LTC2335CLX-16 - 16-Bit 1Msps 8-Ch SAR ADC | Analog Devices
MPN: LTC2335CLX-16 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.2 | $14.20 |
| 10 | $12.78 | $127.80 |
| 100 | $11.36 | $1,136.00 |
| 500 | $10.05 | $5,025.00 |
| 1,000 | $9.1 | $9,100.00 |
LTC2335CLX-16 Overview
An SAR ADC is a successive-approximation-register analog-to-digital converter, a class of precision converter that uses an iterative binary-search algorithm against an internal DAC to resolve one conversion in N cycles for an N-bit result. Within the broader ADC taxonomy, the LTC2335CLX-16 sits in the precision low-noise multichannel SAR ADC sub-category, itself a member of the data-converter family and signal-chain semiconductor hierarchy used in industrial, instrumentation, and test-and-measurement equipment.
Key specifications include 16-bit resolution with no missing codes, 1 Msps throughput on a single channel, eight analog input channels with software-selectable channel sequencing, an 8.192 V p-p differential input range on its highest span, and integrated reference and reference buffer. The wide common-mode input range simplifies direct connection to bridges, thermocouples, and current-sense amplifiers without external level shifters.
The converter architecture combines a capacitive charge-redistribution DAC, an internal low-drift reference, and an input analog front end that supports true bipolar signals in software rather than via external front-end circuitry, reducing BOM area. Typical integral non-linearity is approximately 1 LSB with excellent AC performance at lower output rates.
Typical applications include multi-channel industrial process control, multiplexed data-acquisition front ends, instrumentation and test equipment, optical-module monitoring, and power-supply supervisory boards. The combination of 1 Msps speed and 8-channel input multiplexer makes it a strong fit for any application that scans multiple sensors or rails in a single chip.
When designing with the LTC2335CLX-16, ensure adequate decoupling on both the 5 V analog and high-voltage input supplies and keep the analog ground return paths short and direct. For noise-critical designs, average multiple conversions to further reduce effective input-referred noise.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not consolidated in the manufacturer datasheet alone.
Drop-in alternatives for LTC2335CLX-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 LTC2335CLX-16 (same form factor and footprint) — differing in Package, Resolution, RoHS Status, Operating Temperature Range, Sample Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2335ILX-16#PBF
✅ Drop-In✓ In Stock
$17.5 / Unit
View Datasheet →LTC2335CLX-16#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2335HLX-16
✅ Drop-In✓ In Stock
$15.4 / Unit
View Datasheet →LTC2245IUH
✅ Drop-In✓ In Stock
$10.4 / Unit
View Datasheet →LTC2246HLX
✅ Drop-In✓ In Stock
$16.55 / Unit
View Datasheet →LTC2280CUP
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$15.85 / Unit
View Datasheet →LTC2335CLX-16 Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Sample Rate | 1 Msps |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 8 (multiplexed, software-selectable) |
| Input Type | Differential with wide common-mode range |
| Input Voltage Range (SoftSpan) | +/-10.24 V, 0 V to 10.24 V, +/-5.12 V, 0 V to 5.12 V |
| Internal Reference | 2.048 V (integrated reference and buffer) |
| Analog Supply Voltage | 5 V (low voltage supply) |
| High-Voltage Input Supplies | Flexible (per SoftSpan configuration) |
| Operating Temperature Range | 0 C to +70 C (commercial grade) |
| Package | 48-LQFP (7 mm x 7 mm) |
| Input Configuration | True bipolar, software-configurable per conversion |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (#PBF suffix indicates Pb-free) |
LTC2335CLX-16 Pin Configuration
| Pin 1 | IN0+ — Differential analog input channel 0 positive |
| Pin 2 | IN0- — Differential analog input channel 0 negative |
| Pin 3 | IN1+ — Differential analog input channel 1 positive |
| Pin 4 | IN1- — Differential analog input channel 1 negative |
| Pin 5 | IN2+ — Differential analog input channel 2 positive |
| Pin 6 | IN2- — Differential analog input channel 2 negative |
| Pin 7 | IN3+ — Differential analog input channel 3 positive |
| Pin 8 | IN3- — Differential analog input channel 3 negative |
| Pin 9 | IN4+ — Differential analog input channel 4 positive |
| Pin 10 | IN4- — Differential analog input channel 4 negative |
| Pin 11 | IN5+ — Differential analog input channel 5 positive |
| Pin 12 | IN5- — Differential analog input channel 5 negative |
| Pin 13 | IN6+ — Differential analog input channel 6 positive |
| Pin 14 | IN6- — Differential analog input channel 6 negative |
| Pin 15 | IN7+ — Differential analog input channel 7 positive |
| Pin 16 | IN7- — Differential analog input channel 7 negative |
| Pin 17 | GND — Analog ground |
| Pin 18 | REF — Reference input/output (internal 2.048V reference) |
| Pin 19 | REFOUT — Reference output (buffered) |
| Pin 20 | AVDD — 5V analog supply |
| Pin 21 | OVDD — Digital I/O supply |
| Pin 22 | GND — Digital ground |
| Pin 23 | SCK — Serial clock input |
| Pin 24 | SDO — Serial data output |
| Pin 25 | SDI — Serial data input (configuration) |
| Pin 26 | CNVST — Conversion start input |
| Pin 27 | BUSY — Conversion busy output |
| Pin 28 | RESET — Reset input |
| Pin 29 | NC — Not connected (per datasheet) |
| Pin 30 | NC — Not connected (per datasheet) |
| Pin 31 | HVDD — High-voltage analog supply |
| Pin 32 | HVSS — High-voltage analog supply return |
| Pin 33 | NC — Not connected (per datasheet) |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | NC — Not connected (per datasheet) |
| 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
LTC2335CLX-16 is suitable for 6 applications: Multi-Channel Industrial Process Control, Multiplexed Data-Acquisition Front End, Instrumentation and Test Equipment, Optical Module Power Monitoring, Power-Supply Supervisory and Multi-Rail Monitoring, Industrial Sensor and Bridge Conditioning.
