LTC2335ILX-16 - 16-Bit 1Msps 8-CH SAR ADC | Analog Devices
MPN: LTC2335ILX-16 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.8 | $168.00 |
| 100 | $15.2 | $1,520.00 |
| 500 | $13.75 | $6,875.00 |
| 1,000 | $12.4 | $12,400.00 |
LTC2335ILX-16 Overview
A SAR ADC is a successive approximation register analog-to-digital converter, a converter architecture that uses a binary-search algorithm against an internal DAC to resolve each sample in N clock cycles. SAR ADCs sit in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> signal chain IC. The LTC2335ILX-16 family specifically belongs to the multiplexed, high-impedance, wide-common-mode SoftSpan SAR ADC class designed for multi-channel data acquisition systems.
Key features include 16-bit resolution with no missing codes, 1 Msps throughput, 8 differential input channels with hardware or sequencer channel selection, per-channel input span switching via SoftSpan, integrated low-drift 2.048 V reference, integrated reference buffer, and a high-speed SPI-compatible serial interface. Internal channel-specific digital averaging modes reduce noise at the expense of throughput. Differential inputs support ±10.24 V true bipolar signals without external front-end signal conditioning.
The analog input structure uses charge-balancing switched-capacitor front ends per channel with shared reference and buffer, simplifying PCB layout when measuring multi-channel high-voltage signals. The internal reference and buffer eliminate external components for unipolar and bipolar spans. The SoftSpan interface reconfigures the input range on every conversion, allowing heterogeneous signal conditioning across channels at full 1 Msps aggregate throughput.
Typical applications include multi-channel industrial process control and data acquisition, programmable logic controller (PLC) analog input modules, automated test equipment (ATE) and instrumentation, power-line and motor-control voltage monitoring, and any multi-channel precision measurement requiring mixed bipolar and unipolar signal ranges. Designers favor this ADC when 8 differential channels, ±10 V true bipolar operation, and integrated reference reduce BOM and PCB area.
Design consideration: ensure the HV supply rail is sized for the largest programmed span; the 5 V low-voltage supply must be a low-noise LDO or ferrite-filtered switching regulator output. PCB layout should keep analog inputs short, symmetric, and routed over a continuous ground plane under the analog side of the IC.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, enabling faster component selection for multi-channel precision data-acquisition designs.
Drop-in alternatives for LTC2335ILX-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 LTC2335ILX-16 (same form factor and footprint) — differing in Operating Temperature Range, Package, Resolution, Interface, Internal Reference.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2335HLX-16
✅ Drop-In✓ In Stock
$15.4 / Unit
View Datasheet →LTC2335ILX-18
✅ Drop-In📋 Reference alternative (not in catalog)
AD7616BSTZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8556IPMR
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2335ILX-16 Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Conversion Rate | 1 Msps |
| Number of Input Channels | 8 (differential, multiplexed) |
| Architecture | Successive Approximation Register (SAR) |
| Input Voltage Span (SoftSpan) | ±10.24 V / 0-10.24 V / ±5.12 V / 0-5.12 V (per-conversion selectable) |
| Differential Inputs | Wide common-mode range |
| Supply Voltage (Low Voltage) | 5 V |
| Supply Voltage (High Voltage) | Flexible (per datasheet) |
| Interface | SPI-compatible serial |
| Input Type | Differential |
| Reference | Internal 2.048 V with integrated buffer |
| Package | 48-LQFP (7x7 mm) |
| Operating Temperature Range | -40 °C to +85 °C |
| Channel Selection | Hardware / sequencer, per conversion |
| Mounting Type | Surface Mount |
LTC2335ILX-16 Pin Configuration
| Pin 1 | AIN0+ — Differential analog input 0, positive |
| Pin 2 | AIN0- — Differential analog input 0, negative |
| Pin 3 | AIN1+ — Differential analog input 1, positive |
| Pin 4 | AIN1- — Differential analog input 1, negative |
| Pin 5 | AIN2+ — Differential analog input 2, positive |
| Pin 6 | AIN2- — Differential analog input 2, negative |
| Pin 7 | AIN3+ — Differential analog input 3, positive |
