LTC2348CLX-16 - Octal 16-Bit 200ksps SAR ADC | Analog Devices
MPN: LTC2348CLX-16 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $34.8 | $348.00 |
| 100 | $30.95 | $3,095.00 |
| 500 | $27.2 | $13,600.00 |
| 1,000 | $24.5 | $24,500.00 |
LTC2348CLX-16 Overview
A successive approximation register ADC is a precision data converter architecture that performs a binary search on the input voltage using a high-precision DAC and comparator to produce a digital code in N conversion cycles for N bits of resolution. SAR ADCs are valued for low latency, no pipeline delay, excellent DC accuracy, and inherent per-sample determinism, which makes the LTC2348 family particularly well suited to multi-channel data-acquisition systems where eight channels must be sampled synchronously to preserve phase and amplitude relationships. SoftSpan further extends the architecture by allowing each channel's input range to be reconfigured cycle-by-cycle to one of several software-selectable spans.
Key specifications include 16-bit resolution with no missing codes, +/-1LSB INL (max), 94.4dB SNR, and 200ksps throughput per channel on all eight channels simultaneously. The differential wide-common-mode input structure supports +/-10.24V true bipolar signals when paired with the appropriate high-voltage supply, and the device provides per-channel input span reconfiguration for mixed-range acquisition. Integrated reference and buffer simplify the analog supply tree and reduce external BOM.
In multi-channel industrial applications, the simultaneous-sampling SAR topology captures all eight channels in lock-step with sub-microsecond aperture timing, eliminating inter-channel skew that would otherwise corrupt phase-sensitive measurements. Designers can pair the converter with an FPGA or DSP for digital signal processing, and leverage the SoftSpan range reconfiguration to mix high-level and low-level sensors on a single ADC chip.
When laying out the PCB, keep analog input traces short and symmetric, place the internal reference decoupling capacitor close to the REF pin, and provide a solid ground plane under the LQFP body. Use a dedicated low-noise LDO for the 5V analog rail and isolate it from digital switching supplies to preserve the 94.4dB SNR. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for both selection and design-in guidance.
Drop-in alternatives for LTC2348CLX-16 — 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 LTC2348CLX-16 (same form factor and footprint) — differing in Input Type, Internal Reference, Number of Channels, Operating Temperature Range, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2348ILX-16#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2348HLX-16#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2348CLX-18#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2348CLX-14#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2344CUH-18
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$18.2 / Unit
View Datasheet →LTC2348CLX-16 Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices (formerly Linear Technology) |
| Part Number | LTC2348CLX-16 |
| Resolution | 16 bit |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 8 (simultaneous sampling) |
| Sampling Rate (per channel) | 200 ksps |
| Input Type | Differential, wide common-mode range, SoftSpan |
| Input Common-Mode Range | Wide (supports +/-10.24V true bipolar with HiV supply) |
| CMRR | 118 dB |
| INL (max) | +/-1 LSB |
| Missing Codes | No missing codes at 16 bits |
| SNR | 94.4 dB |
| Analog Supply Voltage | 5 V (low voltage analog supply) |
| High-Voltage Supply | Flexible (per SoftSpan configuration) |
| Internal Reference | Yes (integrated) |
| Internal Buffer | Yes (integrated) |
| Package | 48-pin LQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | 0C to +70C (C grade) |
| Temperature Grade | Commercial |
| Terminal Form | Gull Wing |
| RoHS Status | Compliant (PBF suffix indicates Pb-free) |
LTC2348CLX-16 Pin Configuration
| Pin 1 | IN0+ — Differential analog input 0, positive |
| Pin 2 | IN0- — Differential analog input 0, negative |
| Pin 3 | IN1+ — Differential analog input 1, positive |
| Pin 4 | IN1- — Differential analog input 1, negative |
| Pin 5 | IN2+ — Differential analog input 2, positive |
| Pin 6 | IN2- — Differential analog input 2, negative |
| Pin 7 | IN3+ — Differential analog input 3, positive |
| Pin 8 | IN3- — Differential analog input 3, negative |
| Pin 9 | IN4+ — Differential analog input 4, positive |
| Pin 10 | IN4- — Differential analog input 4, negative |
| Pin 11 | IN5+ — Differential analog input 5, positive |
| Pin 12 | IN5- — Differential analog input 5, negative |
