LTC2313CTS8-14 - 14-Bit 2.5Msps Serial ADC | Analog Devices
MPN: LTC2313CTS8-14 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
LTC2313CTS8-14 Overview
A successive-approximation-register (SAR) ADC is a precision data-converter architecture that performs one bit at a time using a binary search against the input signal. SAR ADCs sit in the broader signal-chain taxonomy of data converters (SAR -> ADC -> data converter -> mixed-signal IC), and they are favored for their deterministic latency, lack of pipeline delay, and excellent DC accuracy at moderate sampling rates.
Key features include 2.5Msps guaranteed sampling rate, 14-bit resolution with no missing codes, an integrated reference with 20ppm/°C maximum drift, an integrated reference buffer, and a high-speed SPI-compatible serial interface. The single 3V/5V supply operation simplifies power-tree design, while the low 5mA supply current keeps thermal dissipation low in dense analog layouts.
The architecture uses a charge-redistribution SAR core with an internal conversion clock, eliminating the need for an external high-frequency master clock. The integrated 2.5V reference and buffer maintain specified accuracy over the full -40°C to +85°C commercial temperature range. The serial data output (SCK, SDOUT, CNV) supports standard SPI/QSPITM-compatible controllers, simplifying FPGA/CPLD or microcontroller interface logic.
Typical applications include portable instrumentation, battery-powered data acquisition systems, multiplexed data acquisition front ends, isolated industrial sensors, and optical networking modules. The TSOT-23-8 footprint and minimal external BOM make this part especially attractive where PCB area is at a premium.
When designing with this device, place the 10µF decoupling capacitor as close as possible to the REFIN/REFH pin and the supply pin to minimize conversion noise. Although the part is rated for a single 3V/5V supply, the user must ensure that the digital I/O logic levels match the host MCU/FPGA to avoid signal-integrity issues at 2.5Msps.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for LTC2313CTS8-14 — 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 LTC2313CTS8-14 (same form factor and footprint) — differing in Resolution, RoHS Status, Operating Temperature Range, Package, Supply Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2313ITS8-14
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2313HTS8-14#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2313CTS8-14#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2315ITS8-12
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2312HTS8-14
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →ADS8318IDRCR
✅ Drop-In✓ In Stock
$6.85 / Unit
View Datasheet →LTC2313CTS8-14 Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Sampling Rate | 2.5 Msps |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 Input |
| Supply Voltage | 3 V or 5 V (single supply) |
| Supply Current | 5 mA typical |
| Integrated Reference | Yes (low drift, 20 ppm/°C max) |
| Integrated Reference Buffer | Yes |
| Data Interface | Serial (SPI-compatible) |
| Operating Temperature | -40 °C to +85 °C (Commercial) |
| Package Type | TSOT-23-8 (Thin SOT-23, 8-pin) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (per #PBF suffix) |
LTC2313CTS8-14 Pin Configuration
| Pin 1 | IN+ — Analog input (positive differential input) |
| Pin 2 | GND — Ground reference |
| Pin 3 | REF — Reference decoupling |
| Pin 4 | REFH — Reference high / reference buffer output |
| Pin 5 | AVDD — Analog supply input (3V or 5V) |
| Pin 6 | SDOUT — Serial data output (SPI MOSI) |
| Pin 7 | SCK — Serial clock input |
| Pin 8 | CNV — Conversion start / chip enable |
Typical Applications
LTC2313CTS8-14 is suitable for 6 applications: Portable Battery-Powered Data Acquisition, Multiplexed Industrial Sensor Front-End, Optical Networking Monitoring Module, Medical Patient Monitoring Wearable, Automotive Sensor Interface Module, Test and Measurement Instrumentation.
Portable Battery-Powered Data Acquisition
The LTC2313CTS8-14's 5mA supply current at 2.5Msps and single 3V/5V supply make it ideal for portable battery-powered data acquisition. Its integrated 2.5V reference (20ppm/°C max) eliminates external reference components, reducing BOM count and PCB area by 30-40% versus discrete-ADC designs. Placed near the analog sensor with the SPI bus routed to the host MCU, it supports up to 2.5Msps continuous conversion on a single Li-ion cell. Engineers should consider using the part's integrated reference for ±10V sensor interfaces with a front-end attenuator; the supply current scales linearly with sampling rate, allowing duty-cycled operation to extend battery life in intermittent-sampling applications.
Recommended
Multiplexed Industrial Sensor Front-End
The LTC2313CTS8-14's 14-bit no-missing-codes performance and SPI-compatible serial interface simplify multiplexed industrial sensor front-end designs. With 2.5Msps throughput, it can rapidly cycle through thermocouple, strain-gauge, and pressure-sensor channels using an external analog MUX. Its -40°C to +85°C commercial temperature grade and integrated reference buffer maintain accuracy over factory-floor temperature swings. Place the LTC2313CTS8-14 close to the MUX output to minimize charge-injection settling time, and use a small RC filter at the analog input to absorb MUX transients. The 8-pin TSOT-23-8 footprint occupies less than 9mm², ideal for compact 4-channel PLC modules.
Recommended
Optical Networking Monitoring Module
The LTC2313CTS8-14's compact TSOT-23-8 package and low 5mA supply current suit SFP/SFP+ optical networking monitoring modules where board area is severely constrained. Its integrated reference provides a stable 2.5V full-scale for monitoring the laser driver's average power and bias current via transimpedance amplifier outputs. At 2.5Msps, the converter easily oversamples the kHz-range DFB laser control loops without adding latency. Designers should pay attention to ground isolation between the analog AGND and the host MCU's digital ground; a 0Ω ferrite-bead bridge plus a star-ground topology minimize digital switching noise coupling into the converter input.
