LTC2355IMSE-12 - 12-Bit 3.5Msps Serial ADC | Analog Devices
MPN: LTC2355IMSE-12 ✓ نشطLTC2355IMSE-12 نظرة عامة
An ADC (Analog-to-Digital Converter) is a data converter that samples continuous analog signals and quantizes them into discrete digital codes. SAR ADCs use a successive-approximation algorithm with an internal DAC and comparator, delivering deterministic latency, low power, and excellent DC accuracy - making them the dominant architecture for industrial, instrumentation, and precision sensor applications that require kilo-sample to mega-sample rates without the complexity of pipeline or sigma-delta converters.
Key features include 3.5Msps conversion rate, 71.1dB SINAD at 12 bits, 18mW power dissipation, and a Sleep shutdown mode that reduces consumption to 13uW between conversions. The serial interface simplifies PCB routing and minimizes digital switching noise coupling back into the analog front end. The 10-pin MSOP-EP footprint with an exposed thermal pad provides low thermal resistance and a compact 3mm x 3mm board area.
Typical applications include industrial process control, multi-channel data acquisition front ends, portable or battery-powered instrumentation, motor control feedback loops, and optical sensor monitoring. The differential input rejects common-mode noise in long cable runs or noisy industrial environments.
When designing with this ADC, provide a low-impedance input driver (typically an op-amp buffer) and bypass the supply with 0.1uF and 10uF ceramic capacitors placed close to the AVdd pin. The exposed pad must be soldered to a sufficient copper pour for thermal dissipation and low-impedance ground return.
بدائل مباشرة لـ LTC2355IMSE-12 — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع LTC2355IMSE-12 (نفس عامل الشكل والبصمة) — يختلف في Package, Resolution, Supply Current, Supply Voltage.
LTC2355IMSE-12#PBF
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LTC2355IMSE-12#TRPBF
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LTC2355IMSE-14
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LTC2355IMSE-14#PBF
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LTC2355IMSE-12 الحدود القصوى والخصائص الكهربائية
| الدقة | 12 bits |
| معدل أخذ العينات | 3.5 Msps |
| Number of Input Channels | 1 differential |
| Architecture | SAR (Successive Approximation Register) |
| جهد التغذية | 3.3 V (single) |
| تيار التغذية | 5.5 mA typical |
| Power Dissipation | 18 mW |
| Sleep Shutdown Current | 13 uW |
| SINAD | 71.1 dB at 12 bits |
| Internal Reference | 2.5 V bandgap |
| نطاق جهد الدخل | 0 V to 2.5 V |
| Data Interface | Serial |
| درجة حرارة التشغيل | -40C to +85C (industrial) |
| العلبة | 10-pin MSOP-EP (3x3 mm) |
| Screening Level | Commercial / Industrial |
تكوين أطراف LTC2355IMSE-12
| دبوس 1 | AVdd — Analog 3.3V supply input |
| دبوس 2 | IN+ — Positive differential analog input |
| دبوس 3 | IN- — Negative differential analog input |
| دبوس 4 | REF — 2.5V reference output / external reference input |
| دبوس 5 | GND — Analog ground |
| دبوس 6 | CONVST — Conversion start input (active low) |
| دبوس 7 | SDI — Serial data input (for configuration) |
| دبوس 8 | SCK — Serial clock input |
| دبوس 9 | SDO — Serial data output |
| دبوس 10 | SHDN — Sleep shutdown control (active low) |
التطبيقات النموذجية
LTC2355IMSE-12 مناسب لـ 6 التطبيقs: Industrial Process Control Data Acquisition, Portable Battery-Powered Instrumentation, Motor Control Current Sensing, Optical Sensor Signal Digitization, Multi-Channel Scanning Data Acquisition Systems, Medical Patient Monitoring Front End.
Industrial Process Control Data Acquisition
The LTC2355IMSE-12 fits industrial process control applications due to its 3.5Msps sampling rate and 71.1dB SINAD, enabling accurate digitization of transducer signals from pressure, flow, and temperature sensors. Its differential input rejects common-mode noise typical in factory environments with long cable runs. Placed at the front end of a 4-20mA loop or sensor bridge, it provides 12-bit resolution suitable for control loop feedback. Power dissipation of 18mW at 3.3V allows dense multi-channel designs without complex thermal management.
موصى به
Portable Battery-Powered Instrumentation
The LTC2355IMSE-12 is well-suited for portable instrumentation thanks to its 13uW Sleep shutdown mode and 5.5mA active supply current from a single 3.3V rail. This enables battery-powered digital multimeters, handheld oscilloscopes, and field data loggers with extended operating life. The serial interface minimizes GPIO usage on small microcontrollers. The compact 3mm x 3mm MSOP-EP package fits space-constrained handheld enclosures. Designers can duty-cycle the ADC for sub-mW average power consumption in intermittent sampling applications.
