LTC2314HTS8-14 - 14-bit 4.5Msps Serial SAR ADC | Analog Devices
MPN: LTC2314HTS8-14 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.8 | $7.80 |
| 10 | $6.95 | $69.50 |
| 100 | $5.84 | $584.00 |
| 500 | $5.05 | $2,525.00 |
| 1,000 | $4.4 | $4,400.00 |
LTC2314HTS8-14 Overview
A SAR ADC is a type of data converter that uses a binary-search algorithm against an internal capacitive array, producing a deterministic single-shot conversion with no latency and strong transient behaviour. SAR ADCs are widely preferred for multiplexed-channel, motor-control, and precision-instrumentation applications because they offer true 14-bit no-missing-code performance, simple serial LVDS-like SCK/MISO interfacing, and intrinsic immunity to pipeline latency. The LTC2314HTS8-14 belongs to the broader category of analog-to-digital converters (ADCs), which sit between the analog front end (sensors, amplifiers, filters) and the digital processor, forming the data-acquisition bridge of any mixed-signal system.
Key differentiating specifications include 4.5 Msps throughput, an integrated 2.048 V (or externally overridable) low-drift reference, 14-bit guaranteed no-missing-code linearity, and a wide -40°C to +125°C automotive (H-grade) operating temperature range. The wide analog supply range (2.7V to 5.25V) permits direct connection to 3.3V or 5V system rails without level shifters. The TSOT-23-8 footprint occupies only 2.9 mm × 2.8 mm of PCB area, making the part suitable for high-density data-acquisition boards.
The device employs a charge-redistribution SAR core driven by an internal oscillator, with a 3-wire SPI-compatible serial interface (SCK, SDO, CNV) that can be daisy-chained across multiple devices. Conversion latency is one CNV rising edge, and digital power consumption scales linearly with sample rate, enabling energy-proportional acquisition. The architecture delivers true 14-bit DC performance with low integral nonlinearity and low noise at full speed, supporting both high-speed multiplexed and high-precision single-channel designs.
Typical applications include multiplexed data-acquisition systems, automotive sensor interfaces (strain-switches, thermocouples, RTDs), motor control current and position loops, portable and battery-powered instrumentation, and process-control front ends. The integrated reference reduces external BOM while the small footprint enables compact analog modules.
When designing with the LTC2314HTS8-14, place the 10 µF input bypass capacitor within 5 mm of the VDD pin and route the SCK, SDO, and GND traces as short as possible to minimize digital coupling. Because the part uses an internal oscillator, the SCK frequency tracks the conversion rate; if the host cannot keep up, the part enters a self-clocked mode and the conversion completes automatically.
This page consolidates distributor stock, drop-in equivalents from the LTC231x/LTC23xx family, and design notes drawn from the Analog Devices datasheet, presenting a self-contained selection reference unavailable from any single distributor product page.
Drop-in alternatives for LTC2314HTS8-14 — 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 LTC2314HTS8-14 (same form factor and footprint) — differing in RoHS Status, Supply Current, Package, Sample Rate, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2314ITS8-14
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2314CTS8-14
✅ Drop-In✓ In Stock
$5.05 / Unit
View Datasheet →LTC2313HTS8-14
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →LTC2312HTS8-14
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →LTC2312HTS8-12
✅ Drop-In✓ In Stock
$4.18 / Unit
View Datasheet →LTC2314HTS8-14 Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Sample Rate | 4.5 Msps |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Analog Supply Current (typ) | 6.2 mA at 4.5 Msps |
| Input Voltage Range | 0 V to VREF (true bipolar input via input driver network per datasheet) |
| Reference Type | Internal bandgap with reference buffer, external reference supported |
| Reference Voltage | 2.048 V internal typical |
| Reference Drift (max) | 20 ppm/°C |
| Digital Interface | SPI-compatible serial (3-wire SCK / SDO / CNV) |
| Operating Temperature Range (H grade) | -40 °C to +125 °C |
| Package | TSOT-23-8 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (#TRMPBF suffix per DigiKey listing) |
| MSL Level | 1 (per JEDEC J-STD-020, vendor typical) |
LTC2314HTS8-14 Pin Configuration
| Pin 1 | REF — Reference voltage input/output (internal 2.048 V bandgap) |
| Pin 2 | IN+ — Analog input (positive) |
| Pin 3 | GND — Analog ground |
| Pin 4 | SDO — Serial data output (SPI MISO) |
| Pin 5 | SCK — Serial clock input |
| Pin 6 | CNV — Conversion start (active high) |
| Pin 7 | VDD — Analog supply (2.7 V to 5.25 V) |
| Pin 8 | GND — Analog ground (separate pin) |
Typical Applications
LTC2314HTS8-14 is suitable for 6 applications: Multiplexed Data Acquisition Systems, Automotive Sensor Signal Conditioning, Motor Control Current and Position Loops, Portable and Battery-Powered Instrumentation, Process Control and Industrial PLCs, Test and Measurement Equipment.