Recommended
Medical Patient Monitoring Wearable
The LTC2313CTS8-14's low 5mA consumption, integrated reference, and small TSOT-23-8 footprint suit wearable patient-monitoring patches measuring ECG, SpO2, or body temperature. Its 14-bit resolution captures the 0.5mV-5mV ECG signal range with adequate headroom for clinical-grade accuracy when paired with a low-noise analog front end. Operating from a single 3V coin-cell, the ADC supports hours of continuous recording at sub-1Msps duty-cycled rates. To preserve battery life, set the CNV pin low between conversions; the part consumes microamps of standby current between conversions, ideal for sampling intervals of 100ms or longer.
Recommended
Automotive Sensor Interface Module
While the LTC2313CTS8-14 itself is commercial-grade, its SPI-compatible serial interface and integrated reference make it a strong candidate for non-safety automotive sensor interface modules such as HVAC controls and battery management telemetry. Its 14-bit no-missing-codes performance over -40°C to +85°C handles the underhood temperature range for cabin-mounted modules. With 2.5Msps throughput, the ADC easily captures multiple sensor channels via an external MUX within the 100ms automotive refresh cycle. Designers targeting AEC-Q100 applications should evaluate the LTC2313ITS8-14 (industrial temperature) variant instead.
Recommended
Test and Measurement Instrumentation
The LTC2313CTS8-14's 14-bit accuracy, 2.5Msps throughput, and integrated reference fit bench-top DMMs, oscilloscope auxiliary channels, and laboratory data loggers. Its SPI-compatible output streams directly into an FPGA or microcontroller for real-time DSP processing. At 2.5Msps, the ADC comfortably oversamples audio-bandwidth signals for noise-shaped digital filtering. Reference the analog input with a small anti-alias RC filter (typically 1kΩ/100pF) to suppress out-of-band noise; the -3dB bandwidth should be set near 4-5MHz to preserve the 2.5Msps Nyquist band while rejecting MHz-range interferers common on the bench.
Recommended
Recommended Products Summary
Engineering reference data for LTC2313CTS8-14 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2313ITS8-14 | LTC2313HTS8-14#TRMPBF | LTC2313CTS8-14#TRPBF | LTC2315ITS8-12 | LTC2312HTS8-14 | ADS8318IDRCR |
|---|---|---|---|---|---|---|---|
| Package | TSOT-23-8 | TSOT-23-8 (same) | TSOT-23-8 (same) | TSOT-23-8 (same) | TSOT-23-8 (same) | TSOT-23-8 (same) | TSOT-23-8 (same) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 12 bit | 14 bit | 12 bit |
| Sampling Rate | 2.5 Msps | 2.5 Msps | 2.5 Msps | 2.5 Msps | 2.5 Msps | 500 ksps | 500 ksps |
| Integrated Reference | Yes (20 ppm/°C max) | Yes | Yes | Yes | Yes | Yes | No (external required) |
| Data Interface | Serial SPI-compatible | Serial SPI | Serial SPI | Serial SPI | Serial SPI | Serial SPI | Serial SPI |
| Operating Temperature | -40 °C to +85 °C (Commercial) | -40 °C to +85 °C (Industrial) | -40 °C to +125 °C (Extended) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C | -40 °C to +85 °C |
Key Differentiators
- Integrated reference and reference buffer in TSOT-23-8 (vs ADS8318IDRCR)
- Higher sampling rate than LTC2312 family (vs LTC2312HTS8-14)
- Higher resolution than LTC2315-12 family (vs LTC2315ITS8-12)
Design Notes
Place the 10µF decoupling capacitor (X7R or X5R ceramic) within 2mm of the AVDD pin and a 0.1µF capacitor directly adjacent for high-frequency noise bypass. Connect all ground pins to a single-point ground star, separating AGND and DGND at the package and joining them only at the system ground plane. The TSOT-23-8 lead frame cannot dissipate much power, so avoid running high-current return paths beneath the part.
Route the SCK and SDOUT traces as a matched-impedance differential pair (typically 50Ω to ground) with a maximum length of 50mm to prevent ringing at 2.5Msps. Keep the digital traces on the opposite side of the ground plane from the analog IN+ trace. Place a small ferrite bead (600Ω at 100MHz) in series with the SCK trace near the host controller if noise coupling is observed.
Do not leave the CNV pin floating - it must be tied high through a 10kΩ pull-up or driven actively by the host MCU to avoid spurious conversions during power-up. Ensure the REF pin bypass capacitor is rated for 5V operation minimum to avoid breakdown, and use a low-ESR ceramic (X7R) type. Avoid loading the REFH pin with more than 2mA to maintain reference accuracy over temperature.
Estimated: at VDD=5V and full 2.5Msps conversion rate, the part consumes 5mA × 5V = 25mW. With idle/standby current of ~1µA, duty-cycled operation (10% duty) drops average consumption to ~3mW, enabling coin-cell powered designs to operate for months. Use the CNV pin to gate conversions and place the MCU in sleep between samples for maximum battery life.
Compliance Information
RoHS compliance verified per #PBF ordering suffix. Not AEC-Q100 qualified; evaluate LTC2313ITS8-14 for industrial-grade designs.
