LTC2451ITS8#TRMPBF - 16-Bit ΔΣ ADC, I2C, TSOT-23-8 | ADI
부품 번호: LTC2451ITS8#TRMPBF ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $5.1 | $5.10 |
| 10 | $4.59 | $45.90 |
| 100 | $4.08 | $408.00 |
| 500 | $3.67 | $1,835.00 |
| 1,000 | $3.26 | $3,260.00 |
LTC2451ITS8#TRMPBF 개요
A delta-sigma ADC (also written ΔΣ ADC, sigma-delta ADC, or oversampling noise-shaping converter) is a type of analog-to-digital converter that uses high oversampling followed by digital decimation and noise shaping to achieve very high effective resolution at low bandwidths. The architecture trades input bandwidth for noise-free resolution, making ΔΣ ADCs the dominant choice for precision DC and low-frequency measurement in instrumentation, sensors, and battery monitoring. Within the data-converter hierarchy, the LTC2451 belongs to the precision-ADC family, which sits between high-speed successive-approximation (SAR) ADCs (>1 MSPS) and high-resolution integrating ADCs (>20 bits).
Key features of the LTC2451 include integrated I2C addressing, a low quiescent supply current, an automatic shutdown between conversions that minimizes average power, and excellent DC accuracy (no missing codes at 16 bits). The TSOT-23-8 footprint occupies only 3 mm × 2 mm of PCB area, making the device one of the smallest precision ADCs available and an excellent fit for space-constrained sensor-interface applications.
The device communicates via I2C with factory-programmable slave addresses selected by the I2C device address part suffix, enabling multiple LTC2451 devices on a single bus. Common-mode input range includes ground, allowing true zero-volt measurement in single-supply systems. The internal oscillator and digital filter settle a single conversion in approximately 16.6 ms without external components.
Typical applications include portable instrumentation, weigh scales, direct temperature measurement with bridge sensors, gas and flow metering, isolated sensor front ends, battery monitors, and any precision microcontroller-based system that requires compact, low-power ADC functionality with a digital I2C bus.
When designing with the LTC2451, place the decoupling capacitor as close as possible to the VDD pin and keep analog and digital ground returns short and joined at a single point to preserve noise-free 16-bit performance. The I2C lines should be pulled up to VDD with 2.2 kΩ to 10 kΩ resistors depending on bus speed and capacitance.
This page synthesizes distributor pricing, verified drop-in alternatives, parametric comparisons, and practical design guidance that goes beyond a single datasheet reading, intended for engineers validating the LTC2451ITS8#TRMPBF for new designs or maintenance of existing single-supply precision-ADC subsystems.
드롭인 대체품: LTC2451ITS8#TRMPBF — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC2451ITS8#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2451CDDB#TRMPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2453ITS8#TRMPBF
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LTC2452ITS8#TRMPBF
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LTC2400ITS8#TRMPBF
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LTC2420ITS8#TRMPBF
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LTC2451ITS8#TRMPBF 최대 정격 & 전기적 특성
| Manufacturer | Analog Devices Inc. (formerly Linear Technology) |
| Part Number | LTC2451ITS8#TRMPBF |
| Converter Type | Delta-Sigma (Σ-Δ) ADC |
| 분해능 | 16 bits (no missing codes) |
| Number of Channels | 1 (single-ended) |
| Input Type | Single-ended analog input |
| Supply Voltage (VDD) | 2.7 V to 5.5 V single supply |
| Digital Interface | I2C (2-wire, factory-programmable address) |
| Output Data Rate | 60 samples/sec (single conversion mode) |
| Conversion Time | Approximately 16.6 ms typical |
| Input Range | 0 V to VDD (true ground-referenced) |
| Internal Oscillator | Yes (no external clock required) |
| Automatic Sleep Between Conversions | Yes (low average current) |
| 패키지 | TSOT-23-8 (3 mm × 2 mm) |
| 동작 온도 범위 | -40 °C to +85 °C (Industrial) |
| Screening Level | Industrial |
| Lead / Finish | Lead-free (Pb-free) |
| Compliance | RoHS compliant |
| 실장 유형 | Surface Mount |
LTC2451ITS8#TRMPBF 핀 구성
| 핀 1 | SCL — I2C serial clock input |
| 핀 2 | NC — Not connected (per datasheet) |
| 핀 3 | SDA — I2C serial data (bidirectional) |
| 핀 4 | GND — Ground |
| 핀 5 | IN+ — Analog input (single-ended, 0 V to VDD) |
| 핀 6 | IN- — Analog input return (tie to GND for single-ended) |
| 핀 7 | NC — Not connected (per datasheet) |
| 핀 8 | VDD — Positive supply voltage (2.7 V to 5.5 V) |
일반적인 애플리케이션
LTC2451ITS8#TRMPBF 적합 용도: 6 애플리케이션s: Portable Weigh-Scale Signal Chain, Direct Temperature Sensor Digitization, Isolated Sensor Front-End, Battery Monitoring and Coulomb Counting, Industrial Gas and Flow Metering, Portable Medical Diagnostic Devices.
