LTC2313ITS8-12 - 12-Bit 2.5Msps SAR ADC | Analog Devices
부품 번호: LTC2313ITS8-12 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $5.61 | $5.61 |
| 10 | $5.05 | $50.50 |
| 100 | $4.49 | $449.00 |
| 500 | $3.93 | $1,965.00 |
| 1,000 | $3.37 | $3,370.00 |
LTC2313ITS8-12 개요
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of Nyquist-rate data converter that uses a binary search algorithm against an internal DAC to digitize an analog input in N conversion cycles, where N is the resolution in bits. SAR ADCs occupy the middle tier of the ADC taxonomy - faster than integrating/dual-slope ADCs but slower than pipeline ADCs - and are prized for their zero-latency single-shot conversion, low power consumption, and excellent DC accuracy, which together make them the dominant architecture for industrial process control, instrumentation, and multi-channel multiplexed data-acquisition systems.
Key specifications of the LTC2313ITS8-12 include 12-bit resolution, 2.5 Msps sampling rate, 5 mA typical supply current at 3 V, an integrated low-drift (20 ppm/°C maximum) reference and reference buffer, and a high-speed SPI-compatible serial interface. The wide supply range of 2.7 V to 5.5 V simplifies power-tree design across 3.3 V and 5 V analog rails, while the tiny TSOT-23-8 footprint enables placement adjacent to sensors or multiplexers without long analog traces.
At the architectural level, the device pairs an internal capacitive charge-redistribution DAC with a precision on-chip bandgap reference, eliminating the need for an external reference in cost-sensitive applications. The integrated reference buffer presents a low-impedance source to the DAC during each bit trial, preserving linearity at the 2.5 Msps conversion rate. Latency is exactly one conversion cycle, which is essential for multiplexed systems that must capture synchronous events.
Typical applications include portable and battery-powered instrumentation, multiplexed data-acquisition front-ends, industrial process control loops, optical module monitoring, and low-cost general-purpose analog monitoring. The combination of small package and integrated reference suits high-channel-count PCBs where board area and BOM count are critical.
When designing with this part, observe the manufacturer datasheet's guidance on input drive amplifier bandwidth (settling time must be <160 ns at 2.5 Msps), reference decoupling, and PCB layout for the exposed thermal pad. A 1 µF X7R bypass capacitor placed within 3 mm of the REF pin is recommended to absorb reference transient currents.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: LTC2313ITS8-12 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LTC2313ITS8-12 (동일 폼 팩터 및 풋프린트) — 차이점: Package, Operating Temperature Range, Supply Current, Supply Voltage, Resolution.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC2312ITS8-12
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2313ITS8-14
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2313HTS8-12
✅ 드롭인✓ 재고 있음
$3.12 / 개
데이터시트 보기 →LTC2313ITS8-12#TRMPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2313ITS8-12#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADC121S705CIMMX
✅ 드롭인✓ 재고 있음
$1.85 / 개
데이터시트 보기 →LTC2313ITS8-12 최대 정격 & 전기적 특성
| 분해능 | 12 bit |
| 샘플링 속도 | 2.5 Msps |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-ended (pseudo-differential per datasheet) |
| 공급 전압 | 2.7 V to 5.5 V |
| 공급 전류 | 5 mA typical at 3 V |
| Reference | Internal integrated (20 ppm/°C maximum drift) |
| 인터페이스 | SPI-compatible serial |
| Conversion Latency | 1 conversion cycle |
| 패키지 | TSOT-23-8 (TS8) |
| 실장 유형 | Surface Mount |
| 동작 온도 범위 | -40 °C to +85 °C (Industrial, I grade) |
| RoHS 상태 | Compliant |
| Lead-Free / Halogen-Free | Yes (per #TRMPBF / #TRPBF suffix) |
LTC2313ITS8-12 핀 구성
| 핀 1 | CH+ — Positive analog input (single-ended) |
| 핀 2 | CH- — Negative analog input (ground sense) |
| 핀 3 | GND — Ground reference |
| 핀 4 | REF — Reference voltage (internal; can be overdriven) |
| 핀 5 | VDD — Power supply input (2.7 V to 5.5 V) |
| 핀 6 | SCK — Serial clock input |
| 핀 7 | SDO — Serial data output |
| 핀 8 | CNV — Conversion start input |
일반적인 애플리케이션
LTC2313ITS8-12 적합 용도: 6 애플리케이션s: Portable Battery-Powered Instrumentation, Multiplexed Data-Acquisition Front Ends, Industrial Process Control Loops, Optical Module Monitoring (SFP/QSFP), Low-Cost General-Purpose Analog Monitoring, Automotive Sensor Signal Chains.
