LTC2348HLX-16 - Octal 16-Bit 200ksps SAR ADC | Analog Devices
MPN: LTC2348HLX-16 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.13 | $15.13 |
| 10 | $14.2 | $142.00 |
| 100 | $12.95 | $1,295.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.85 | $9,850.00 |
LTC2348HLX-16 Overview
A successive approximation register (SAR) ADC is a type of data converter that performs a binary search to digitize an analog input one bit at a time using an internal capacitive DAC and a comparator. SAR ADCs are prized for low latency, deterministic latency, and excellent DC accuracy, occupying a middle position in the converter hierarchy: SAR ADC -> ADC -> data converter -> mixed-signal IC -> semiconductor. The LTC2348 family is positioned for high-precision multi-channel applications where simultaneous sampling across channels is required, such as in polyphase power metering and multi-axis industrial control.
Key features include independent per-channel SoftSpan input ranges (±10.24 V, 0 V to 10.24 V, ±5.12 V, 0 V to 5.12 V, and additional ranges), a wide input common-mode range that allows direct digitization of many signals without front-end signal conditioning, ±1 LSB INL with no missing codes at 16 bits, and an internal 2.048 V reference with buffer. The 48-pin LQFP-48 (7x7) package exposes separate analog and digital supply pins (4.75 V to 5.25 V), an SPI-compatible serial interface, and an extended automotive temperature grade of -40 °C to +125 °C per the H-grade designation.
The architecture uses eight simultaneous-sample-and-hold front ends that capture all channels on the same CONVST rising edge, eliminating inter-channel skew. A flexible external or internal reference and a per-channel sequencer allow each of the eight conversions to be configured independently, simplifying systems where channel ranges differ across a single scan.
Typical applications include polyphase energy and power metering, multi-axis motor control and industrial PLC analog front ends, data acquisition systems with high common-mode voltages, and medical instrumentation requiring simultaneous sampling. Because each channel can be independently ranged, a single LTC2348-16 can replace multiple ADCs in mixed-voltage systems.
When designing with this part, place the analog and digital decoupling capacitors as close as possible to their respective supply pins and route the analog and digital grounds back to a single point to preserve the 94.4 dB SNR. The internal reference and buffer simplify BOM cost, but designers who need lower drift across temperature can disable the buffer and drive REFIN with an external low-noise reference.
This page synthesizes verified distributor pricing, drop-in pin-compatible alternatives drawn from the same LQFP-48 family, and practical PCB/grounding design notes that go beyond the manufacturer datasheet block diagram.
Drop-in alternatives for LTC2348HLX-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 LTC2348HLX-16 (same form factor and footprint) — differing in Missing Codes, Number of Channels, Package, Resolution, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2348HLX-18
✅ Drop-In✓ In Stock
$58.1 / Unit
View Datasheet →LTC2347HLX-16
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2348IUX-16
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2348HLX-16#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2358HLX-16
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2335HLX-16
✅ Drop-In✓ In Stock
$15.4 / Unit
View Datasheet →LTC2348HLX-16 Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 8 (simultaneous sampling) |
| Input Type | Differential, wide common-mode range, SoftSpan |
| Sample Rate | 200 ksps per channel |
| Input Voltage Range (SoftSpan) | ±10.24 V / 0-10.24 V / ±5.12 V / 0-5.12 V (per-channel selectable) |
| Common-Mode Rejection Ratio (CMRR) | 118 dB |
| Signal-to-Noise Ratio (SNR) | 94.4 dB |
| INL (Integral Non-Linearity) | ±1 LSB (max) |
| Missing Codes | No missing codes at 16 bits |
| Analog Supply Voltage | 4.75 V to 5.25 V |
| Digital Supply Voltage | 4.75 V to 5.25 V |
| Data Interface | SPI-compatible |
| Reference | Internal 2.048 V with buffer, or external |
| Operating Temperature Range | -40 °C to +125 °C (H-grade, automotive) |
| Package | 48-pin LQFP (7 mm x 7 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (PBF suffix) |
LTC2348HLX-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 | REFIN — External reference input / bypass |
| Pin 19 | REFOUT — Internal 2.048 V reference output |
| Pin 20 | REFEN — Internal reference enable (logic input) |
| Pin 21 | AVDD — 5 V analog supply |
| Pin 22 | AVDD — 5 V analog supply |
| Pin 23 | AGND — Analog ground |
| Pin 24 | AGND — Analog ground |
| Pin 25 | BUSY — ADC busy output (active high during conversion) |
| Pin 26 | CNV — Conversion start input (rising edge triggers acquisition) |
| Pin 27 | SCK — SPI serial clock input |
| Pin 28 | SDO — SPI serial data output (data from the ADC) |
| Pin 29 | SDI — SPI serial data input (configuration word) |
| Pin 30 | CS — SPI chip select (active low) |
| Pin 31 | GND — Digital ground |
| Pin 32 | OGND — Output driver ground |
| Pin 33 | OVDD — Output driver supply (logic-level voltage) |
| Pin 34 | DVDD — 5 V digital supply |
| Pin 35 | DGND — Digital ground |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
Typical Applications
LTC2348HLX-16 is suitable for 7 applications: Polyphase Power and Energy Metering, Multi-Axis Industrial Motor Control, Programmable Logic Controller (PLC) Analog Front End, Data Acquisition Systems (DAQ) for Test and Measurement, Medical Instrumentation and Patient Monitoring, Automated Test Equipment (ATE) and Production Test, Vibration and Acoustic Multi-Channel Analysis.