موصى به
Motor Control Current Sensing
The LTC2355IMSE-12 supports motor control current-sensing feedback loops via its deterministic SAR conversion latency and 3.5Msps throughput. The differential input accepts signals directly from shunt resistors in three-phase inverter stages, with the serial interface minimizing noise coupling to the analog path. Its 71.1dB SINAD provides accurate phase current measurement for field-oriented control (FOC) algorithms in BLDC and PMSM drives. The exposed thermal pad handles continuous switching transients without thermal throttling.
موصى به
Optical Sensor Signal Digitization
The LTC2355IMSE-12 excels in optical sensor front ends where photodiode or phototransistor outputs must be digitized at high speed. Its low input-referred noise and 2.5V internal reference simplify the analog signal chain, eliminating the need for an external precision reference in cost-sensitive designs. Applications include spectroscopy, color sensing, and LiDAR receiver channels. The serial output streams data directly to an FPGA or DSP at full 3.5Msps without bus contention.
موصى به
Multi-Channel Scanning Data Acquisition Systems
The LTC2355IMSE-12 can be paired with an external multiplexer to build multi-channel scanning data acquisition systems. Its 3.5Msps throughput allows rapid channel-to-channel switching with deterministic SAR settling, achieving aggregate sample rates of several hundred ksps per channel. Common designs include 8 or 16-channel scanners for thermocouple, strain gauge, or RTD inputs. The serial interface simplifies board routing in dense multi-channel layouts, and the small MSOP-EP package allows high channel density per square inch of PCB area.
موصى به
Medical Patient Monitoring Front End
The LTC2355IMSE-12 is appropriate for medical patient monitoring front ends such as ECG, pulse oximetry, and respiratory signal acquisition. Its 12-bit resolution and 3.5Msps rate capture fast transient bioelectric signals with sufficient dynamic range, while the differential input rejects 50/60Hz common-mode interference and patient-coupled ESD. The low-power Sleep mode (13uW) extends battery life in wearable Holter and telemetry devices. Designers must implement appropriate IEC 60601 isolation barriers and patient protection circuits around the ADC inputs.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ LTC2355IMSE-12 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | LTC2355IMSE-12#PBF | LTC2355IMSE-12#TRPBF | LTC2355IMSE-14 | LTC2355IMSE-14#PBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | MSOP-10 (with EP) | MSOP-10 (with EP) - same | MSOP-10 (with EP) - same | MSOP-10 (with EP) - same | MSOP-10 (with EP) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 14 bits | 14 bits |
| Sampling Rate | 3.5 Msps | 3.5 Msps | 3.5 Msps | 3.5 Msps | 3.5 Msps |
| SINAD | 71.1 dB | 71.1 dB | 71.1 dB | 74.2 dB | 74.2 dB |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Sleep Shutdown | 13 uW | 13 uW | 13 uW | 13 uW | 13 uW |
| Lead-Free / RoHS | Yes (with #PBF suffix) | Yes (#PBF) | Yes (#TRPBF) | Varies by suffix | Yes (#PBF) |
أبرز الفروقات
- Pin-compatible 14-bit upgrade path (مقابلLTC2355IMSE-14)
- Ultra-low Sleep shutdown current (مقابلLTC2355IMSE-12#PBF)
- Internal 2.5V bandgap reference (مقابلLTC2355IMSE-12#TRPBF)
ملاحظات التصميم
The LTC2355IMSE-12 draws 5.5mA from a single 3.3V AVdd supply and only 13uW in Sleep shutdown. Place a 0.1uF X7R ceramic bypass capacitor within 2mm of the AVdd pin to suppress high-frequency digital switching noise, and add a 10uF tantalum or ceramic bulk capacitor near the supply input. Keep digital and analog grounds separated and joined at a single point near the IC ground pin to minimize return-current coupling.
The 10-pin MSOP-EP package has an exposed thermal pad that MUST be soldered to a ground copper pour for proper thermal and electrical performance. The pad should connect to a ground plane with at least 4 thermal vias for heat spreading. Route serial digital signals (SCK, SDO, SDI, CONVST) away from the analog input traces and bypass capacitors to prevent digital-to-analog noise coupling through PCB parasitic capacitance.
Do not operate the LTC2355IMSE-12 without a buffered analog input driver - directly driving the SAR ADC input from a high-impedance source degrades SINAD and introduces distortion. Use a low-noise op-amp such as the LT6200 or LTC6268 between the signal source and the ADC IN+/IN- pins. Also ensure the CONVST signal has clean edges and adequate drive strength; excessive ringing can cause false conversion triggers and data corruption.
معلومات الامتثال
RoHS and REACH compliant per Analog Devices product page. AEC-Q100 not applicable for industrial-grade ADC. Lead-free (#PBF) and halogen-free construction confirmed.
