LTC2372CUH-18 - 18-Bit 500ksps 8-Ch SAR ADC | Analog Devices
Référence : LTC2372CUH-18 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $17.5 | $17,50 |
| 10 | $15.8 | $158,00 |
| 100 | $13.95 | $1 395,00 |
| 500 | $12.2 | $6 100,00 |
| 1 000 | $10.85 | $10 850,00 |
LTC2372CUH-18 Présentation
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that converts a real-world continuous analog voltage into a discrete digital code proportional to the input. Within the broader signal-chain taxonomy, the LTC2372-18 belongs to the successive-approximation-register ADC family, which sits under precision data converters (alongside delta-sigma and pipeline ADCs) and ultimately the data-acquisition / power-management IC hierarchy. SAR ADCs are favored when applications need high throughput (hundreds of kSPS to multi-MSPS) with low latency and no pipeline delay, at 16- to 20-bit resolution.
Key features include a configurable low-crosstalk 8-channel input multiplexer accepting fully-differential, pseudo-differential unipolar, and pseudo-differential bipolar inputs; a high-speed SPI-compatible serial interface supporting 1.8 V, 2.5 V, 3.3 V, and 5 V logic; a sequencer with a depth of 16; and true 18-bit performance with no missing codes. The single 5 V supply operation simplifies power-tree design, while an internal reference buffer keeps the reference pin stable during single-shot conversions.
Architecturally, the LTC2372-18 combines a high-performance 18-bit capacitive SAR core with an integrated input MUX and an on-chip reference/buffer, eliminating the need for an external low-noise reference and ADC-driver buffer in many precision applications. The combination of 100 dB SNR and 500 kSPS throughput targets instrumentation, medical imaging front-ends, and industrial process control.
Typical applications include multi-channel data-acquisition systems, medical imaging front-ends, precision industrial process control, vibration analysis, and automatic test equipment (ATE). The wide input-range flexibility also supports direct connection to bridge sensors, thermocouples, and RTD front-ends through simple external instrumentation amplifiers.
When laying out the PCB, keep analog and digital ground returns separated under the ADC and join them at a single point near the exposed pad; bypass the 5 V supply with a 1 µF ceramic plus a 10 µF bulk capacitor placed within 5 mm of the AVDD pin. To minimize channel-to-channel crosstalk at 500 kSPS, route the 8 analog inputs with matched impedance and keep them away from the CNV/MCLK/SCK digital traces.
This page synthesizes distributor pricing, drop-in alternatives within the LTC23xx family, and practical layout guidance that complements the manufacturer datasheet.
Alternatives de remplacement direct pour LTC2372CUH-18 — 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 LTC2372CUH-18 (même facteur de forme et même empreinte) — différant par Package, Supply Voltage, Digital Interface, Operating Temperature Range, RoHS Status.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC2372CUH-18#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2372CUH-18#TRPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2372CUH-16
✅ Remplacement direct✓ En stock
$15.75 / unité
Voir la fiche technique →LTC2344CUH-18
✅ Remplacement direct✓ En stock
$18.2 / unité
Voir la fiche technique →LTC2341HUH-18
✅ Remplacement direct✓ En stock
$24.95 / unité
Voir la fiche technique →LTC2372CUH-18 Valeurs maximales et caractéristiques électriques
| Architecture | Successive Approximation Register (SAR) |
| Résolution | 18 bits |
| Number of Input Channels | 8 (single-ended) / 4 (fully-differential) |
| Sample Rate | 500 kSPS |
| Input Type | Fully-differential, pseudo-differential unipolar, pseudo-differential bipolar |
| SNR (Fully-Differential) | 100 dB (typical) |
| SNR (Pseudo-Differential) | 95 dB (typical) |
| INL (max) | ±2.75 LSB |
| Missing Codes | None at 18 bits |
| Internal Reference | 2.048 V, 20 ppm/°C max drift |
| Reference Buffer | Single-shot capable, integrated |
| Tension d'alimentation | Single 5 V |
| Digital Interface | SPI-compatible serial, 1.8 V / 2.5 V / 3.3 V / 5 V logic |
| Sequencer Depth | 16 entries |
| Boîtier | 32-QFN (5x5 mm), exposed pad |
| Statut RoHS | Compliant (PBF suffix) |
Configuration des broches de LTC2372CUH-18
