 문의
데이터시트 보기 →ADS1255E
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ADS1256E
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ADS1254E 최대 정격 & 전기적 특성
| Converter Type | Delta-sigma ADC |
| 분해능 | 24 bit |
| Maximum Data Rate | 20 kSPS |
| Effective Resolution at 20 kSPS | 19 bit |
| Number of Input Channels | 4 channels |
| Input Configuration | 4 differential inputs |
| Noise Performance | 1.8 ppm |
| Integral Nonlinearity | 15 ppm maximum |
| No Missing Codes | 24-bit no missing codes |
| Supply Architecture | Separate AVDD and DVDD |
| Reference | External reference |
| Low-Power Mode Data Rate | 20 kSPS |
| 동작 온도 범위 | -40 °C to +85 °C |
| 패키지 | SSOP-20 (DBQ) |
| 실장 유형 | Surface mount |
| 핀 수 | 20 pins |
ADS1254E ssop-20 (dbq) 핀 구성 가이드
ADS1254E(ssop-20 (dbq) 패키지)의 핀 구성입니다. 이 아날로그 부품에는 입력, 출력, 전원 공급 핀이 있습니다. 오프셋 널, 보상, 인에이블 핀 구성은 제조사 데이터시트를 참조하십시오. 신호 컨디셔닝 및 증폭기 회로에 이상적입니다.
다음에 대한 상세 핀아웃 데이터 없음: ADS1254E.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
ADS1254E 적합 용도: 6 애플리케이션s: Precision Bridge and Strain-Gauge Measurement, Industrial Process Monitoring, Laboratory Instrumentation, Low-Frequency Data Acquisition, Power and Battery Monitoring, Synchronized Multi-Channel Sensing.
Precision Bridge and Strain-Gauge Measurement
The ADS1254E is well suited to precision bridge measurements because it combines four differential inputs with a nominal 24-bit conversion word and 19-bit effective resolution at 20 kSPS. A bridge or strain-gauge amplifier can drive the selected differential channel while its low-noise 1.8-ppm performance helps preserve small signal detail. The signal path should include an instrumentation amplifier with suitable common-mode range, low-noise excitation, input protection, and anti-alias filtering. Because the four channels share the converter, their sampling is coordinated, which is useful when comparing multiple load cells or sensing bridges. The -40 °C to +85 °C range supports industrial equipment, but reference drift and front-end offset still dominate total error if they are not controlled.
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Industrial Process Monitoring
ADS1254E fits slow industrial process-monitoring loops where pressure, temperature, or level signals require more precision than ordinary low-resolution converters provide. Its four differential channels reduce the number of converter packages needed when several conditioned sensors are acquired together, and the 20-kSPS rate is sufficient for many process variables. A practical implementation uses protected sensor inputs, analog filtering, a stable external reference, and separate AVDD and DVDD filtering. The resulting system can preserve 19-bit effective resolution at the maximum conversion rate. However, channel multiplexing, settling time, sensor bandwidth, and synchronization must be evaluated together. The converter is therefore most useful when process dynamics are slow enough for the selected digital filter and input impedance requirements rather than for high-speed waveform acquisition.
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Laboratory Instrumentation
The ADS1254E can serve as the measurement front end in laboratory instruments that sample low-level analog quantities with high resolution. Its 24-bit nominal conversion, 19-bit effective resolution at 20 kSPS, and 15-ppm maximum INL provide a strong basis for precision source-and-measurement equipment. The device is placed behind buffered, protected analog inputs, with the external reference selected for low drift and adequate noise performance. Serial data can be transferred to an embedded controller for filtering, calibration, and display. Designers should ensure that the input bandwidth and digital-filter delay are appropriate for the measurement, rather than treating the 20-kSPS output rate as unrestricted analog bandwidth. Local reference and analog-ground layout are particularly important when extracting small signals from low-noise sensors.
