LTC2341HUH-18 - 18-Bit, 666kSPS Dual SAR ADC | ADI
MPN: LTC2341HUH-18 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $35.2 | $352.00 |
| 100 | $31.85 | $3,185.00 |
| 500 | $27.6 | $13,800.00 |
| 1,000 | $24.95 | $24,950.00 |
LTC2341HUH-18 Overview
A SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm against a precision reference to resolve each input sample in N bit-clock periods. The SAR family sits in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> signal chain. Within ADC families, SAR converters bridge the gap between the speed of pipeline ADCs and the noise precision of sigma-delta ADCs, making them the topology of choice for multiplexed or simultaneous multi-channel data acquisition (DAQ) systems where zero latency and true bipolar input range are required.
Key features of the LTC2341HUH-18 include a maximum conversion rate of 666 ksps per channel, integrated 2.5 V low-drift reference, on-chip reference buffer, simultaneous sampling across both channels, wide input common-mode range, pin-selectable CMOS/LVDDS digital interface (1.8 V to 5 V logic), and 32-QFN (5x5) thermally-enhanced packaging. The SoftSpan feature allows per-channel input range reconfiguration without external scaling resistors, drastically simplifying front-end design for multi-range DAQ systems.
From an architectural perspective, the LTC2341HUH-18 uses a charge-redistribution SAR core with proprietary common-mode sampling, enabling true differential input sampling over a ±10.24 V common mode. The integrated reference and buffer eliminate the need for an external low-noise reference plus dedicated reference buffer, reducing BOM count and PCB area. The CMOS or LVDDS serial interface is pin-selectable, allowing the same device to communicate with legacy 5 V microcontrollers, modern 1.8 V FPGAs, or LVDS-class ASICs.
Typical applications include industrial process control and instrumentation, automatic test equipment (ATE), programmable logic controllers (PLC) analog input modules, multi-channel data acquisition (DAQ) boards, and precision medical instrumentation. The simultaneous-sampling capability is especially valuable in polyphase power, sonar, and vibration analysis where inter-channel phase coherence must be preserved.
When designing with the LTC2341HUH-18, use solid ground planes, place the 10 uF decoupling capacitor immediately at AVDD/DVDD, route differential inputs as tightly-coupled pairs, and follow the recommended layout in the manufacturer datasheet to achieve datasheet SNR/THD performance. Avoid sharing the analog ground return with noisy digital return currents; star-ground the exposed pad to a quiet AGND pour.
This page synthesizes verified distributor pricing, drop-in alternative cross-references, and practical design guidance for the LTC2341HUH-18 that go beyond the manufacturer datasheet - including same-family variants and cross-brand equivalents sharing the same 32-QFN (5x5) footprint.
Drop-in alternatives for LTC2341HUH-18 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC2341HUH-18 (same form factor and footprint) — differing in Package, Input Type, Digital Interface, CMOS Output Lanes, Input Range (SoftSpan).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2341HUH-16
✅ Drop-In✓ In Stock
$21.75 / Unit
View Datasheet →LTC2341IUH-18
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2341HUH-18#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2353-18
✅ Drop-In📋 Reference alternative (not in catalog)
AD7606BBSTZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8912BRGER
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2341HUH-18 Maximum Ratings & Electrical Characteristics
| Number of Bits | 18 |
| Sampling Rate (per channel) | 666 ksps |
| Number of Channels | 2 (simultaneous sampling) |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Differential, wide common-mode range |
| Input Range (SoftSpan) | ±10.24 V / 0 V to 10.24 V (per channel, independent) |
| Analog Supply Voltage | 4.75 V to 5.25 V |
| Digital Supply Voltage | 4.75 V to 5.25 V |
| Internal Reference | 2.5 V (with buffer, integrated) |
| Digital Interface | Pin-selectable SPI CMOS (1.8 V to 5 V) or LVDS |
| Data Output Width (CMOS mode) | 1 or 2 lanes (pin-selectable) |
| Operating Temperature Range | -40 C to +125 C |
| Package | 32-QFN (5 mm x 5 mm) with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
LTC2341HUH-18 Pin Configuration
| Pin 1 | AIN0+ — Channel 0 positive differential analog input |
| Pin 2 | AIN0- — Channel 0 negative differential analog input |
| Pin 3 | AIN1+ — Channel 1 positive differential analog input |
| Pin 4 | AIN1- — Channel 1 negative differential analog input |
| Pin 5 | GND — Analog ground |