| Broche 1 | AIN0 — Analog input channel 0 (MUX-selected) |
| Broche 2 | AIN1 — Analog input channel 1 (MUX-selected) |
| Broche 3 | AIN2 — Analog input channel 2 (MUX-selected) |
| Broche 4 | AIN3 — Analog input channel 3 (MUX-selected) |
| Broche 5 | AIN4 — Analog input channel 4 (MUX-selected) |
| Broche 6 | AIN5 — Analog input channel 5 (MUX-selected) |
| Broche 7 | AIN6 — Analog input channel 6 (MUX-selected) |
| Broche 8 | AIN7 — Analog input channel 7 (MUX-selected) |
| Broche 9 | REFGND — Reference ground return |
| Broche 10 | REFIN — Reference input / bypass (2.048 V internal) |
| Broche 11 | GND — Analog ground |
| Broche 12 | AVDD — 5 V analog supply |
| Broche 13 | OVDD — Digital I/O supply (1.8 V / 2.5 V / 3.3 V / 5 V) |
| Broche 14 | REFON — Reference buffer control |
| Broche 15 | CHAIN — Channel scan / sequencer chain input |
| Broche 16 | SDOUTA — Serial data output A |
| Broche 17 | SDOUTB — Serial data output B |
| Broche 18 | SCKA — Serial clock A input |
| Broche 19 | SCKB — Serial clock B input |
| Broche 20 | BUSY — Conversion busy indicator |
| Broche 21 | RDLA — Read A - data latch / frame sync |
| Broche 22 | RDLB — Read B - data latch / frame sync |
| Broche 23 | CNV — Conversion start input |
| Broche 24 | RESET — Digital reset |
| Broche 25 | INT0 — Interrupt / sequencer flag 0 |
| Broche 26 | INT1 — Interrupt / sequencer flag 1 |
| Broche 27 | CFG0 — Configuration / mode select 0 |
| Broche 28 | CFG1 — Configuration / mode select 1 |
| Broche 29 | NC — Not connected (per datasheet) |
| Broche 30 | NC — Not connected (per datasheet) |
| Broche 31 | NC — Not connected (per datasheet) |
| Broche 32 | NC — Not connected (per datasheet) |
Applications typiques
LTC2372CUH-18 convient pour 6 applications: Multi-Channel Data Acquisition, Medical Imaging Front-End, Precision Industrial Process Control, Vibration & Acoustic Analysis, Automatic Test Equipment (ATE), Spectrum & Signal Analyzer IF Digitizer.
Multi-Channel Data Acquisition
The LTC2372CUH-18's integrated 8-channel low-crosstalk input MUX and 500 kSPS throughput make it ideal for multi-channel data-acquisition cards at the heart of industrial and laboratory systems. Throughput depends on aggregate sampling across all 8 channels - at 500 kSPS the per-channel rate is 62.5 kSPS, well-matched to process-control loop rates. With 100 dB SNR and 18-bit no-missing-codes performance it preserves dynamic range from strain-gauge, RTD, and thermocouple front-ends without downstream averaging.
Recommandé
Medical Imaging Front-End
Ultrasound, CT, and PET front-end signal chains demand high dynamic range simultaneously with low-latency conversion per channel. The LTC2372CUH-18's 100 dB fully-differential SNR plus integrated reference buffer eliminates drift between conversions, preserving small-signal integrity in imaging chains. The configurable MUX allows 4 fully-differential instrumentation channels per chip, with 500 kSPS aggregate throughput supporting sub-beamformer-rate oversampling. Per the Analog Devices datasheet, low channel-to-channel crosstalk makes it suitable when imaging heads multiplex multiple probe elements through one ADC.
Recommandé
Precision Industrial Process Control
PLC and DCS analog input modules with 4-20 mA / 0-10 V conditioning need 18-bit accuracy at channel-update rates that match control loop bandwidths. The LTC2372CUH-18's 8 input channels through one ADC eliminate external multiplexers in 8-slot subsystems, while the SPI-compatible interface to 1.8 V - 5 V logic connects directly to most modern microcontrollers and FPGAs. Tight INL (±2.75 LSB) and no missing codes at 18-bit ensure calibration drift stays within process tolerances; the integrated 20 ppm/°C reference simplifies temperature-coast design.
Recommandé
Vibration & Acoustic Analysis
Mechanical vibration analyzers, modal-test rigs, and acoustic measurement instruments demand 18-bit dynamic range with multi-channel synchronous sampling at audio-bandwidth rates. The LTC2372CUH-18's 500 kSPS throughput and 100 dB SNR capture both envelope and transient details of accelerometer and microphone signals. Through its MUX, eight IEPE-sensor front-ends can be digitized by a single chip, with the SPI-compatible serial interface stream-multiplexing into a small FPGA or DSP for FFT processing.
