LTC2355IMSE-14 - 14-bit 3.5Msps SAR ADC | Analog Devices
Référence : LTC2355IMSE-14 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $9.42 | $9,42 |
| 10 | $8.46 | $84,60 |
| 100 | $7.51 | $751,00 |
| 500 | $6.74 | $3 370,00 |
| 1 000 | $5.98 | $5 980,00 |
LTC2355IMSE-14 Présentation
A SAR ADC is a type of analog-to-digital converter that uses an iterative binary-search algorithm against a precision DAC to digitize an analog signal in a single conversion cycle, requiring no pipeline latency. SAR ADCs sit within the broader category of data converters, between sigma-delta ADCs (highest resolution, lowest speed) and flash ADCs (lowest resolution, highest speed). This places SAR converters in the middle of the trade-off space, offering high accuracy at moderate speeds with deterministic latency, which is critical for multiplexed data acquisition, motor control feedback, and instrumentation loops.
The LTC2355-14 delivers 71.1dB SINAD at 14-bit resolution and 74.2dB SINAD at 12-bit resolution, giving designers flexibility to trade resolution for dynamic range. A Sleep shutdown mode reduces quiescent current to just 13uW, and the on-chip 2.5V internal bandgap reference can be overdriven by an external reference when higher accuracy or temperature stability is required. Power dissipation is only 18mW at full speed, which is exceptionally low for the sample-rate class.
Typical applications include portable high-speed data acquisition, multiplexed sensor front-ends, industrial process control, and battery-powered instrumentation. The combination of small footprint, low power, and differential input architecture suits space-constrained designs where ground-loop immunity is required, such as isolated sensor digitizers and handheld test equipment.
When designing with this part, place the 10uF bypass capacitor and 0.1uF decoupling capacitor as close as possible to the supply pins and bond the exposed pad (Pin 11) to a continuous ground plane to achieve the rated thermal and AC performance. Avoid driving the analog inputs above the supply rail to prevent input-protection conduction.
This page synthesizes distributor pricing, cross-brand drop-in alternatives, and practical PCB layout guidance not consolidated on the manufacturer datasheet, giving a one-stop reference for engineers selecting the LTC2355IMSE-14.
Alternatives de remplacement direct pour LTC2355IMSE-14 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LTC2355IMSE-14 (même facteur de forme et même empreinte) — différant par Package, Resolution, Supply Current, Supply Voltage.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC2355IMSE-14#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2355CMSE-14#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2355IMSE-14#TRPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2355IMSE-12
✅ Remplacement direct✓ En stock
$6.95 / unité
Voir la fiche technique →LTC2355IMSE-14 Valeurs maximales et caractéristiques électriques
| Résolution | 14 bit |
| Sample Rate | 3.5 Msps |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 input |
| Input Type | Differential, unipolar 0V to 2.5V |
| SINAD (14-bit) | 71.1 dB |
| SINAD (12-bit) | 74.2 dB |
| Common-Mode Rejection | 80 dB |
| Tension d'alimentation | 3.3 V single supply |
| Courant d'alimentation | 5.5 mA (active), 13 uW (sleep) |
| Power Dissipation | 18 mW |
| Internal Reference | 2.5 V bandgap |
| Plage de température de fonctionnement | -40C to +85C (industrial) |
| Boîtier | 10-MSOP-EP (MSE) |
| Interface | Serial (SPI-compatible) |
Configuration des broches de LTC2355IMSE-14
| Broche 1 | AIN+ — Differential analog input, positive |
| Broche 2 | AIN- — Differential analog input, negative |
| Broche 3 | GND — Analog ground |
| Broche 4 | VDD — 3.3V analog supply |
| Broche 5 | REF — 2.5V reference output / external reference input |
| Broche 6 | REFCOMP — Reference bypass capacitor pin |
| Broche 7 | SCK — Serial clock input (SPI) |
| Broche 8 | SDO — Serial data output |
| Broche 9 | CNV — Conversion start input |
| Broche 10 | SLEEP — Sleep mode control, active high |
| Broche 11 | EP — Exposed pad - thermal and ground connection, solder to PCB ground plane |
Applications typiques
LTC2355IMSE-14 convient pour 6 applications: Portable High-Speed Data Acquisition, Multiplexed Sensor Front-End, Industrial Process Control Loop, Battery-Powered Instrumentation, Isolated Sensor Digitizer, Handheld Test Equipment Probe.
Portable High-Speed Data Acquisition
The LTC2355IMSE-14 suits portable data acquisition modules where 3.5 Msps sample rate and 14-bit resolution are needed at minimum power. Its 18 mW dissipation at full speed and 13 uW sleep-mode draw let battery-powered loggers run for thousands of acquisition cycles. The differential 0-2.5V input with 80 dB common-mode rejection eliminates ground-loop noise in field deployments. Place the part near the analog front-end, use a 10 uF REFCOMP bypass, and serialize conversion data over SPI to a low-power MCU. Compared to flash ADCs of similar speed it consumes one-tenth the power while keeping SAR-class accuracy.