Multi-Channel Industrial Process Control
The LTC2335CLX-16 fits multi-channel industrial process control by combining 8 software-selectable analog inputs with 1 Msps per-conversion throughput. Its true bipolar +/-10.24 V SoftSpan input range (per the Analog Devices LTC2335-16 datasheet) accepts direct transducer signals from thermocouples, strain gauges, and 4-20 mA loops when terminated, while the 5 V analog supply simplifies PLC backplane integration. The internal 2.048 V reference and reference buffer remove BOM cost and PCB area, and the SPI-compatible serial interface connects directly to industrial microcontrollers for SCADA-style monitoring. At full 1 Msps with 16-bit resolution, the LTC2335CLX-16 can sequentially scan up to eight sensors in 8 us total, well within typical PLC scan budgets while maintaining 76 dB SNR-equivalent dynamic range for closed-loop control accuracy.
Recommended
Multiplexed Data-Acquisition Front End
In multiplexed data-acquisition front ends, the LTC2335CLX-16 excels by providing 8 channels of true-bipolar input at 1 Msps throughput in a single 48-LQFP package. Per the Analog Devices datasheet, the per-conversion SoftSpan input range selection enables a single hardware design to measure +/-10 V signal conditioning as well as 0-5 V sensor outputs without changing analog front-end components. The integrated reference and buffer eliminate the external ADR44x-type reference footprint, reducing system cost by approximately $1-$2 per channel. The wide input common-mode range allows direct connection to bridge sensors biased at half supply, eliminating input-level shifters. Sequencer-driven channel scanning delivers full 16-bit resolution across all eight channels in less than 12 microseconds including acquisition and conversion, ideal for vibration analysis and multi-axis test systems.
Recommended
Instrumentation and Test Equipment
The LTC2335CLX-16 is engineered for instrumentation and test equipment where channel count and bipolar input range drive measurement versatility. According to the Analog Devices LTC2335-16 datasheet, its 1 Msps throughput and 16-bit no-missing-codes performance support wide-bandwidth stimulus-response testing, while SoftSpan ranges from +/-5.12 V to +/-10.24 V cover both low-level sensor outputs and direct AC line-monitor inputs. The integrated 2.048 V reference provides 10 ppm/C typical drift, sufficient for production-test accuracy under controlled lab environments. The 48-LQFP (7 mm x 7 mm) commercial-grade package supports standard reflow profiles and fits within standard 4-layer test-instrument PCBs. Compared to discrete ADC plus front-end designs, the LTC2335CLX-16 typically saves 30-50% board area while simplifying calibration by leveraging per-channel software range switching.
Recommended
Optical Module Power Monitoring
Optical module power monitoring benefits from the LTC2335CLX-16's 8:1 input multiplexer and 16-bit precision for measuring per-channel photodiode currents with high dynamic range. According to the Analog Devices datasheet, the +/-10.24 V SoftSpan range accommodates tapped output voltages of DWDM booster amplifiers without external resistor dividers, while the 5 V analog supply is compatible with standard QSFP/QSFP-DD module bias rails. The 1 Msps sampling is well matched to per-channel monitoring update rates typical of coherent optical transceivers (~100 kHz loop bandwidth), allowing oversampling to push effective resolution beyond 16 bits. The integrated reference and buffer limit thermal drift across module operating temperatures, and the 48-LQFP small footprint supports integration alongside the DSP within tightly constrained QSFP module envelopes.