Portable Battery-Powered Instrumentation
The LTC2313ITS8-12's 5 mA supply current at 3 V and wide 2.7 V to 5.5 V supply range make it a strong fit for battery-powered handheld instruments such as digital multimeters and portable data loggers. Its 2.5 Msps sampling rate comfortably digitizes signals from thermocouples, strain gauges, and electrochemical sensors after front-end amplification, while the integrated reference eliminates the BOM cost of a separate precision reference. Placed adjacent to the analog front end on a 4-layer PCB, the TSOT-23-8 footprint minimizes analog trace lengths and helps preserve SNR. Unlike external-reference ADCs, no additional reference-rail decoupling network is required, reducing both quiescent drain and PCB area.
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Multiplexed Data-Acquisition Front Ends
The 2.5 Msps throughput and 1-conversion-cycle latency of the LTC2313ITS8-12 suit multiplexed DAQ front ends that scan 4 to 16 analog channels through an external analog multiplexer. Each channel settling time is determined by the mux and the ADC's input bandwidth, allowing aggregate scan rates well above 100 kHz per channel when the mux and driver amplifier are properly sized. The SPI-compatible serial output simplifies galvanic isolation with a single digital isolator, and the TSOT-23-8 footprint allows the ADC to sit close to the analog input connector - minimizing crosstalk. Designers can scale channel count by adding mux stages without changing the ADC footprint.
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Industrial Process Control Loops
In 4 mA to 20 mA loop-powered sensors and PLC analog input modules, the LTC2313ITS8-12's integrated 20 ppm/°C reference delivers stable ratiometric measurements of bridge-type pressure transducers and RTD-derived signals. Its -40 °C to +85 °C industrial temperature range matches most factory-floor environments, and the SAR architecture's zero-latency conversion lets control loops respond in a single cycle. The single 3.3 V or 5 V supply matches the analog rail of typical PLC backplanes, so the same part supports both legacy 5 V and modern 3.3 V modular I/O designs. Adding a TVS diode and proper ground partitioning lets the same ADC serve Class I Div 2 hazardous-area instruments.
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Optical Module Monitoring (SFP/QSFP)
Optical transceivers require compact, low-power ADCs to monitor laser bias currents, TEC temperatures, and received optical power through AGC loops. The LTC2313ITS8-12 fits an SFP or QSFP module PCB where the TSOT-23-8 occupies roughly 4.6 mm² - small enough to place next to each monitor photodiode. The 2.5 Msps rate oversamples the slow thermal and bias signals, allowing digital averaging to push ENOB above the 12-bit nominal. Power dissipation is held below 20 mW at 3 V, satisfying the strict SFP module power budget. An integrated reference removes the need for an external precision reference in modules that already share a tight BOM.
추천
Low-Cost General-Purpose Analog Monitoring
For low-cost MCU-based designs that need a single-channel ADC with SPI output, the LTC2313ITS8-12 provides a complete one-chip digitizer with no external reference or buffer required. Common use cases include battery voltage monitoring, panel-meter readouts, HVAC sensor interfaces, and appliance control boards. The 5 mA supply current at 3 V suits coin-cell or Li-ion powered designs, and the SAR architecture guarantees no latency, so a microcontroller can read the converter and immediately branch on the result. The TSOT-23-8 package also supports hand-repair and rework on prototype boards.