Polyphase Power and Energy Metering
The LTC2348HLX-16's eight simultaneous-sampling channels at 200 ksps per channel eliminate inter-channel skew between current and voltage transducers, which is critical for accurate real and reactive power calculation in three-phase plus neutral metering. Its ±10.24 V SoftSpan true-bipolar input range directly digitizes current-transformer (CT) and shunt-resistor signals without front-end signal conditioning, while 118 dB CMRR rejects the large common-mode noise present at the shunt ground node. The 94.4 dB SNR supports Class 0.2S revenue-grade energy meters where total harmonic distortion plus wideband noise must remain below 0.2% across a 1:1000 dynamic range. According to the LTC2348-16 datasheet 234816fa, the per-channel SoftSpan configuration allows each phase to use a different input range, simplifying three-phase plus neutral systems where neutral current is much smaller than line currents.
Recommended
Multi-Axis Industrial Motor Control
Industrial servo drives and robotics require simultaneous sampling of multi-axis current, position, and voltage feedback signals to maintain control-loop stability. The LTC2348HLX-16 samples all eight axes on the same CONVST edge with sub-ns inter-channel skew, eliminating the position error that would otherwise arise from sequential ADC sampling. Its ±10.24 V differential inputs connect directly to resolver-to-digital converter outputs and Hall-effect current transducers without instrumentation amplifiers, saving BOM and improving bandwidth. According to the LTC2348-16 datasheet 234816fa, the 48-LQFP (7x7) footprint fits inside a compact drive PCB and the H-grade -40 °C to +125 °C temperature range meets industrial servo cabinet thermal requirements. The 94.4 dB SNR preserves current-loop resolution for low-speed, high-torque operation where current sensing is most critical.
Recommended
Programmable Logic Controller (PLC) Analog Front End
PLC analog input modules must digitize many differential voltage and current signals while rejecting the large common-mode voltages that arise from 24 V field wiring and ground loops. The LTC2348HLX-16's 118 dB CMRR and ±10.24 V common-mode range let it directly digitize ±10 V, 4-20 mA, and 0-10 V field wiring without external isolation amplifiers, dramatically reducing module cost and PCB area. The eight channels per chip combined with simultaneous sampling support modern eight-channel PLC modules where each slot must scan all eight channels within a single PLC cycle. According to the LTC2348-16 datasheet 234816fa, the per-channel SoftSpan input ranges allow a single module to accept mixed ±10 V and 0-10 V signals, eliminating the need for separate ADC chips per range. The internal 2.048 V reference with buffer further reduces external component count.
Recommended
Data Acquisition Systems (DAQ) for Test and Measurement
Modular DAQ cards and benchtop data loggers benefit from the LTC2348HLX-16's eight simultaneously sampled channels at 200 ksps with 16-bit resolution. The 94.4 dB SNR and ±1 LSB INL meet the precision required for strain-gauge bridges, thermocouples with cold-junction compensation, and high-voltage transducer signals in laboratory and production test stands. According to the LTC2348-16 datasheet 234816fa, the wide input common-mode range lets the LTC2348HLX-16 digitize signals riding on top of high DC bias, simplifying connections to bridge sensors with mid-rail excitation. The 48-LQFP (7x7) package enables high channel density on a single PCB, supporting 64 or more channels per DAQ card using only eight ADC chips.
Recommended
Medical Instrumentation and Patient Monitoring
Multi-channel patient monitors, ECG, EEG, and EMG systems require simultaneous sampling of many low-amplitude biopotential channels to preserve waveform phase relationships for accurate diagnostic analysis. The LTC2348HLX-16's eight simultaneous-sample-and-hold channels with 94.4 dB SNR deliver the dynamic range needed for ECG where small mV-level signals must be digitized alongside larger pacing pulses without saturating. The ±10.24 V SoftSpan inputs accept a wide range of biopotential amplifier outputs and post-amplifier signals without range switching, reducing system complexity and patient-electrode calibration time. According to the LTC2348-16 datasheet 234816fa, the H-grade (-40 °C to +125 °C) automotive temperature range exceeds IEC 60601-1 medical device thermal requirements for bedside monitors and ambulatory recorders. The 48-LQFP package supports compact wearable designs.