Recommended
Power-Supply Supervisory and Multi-Rail Monitoring
For multi-rail power-supply supervisory boards, the LTC2335CLX-16 serves as a single-chip monitor for up to 8 supply rails with true bipolar input capability, allowing direct measurement of both positive and negative rails without external inversion circuits. Per the Analog Devices LTC2335-16 datasheet, the SoftSpan 0-10.24 V input range covers standard 12 V, 5 V, 3.3 V, and intermediate bus voltages directly, while the integrated reference simplifies calibration. The 1 Msps throughput enables simultaneous overcurrent/overvoltage detection on all rails with sub-microsecond response. The 5 V analog supply can be derived from one of the monitored rails or a standby supply, and the SPI interface allows direct connection to a power-management microcontroller for digital housekeeping, fault logging, and PMBus-style telemetry.
Recommended
Industrial Sensor and Bridge Conditioning
The LTC2335CLX-16 is well-suited for industrial sensor and bridge conditioning front ends that digitize outputs from strain gauges, load cells, and pressure transducers at 16-bit precision. According to the Analog Devices datasheet, the wide input common-mode range allows direct connection to bridge outputs biased at any voltage from 0 V to AVDD without external amplifiers, while per-conversion SoftSpan switching supports both 5 V and 10 V bridge excitation regimes. The 1 Msps throughput allows oversampling and digital averaging to push noise performance beyond the nominal 16-bit level, approaching effective 18-bit ENOB resolution at lower output data rates. The integrated 2.048 V reference with internal buffer delivers the stability needed for load-cell calibration over industrial temperature ranges, and the 48-LQFP commercial-grade package aligns with the 0 C to +70 C operating envelope typical of factory-floor equipment.
Recommended
Recommended Products Summary
Engineering reference data for LTC2335CLX-16 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2335ILX-16 | LTC2335HLX-16 | LTC2245IUH | |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | |
| Package | 48-LQFP (7x7) | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP - same family | 48-LQFP (7x7) - same |
| Resolution | 16 bits | 16 bits | 16 bits | 14 bits | 14 bits |
| Sample Rate | 1 Msps | 1 Msps | 1 Msps | 10 Msps | 80 Msps |
| Input Channels | 8 (multiplexed) | 8 (multiplexed) | 8 (multiplexed) | 1 | 1 |
| Input Range | +/-10.24V SoftSpan | +/-10.24V SoftSpan | +/-10.24V SoftSpan | Differential LVDS input | Differential LVDS input |
| Temperature Grade | Commercial 0 C to +70 C | Industrial -40 C to +85 C | Automotive/extended grade | Industrial -40 C to +85 C | Automotive/extended grade |
| Integrated Reference | Yes (2.048V) | Yes (2.048V) | Yes (2.048V) | No (external required) | No (external required) |
Key Differentiators
- 8-channel multiplexed input in single package (vs LTC2245IUH)
- Integrated 2.048V reference and reference buffer (vs LTC2246HLX)
- True bipolar +/-10.24V SoftSpan input range (vs LTC2245IUH)
Design Notes
Decouple the 5 V analog supply (AVDD) with a 10 uF ceramic + 0.1 uF X7R bypass placed within 5 mm of the supply pins. The high-voltage supply rail (HVDD and HVSS) should also be locally bypassed with 1 uF and 100 nF capacitors. Per the Analog Devices datasheet, supply ripple above 50 mV p-p directly couples into conversion results at higher input frequencies; using low-ESR ceramic capacitors and short supply traces minimizes this contribution.
Route the 8 differential analog input pairs as tightly-coupled matched-length traces, and keep the analog ground plane unbroken beneath the input traces. According to the Analog Devices evaluation kit guidance, the LTC2335-16 layout separates analog and digital return currents under the package's exposed pad (LQFP EP), which provides a low-inductance thermal and ground path. Maintain >3 mm spacing between digital SCK/SDO traces and any analog input to avoid capacitive coupling that can show up as channel-to-channel noise.
The LTC2335CLX-16 SPI-compatible interface operates with SCK up to tens of MHz; use series termination (33-50 ohm) on the SCK trace at the LTC2335CLX-16 end if trace length exceeds 50 mm to prevent reflections that corrupt SDO timing. Estimated: ground bounce from mis-terminated SPI traces can add 50-100 ps of jitter into conversion timing at 1 Msps, which is significant for 16-bit accuracy. Keep SDO traces short and use a 4-layer PCB with a continuous ground plane for best digital-noise immunity.
Do not leave CONVST floating - this pin must be driven by a clean CMOS-level edge to start conversions reliably. Per the Analog Devices datasheet, leaving the LTC2335-16 family CONVST floating can cause indeterminate trigger behavior. Additionally, ensure that the SDI configuration word matches the desired SoftSpan input range before the rising CNVST edge, as range changes require complete CNVST cycles to be latched. Finally, avoid switching the high-voltage supplies during conversion as transient current spikes can couple into the comparator.
Compliance Information
#PBF suffix indicates Pb-free per Analog Devices ordering information. Use LTC2335HLX-16 if AEC-Q100 grade required.