| Pin 13 | IN6+ — Differential analog input 6, positive |
| Pin 14 | IN6- — Differential analog input 6, negative |
| Pin 15 | IN7+ — Differential analog input 7, positive |
| Pin 16 | IN7- — Differential analog input 7, negative |
| Pin 17 | GND — Analog ground |
| Pin 18 | REF — Reference output / reference buffer input |
| Pin 19 | REFBUF — Reference buffer output |
| Pin 20 | GND — Analog ground |
| Pin 21 | VDD — 5V analog low-voltage supply |
| Pin 22 | GND — Analog ground |
| Pin 23 | HVIN — High-voltage supply for input front-end |
| Pin 24 | GND — Analog ground |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | GND — Analog ground |
| Pin 28 | NC — Not connected (per datasheet) |
| Pin 29 | NC — Not connected (per datasheet) |
| Pin 30 | GND — Analog ground |
| Pin 31 | NC — Not connected (per datasheet) |
| Pin 32 | NC — Not connected (per datasheet) |
| Pin 33 | GND — Analog ground |
| Pin 34 | OVDD — Digital I/O supply |
| Pin 35 | GND — Digital ground |
| Pin 36 | SDO — Serial data output |
| Pin 37 | SDI — Serial data input |
| Pin 38 | SCK — Serial clock input |
| Pin 39 | CNVST — Conversion start input |
| Pin 40 | BUSY — Conversion busy output |
| Pin 41 | RD — Read input / data frame sync |
| Pin 42 | CS — Chip select input |
| Pin 43 | GND — Digital ground |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | GND — Thermal pad / analog ground |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
Typical Applications
LTC2348CLX-16 is suitable for 6 applications: Multi-Channel Industrial Data Acquisition, Power Line Monitoring and Protective Relay, Medical Multi-Channel Patient Monitoring, Vibration and Acoustic Test Instrumentation, Multi-Channel Industrial PLC Analog Input Module, Automotive Multi-Sensor Data Logger.
Multi-Channel Industrial Data Acquisition
The LTC2348CLX-16's eight simultaneously-sampled 16-bit channels make it a strong fit for multi-axis industrial DAQ systems that must capture eight sensor channels in lock-step without inter-channel skew. With 200 ksps per channel, +/-1LSB INL, and 118dB CMRR, the device digitizes mixed +/-10V, 0-5V, and 0-10V signals directly via its SoftSpan input ranges, eliminating external signal conditioning. The integrated reference and buffer cut BOM count, and the 48-LQFP package fits standard 4-layer data-acquisition boards. For a complete signal chain, pair this ADC with the AD8421 instrumentation amp for low-level sensors and an FPGA for digital post-processing.
Recommended
Power Line Monitoring and Protective Relay
Three-phase power monitoring and protective relay systems require synchronous sampling of voltage and current channels to compute instantaneous power, harmonics, and fault conditions. The LTC2348CLX-16's eight simultaneous-sampling channels (six for three-phase V/I plus two spares for neutral/dc link) and 200 ksps throughput support up to the 40th harmonic per channel under typical 50/60 Hz line-frequency sampling rules. Its 118dB CMRR rejects high common-mode dv/dt on the high-voltage bus, and the wide common-mode range directly digitizes current-transformer outputs via burden resistors. The 48-LQFP package and integrated reference simplify PCB layout in compact relay modules.
Recommended
Medical Multi-Channel Patient Monitoring
Multi-channel patient monitors (ECG, EEG, EMG, SpO2) demand simultaneous acquisition of several biopotential channels to preserve phase relationships for diagnostic algorithms. The LTC2348CLX-16 captures up to eight biopotential channels synchronously at 200 ksps per channel, with 94.4dB SNR preserving small-signal fidelity and 118dB CMRR rejecting 50/60 Hz mains interference and DC electrode offset. The differential wide-common-mode inputs accept both legacy +/-5V patient signals and modern 0-3.3V ASIC outputs on the same board. Designers pair this ADC with the AD822x instrumentation amp family and the ADuM315x isolated SPI for IEC 60601-1 compliant patient isolation.
Recommended
Vibration and Acoustic Test Instrumentation
Modal-analysis and structural-health-monitoring systems use multiple accelerometers whose phase relationships across vibration modes must be preserved. The LTC2348CLX-16's simultaneous-sampling eight channels and 200 ksps per channel support vibration analysis up to 80 kHz bandwidth per channel, well above typical structural modes. Its 118dB CMRR rejects ground loops from industrial test rigs, and the SoftSpan input reconfiguration lets one ADC handle both high-G shock sensors and low-G modal sensors on the same board. The internal reference eliminates external reference noise coupling, and the 48-LQFP package keeps the analog front-end compact on multi-channel IEPE conditioner boards.