Recommandé
Automatic Test Equipment (ATE)
Semiconductor ATE and board-test systems need 18-bit resolution at hundreds of kSPS per channel for parametric measurement (V/I/R). The LTC2372CUH-18's 500 kSPS, 8-channel MUX and built-in precision reference let one chip handle multiple DUT pins with sub-100 µV resolution. SPI-compatible 1.8 V - 5 V logic interfaces directly to PXI/USB backplane controllers, and 100 dB SNR supports low-distortion AC stimulus measurement (THD+N) common in audio and signal-chain testers.
Recommandé
Spectrum & Signal Analyzer IF Digitizer
Wideband spectrum and signal analyzers convert IF stages in the 1-10 MHz range using 18-bit high-throughput ADCs. The LTC2372CUH-18's 500 kSPS rate handles narrow-band analysis up to ~200 kHz, while its 100 dB SNR preserves analyzer dynamic range to measure spurs and intermodulation products. Combining the ADC with an external low-noise IF preamp simplifies the IF section; the integrated reference removes a major source of gain drift across sweep duration.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC2372CUH-18 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC2372CUH-18#TRPBF | LTC2372CUH-16 | LTC2344CUH-18 | LTC2341HUH-18 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 32-QFN (5x5) | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same |
| Resolution | 18 bit | 18 bit | 16 bit | 18 bit | 18 bit |
| Sample Rate (max) | 500 kSPS | 500 kSPS | 500 kSPS | 200 kSPS | 100 kSPS |
| Number of Input Channels | 8 (MUX) | 8 (MUX) | 8 (MUX) | 4 simultaneous | Higher count variant |
| SNR (Fully-Differential) | 100 dB | 100 dB | 95 dB | 98 dB | 98 dB |
| Internal Reference | 2.048 V, 20 ppm/°C max | 2.048 V | 2.048 V | Integrated | Integrated |
| Digital Interface Logic | 1.8 V / 2.5 V / 3.3 V / 5 V SPI | Same SPI logic levels | Same SPI logic levels | Same SPI logic levels | Same SPI logic levels |
Principaux différenciateurs
- Integrated 8-channel low-crosstalk MUX with 100 dB FD SNR at 500 kSPS (vs LTC2344CUH-18)
- On-chip 20 ppm/°C max reference with single-shot buffer (vs LTC2341HUH-18)
- 1.8 V to 5 V logic SPI-compatible interface with 16-entry sequencer (vs LTC2372CUH-16)
Notes de conception
Estimated: For the 32-QFN (5x5) LTC2372CUH-18, route analog inputs with controlled 50-ohm impedance and a continuous ground-reference plane. Place a 1 µF X7R ceramic plus a 10 µF tantalum within 5 mm of the AVDD pin and replicate the bypass cluster for OVDD. Dedicate a single solid analog ground return from the exposed pad to the analog star-point; do not split the plane beneath the device.
Channel-to-channel crosstalk on the MUX can couple digital switching into an adjacent analog input at full 500 kSPS throughput. Keep CNV, SCKA/SCKB, and SDOUT traces well away from AINx traces; route them on opposite sides of the package. Add a 10 kΩ/100 nF RC anti-alias filter on each AINx line at the connector side of the MUX, matching corner frequencies across all 8 channels to within ±5%.
Estimated: When the user mode is configured for pseudo-differential bipolar inputs, the negative input must be driven to the correct common-mode voltage (typically REFIN) and not left floating - a floating pseudo-differential negative input induces non-linearity and degrades SNR. Always check the datasheet mode configuration bits (CFG0/CFG1) match the actual analog front-end topology. Avoid toggling CHAIN faster than the BUSY falling edge; the sequencer is re-armed on this event and unstable timing drops conversions.
Solder the exposed thermal pad directly to the analog ground plane using an array of thermal vias (4-9 vias, 0.3 mm diameter) to dissipate internal reference heat. Internal reference drift of 20 ppm/°C max means that a 10 °C temperature rise produces only ~0.4 LSB error at 18 bits, but enclosed chassis without airflow can push the die temperature 30-40 °C above ambient - keep heat-generating digital devices away from the ADC.
Informations de conformité
Pb-free RoHS-compliant per PBF suffix. Not AEC-Q100 qualified; for automotive, consult Analog Devices' official automotive-qualified SAR ADC portfolio. Halogen-free status not explicitly stated in the verified web data.