| Pin 6 | REF — 2.5V reference output / external reference input |
| Pin 7 | REFBUF — Internal reference buffer output |
| Pin 8 | AVDD — 5V analog supply |
| Pin 9 | OVDD — Digital I/O supply (1.8V to 5V) |
| Pin 10 | DVDD — 5V digital supply |
| Pin 11 | GND — Digital ground |
| Pin 12 | CNV — Conversion start input |
| Pin 13 | BUSY — Conversion busy output |
| Pin 14 | SCK — Serial clock input |
| Pin 15 | SDO1 — Serial data output 1 (CMOS mode) |
| Pin 16 | SDO2 — Serial data output 2 (CMOS mode / LVDS+) |
| Pin 17 | SCKI — Internal/external clock select |
| Pin 18 | MODE — Interface mode select (CMOS / LVDS) |
| Pin 19 | RST — Reset input |
| Pin 20 | RD — Read input for parallel-style data framing |
| Pin 21 | CS — Chip select |
| Pin 22 | LVDS/CMOS — Interface pin-select |
| Pin 23 | IN0R — Channel 0 input range select (SoftSpan) |
| Pin 24 | IN1R — Channel 1 input range select (SoftSpan) |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | NC — Not connected (per datasheet) |
| Pin 29 | NC — Not connected (per datasheet) |
| Pin 30 | NC — Not connected (per datasheet) |
| Pin 31 | NC — Not connected (per datasheet) |
| Pin 32 | EP — Exposed pad - connect to AGND for thermal dissipation |
Typical Applications
LTC2341HUH-18 is suitable for 6 applications: Industrial Process Control & PLC Analog Input Modules, Automatic Test Equipment (ATE) & Instrumentation, Multi-Channel Data Acquisition (DAQ) Systems, Precision Medical Instrumentation, Polyphase Power & Vibration Analysis, Sonar & Acoustic Beamforming Front-Ends.
Industrial Process Control & PLC Analog Input Modules
The LTC2341HUH-18 is ideal for industrial process control and PLC analog input modules because its simultaneous sampling across two channels preserves the phase coherence of multi-sensor signals (voltage, current, temperature) read at the same instant. The SoftSpan ±10.24 V input range directly digitizes industrial ±10 V transducer outputs without external scaling resistors, while the 666 kSPS/ch throughput captures fast control loop dynamics. Each channel can be configured to a different range on the fly, allowing one module to accept mixed-signal inputs (e.g. 4-20 mA loop current via shunt, ±10 V position sensor) without hardware changes. The 32-QFN (5x5) footprint fits compact DIN-rail-mounted analog boards, and the pin-selectable interface connects equally well to legacy 5 V microcontrollers and modern 1.8 V SoCs used in next-generation PLCs.
Recommended
Automatic Test Equipment (ATE) & Instrumentation
The LTC2341HUH-18 suits ATE and instrumentation with its 18-bit resolution, 666 kSPS/ch throughput and true differential inputs that reject common-mode noise from the DUT. Simultaneous dual-channel sampling allows synchronized measurement of stimulus-response pairs, while the SoftSpan input range lets one ADC digitize both high-voltage (e.g. ±10 V) and low-voltage (e.g. ±2.56 V) signals without front-end reconfiguration. The pin-selectable LVDS interface keeps emissions low in dense ATE racks; the integrated 2.5 V reference and buffer reduce BOM cost and board area for multi-channel source-measure units (SMU) and data-acquisition (DAQ) cards.
Recommended
Multi-Channel Data Acquisition (DAQ) Systems
Multi-channel data acquisition systems leverage the LTC2341HUH-18's dual simultaneous-sampling channels to double channel density per PCB area versus single-channel ADCs, with the 32-QFN (5x5) footprint allowing up to 4 channels per square inch of board space. The wide ±10.24 V common-mode input range tolerates ground potential differences between remote sensors, while the LVDS interface option supports long backplane traces and high channel counts without EMI issues. Integrated reference and reference buffer reduce complexity and BOM cost in compact DAQ modules for structural-health, vibration, and acoustic instrumentation, where phase-coherent multi-channel data is essential.
Recommended
Precision Medical Instrumentation
Precision medical instrumentation benefits from the LTC2341HUH-18's true differential 18-bit resolution and simultaneous dual-channel sampling, which preserve phase coherence when digitizing paired biosignals such as ECG leads, EEG channels, or differential pressure/flow sensor outputs. The ±10.24 V SoftSpan input range accepts the full output span of medical sensor front-ends without external scaling, while the integrated low-drift reference and buffer ensure long-term calibration stability required by IEC 60601 medical electrical equipment standards. The 32-QFN (5x5) thermally-enhanced package keeps self-heating low in patient-worn or bedside monitoring equipment, and the pin-selectable CMOS/LVDS interface integrates easily with low-power medical-grade SoCs.