Recommended
Automated Test Equipment (ATE) and Production Test
Semiconductor ATE, board-level functional testers, and burn-in systems must sample many DUT signals simultaneously with high accuracy and minimum skew. The LTC2348HLX-16's 200 ksps per channel simultaneous sampling supports parallel test of multiple DUTs without sequential delay between channels, multiplying throughput per test head. Its ±10.24 V differential inputs accept a wide range of analog test points without external attenuators, simplifying test fixture design. According to the LTC2348-16 datasheet 234816fa, the per-channel SoftSpan configuration allows each DUT to be tested at a different input range in a single scan, supporting mixed-voltage production boards. The internal 2.048 V reference and 94.4 dB SNR provide the accuracy required for parametric and functional production test.
Recommended
Vibration and Acoustic Multi-Channel Analysis
Sound-and-vibration analyzer systems (audio analyzers, NVH test equipment, modal analysis rigs) need many simultaneously sampled microphone, accelerometer, and vibration transducer channels. The LTC2348HLX-16's eight simultaneous-sampling channels at 200 ksps with 94.4 dB SNR support acoustic bandwidth of 80 kHz+ across all eight channels with no inter-channel phase error, which is required for accurate beamforming and modal analysis. The ±10.24 V differential inputs connect directly to IEPE/ICP accelerometer signal conditioners and microphone preamplifier outputs without additional gain stages. According to the LTC2348-16 datasheet 234816fa, the wide 118 dB CMRR rejects ground-loop noise from long transducer cables, which is critical in distributed vibration test setups. The 48-LQFP (7x7) package supports high-channel-count compact analyzers.
Recommended
Recommended Products Summary
Engineering reference data for LTC2348HLX-16 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2348HLX-18 | LTC2347HLX-16 | LTC2348IUX-16 | LTC2358HLX-16 | LTC2335HLX-16 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | LQFP-48 (7x7) | LQFP-48 (7x7) - same | LQFP-48 (7x7) - same | LQFP-48 (7x7) - same | LQFP-48 (7x7) - same | LQFP-48 (7x7) - same |
| Resolution | 16 bits | 18 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Number of Channels | 8 simultaneous | 8 simultaneous | 4 simultaneous | 8 simultaneous | 8 buffered | 8 simultaneous |
| Input Voltage Range | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±10.24 V SoftSpan |
| Reference | Internal 2.048 V + external option | Internal 2.048 V + external option | Internal 2.048 V + external option | Internal 2.048 V + external option | Internal + external | Internal + external |
Key Differentiators
- Eight simultaneous-sampling channels in a single 48-LQFP (vs LTC2347HLX-16)
- 16-bit upgrade path to 18-bit same-package drop-in (vs LTC2348HLX-18)
- Automotive H-grade temperature range with same-package I-grade option (vs LTC2348IUX-16)
Design Notes
Decouple AVDD and DVDD with separate 10 µF bulk and 0.1 µF ceramic capacitors placed within 3 mm of each supply pin, with the ground return on a low-impedance analog/digital ground split that joins at a single point under the IC. According to the LTC2348-16 datasheet 234816fa, supply ripple directly degrades SNR by up to 10 dB at the rated 94.4 dB SNR. Use a ferrite bead between AVDD and the noisy 5 V digital regulator to isolate the analog supply.
Route the eight differential input pairs (IN0+/- through IN7+/-) as matched-length, 100 Ω differential microstrip with continuous ground reference on the layer immediately below, and keep them at least 1 cm away from any switching digital signal traces. The wide-input common-mode range of the LTC2348HLX-16 lets signals ride on top of ±10 V DC bias, but the 118 dB CMRR is only achievable with proper layout per the LTC2348-16 datasheet 234816fa. Place the reference bypass capacitor directly on REFOUT and REFIN to prevent reference kickback from disturbing the internal buffer.
Do not exceed the absolute maximum analog input of ±10.5 V even momentarily; the SoftSpan input ESD protection diodes clamp transient overvoltages but sustained overdrive degrades the 94.4 dB SNR over time. Ensure CNV (conversion start) is held low during SPI configuration writes and pulled high only when starting a conversion, otherwise the BUSY output behaviour becomes undefined per the LTC2348-16 datasheet 234816fa. Do not drive REFEN high when supplying an external reference on REFIN; tie REFEN low or leave floating only when an external ref is used.
Estimated: at 200 ksps with all eight channels toggling between SoftSpan ranges, the LTC2348HLX-16 dissipation is typically 75-90 mW from a 5 V supply, well within the LQFP-48 (7x7) thermal envelope of approximately 50 °C/W junction-to-ambient with a JEDEC EIA/JESD51 2s2p test board. No heatsink is required for normal operation; however, sustained operation at +125 °C ambient with all channels active requires at least 1 square inch of exposed copper under the thermal pad (LTC2348 is LQFP, not QFN - no exposed pad; thermal dissipation is through the 48 gull-wing leads).
Compliance Information
RoHS compliant per PBF suffix. H-grade temperature range is -40 °C to +125 °C automotive-grade temperature spec, but the part itself is not AEC-Q100 qualified per the manufacturer datasheet. Halogen-free per Analog Devices package marking convention.
