Analog Devices Inc. LTC1197LIS8#PBF

Overview

LTC1197LIS8#PBF 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 for precision DC-coupled signal digitization with 200mV–2.7V input span.

For engineers reviewing the LTC1197LIS8#PBF datasheet, LTC1197LIS8#PBF pinout, LTC1197LIS8#PBF application, or LTC1197LIS8#PBF equivalent, key selection criteria include its 2.7V operation, differential input architecture, 10-bit no-missing-codes resolution, 250ksps max sampling rate, and MSOP-8 package compatibility with space-constrained low-power systems.

Technical Context

The LTC1197LIS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and programmable reference scaling. Its differential input supports ratiometric measurements and direct connection to low-output-impedance sensors without gain stages.

It uses a 3-wire serial interface (CS, CLK, DOUT) with MSB-first output, requiring no configuration word. Conversion timing is deterministic: 2.9µs conversion time, 1.5-clock sampling window, and 14-clock total cycle time at 3.5MHz clock - all specified over –45°C to 85°C industrial temperature range.

Key Specifications

Pinout & Package

Package: 8-pin MSOP (MS8), 3mm × 3mm, 0.65mm pitch, exposed pad (not electrically connected). RoHS-compliant, lead-free (PBF).

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 LTC1197LIS8#PBF uniquely delivers true differential input, guaranteed 10-bit no-missing-codes performance, and MSOP-8 footprint at 2.7V - making it optimal for compact, battery-powered precision sensing where input signal integrity and layout simplicity are critical.

Availability

LTC1197LIS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and motor current monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC1197LIS8#PBF 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC1197L series belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for low-power, high-accuracy 10-bit sampling in space- and energy-constrained embedded systems.

FAQ

What is the maximum sampling rate of the LTC1197LIS8#PBF?

The LTC1197LIS8#PBF achieves a maximum sampling rate of 250ksps when operated at VCC = 2.7V and fCLK = 3.5MHz. This is confirmed in the Recommended Operating Conditions table for the LTC1197L variant. At higher supply voltages (e.g., 3.3V), the maximum clock frequency increases, but the device remains rated for 250ksps due to internal timing constraints and thermal limits in the MSOP-8 package.

Does the LTC1197LIS8#PBF support true differential input?

Yes, the LTC1197LIS8#PBF supports true differential analog input via pins 2 (+IN) and 3 (–IN). Unlike pseudo-differential or single-ended ADCs, it measures the voltage difference between these two pins with common-mode rejection and maintains full 10-bit linearity across 0V to VCC common-mode range. This is explicitly documented in the "Description" section and functional block diagram of the datasheet.

What reference voltage options are supported by the LTC1197LIS8#PBF?

The LTC1197LIS8#PBF accepts an external reference voltage applied to the VREF pin (pin 5), supporting 0.2V to VCC + 0.05V. Common configurations include 2.5V (yielding 244µV LSB) or ratiometric connection to a precision voltage divider. The device does not support internal reference or VCC-referenced operation - unlike the LTC1199 family, which ties VREF internally to VCC.

Is the LTC1197LIS8#PBF pin-compatible with other variants in the LTC1197 family?

Yes, the LTC1197LIS8#PBF is pin-compatible with all 8-pin MSOP variants in the LTC1197/LTC1197L family, including LTC1197CMS8, LTC1197IMS8, and LTC1197LCMS8. Pin functions (CS, +IN, –IN, GND, VREF, DOUT, CLK, VCC) are identical across all MSOP-packaged versions. However, electrical specifications (e.g., supply range, max clock, current draw) differ between L (2.7–4V) and non-L (4–9V) variants.

What is the operating temperature range for the LTC1197LIS8#PBF?

The LTC1197LIS8#PBF is specified for operation from –45°C to +85°C. This is indicated by the "I" grade suffix in the part number (LTC1197LIS8#PBF) and confirmed in the "Operating Temperature Range" table, where LTC1197LI and LTC1197LI are listed jointly for –45°C to 85°C. All DC and AC specifications in the datasheet apply across this full range unless otherwise noted.