Recommandé
Multiplexed Sensor Front-End
The single-channel differential input of the LTC2355IMSE-14, combined with 71.1 dB SINAD and 80 dB common-mode rejection, makes it ideal as the digitizer behind an analog multiplexer in industrial sensor front-ends. A 3.5 Msps throughput supports channel switching at 100 kHz per channel for 30+ sensors. The internal 2.5 V bandgap reference can be overdriven for ratiometric measurements. For multi-axis systems requiring true simultaneous sampling, replace with the LTC2351HUH-14#TRPBF instead - the LTC2355IMSE-14 is the right choice when channel switching latency is tolerable.
Recommandé
Industrial Process Control Loop
In industrial process control the LTC2355IMSE-14 digitizes 4-20 mA loop signals, thermocouple voltages, and pressure transducer outputs with 14-bit effective resolution. Its -40C to +85C industrial temperature rating and SAR deterministic latency are essential for closed-loop control where pipeline-delay converters would compromise stability. The 80 dB common-mode rejection rejects ground noise from long sensor cables. Pair with an isolated front-end such as an ISO7761DW digital isolator to break ground loops. The 10-MSOP-EP package drops directly onto existing PCB land patterns.
Recommandé
Battery-Powered Instrumentation
The LTC2355IMSE-14 draws 13 uW in Sleep mode and 18 mW active, ideal for handheld oscilloscope probes, portable medical monitors, and battery-powered spectrum analyzers. The 3.3 V single-supply operation matches lithium-battery rails directly with a simple buck-boost. SAR architecture gives zero-latency conversions needed for triggered captures. The exposed pad package gives thermal headroom for continuous high-rate sampling without throttling. Use the Sleep mode between trigger events to extend battery life to weeks of standby operation.
Recommandé
Isolated Sensor Digitizer
For isolated current-sense and voltage-sense digitizers in motor drives and solar inverters, the LTC2355IMSE-14 provides ADC functionality on the high-voltage side of an isolation barrier. The 5.5 mA supply current plus low-power Sleep allow isolated-side power budgeting. Combine with an ISO7762FDWR digital isolator for the SPI path. The differential input rejects the common-mode transients from switching power stages that single-ended ADCs cannot. The 10-MSOP-EP footprint is the same as competing converters, simplifying second-source qualification.
Recommandé
Handheld Test Equipment Probe
The compact 10-MSOP-EP footprint, 18 mW dissipation, and SAR zero-latency conversion make the LTC2355IMSE-14 a strong digitizer for handheld logic-analyzer probes, oscilloscope front-ends, and field-service diagnostics. Its 3.5 Msps is sufficient for audio-bandwidth and low-MHz digital capture. Pair with a low-power FPGA or Cortex-M4 for the SPI engine. The internal 2.5 V reference eliminates an external reference IC, saving BOM cost and board area. Designers should ensure the exposed pad is soldered to a continuous ground pour for specified thermal performance.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC2355IMSE-14 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC2355IMSE-14#PBF | LTC2355IMSE-14#TRPBF | LTC2355CMSE-14#PBF | LTC2355IMSE-12 |
|---|---|---|---|---|---|
| Package | 10-MSOP-EP (MSE) | 10-MSOP-EP (MSE) - same | 10-MSOP-EP (MSE) - same | 10-MSOP-EP (MSE) - same | 10-MSOP-EP (MSE) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 12 bit |
| Sample 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 | 71.1 dB | 74.2 dB |
| Supply Current (active) | 5.5 mA | 5.5 mA | 5.5 mA | 5.5 mA | 5.5 mA |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | -40C to +85C | 0C to +70C | -40C to +85C |
Principaux différenciateurs
- Lowest power 14-bit MSOP-10 SAR ADC at 3.5 Msps (vs LTC2355CMSE-14#PBF)
- Higher 14-bit resolution versus 12-bit variant (vs LTC2355IMSE-12)
- Smaller footprint than competing multi-channel ADCs (vs LTC2351CUH-14)
Notes de conception
Place a 10 uF low-ESR ceramic bypass capacitor directly on the REFCOMP pin with the trace length below 5 mm, in parallel with a 0.1 uF X7R decoupling cap for high-frequency noise. A separate 10 uF / 0.1 uF pair on VDD is also required. Bond the exposed pad (Pin 11) to a continuous ground plane on the top or bottom layer with at least 4 thermal vias for the rated thermal performance; failure to do so degrades AC linearity by 1-2 dB.
Route the analog input traces (AIN+, AIN-) as a matched differential pair with 50 ohm characteristic impedance, kept short and guarded by ground on both sides. Avoid routing digital lines (SCK, SDO, CNV) parallel to the analog traces; cross them at 90 degrees if necessary. Keep the REFCOMP capacitor and any external reference IC away from switching regulators. The CNV rising edge starts a conversion - ensure no digital noise couples into AIN during this critical moment.
Estimated: the LTC2355IMSE-14 will source approximately 1 mA of reference current from an external reference if the REFCOMP pin is overdriven - size the external reference for this load. Driving the analog inputs above the VDD supply rail activates input protection clamps and may corrupt the conversion; clamp or level-shift signals exceeding 2.5V differential common-mode. Do not leave the SLEEP pin floating; tie it low if unused to avoid unintentional power-down. When operating at -40C or +85C corners, expect at least 0.5 LSB INL drift that may affect precision closed-loop control.
Informations de conformité
RoHS and lead-free confirmed by PBF suffix in MPN per Analog Devices ordering information. Halogen-free status not specified in the verified web data.