Multiplexed Data Acquisition Systems
The LTC2314HTS8-14's 4.5 Msps burst sample rate and 14-bit resolution make it well-suited for multiplexed multi-channel data-acquisition front-ends where one ADC services several analog inputs through an external MUX. The integrated 2.048 V reference with 20 ppm/°C drift eliminates an external ADR31x part, reducing BOM cost and board area. The TSOT-23-8 footprint occupies 2.9 mm × 2.8 mm, allowing the part to be placed close to the analog input pins of the MUX for short, low-noise signal routing. Recommended companion parts: an LTC1392 8-channel analog MUX, an LT6015 op-amp input buffer, and an LT3042 low-noise LDO for the analog rail.
Recommended
Automotive Sensor Signal Conditioning
The LTC2314HTS8-14 H-grade variant operates from -40 °C to +125 °C, satisfying the temperature range for automotive under-hood and chassis electronics. Its 4.5 Msps throughput captures high-speed current-sense and resolver-position signals in electric-power-steering, brake-by-wire, and traction-control ECUs. The integrated reference and small TSOT-23-8 footprint help fit the part into space-constrained ECU modules. AEC-Q100 qualification status should be confirmed with Analog Devices directly via the automotive product portal for production designs.
Recommended
Motor Control Current and Position Loops
The 4.5 Msps conversion rate of the LTC2314HTS8-14 enables single-cycle sampling of PWM-driven phase currents in field-oriented-control (FOC) loops at 20 kHz PWM switching with margin for oversampling. The 14-bit resolution provides sufficient dynamic range for 10-A peak phase currents with 1 mA resolution. The SAR architecture guarantees deterministic single-shot latency, essential for current-loop stability in trapezoidal and sinusoidal commutation. Pair with an LT8301 isolated gate-driver and an ADuM3151 digital isolator to complete a safe, isolated motor-control channel.
Recommended
Portable and Battery-Powered Instrumentation
The LTC2314HTS8-14's 6.2 mA active current scales linearly with sample rate, enabling duty-cycled acquisition in handheld multimeters, oscilloscope front-ends, and field-data loggers. The 2.7 V minimum analog rail supports single-cell Li-ion packs directly. The integrated reference removes one external component, reducing PCB area and quiescent draw. The 14-bit no-missing-code performance is sufficient for handheld DMM basic-mode accuracy (3.5-digit), with the 4.5 Msps burst rate enabling transient capture.
Recommended
Process Control and Industrial PLCs
In 4 mA to 20 mA loop-powered industrial transmitters and PLC analog-input modules, the LTC2314HTS8-14 provides 14-bit accuracy for 0.1% full-scale measurement typical in process control. The -40 °C to +125 °C H-grade operating range handles outdoor and cabinet-mounted installations. The wide 2.7 V to 5.25 V analog supply permits direct interface to 5 V backplanes. The 3-wire SPI-compatible serial interface simplifies isolation with a single ADuM1411 digital isolator.
Recommended
Test and Measurement Equipment
The LTC2314HTS8-14 is appropriate as an auxiliary ADC in bench oscilloscopes, data loggers, and arbitrary-waveform-generator feedback paths where 14-bit resolution and 4.5 Msps are sufficient for non-primary acquisition channels. The integrated reference with 20 ppm/°C drift simplifies calibration procedures. The TSOT-23-8 footprint allows the part to be placed near the analog input connector for optimum signal integrity. Pair with an LT1028 precision op-amp input buffer and an LTC2636 12-bit DAC for the calibration reference.
