Analog Devices Inc. LTC1199LCMS8#PBF

Overview

LTC1199LCMS8#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 250ksps successive approximation ADC with integrated 2-channel analog multiplexer, single 2.7V supply operation, and auto shutdown. It features SPI/MICROWIRE-compatible 4-wire serial interface, 2.2mW typical power dissipation at full speed, and MSOP-8 package. Used in portable instrumentation for high-resolution voltage monitoring of dual sensor inputs.

For engineers reviewing the LTC1199LCMS8#PBF datasheet, LTC1199LCMS8#PBF pinout, LTC1199LCMS8#PBF application, or LTC1199LCMS8#PBF equivalent, key selection criteria include its 2.7V–4V supply range, software-selectable MUX configuration (single-ended CH0/CH1 or differential), 10-bit no-missing-codes resolution, and guaranteed performance over –40°C to 85°C (L-grade).

Technical Context

The LTC1199LCMS8#PBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold and internal VREF tied to VCC. Its 2-channel MUX supports four configurations: CH0–GND, CH1–GND, CH0–CH1, and CH1–CH0 - selected via 3-bit DIN command after start bit. Conversion timing is fixed at 10.5 clock cycles, with total cycle time of 16 CLKs.

Digital interface operates synchronously on rising CLK edges; CS falling edge initiates transfer, and DOUT becomes active after two null bits. DIN and DOUT can be wired together for 3-wire half-duplex operation, requiring MCU I/O reconfiguration at precise CLK edges to avoid bus contention.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, moisture sensitivity 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 LTC1199LCMS8#PBF uniquely integrates 2-channel MUX, 10-bit resolution, and VCC-referenced operation in an MSOP-8 package - delivering optimal balance of channel flexibility, precision, and board-area efficiency for compact dual-sensor systems.

Availability

LTC1199LCMS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitors, wearable biopotential front-ends, and automotive cabin environment controllers requiring stable component supply and guaranteed long-term availability.

Supply support for LTC1199LCMS8#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 LTC1199 family was designed by Linear Technology (acquired by ADI in 2017) specifically for low-power, high-speed, multi-channel data acquisition in space- and energy-constrained systems - emphasizing integration, supply flexibility, and ease of MCU interfacing.

FAQ

What is the maximum clock frequency supported by the LTC1199LCMS8#PBF?

The LTC1199LCMS8#PBF supports a maximum clock frequency of 3.5MHz when operating from a 2.7V supply. This limit scales with supply voltage - exceeding it risks timing violations, incomplete conversions, or increased INL/DNL error. The device's tCYC is fixed at 16 clock cycles, so fCLK directly determines sampling rate (fSMPL = fCLK / 16).

Does the LTC1199LCMS8#PBF require an external reference voltage?

No, the LTC1199LCMS8#PBF does not require an external reference. It uses an internal reference tied to the VCC pin, making VCC both the supply and reference source. This enables true ratiometric operation - ideal for sensor systems where excitation and reference share the same rail - and eliminates the need for external reference components.

Can the LTC1199LCMS8#PBF perform differential measurements between its two input channels?

Yes, the LTC1199LCMS8#PBF supports differential measurements. When configured via the DIN command word (SGL/DIFF = 0, ODD/SIGN = 0), it measures the voltage difference CH0 – CH1. In this mode, CH0 serves as the positive input and CH1 as the negative input - enabling noise rejection in electrically noisy environments without external instrumentation amplifiers.

What is the operating temperature range of the LTC1199LCMS8#PBF?

The LTC1199LCMS8#PBF is rated for operation from –40°C to +85°C. This L-grade temperature specification is confirmed in the "Order Information" table and applies across all electrical parameters unless otherwise noted. It meets industrial-grade reliability requirements and is suitable for under-hood automotive or outdoor industrial deployments.

How does the auto shutdown feature reduce power consumption in the LTC1199LCMS8#PBF?

The LTC1199LCMS8#PBF automatically enters low-power shutdown between conversions when CS is held high. In this state, supply current drops to ≤3µA - over 250× lower than its 0.8mA active-mode current at 250ksps. Power scales linearly with sampling rate, allowing dynamic adjustment of average power based on system throughput requirements without firmware intervention.