Analog Devices Inc. LTC1197IMS8#TRPBF

Overview

LTC1197IMS8#TRPBF from Analog Devices (formerly Linear Technology) is a 10-bit, 250ksps successive approximation ADC with differential analog input, external reference support, and auto shutdown in an 8-pin MSOP package. It operates from a single 2.7V supply, draws only 0.8mA at full speed, and features SPI/MICROWIRE-compatible 3-wire serial I/O. It is used in portable instrumentation for high-resolution sampling of low-noise sensor signals.

For engineers reviewing the LTC1197IMS8#TRPBF datasheet, LTC1197IMS8#TRPBF pinout, LTC1197IMS8#TRPBF application, or LTC1197IMS8#TRPBF equivalent, key selection criteria include its 250ksps sampling rate at 2.7V, ±2 LSB offset error, 58dB SNR at 50kHz, differential input architecture, and guaranteed operation over –40°C to 85°C industrial temperature range.

Technical Context

The LTC1197IMS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold. Its differential input accepts 0V to VCC analog spans and supports ratiometric operation using external references down to 200mV full-scale, enabling 200µV resolution without gain stages.

It uses a 3-wire serial interface (CS, CLK, DOUT) with MSB-first output, no DIN pin, and automatic power-down between conversions. Conversion time is fixed at 2.9µs (10.5 clock cycles), and timing is synchronized to the rising edge of CLK with CS falling-edge initiation.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), moisture-sensitive level 1, RoHS-compliant.

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 LTC1197IMS8#TRPBF offers the lowest power at 250ksps in MSOP-8 with guaranteed differential input performance and external reference control - ideal for space-constrained, battery-operated, or ratiometric sensor systems where 10-bit resolution is sufficient.

Availability

LTC1197IMS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, medical vital sign monitors, and energy metering subsystems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade performance.

Supply support for LTC1197IMS8#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 LTC1197IMS8#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for low-power, high-accuracy sensor digitization in space- and energy-constrained embedded systems.

FAQ

What is the maximum clock frequency supported by the LTC1197IMS8#TRPBF?

The LTC1197IMS8#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 3.5MHz may cause timing violations or degraded AC performance, particularly at temperature extremes. The device's conversion time remains fixed at 2.9µs (10.5 clock cycles), so clock rate directly determines achievable throughput.

Does the LTC1197IMS8#TRPBF support differential input mode?

Yes, the LTC1197IMS8#TRPBF supports true differential input mode via dedicated +IN (Pin 2) and –IN (Pin 3) terminals. It measures the voltage difference between these pins with respect to the selected reference, enabling common-mode noise rejection. Unlike multiplexed variants (e.g., LTC1199), it does not require configuration words - differential operation is inherent to its architecture.

Can the LTC1197IMS8#TRPBF operate from a 5V supply?

No, the LTC1197IMS8#TRPBF is specified only for 2.7V to 4V operation. Its absolute maximum supply voltage is 12V, but functional performance (offset, linearity, sampling rate) is not guaranteed above 4V. For 5V systems, the pin-compatible LTC1197CMS8 or LTC1197IMS8 (non-L version) must be used - those variants are rated for 4V–9V operation and deliver 500ksps at 5V.

What is the purpose of the VREF pin on the LTC1197IMS8#TRPBF?

The VREF pin (Pin 5) on the LTC1197IMS8#TRPBF sets the full-scale input range for analog conversion. It accepts an external reference voltage from 0.2V to VCC + 0.05V, enabling ratiometric measurements (e.g., with bridge sensors) or precise scaling using high-stability references like the LT1019. Unlike internal-reference ADCs, this pin gives designers full control over reference accuracy, temperature drift, and noise performance.

Is the LTC1197IMS8#TRPBF pin-compatible with the LTC1197LIMS8?

Yes, the LTC1197IMS8#TRPBF and LTC1197LIMS8 are identical in pinout, package (MSOP-8), and functional interface. Both share the same 2.7V–4V supply range, –40°C to +85°C temperature grade, and differential input architecture. The "L" suffix denotes the low-voltage variant, and the "I" denotes industrial temperature grade - the #TRPBF packaging (tape-and-reel) is identical across both part numbers.