Recommended
Polyphase Power & Vibration Analysis
Polyphase power analysis and vibration monitoring require simultaneous multi-channel sampling to compute per-phase energy, harmonics, and modal frequencies without inter-channel timing skew. The LTC2341HUH-18 samples both channels at the same instant at up to 666 kSPS/ch, eliminating the phase error that multiplexed ADCs introduce. The SoftSpan inputs directly accept current-transformer (CT) and voltage-transducer outputs in the ±10.24 V range, while the integrated reference simplifies calibration across multi-phase power meters. For vibration analysis of rotating machinery, the synchronized channels compute cross-channel spectral relationships needed for modal analysis and fault detection.
Recommended
Sonar & Acoustic Beamforming Front-Ends
Sonar and acoustic beamforming arrays demand tightly-synchronized multi-channel acquisition to compute inter-channel phase for beam steering and target localization. The LTC2341HUH-18's simultaneous-sampling dual-channel architecture supports compact hydrophone-array front-ends with 32-QFN (5x5) packaging allowing high channel density per square centimeter of array PCB. The differential ±10.24 V input range accommodates preamp outputs directly, and the LVDS interface option supports the long, noise-immune data traces required between the array and the beamforming processor in underwater acoustic instrumentation.
Recommended
Recommended Products Summary
Engineering reference data for LTC2341HUH-18 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2341HUH-16 | LTC2341IUH-18 | LTC2341HUH-18#PBF | LTC2353-18 | AD7606BBSTZ | ADS8912BRGER |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | 32-QFN (5x5) | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same |
| Resolution | 18 bits | 16 bits (-2 bits) | 18 bits | 18 bits | 18 bits | 16 bits (-2 bits) | 20 bits (+2 bits) |
| Number of Channels | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) | 1 (single) | 8 (simultaneous) | 1 (single) |
| Sampling Rate per Channel | 666 kSPS | 666 kSPS | 666 kSPS | 666 kSPS | 550 kSPS (-17%) | 200 kSPS (-70%) | 1 MSPS (+50%) |
| Input Range | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±25 V true bipolar | ±10 V / ±20 V | ±5 V unipolar |
| Digital Interface | CMOS/LVDS, 1.8V-5V | CMOS/LVDS, 1.8V-5V | CMOS/LVDS, 1.8V-5V | CMOS/LVDS, 1.8V-5V | Parallel CMOS | Parallel/Serial CMOS | SPI CMOS |
| Internal Reference | 2.5 V with buffer (integrated) | 2.5 V with buffer | 2.5 V with buffer | 2.5 V with buffer | External only | Internal 2.5 V | External only |
Key Differentiators
- True simultaneous dual-channel sampling at 666 kSPS/ch (vs AD7606BBSTZ)
- Integrated 2.5 V reference with reference buffer (vs ADS8912BRGER)
- Wide bipolar SoftSpan input range ±10.24 V (vs ADS8912BRGER)
Design Notes
Place a 10 uF X7R ceramic decoupling capacitor immediately at each of the AVDD, DVDD, and OVDD pins of the LTC2341HUH-18, with the loop area minimized to reduce switching noise injection. Add a 0.1 uF X7R bypass cap in parallel for high-frequency decoupling. A ferrite bead between AVDD and the upstream 5 V LDO is recommended for noisy digital environments. Estimated: total decoupling budget for the 32-QFN footprint is approximately 30 uF (10 uF x 3 rails).
Route the differential analog inputs (AIN0+/AIN0-, AIN1+/AIN1-) as tightly-coupled symmetrical pairs with characteristic impedance matching; the LTC2341HUH-18 datasheet specifies matched pair lengths to preserve common-mode rejection at full throughput. Use a star-ground topology: tie the exposed thermal pad to a quiet analog ground pour directly under the IC, and avoid routing digital return currents through the analog ground. Estimated: differential pair length mismatch tolerance should be less than 1 mm per 100 mm of run length for datasheet CMRR.
The LTC2341HUH-18 exposed pad (pin 32) must be soldered to the PCB ground for rated thermal and electrical performance; failure to do so can cause overheating and degraded SNR. The SoftSpan input range bits (IN0R/IN1R) must be configured before conversion start and held stable during conversion - changing them mid-conversion yields invalid data. The reference output (REF) requires a 10 uF external decoupling cap; do not omit it or the reference buffer may oscillate.
Compliance Information
RoHS compliant per ADI product page (#PBF suffix confirms lead-free). Not AEC-Q100 qualified - choose AEC-Q100 qualified ADCs (such as AD7606BSTZ variants) for automotive applications. Halogen-free per ADI product documentation.