| Pin 8 | AIN3- — Differential analog input 3, negative |
| Pin 9 | AIN4+ — Differential analog input 4, positive |
| Pin 10 | AIN4- — Differential analog input 4, negative |
| Pin 11 | AIN5+ — Differential analog input 5, positive |
| Pin 12 | AIN5- — Differential analog input 5, negative |
| Pin 13 | AIN6+ — Differential analog input 6, positive |
| Pin 14 | AIN6- — Differential analog input 6, negative |
| Pin 15 | AIN7+ — Differential analog input 7, positive |
| Pin 16 | AIN7- — Differential analog input 7, negative |
| Pin 17 | REF — Reference input/output (internal 2.048 V reference) |
| Pin 18 | REFBUF — Reference buffer output |
| Pin 19 | GND — Ground (analog ground) |
| Pin 20 | OVDD — Digital I/O supply |
| Pin 21 | VDD — 5 V low-voltage analog supply |
| Pin 22 | HV — High-voltage supply for input front end |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
| Pin 25 | SCK — SPI serial clock input |
| Pin 26 | SDI — SPI serial data input |
| Pin 27 | SDO — SPI serial data output |
| Pin 28 | CS — SPI chip select (active low) |
| Pin 29 | CNV — Conversion start input |
| Pin 30 | BUSY — Conversion busy output (active high) |
| Pin 31 | CFG0 — Configuration input 0 (channel / span select) |
| Pin 32 | CFG1 — Configuration input 1 (channel / span select) |
| Pin 33 | CFG2 — Configuration input 2 (channel / span select) |
| Pin 34 | CFG3 — Configuration input 3 (channel / span select) |
| Pin 35 | RESET — Reset input (active low) |
| Pin 36 | RBST — Internal reference buffer boost |
| Pin 37 | GND — Ground (analog ground) |
| Pin 38 | GND — Ground (digital ground) |
| Pin 39 | GND — Ground (digital ground) |
| 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 | EPAD — Exposed pad, connect to analog ground |
Typical Applications
LTC2335ILX-16 is suitable for 6 applications: Multi-Channel Industrial Data Acquisition, PLC Analog Input Module, Automated Test Equipment (ATE) Instrumentation, Power-Line & Motor-Control Voltage Monitoring, Medical Patient Monitoring & Diagnostic Front Ends, Precision Sensor Signal Conditioning & Measurement.
Multi-Channel Industrial Data Acquisition
The LTC2335ILX-16's 8 differential inputs and per-conversion SoftSpan switching between ±10.24 V, 0-10.24 V, ±5.12 V, and 0-5.12 V make it a strong fit for multi-channel industrial DAQ systems. At 1 Msps aggregate, a single part scans an entire 8-sensor rack of ±10 V transducers or 4-20 mA-derived signals without external signal conditioning. The integrated 2.048 V reference and reference buffer drop the BOM and PCB area versus discrete reference circuits, while the SPI interface glues directly to common Cortex-M and FPGA host controllers used in PLC backplanes.
Recommended
PLC Analog Input Module
The LTC2335ILX-16 is well matched to PLC analog input modules that aggregate 8 channels of ±10 V field wiring into a backplane. Its bipolar ±10.24 V spans accommodate current shunt, strain gauge and process-voltage signals without external amplifiers. 1 Msps aggregate throughput supports fast loop update rates when paired with a sequencer, while the 48-LQFP footprint simplifies thermal management in the module's compact enclosure. Industrial -40 °C to +85 °C operation covers most cabinet environments per the LTC2335 datasheet.
Recommended
Automated Test Equipment (ATE) Instrumentation
ATE pin-cards benefit from the LTC2335ILX-16's 1 Msps burst rate and per-conversion SoftSpan range switching, which lets one ADC handle stimulus-response measurements across 8 DUT pins at different voltage spans. 16-bit no-missing-codes performance supports calibrated DC source accuracy, while the integrated reference buffer reduces settling-time errors that would otherwise degrade multi-channel scan speed. SPI readout simplifies FPGA-based timing engines commonly used in ATE architectures.
Recommended
Power-Line & Motor-Control Voltage Monitoring
The LTC2335ILX-16's true bipolar ±10.24 V inputs can digitize 3-phase line voltages, motor winding currents (via shunts), and DC-link rails without external resistor dividers or in-amps. Its 1 Msps rate samples fast PWM edges and switching transients in motor-control loops, while per-channel SoftSpan reconfiguration supports both ±10 V mains measurements and 0-5 V low-side current measurements on the same ADC. The differential inputs reject ground bounce in noisy inverter layouts.