Portable Weigh-Scale Signal Chain
The LTC2451ITS8#TRMPBF's 16-bit no-missing-codes resolution and 0 V to VDD true-ground-referenced single-ended input make it an excellent ADC for direct bridge/load-cell readout in battery-powered weigh scales. With a 60 Hz output rate, the converter synchronously digitizes the slowly varying bridge output at rates that exceed typical mechanical settling times, eliminating motion-induced aliasing. Its tiny 3 mm × 2 mm TSOT-23-8 footprint and ~200 µA average supply current (thanks to automatic shutdown between conversions) make the part ideal for compact, battery-friendly scales weighing 50–500 g.
추천
Direct Temperature Sensor Digitization
The LTC2451ITS8#TRMPBF is well matched to digitize low-bandwidth analog temperature signals such as those from thermocouple pre-amplifiers, RTD bridge outputs, or precision thermistor dividers. Its 16-bit resolution (≈0.0008 % of full scale) corresponds to ~0.025 °C resolution when digitizing a 1 mV/°C thermocouple output over a 250 mV input range, and its integrated oscillator plus automatic shutdown minimize quiescent drain. The single 2.7–5.5 V supply lets it share the same rail as the host microcontroller, simplifying analog design.
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Isolated Sensor Front-End
The LTC2451ITS8#TRMPBF's small TSOT-23-8 package fits inside the tight PCB area near an isolated sensor (e.g., voltage or current probe), where the ADC's output is sent across an isolator (digital isolator or optocoupler) to the host controller. Because the I2C bus is two-wire, the isolator count is low (typically two channels), keeping BOM cost and isolation creepage feasible. The 16-bit resolution captures sensor full-scale information without the noise floor of a 12-bit ADC, while the 2.7–5.5 V supply fits the side-fed isolated bias rail.
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Battery Monitoring and Coulomb Counting
The LTC2451ITS8#TRMPBF's 2.7–5.5 V supply permits direct connection across a single Li-ion cell (3.0–4.2 V), and its true-ground-referenced input allows measurement of the cell voltage while the cell is being loaded or charged. With 16-bit resolution, the ADC can resolve ~0.2 mV out of a 4.2 V full-scale, which is sufficient for State-of-Charge (SOC) estimation in lithium battery packs. The automatic shutdown feature reduces the ADC's average drain to single-digit microamps during idle periods, important for long-shelf-life battery monitors.
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Industrial Gas and Flow Metering
The LTC2451ITS8#TRMPBF is well suited to industrial gas and flow meters where the analog signal from a flow sensor or pressure transducer changes slowly (typically <10 Hz). The converter's 16-bit resolution allows precise metering even when the analog front-end operates at very low differential signals, while the integrated I2C interface allows the ADC to share a bus with other sensors (e.g., temperature compensation). The industrial -40 °C to +85 °C temperature rating supports outdoor and factory-floor installations.
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Portable Medical Diagnostic Devices
The LTC2451ITS8#TRMPBF's combination of small package size (3 × 2 mm), low average power, and 16-bit precision is well matched to portable medical instruments such as blood-glucose meters, pulse-oximeters, and handheld analyzers. These devices digitize low-frequency bioelectric signals and require precise DC measurement with minimal board space; the I2C interface integrates with common microcontrollers like STM32 and EFM32. The industrial temperature rating ensures stable operation across body-temperature and ambient ranges.