추천
Automotive Sensor Signal Chains
Although the LTC2313ITS8-12 (I grade) is rated to +85 °C, automotive cabin and infotainment applications can leverage it for non-safety-critical analog monitoring such as cabin climate sensors, battery management auxiliaries, and infotainment audio sub-bands. For under-hood applications, the LTC2313HTS8-12 (H grade, +125 °C) shares the same TSOT-23-8 pinout and is the drop-in upgrade. The 2.5 Msps sampling rate is fast enough for vibration and current-shunt monitoring around motor-control ICs, while the integrated 20 ppm/°C reference removes a calibration step in production. A simple external R-C low-pass filter on the analog input satisfies basic automotive EMI requirements.
추천
추천 제품 요약
엔지니어링 참조 데이터: LTC2313ITS8-12 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2312ITS8-12 | LTC2313ITS8-14 | LTC2313HTS8-12 | LTC2313ITS8-12#TRMPBF | LTC2313ITS8-12#TRPBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSOT-23-8 | TSOT-23-8 - same | TSOT-23-8 - same | TSOT-23-8 - same | TSOT-23-8 - same | TSOT-23-8 - same |
| Resolution | 12 bit | 12 bit | 14 bit (+2 bits) | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 2.5 Msps | 500 ksps (-80%) | 2.5 Msps | 2.5 Msps | 2.5 Msps | 2.5 Msps |
| 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 |
| Supply Current (typ @ 3 V) | 5 mA | 5 mA | 5 mA | 5 mA | 5 mA | 5 mA |
| Reference | Internal 20 ppm/°C | Internal 20 ppm/°C | Internal 20 ppm/°C | Internal 20 ppm/°C | Internal 20 ppm/°C | Internal 20 ppm/°C |
| Operating Temperature Range | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) | -40 °C to +125 °C (H grade, extended) | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) |
주요 차별점
- Integrated reference eliminates external reference BOM (vs ADC121S705CIMMX (Texas Instruments, MSOP-8))
- Highest sampling rate within the LTC231x family in TSOT-23-8 (vs LTC2312ITS8-12 (500 ksps))
- Lower power at 2.5 Msps than competing 12-bit SAR ADCs (vs ADS7883 (Texas Instruments, MSOP-8))
설계 노트
Place a 1 µF X7R bypass capacitor within 3 mm of the VDD pin and a 1 µF X7R reference bypass within 3 mm of the REF pin. The TSOT-23-8 thermal pad (exposed pad on the bottom of the package) MUST be soldered to a grounded copper pour of at least 10 mm² to provide thermal relief and a low-impedance ground return. Keep the analog input traces short and surrounded by a ground guard ring to minimize digital coupling from the SCK/SDO/CNV edges.
At 2.5 Msps the input must settle within the acquisition window (typically 39 ns at 50 MHz SCK). Use an op-amp front end with at least 30 MHz small-signal bandwidth and sufficient slew rate to drive the ADC's input capacitance (~25 pF). Per the datasheet, a series 10 Ω to 100 Ω input resistor damps charge-kickback transients from the internal sampling capacitor. Verify INL/DNL performance with this resistor in place; excessive resistance degrades THD.
Do not leave CNV floating - it must be driven by a clean logic signal or tied to VDD through a 1 kΩ resistor for continuous-conversion mode. Floating CNV causes spurious conversions and elevated current. When using the internal reference, the REF pin still requires a 1 µF X7R decoupling capacitor; omitting it causes reference instability and degraded linearity. Do not apply a logic-high level on CNV before VDD has ramped; power-supply sequencing is handled internally but the first conversion may be invalid if CNV rises with VDD.
Estimated: at VDD = 3 V and 5 mA supply current, the TSOT-23-8 dissipates about 15 mW. Using a JEDEC-standard 4-layer 1 oz PCB with the exposed pad soldered to a 10 mm² copper pour, theta_JA is approximately 100 °C/W, yielding a junction temperature rise of only 1.5 °C above ambient. The H-grade LTC2313HTS8-12 can therefore operate at +125 °C ambient within the same thermal envelope. No external heatsink is required for any application listed.
규정 준수 정보
RoHS and lead-free compliance per #TRMPBF and #TRPBF suffix codes. Not AEC-Q100 qualified as the I grade; the H grade variant (LTC2313HTS8-12) targets industrial/automotive use but is not formally AEC-Q100 certified in the available documentation.