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Low-Frequency Data Acquisition
ADS1254E is appropriate for compact low-frequency data-acquisition systems that need to capture several analog channels at up to 20 kSPS. Four differential inputs allow the converter to replace multiple single-channel devices, while its separate AVDD and DVDD domains support deliberate analog and digital partitioning. The system designer should select input amplifiers with adequate bandwidth and settling behavior, place bypassing close to the supply pins, and keep sensitive traces away from serial-interface return currents. Synchronization can support repeatable acquisition across multiple converters. The tradeoff is resolution versus speed: effective resolution is 19 bits at 20 kSPS rather than the full nominal 24 bits, and the digital-filter response must be included when defining the usable measurement bandwidth.
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Power and Battery Monitoring
ADS1254E can measure low-bandwidth supply, battery, or energy-monitoring signals when the analog front end scales those voltages into the converter's allowable range. Four differential channels support simultaneous comparison of voltage, current, temperature, or auxiliary telemetry, while the 20-kSPS rate is appropriate for slow supervisory measurements rather than transient capture. A practical design uses high-impedance dividers, a precision reference, and input filtering whose settling behavior agrees with the selected data rate. Low-noise performance of 1.8 ppm helps when small shunt-voltage changes must be resolved. Designers must verify common-mode limits before connecting battery-derived signals, add protection for transient industrial voltages, and avoid treating the ADC's INL as the only error term; reference error, resistor tolerance, leakage, and thermal drift can otherwise dominate the measurement.
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Synchronized Multi-Channel Sensing
ADS1254E is useful when several related analog channels must be sampled under coordinated converter control. Its four differential inputs share one conversion engine, and the documented synchronization feature supports systems that need repeatable timing across converters. The 24-bit nominal resolution and 20-kSPS maximum rate suit low-frequency sensors such as thermocouple amplifiers, pressure transmitters, or multi-axis strain systems. In a multi-converter installation, engineers must define the common trigger, clocking arrangement, settling interval, and filtering sequence to avoid channel-to-channel timing error. The synchronization feature should not be interpreted as a guarantee of identical results across devices without considering clock accuracy, reference matching, analog-front-end response, and digital-filter delay. The external reference and power layout should therefore be engineered as part of the complete measurement chain.
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추천 제품 요약
엔지니어링 참조 데이터: ADS1254E — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ADS1252E | ADS1253E | ADS1255E | ADS1256E |
|---|---|---|---|---|---|
| Package | SSOP-20 (DBQ) | SSOP-20 (DBQ) | SSOP-20 (DBQ) | SSOP-20 (DBQ) | SSOP-20 (DBQ) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
주요 차별점
- Four differential inputs in one converter (vs ADS1256E)
- 20-kSPS maximum conversion rate (vs ADS1253E)
- 19-bit effective resolution at maximum rate (vs ADS1252E)
설계 노트
Separate the analog and digital return paths as early as practical. Place AVDD and DVDD bypass capacitors at their respective supply pins using short traces, route serial-interface signals away from analog inputs, and avoid placing the external reference return current beneath sensitive differential inputs. The verified data confirms separate AVDD and DVDD but does not provide capacitor values or layout drawings, so use the exact values and grounding arrangement shown in the Texas Instruments datasheet Rev. B.
Design the analog front end for the selected 20-kSPS data rate rather than treating the converter's nominal 24-bit resolution as unlimited bandwidth. Include anti-alias filtering and verify amplifier settling time before the converter's sampling instants. Differential routing should use closely matched geometry and a continuous ground reference, while input protection components should have low leakage and capacitance. This is particularly important because the ADC provides 19-bit effective resolution at 20 kSPS, so nonideal front-end behavior can prevent realization of the converter's specified performance.
Do not substitute from the family name or package alone. ADS1252E, ADS1253E, ADS1255E, and ADS1256E are same-family SSOP-20 drop-in candidates, but their conversion rates, channel arrangements, register behavior, and timing can differ from ADS1254E. Before replacing the device, compare the pin descriptions, supply limits, input range, digital-filter characteristics, serial timing, and acquisition sequencing in the applicable manufacturer documentation. The supplied web evidence does not independently verify all of those fields for the alternatives.
규정 준수 정보
The supplied product and distributor snippets do not explicitly state the compliance fields for ADS1254E, so unknown is used rather than assuming qualification. The verified operating-temperature range is -40 °C to +85 °C.
