Analog Devices Inc. DC1563A-F

Overview

LTC2314-14 from Analog Devices (formerly Linear Technology) is a 14-bit, 4.5 Msps successive approximation register (SAR) analog-to-digital converter in an 8-lead TSOT-23 package. It operates from a single 2.7V–5.25V analog supply, integrates a low-drift (20 ppm/°C max) internal reference (2.048 V or 4.096 V), and delivers 77.5 dB SNR and –85 dB THD at 500 kHz input frequency - enabling high-fidelity signal capture in compact, battery-powered instrumentation.

For engineers reviewing the LTC2314-14 datasheet, LTC2314-14 pinout, LTC2314-14 application, or LTC2314-14 equivalent, key selection criteria include guaranteed 14-bit no-missing-codes performance, SPI-compatible 3-wire serial interface with 1-cycle latency, dual digital/analog supply independence (VDD/OVDD), nap/sleep power modes (<1 µA sleep current), and operation across –40°C to 125°C.

Technical Context

The LTC2314-14 implements a SAR architecture with integrated bandgap reference and reference buffer, automatically selecting 2.048 V span for VDD = 2.7–3.6 V and 4.096 V span for VDD = 4.75–5.25 V. Its sample-and-hold supports 40 ns acquisition time and 182 ns conversion time, achieving minimum 222 ns throughput per sample.

It features separate analog (VDD) and digital I/O (OVDD) supplies - OVDD ranges 1.71–5.25 V - enabling direct interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V logic without level shifters. Serial communication uses CS-active-low framing, SCK falling-edge clocking, and MSB-first SDO output with configurable leading-zero format depending on SCK timing mode.

Key Specifications

Pinout & Package

Package: 8-lead plastic TSOT-23 (TS8), 3 mm × 1.75 mm × 0.8 mm, moisture sensitivity level 1 (MSL1), RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SAR ADC applications.

Compared with ADS8860 and AD7980, the LTC2314-14 uniquely balances 4.5 Msps throughput, integrated dual-span reference, ultra-low sleep current, and 1.71–5.25 V OVDD compatibility - making it optimal for compact, battery-aware, wideband signal acquisition where board space and power are constrained.

Availability

LTC2314-14 is available at Aetrix Electronics and suitable for high-speed data acquisition, portable medical instrumentation, and automotive sensor interfaces requiring stable component supply and long-term manufacturability.

Supply support for LTC2314-14 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2314-14 belongs to ADI's precision high-speed SAR ADC product line, designed specifically for space- and power-constrained systems demanding both wide dynamic range and rapid sampling without external reference or level-shifting components.

FAQ

What is the maximum sampling rate supported by the LTC2314-14, and under what conditions?

The LTC2314-14 achieves a maximum sampling rate of 4.5 Msps when using the SCK-high-during-acquisition timing mode with an 87.5 MHz serial clock. This requires observing t_ACQ = 40 ns and t_CONV = 182 ns, yielding a minimum throughput time of 222 ns. The 4.5 Msps rate is only guaranteed under these specific timing conditions and with VDD = 5 V and OVDD ≥ 2.5 V. Using continuous or SCK-low timing reduces maximum throughput to 4.375 Msps.

Does the LTC2314-14 require an external reference, or does it have an integrated one?

The LTC2314-14 includes a fully integrated reference and reference buffer - no external reference is required. It auto-selects a 2.048 V output when VDD is 2.7–3.6 V and 4.096 V when VDD is 4.75–5.25 V. The REF pin serves as both output and overdrive input (with ≥50 mV headroom), and must be bypassed with a 2.2 µF ceramic capacitor for stability. This integration reduces BOM count and PCB area versus solutions requiring discrete references.

How does the nap mode of the LTC2314-14 differ from sleep mode in terms of wake-up time and power consumption?

Nap mode draws 1.8 mA and wakes up in ≤50 ns (one SCK cycle), preserving reference stability for immediate accurate conversion. Sleep mode draws only 0.8 µA but requires 1.1 ms for V_REF recovery after wake-up due to recharge of the 2.2 µF bypass capacitor. Nap mode is ideal for burst sampling; sleep mode suits extended idle periods. Both are entered via specific CS pulse sequences - two pulses for nap, four for sleep - with SCK held static.

Can the LTC2314-14 interface directly with a 1.8 V microcontroller without level shifters?

Yes - the LTC2314-14 supports OVDD from 1.71 V to 5.25 V, allowing its CS, SCK, and SDO pins to operate natively at 1.8 V logic levels. When OVDD = 1.8 V, VIH = 1.44 V and VIL = 0.36 V, fully compatible with standard 1.8 V CMOS I/O. No external level shifters or translators are needed, simplifying interface design and reducing component count in mixed-voltage systems.

What is the guaranteed operating temperature range for the industrial-grade LTC2314ITS8-14 variant?

The LTC2314ITS8-14 variant is specified for operation from –40°C to +85°C ambient temperature, with full electrical performance guaranteed across this range. It uses the same 8-lead TSOT-23 package as other variants and shares identical pinout, timing, and functional specifications - differing only in temperature screening and marking (LTFZF). This makes it suitable for industrial automation, outdoor infrastructure, and commercial-grade embedded systems.