Analog Devices Inc. LTC2315CTS8-12#TRMPBF

Overview

LTC2315CTS8-12#TRMPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 5 Msps successive approximation register (SAR) analog-to-digital converter in an 8-lead TSOT-23 package. It operates from a 2.7 V to 5.25 V analog supply, integrates a low-drift (20 ppm/°C max) internal reference (2.048 V or 4.096 V), and delivers 72.6 dB SINAD and –84 dB THD at 500 kHz input frequency. It is used in high-speed data acquisition systems requiring compact size, low power, and wide temperature operation (0°C to 70°C).

For engineers reviewing the LTC2315CTS8-12#TRMPBF datasheet, LTC2315CTS8-12#TRMPBF pinout, LTC2315CTS8-12#TRMPBF application, or LTC2315CTS8-12#TRMPBF equivalent, key selection criteria include guaranteed 12-bit no-missing-codes performance, SPI-compatible serial interface with 1.8 V–5 V OVDD compatibility, nap/sleep mode power management (<1 µA sleep current), and TSOT-23 footprint suitability for space-constrained PCB layouts.

Technical Context

The LTC2315CTS8-12#TRMPBF implements a SAR architecture with integrated bandgap reference and reference buffer, enabling self-contained operation without external voltage references. Its timing logic supports three SCK timing modes-SCK-high-during-acquisition (enabling full 5 Msps throughput), SCK-low-during-acquisition, and continuous SCK-with minimum throughput time of 200 ns and 1-cycle conversion latency.

It features dual-supply independence: VDD powers analog circuitry (2.7 V–5.25 V), while OVDD powers digital I/O (1.71 V–5.25 V), allowing seamless interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V host processors. Nap mode retains reference stability for sub-50 ns wake-up; sleep mode disables bias circuits for ultra-low leakage (<1 µA), requiring 1.1 ms reference recovery before valid conversion.

Key Specifications

Pinout & Package

Package: 8-lead plastic TSOT-23 (0.65 mm pitch), 2.9 mm × 1.6 mm footprint, 0.8 mm height, RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS8860IDRCT and MAX11198ETE+, the LTC2315CTS8-12#TRMPBF uniquely balances 5 Msps throughput, integrated 4.096 V reference, and 1.8 V–5 V OVDD flexibility - making it the only option among the three capable of direct interfacing with both legacy 5 V microcontrollers and modern 1.8 V FPGAs at full speed.

Availability

LTC2315CTS8-12#TRMPBF is available at Aetrix Electronics and suitable for high-speed data acquisition, battery-operated instrumentation, and medical imaging systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC2315CTS8-12#TRMPBF 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 LTC2315CTS8-12#TRMPBF belongs to ADI's precision SAR ADC product line, designed specifically for applications demanding high speed, low power, and minimal external components - such as portable test equipment and real-time signal monitoring systems.

FAQ

What is the maximum sampling rate of the LTC2315CTS8-12#TRMPBF?

The LTC2315CTS8-12#TRMPBF achieves a maximum sampling rate of 5 Msps, but only when using the SCK-high-during-acquisition timing mode with an 87.5 MHz serial clock. Other timing configurations (SCK-low or continuous SCK) limit throughput to 4.86 Msps. The device guarantees 200 ns minimum throughput time and 1-cycle conversion latency under optimal conditions.

Does the LTC2315CTS8-12#TRMPBF require an external reference?

No, the LTC2315CTS8-12#TRMPBF does not require an external reference. It integrates a precision bandgap reference and reference buffer that automatically outputs either 2.048 V (when VDD is 2.7 V–3.6 V) or 4.096 V (when VDD is 4.75 V–5.25 V). A 2.2 µF ceramic capacitor must be placed on the REF pin to ensure stability and low noise performance.

How does the nap mode differ from sleep mode in the LTC2315CTS8-12#TRMPBF?

In nap mode, the LTC2315CTS8-12#TRMPBF retains internal reference and bias circuitry, enabling wake-up and valid conversion within one clock cycle (<50 ns). In sleep mode, all bias circuits-including the bandgap and reference buffer-are powered down, reducing supply current to <1 µA but requiring 1.1 ms for reference recovery before accurate conversion. Nap mode is ideal for burst acquisition; sleep mode suits extended idle periods.

Can the LTC2315CTS8-12#TRMPBF interface with a 1.8 V microcontroller?

Yes, the LTC2315CTS8-12#TRMPBF can interface directly with a 1.8 V microcontroller via its dedicated OVDD pin, which supports 1.71 V–5.25 V logic levels. The SDO output swing, SCK input thresholds, and CS input thresholds are all referenced to OVDD-not VDD-so no level-shifting circuitry is required when connecting to 1.8 V, 2.5 V, 3.3 V, or 5 V hosts.

What is the operating temperature range for the LTC2315CTS8-12#TRMPBF?

The LTC2315CTS8-12#TRMPBF is specified for operation from 0°C to 70°C (Commercial grade), as indicated by the "C" suffix in the part number. This range is validated across all electrical specifications including INL, DNL, SINAD, and reference drift (≤20 ppm/°C). For extended temperature operation, consider the I-grade (–40°C to 85°C) or H-grade (–40°C to 125°C) variants.