Recommended
Recommended Products Summary
Engineering reference data for LTC2314HTS8-14 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2314ITS8-14 | LTC2314CTS8-14 | LTC2313HTS8-14 | LTC2312HTS8-14 | LTC2312HTS8-12 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSOT-23-8 | TSOT-23-8 - same | TSOT-23-8 - same | TSOT-23-8 - same | TSOT-23-8 - same | TSOT-23-8 - same |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit (companion) | 12 bit |
| Sample Rate | 4.5 Msps | 4.5 Msps | 4.5 Msps | 2 Msps | 500 ksps | 500 ksps |
| Analog Supply | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Operating Temperature | -40 °C to +125 °C (H) | -40 °C to +85 °C (I) | 0 °C to +70 °C (C) | -40 °C to +125 °C (H) | -40 °C to +125 °C (H) | -40 °C to +125 °C (H) |
| Internal Reference | 2.048 V / 20 ppm/°C | 2.048 V / 20 ppm/°C | 2.048 V / 20 ppm/°C | 2.048 V / 20 ppm/°C | 2.048 V / 20 ppm/°C | 2.048 V / 20 ppm/°C |
| Pinout Compatibility | TSOT-23-8 baseline | Fully pin-compatible | Fully pin-compatible | Fully pin-compatible | Fully pin-compatible | Fully pin-compatible |
Key Differentiators
- Higher sample rate at the same resolution and footprint (vs LTC2313HTS8-14)
- Higher resolution and bandwidth versus the 12-bit family (vs LTC2312HTS8-12)
- Extended automotive temperature range versus commercial grade (vs LTC2314CTS8-14)
- Integrated low-drift reference eliminates external ADR31x part (vs ADS8318 (TI))
Design Notes
Place a 10 µF X7R or X5R ceramic bypass capacitor within 5 mm of the VDD pin and a 0.1 µF ceramic capacitor within 1 mm to suppress switching noise from the internal oscillator. The reference pin requires a 10 µF ceramic bypass; omit this capacitor only if the internal reference is disabled. Estimated: at 4.5 Msps, the 6.2 mA typical supply current combined with a 5 V rail results in 31 mW internal dissipation, which is safely within TSOT-23-8 thermal limits and requires no heatsink.
Keep the IN+ trace short and isolated from the digital SCK/SDO/CNV traces by a ground guard ring to prevent digital switching noise from coupling into the analog input. Route the SCK line with 50 Ω characteristic impedance if the cable or PCB trace exceeds 50 mm. Place a ferrite bead or small resistor in series with VDD if shared with a noisy digital supply. Per Analog Devices evaluation-board layout guidance, the GND pin should be stitched to the analog ground plane with at least three 0.3 mm vias.
The 3-wire SPI-compatible interface uses the CNV rising edge as the conversion-start trigger and clocks out data on SCK falling edges. Hold SCK low during conversion to minimize digital switching noise during the SAR acquisition phase. For daisy-chaining multiple LTC2314HTS8-14 devices, observe the SCK-to-CNV timing requirement (tCNVH) of at least 20 ns to ensure clean acquisition. When isolating the SPI bus with a digital isolator, choose an isolator with low propagation-delay skew (such as ADuM3151) to maintain deterministic sample-to-output latency.
Do not float the CNV pin — it must be tied high-to-low or driven by a logic output, otherwise the device enters an indeterminate state. The REF pin must not be loaded with more than 1 mA DC or 100 nF capacitive load without a buffer. According to the LTC2314-14 datasheet (231414fa), the device is not a true bipolar input ADC; for ±10 V or 4-20 mA inputs, add an external input-protection network as documented in the typical application circuit. Do not exceed the absolute-maximum VDD of 6 V even momentarily.
Compliance Information
RoHS and lead-free compliance per Analog Devices product page and #TRMPBF suffix per DigiKey listing. H-grade temperature rating (-40 °C to +125 °C) is not equivalent to formal AEC-Q100 qualification — confirm Q100 status with the manufacturer for production automotive deployments.
