LTC2372CUH-18 - 18-Bit 500ksps 8-Ch SAR ADC | Analog Devices
MPN: LTC2372CUH-18 ✓ Hoạt độngLTC2372CUH-18 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho LTC2372CUH-18 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC2372CUH-18 (cùng hình factor và footprint) — khác nhau ở Package, Supply Voltage, Digital Interface, Operating Temperature Range, RoHS Status.
LTC2372CUH-18#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2372CUH-18#TRPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2372CUH-16
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2344CUH-18
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2341HUH-18
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2372CUH-18 Tỷ lệ tối đa & tính chất điện
| Architecture | Successive Approximation Register (SAR) |
| Độ phân giải | 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 |
| Điện áp cung cấp | Single 5 V |
| Digital Interface | SPI-compatible serial, 1.8 V / 2.5 V / 3.3 V / 5 V logic |
| Sequencer Depth | 16 entries |
| Hộp | 32-QFN (5x5 mm), exposed pad |
| Trạng thái RoHS | Compliant (PBF suffix) |
Cấu hình chân LTC2372CUH-18
| Chân 1 | AIN0 — Analog input channel 0 (MUX-selected) |
| Chân 2 | AIN1 — Analog input channel 1 (MUX-selected) |
| Chân 3 | AIN2 — Analog input channel 2 (MUX-selected) |
| Chân 4 | AIN3 — Analog input channel 3 (MUX-selected) |
| Chân 5 | AIN4 — Analog input channel 4 (MUX-selected) |
| Chân 6 | AIN5 — Analog input channel 5 (MUX-selected) |
| Chân 7 | AIN6 — Analog input channel 6 (MUX-selected) |
| Chân 8 | AIN7 — Analog input channel 7 (MUX-selected) |
| Chân 9 | REFGND — Reference ground return |
| Chân 10 | REFIN — Reference input / bypass (2.048 V internal) |
| Chân 11 | GND — Analog ground |
| Chân 12 | AVDD — 5 V analog supply |
| Chân 13 | OVDD — Digital I/O supply (1.8 V / 2.5 V / 3.3 V / 5 V) |
| Chân 14 | REFON — Reference buffer control |
| Chân 15 | CHAIN — Channel scan / sequencer chain input |
| Chân 16 | SDOUTA — Serial data output A |
| Chân 17 | SDOUTB — Serial data output B |
| Chân 18 | SCKA — Serial clock A input |
| Chân 19 | SCKB — Serial clock B input |
| Chân 20 | BUSY — Conversion busy indicator |
| Chân 21 | RDLA — Read A - data latch / frame sync |
| Chân 22 | RDLB — Read B - data latch / frame sync |
| Chân 23 | CNV — Conversion start input |
| Chân 24 | RESET — Digital reset |
| Chân 25 | INT0 — Interrupt / sequencer flag 0 |
| Chân 26 | INT1 — Interrupt / sequencer flag 1 |
| Chân 27 | CFG0 — Configuration / mode select 0 |
| Chân 28 | CFG1 — Configuration / mode select 1 |
| Chân 29 | NC — Not connected (per datasheet) |
| Chân 30 | NC — Not connected (per datasheet) |
| Chân 31 | NC — Not connected (per datasheet) |
| Chân 32 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
LTC2372CUH-18 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2372CUH-18 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Integrated 8-channel low-crosstalk MUX with 100 dB FD SNR at 500 kSPS (vsLTC2344CUH-18)
- On-chip 20 ppm/°C max reference with single-shot buffer (vsLTC2341HUH-18)
- 1.8 V to 5 V logic SPI-compatible interface with 16-entry sequencer (vsLTC2372CUH-16)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