Recommended
Multi-Channel Industrial PLC Analog Input Module
Programmable Logic Controller (PLC) analog input modules commonly require 4, 8, or 16 channels of 16-bit precision at moderate sample rates for process control loops. The LTC2348CLX-16 provides eight 16-bit simultaneously-sampled channels at 200 ksps per channel, exceeding the 100us settling requirements of typical 4-20mA and thermocouple input stages while preserving phase for multi-input control. The wide common-mode range directly accepts +/-10V field signals without resistor dividers, and the integrated reference plus SoftSpan input range reconfiguration reduces external BOM and calibration effort. The 48-LQFP (7x7) package fits standard PLC analog-input form factors, and the commercial temperature grade matches cabinet-internal operating conditions.
Recommended
Automotive Multi-Sensor Data Logger
Automotive data loggers (vehicle dynamics, ADAS sensor capture, HIL test rigs) require synchronous sampling of multiple sensor channels to correlate events across vehicle subsystems. The LTC2348CLX-16's eight channels at 200 ksps each simultaneously capture CAN-bus analog taps, wheel-speed sensors, accelerometers, and steering-angle sensors in phase. The 118dB CMRR rejects automotive common-mode noise from motors and 12V/48V bus switching, and the differential wide-common-mode inputs accept both 5V sensor outputs and legacy 12V analog signals directly. Designers typically follow this ADC with the ADuM3151 isolated interface and the LTC2348ILX-16 industrial-temperature variant for under-hood or chassis-mounted logger heads.
Recommended
Recommended Products Summary
Engineering reference data for LTC2348CLX-16 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2348ILX-16#PBF | LTC2348HLX-16#PBF | LTC2348CLX-18#PBF | LTC2348CLX-14#PBF |
|---|---|---|---|---|---|
| Package | 48-LQFP (7x7) | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit | 16 bit | 18 bit | 14 bit |
| Channels | 8 simultaneous | 8 simultaneous | 8 simultaneous | 8 simultaneous | 8 simultaneous |
| Sampling Rate | 200 ksps/ch | 200 ksps/ch | 200 ksps/ch | 200 ksps/ch | 200 ksps/ch |
| Temperature Grade | Commercial 0C to +70C | Industrial -40C to +85C | Commercial 0C to +70C | Commercial 0C to +70C | Commercial 0C to +70C |
| CMRR | 118 dB | 118 dB | 118 dB | 118 dB | 118 dB |
| Internal Reference | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- True 8-channel simultaneous sampling with sub-microsecond aperture matching (vs LTC2335HLX-16)
- Integrated precision reference and buffer eliminates external reference noise coupling (vs LTC2348ILX-16#PBF (same-die industrial variant))
- SoftSpan per-conversion input range reconfiguration (vs LTC2348CLX-18#PBF (same die, higher resolution))
Design Notes
Power the LTC2348CLX-16 from a dedicated ultra-low-noise LDO such as the LT3042 for the 5V VDD analog rail; switching regulators or shared digital LDOs inject noise that directly degrades SNR. Decouple VDD with 10uF + 0.1uF ceramic as close as practical to the VDD pin, and place a ferrite bead in series with any shared upstream rail. The high-voltage HVIN supply should come from a separate low-noise regulator and be bypassed with 10uF + 0.1uF at the pin.
Route the eight differential input pairs as tightly-matched length-matched traces with a solid ground reference plane underneath. Keep analog input traces short and away from digital switching lines (SCK, SDO, CNVST, BUSY); place a ground guard ring around the analog input pin cluster to reject digital crosstalk. Use a separate analog and digital ground island joined at a single point under the exposed pad of the LQFP to avoid ground-loop noise injection.
Do not exceed the HVIN high-voltage supply absolute maximum rating; verify with the SoftSpan input-range configuration table in the datasheet before applying field signals. Ensure the BUSY signal is monitored correctly: returning SCK edges while BUSY is high can cause double-counting and code-shift faults in the conversion result. Avoid loading the REF/REFBUF pins with more than the datasheet-specified bypass capacitance, which can cause reference buffer instability.
Estimated: at full 200 ksps on all 8 channels from a 5V analog rail, the LTC2348CLX-16 dissipates roughly 80-120 mW (estimated; verify with current measurement on the VDD pin in your application). The 48-LQFP (7x7) package provides adequate thermal relief at this power level on a 4-layer board with a small thermal pad footprint, but airflow or copper-pour area should be increased if the device is mounted inside a sealed enclosure with no convective cooling.
Compliance Information
RoHS compliant per '#PBF' suffix (Pb-free). Not AEC-Q100 qualified - C grade is commercial temperature only. REACH compliance per Analog Devices product statement; halogen-free status not explicitly stated in retrieved data.
