Analog Devices Inc. LTC2315CTS8-12#TRPBF

Overview

LTC2315CTS8-12#TRPBF 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, draws only 6.4 mA at 5 V/5 Msps, and integrates a low-drift (20 ppm/°C max) internal reference with 2.048 V or 4.096 V span-enabling compact, high-speed data acquisition in battery-powered medical imaging and handheld terminals.

For engineers reviewing the LTC2315CTS8-12#TRPBF datasheet, LTC2315CTS8-12#TRPBF pinout, LTC2315CTS8-12#TRPBF application, or LTC2315CTS8-12#TRPBF equivalent, key selection criteria include guaranteed 12-bit no-missing-codes performance, 72.6 dB SINAD at 500 kHz input, SPI-compatible serial interface supporting 1.8 V–5 V logic, nap/sleep modes (<1 µA sleep current), and –40°C to 125°C operation across temperature grades.

Technical Context

The LTC2315CTS8-12#TRPBF implements a single-ended SAR architecture with integrated bandgap reference and reference buffer, automatically selecting 2.048 V output for VDD = 2.7–3.6 V or 4.096 V for VDD = 4.75–5.25 V. Its timing logic supports three SCK configurations-SCK-high-during-acquisition (enabling full 5 Msps), SCK-low-during-acquisition, and continuous clock-with 1-cycle latency and precise tACQ = 40 ns / tCONV = 160 ns timing.

It features dual-supply independence: VDD powers analog circuitry (2.7–5.25 V), while OVDD supplies digital I/O (1.71–5.25 V), enabling interoperability with 1.8 V, 2.5 V, 3.3 V, or 5 V host systems. Power management includes nap mode (1.8 mA, fast wake-up <1 conversion) and sleep mode (0.8 µA typical, 1.1 ms VREF recovery).

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (0.65 mm pitch), 2.9 mm × 1.6 mm footprint, exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IDRCT and MAX11198ETE+, the LTC2315CTS8-12#TRPBF uniquely combines 5 Msps speed, integrated dual-span reference, wide VDD/OVDD supply ranges, and low-power nap/sleep modes-making it optimal for portable, multi-rail, high-dynamic-range systems requiring minimal BOM count and layout area.

Availability

LTC2315CTS8-12#TRPBF is available at Aetrix Electronics and suitable for medical imaging front-ends, handheld test equipment, and automotive ADAS sensor hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant lead-free packaging.

Supply support for LTC2315CTS8-12#TRPBF 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#TRPBF belongs to ADI's precision SAR ADC product line, designed specifically for compact, low-power, high-speed data acquisition where integration, accuracy, and supply flexibility are critical.

FAQ

What is the maximum sampling rate of the LTC2315CTS8-12#TRPBF, and under what conditions is it achieved?

The LTC2315CTS8-12#TRPBF achieves a maximum sampling rate of 5 Msps only when using the SCK-high-during-acquisition timing configuration (Figure 6 in the datasheet), with tACQ = 40 ns and tCONV = 160 ns. This requires strict adherence to t2 and t10 timing constraints and an SCK frequency of 87.5 MHz. Other timing modes yield ≤4.86 Msps.

Does the LTC2315CTS8-12#TRPBF require an external reference, and how does its internal reference behave across supply voltages?

No, the LTC2315CTS8-12#TRPBF does not require an external reference. Its internal reference outputs 2.048 V when VDD is 2.7–3.6 V, and 4.096 V when VDD is 4.75–5.25 V. The reference has a maximum temperature coefficient of 20 ppm/°C and must be bypassed with a 2.2 µF low-ESR ceramic capacitor on the REF pin.

How does the nap mode of the LTC2315CTS8-12#TRPBF differ from sleep mode in terms of wake-up time and power consumption?

Nap mode draws 1.8 mA and allows wake-up and valid conversion within one SCK cycle (<100 ns), preserving reference stability. Sleep mode draws only 0.8 µA typical but requires 1.1 ms for VREF recovery after wake-up due to recharging the 2.2 µF bypass capacitor-making nap ideal for burst sampling and sleep for extended idle periods.

Can the LTC2315CTS8-12#TRPBF interface directly with a 1.8 V microcontroller, and what pins control logic compatibility?

Yes-the LTC2315CTS8-12#TRPBF interfaces directly with 1.8 V microcontrollers via its dedicated OVDD pin (Pin 5), which sets all digital I/O voltage thresholds (VIH/VIL) and SDO output swing. VDD (analog supply) may remain at 5 V independently, enabling mixed-supply system design without level shifters.

What are the absolute maximum ratings for analog input voltage on the LTC2315CTS8-12#TRPBF, and how is overvoltage protected?

The absolute maximum analog input voltage (AIN) on the LTC2315CTS8-12#TRPBF is (–0.3 V) to (VDD + 0.3 V). Internal clamping diodes protect against overvoltage; the device tolerates input currents up to 100 mA below ground or above VDD without latch-up, provided current limiting is implemented externally per application requirements.