Recommended
Medical Patient Monitoring & Diagnostic Front Ends
Multi-channel patient monitors and bench-top diagnostic equipment use the LTC2335ILX-16 to digitize 8 differential sensor signals such as ECG, EEG, SpO2, temperature, and respiration-derived voltages at 1 Msps aggregate. The integrated reference and reference buffer lower analog front-end complexity - critical for medical safety and EMC compliance. Per-channel SoftSpan lets one ASIC capture both high-voltage ECG waveforms and low-voltage temperature sensor outputs on the same converter.
Recommended
Precision Sensor Signal Conditioning & Measurement
Precision multi-sensor measurement systems use the LTC2335ILX-16 to capture 8 channels of mixed transducer outputs (load cells, pressure, flow, temperature) with ±10.24 V true bipolar handling. The internal 2.048 V reference minimizes gain error drift over the industrial -40 °C to +85 °C range, while per-conversion SoftSpan re-ranging allows fast multiplexed scanning of heterogeneous sensors. Differential inputs reject common-mode noise in industrial sensor harnesses.
Recommended
Recommended Products Summary
Engineering reference data for LTC2335ILX-16 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2335HLX-16 | LTC2335ILX-18 | AD7616BSTZ-RL | ADS8556IPMR |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | 48-LQFP (7x7) | 48-LQFP (7x7) | 48-LQFP (7x7) | 48-LQFP family | 48-LQFP |
| Resolution | 16 bits | 16 bits | 18 bits | 16 bits | 16 bits |
| Input Channels | 8 differential | 8 differential | 8 differential | 16 (differential/pseudo-differential) | 6 (simultaneous-sampling) |
| Input Span | ±10.24 V / 0-10.24 V / ±5.12 V / 0-5.12 V (SoftSpan) | SoftSpan: same four ranges | SoftSpan: same four ranges | ±10 V / ±5 V true bipolar | ±10 V / ±5 V true bipolar |
| Architecture | SAR with internal ref + buffer | SAR with internal ref + buffer | SAR with internal ref + buffer | SAR with internal ref | SAR |
Key Differentiators
- Integrated precision reference + reference buffer (vs ADS8556IPMR)
- 8 multiplexed differential channels with per-conversion SoftSpan (vs AD7616BSTZ-RL)
- 1 Msps true bipolar throughput in a 48-LQFP (vs LTC2309IF)
- Industrial -40 °C to +85 °C operation from the same family (vs LTC2335HLX-16)
Design Notes
The LTC2335ILX-16 requires a clean 5 V low-voltage supply on VDD/OVDD and a separate flexible high-voltage supply on HV for the input front end. Use a low-noise LDO (such as the Analog Devices LT3042 or LT3045) to feed VDD because noise on this rail couples directly into the input-referred noise floor. Decouple the HV rail close to the HV pin with a 1 µF X7R ceramic plus a 10 µF bulk cap. Per the LTC2335 datasheet, the HV supply headroom must exceed the largest programmed SoftSpan range (e.g. ±10.24 V requires ≥ ±10.5 V on HV) to prevent input-stage saturation.
Route the 8 differential analog inputs as tightly-coupled pairs over a continuous ground plane on the top layer, with no cuts or traces crossing the pairs. Place the 1 µF + 0.1 µF X7R input RC networks within 5 mm of each AIN± pin to keep charge kickback from the SAR front end out of the analog signal path. The exposed pad (pin 48) must be soldered to a continuous analog-ground copper pour with thermal vias to the inner ground plane; this is the primary heat-dissipation path.
Avoid leaving unused AIN± inputs floating - the datasheet recommends tying them to mid-supply or to ground via a defined DC voltage, otherwise leakage and crosstalk can corrupt the lowest channels. Do not exceed the datasheet absolute-maximum ratings on the analog inputs (±25 V with HV ≥ ±15 V); over-voltage damages the input switches. CFG0-CFG3 should be driven cleanly during the CNV rising edge; glitches between conversions are not latched but can corrupt channel mapping.
Keep the SPI bus (SCK, SDI, SDO, CS, BUSY, CNV) short and length-matched, especially at clock rates above 50 MHz. Place a small series resistor (33 Ω) near the driver on SCK, SDO and CNV to dampen ringing on long backplanes. Add a guard trace between the analog input traces and the digital SPI bus to avoid digital-to-analog coupling, and reference the XAIPART evaluation board DC1685A layout example in the LTC2335 datasheet for a proven multi-layer stack-up.
Compliance Information
Lead-free #PBF finish per DigiKey listing 5965234. RoHS and REACH compliance per Analog Devices product page. Not AEC-Q100 qualified - choose the LTC2335HLX-16 if automotive temperature grade is required. Halogen-free status not stated explicitly in verified data.