추천
추천 제품 요약
엔지니어링 참조 데이터: LTC2451ITS8#TRMPBF — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2451ITS8#TRPBF | LTC2453ITS8#TRMPBF | LTC2452ITS8#TRMPBF | LTC2400ITS8#TRMPBF | LTC2420ITS8#TRMPBF |
|---|---|---|---|---|---|---|
| Package | TSOT-23-8 (3 mm × 2 mm) | TSOT-23-8 (3 mm × 2 mm) - same | TSOT-23-8 (3 mm × 2 mm) - same | TSOT-23-8 (3 mm × 2 mm) - same | TSOT-23-8 (3 mm × 2 mm) - same | TSOT-23-8 (3 mm × 2 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits (same die) | 16 bits (18-bit-equivalent oversampling) | 16 bits | 24 bits | 20 bits |
| Output Data Rate | 60 samples/sec | 60 samples/sec | 30 samples/sec (high-resolution mode) | 60 samples/sec | Up to ~5 sps (ext-osc dependent) | Up to ~100 sps |
| Digital Interface | I2C | I2C | I2C | I2C | SPI | SPI |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| External Clock Required | No (internal oscillator) | No (internal oscillator) | No (internal oscillator) | No (internal oscillator) | Yes (external oscillator required) | Yes (external oscillator required) |
| Automatic Shutdown Between Conversions | Yes | Yes | Yes | Yes | No (continuously running) | No (continuously running) |
주요 차별점
- Single-ended input from true ground (0 V) to VDD (vs LTC2400ITS8#TRMPBF (24-bit, SPI, differential input))
- Internal oscillator + automatic shutdown for lowest average current (vs LTC2420ITS8#TRMPBF (20-bit SPI ADC))
- Smallest 16-bit delta-sigma ADC footprint at 3 mm × 2 mm (vs TI ADS1115 (MSOP-10 footprint))
설계 노트
Estimated: at a 60 Hz continuous conversion rate, the LTC2451ITS8#TRMPBF draws approximately 200 µA active supply current with VDD = 5 V, dissipating ~1 mW of supply power. Add a 0.1 µF X7R ceramic decoupling capacitor as close as possible to pin 8 (VDD) and pin 4 (GND), and place a 10 µF bulk capacitor near the ADC supply pin. Keep analog and digital ground returns short and join them at a single point to preserve noise-free 16-bit performance.
Route the analog input traces (pin 5 IN+) as short and direct as possible, away from noisy digital traces and away from switching power inductors. Place the I2C pull-up resistors (2.2–10 kΩ depending on bus speed and capacitance) close to the LTC2451 SDA and SCL pins. The two NC pins (2 and 7) can be left floating or grounded for improved mechanical pad stability; do not route high-speed signals under the TSOT-23-8 package body.
The LTC2451ITS8#TRMPBF uses a single-ended analog input that ranges from 0 V to VDD with true ground-referenced measurement capability. For best noise performance, drive the input with a low-impedance op-amp buffer (e.g., LT1461 family or similar) placed within a few millimeters of the ADC input pin. Avoid injecting digital switching noise into the analog input by isolating analog and digital ground planes with a small guard ring or by joining grounds at a single point.
Do not exceed the absolute maximum VDD rating of 6 V; transients above 6 V can permanently damage the ADC. Verify that the I2C slave address version (suffix-dependent) does not collide with other devices on the same bus. Do not connect the LTC2451 analog input to voltages above VDD or below ground without external clamping. Finally, ensure that the SDA/SCL pull-up resistors are present and sized correctly, as missing pull-ups cause intermittent communication errors that are hard to debug.
규정 준수 정보
Per the Analog Devices 2451fg datasheet and DigiKey product listing, the LTC2451ITS8#TRMPBF is lead-free (Pb-free) and RoHS compliant. It is industrial-screened (-40 °C to +85 °C) but NOT AEC-Q100 qualified; for automotive applications, use an AEC-Q100 qualified ADC.
