Analog Devices Inc. LTC1197LCS8#TRPBF

Overview

LTC1197LCS8#TRPBF from Analog Devices (formerly Linear Technology) is a 10-bit, 250ksps successive approximation ADC with differential analog input, internal sample-and-hold, and 3-wire SPI/MICROWIRE-compatible serial interface. It operates from a single 2.7V supply, draws only 0.8mA typical at full speed, and features auto shutdown that scales supply current linearly with sampling rate. It is used in portable instrumentation where low power, high resolution, and compact MSOP-8 packaging are critical.

For engineers reviewing the LTC1197LCS8#TRPBF datasheet, LTC1197LCS8#TRPBF pinout, LTC1197LCS8#TRPBF application, or LTC1197LCS8#TRPBF equivalent, key selection criteria include its 2.7V operation, differential input range (0V to VCC), 2.2mW typical power dissipation, 10-bit no-missing-codes performance, and compatibility with microcontrollers via CS/CLK/DOUT serial interface.

Technical Context

The LTC1197LCS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and programmable reference input (VREF). Its differential input stage supports ratiometric measurement and direct connection to low-output-impedance sensors without gain stages.

It uses a synchronous 3-wire serial interface (CS, CLK, DOUT) with MSB-first output, requiring 14 clock cycles per conversion. The device enters automatic power-down between conversions, reducing ICC to sub-µA levels when idle - a core feature enabling micropower system design.

Key Specifications

Pinout & Package

Package: 8-pin MSOP (3mm × 3mm), RoHS-compliant, moisture-sensitive level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with ADS7822U and MAX11100ETE+, the LTC1197LCS8#TRPBF uniquely combines 250ksps sampling, true auto shutdown, external VREF flexibility, and MSOP-8 size - making it optimal for space-constrained, battery-operated systems requiring configurable full-scale ranges.

Availability

LTC1197LCS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-operated sensors, and handheld test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC1197LCS8#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 LTC1197L series belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for ultra-low-power, high-resolution ADC applications in portable and energy-constrained systems.

FAQ

What is the maximum clock frequency supported by the LTC1197LCS8#TRPBF?

The LTC1197LCS8#TRPBF supports a maximum clock frequency of 3.5MHz when operating from a 2.7V supply. This clock rate enables its full 250ksps sampling capability. Exceeding this frequency may cause timing violations or degraded AC performance, particularly at temperature extremes. The device's tCYC (total cycle time) is specified as 14–16 clock cycles, and timing parameters like tdDO and tCONV are guaranteed only within the recommended clock range.

Does the LTC1197LCS8#TRPBF require an external reference voltage?

Yes, the LTC1197LCS8#TRPBF requires an external reference voltage applied to the VREF pin. It accepts references from 0.2V to VCC + 0.05V, enabling flexible full-scale configuration - including ratiometric measurement using a sensor-supply-derived reference. Unlike some ADCs with internal references, the LTC1197LCS8#TRPBF offers no internal reference option; omitting VREF or leaving it unconnected will prevent valid conversion.

Can the LTC1197LCS8#TRPBF interface directly with an Arduino or STM32 microcontroller?

Yes, the LTC1197LCS8#TRPBF can interface directly with Arduino and STM32 microcontrollers via its 3-wire SPI-compatible serial interface (CS, CLK, DOUT). No level-shifting or protocol translation is needed - standard SPI library functions can be used, provided the microcontroller drives CS active-low and clocks data on the rising edge. The LTC1197LCS8#TRPBF outputs 10-bit results MSB-first after two null bits, matching common SPI framing expectations.

What is the operating temperature range of the LTC1197LCS8#TRPBF?

The LTC1197LCS8#TRPBF is specified for operation from –40°C to +85°C. This industrial-grade temperature range is confirmed in the "Order Information" section of the datasheet under the "LTC1197LI" and "LTC1197LIS8" part numbering variants. All DC and AC specifications - including offset error (±2 LSB), gain error (±4 LSB), and dynamic performance (S/(N+D) = 58dB) - are guaranteed across this full range.

How does the auto shutdown feature reduce power consumption in the LTC1197LCS8#TRPBF?

The auto shutdown feature in the LTC1197LCS8#TRPBF reduces supply current linearly as sampling frequency decreases - from 0.8mA at 250ksps down to <1µA when idle (CS high). This occurs because the internal bias and clock circuitry power down between conversions, eliminating static current overhead. Unlike software-controlled shutdown modes, this behavior is fully automatic and requires no host intervention - making it ideal for burst-mode or event-triggered acquisition in battery-powered systems.