Analog Devices Inc. LTC1864LACMS8#TRPBF

Overview

LTC1864LACMS8#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps single-channel differential successive approximation ADC operating from a single 3V supply in an 8-lead MSOP package. It features true differential analog inputs (IN+, IN–), external reference pin (VREF), auto-shutdown reducing supply current to 10µA at 1ksps, and SPI/MICROWIRE-compatible 3-wire serial interface. It targets high-precision, low-power data acquisition in portable instrumentation and isolated sensing systems.

For engineers reviewing the LTC1864LACMS8#TRPBF datasheet, LTC1864LACMS8#TRPBF pinout, LTC1864LACMS8#TRPBF application, or LTC1864LACMS8#TRPBF equivalent, key selection criteria include its 16-bit no-missing-codes resolution, ±8 LSB INL, 82 dB SNR, 150 kHz max sampling rate, and MSOP-8 thermal performance (θ_JA = 210°C/W) - all critical for battery-powered, space-constrained signal chain designs requiring ratiometric or externally referenced measurement accuracy.

Technical Context

The LTC1864LACMS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, enabling precise unipolar differential conversion over 0 V to V_REF full-scale range. Its analog input structure supports high-impedance sources and reduced spans down to 1 V, eliminating need for external gain stages in many sensor interfaces.

Operation is controlled via a single CONV input: rising edge initiates conversion; falling edge enables SDO output and synchronizes serial data transfer on SCK falling edges. The device automatically powers down between conversions, delivering ultra-low quiescent current (450 µA typ at 150 ksps) without minimum data rate constraints.

Key Specifications

Pinout & Package

Package: 8-lead plastic MSOP (MS8), 3.0 mm × 3.0 mm × 0.86 mm, lead pitch 0.65 mm, θ_JA = 210°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with AD7980ACPZ-RL7 and LTC2378-16IMS#PBF, the LTC1864LACMS8#TRPBF uniquely balances ultra-low standby current (10 µA), external reference flexibility (1 V to 3.6 V), and proven MSOP-8 reliability - making it optimal for battery-powered, size-constrained, and ratiometric measurement applications where 150 ksps suffices.

Availability

LTC1864LACMS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and low-power sensor node applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for LTC1864LACMS8#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 LTC1864L series belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for low-power, high-resolution, space-constrained measurement systems operating from single-supply batteries or isolated rails.

FAQ

What is the operating temperature range of the LTC1864LACMS8#TRPBF?

The LTC1864LACMS8#TRPBF is specified for commercial-grade operation from 0°C to 70°C. This is confirmed by the "AC" suffix in the part number per Linear Technology's ordering guide, distinguishing it from "AI" (–40°C to 85°C) and "C" (0°C to 70°C) variants. The device's thermal resistance (θ_JA = 210°C/W) and 400 mW power dissipation rating ensure reliable operation within this range under typical PCB layouts.

Does the LTC1864LACMS8#TRPBF require an external reference, and what voltage range is supported?

Yes, the LTC1864LACMS8#TRPBF requires an external reference applied to the VREF pin. It supports reference voltages from 1 V to V_CC (up to 3.6 V), enabling ratiometric measurements with sensor bridges or flexible full-scale scaling. Unlike the SO-8 version of LTC1865L, the LTC1864LACMS8#TRPBF does not tie VREF internally to VCC - external reference is mandatory and must be low-noise and well-bypassed.

How does the CONV pin control conversion and data readout on the LTC1864LACMS8#TRPBF?

The CONV pin serves dual functions: a rising edge initiates conversion (t_CONV ≈ 3.7–4.66 µs), and a falling edge enables the SDO output and synchronizes serial data transfer. After conversion completes, holding CONV high places the device in auto-shutdown mode (10 µA). No separate chip select or read strobe is needed - the interface uses only CONV, SCK, and SDO pins.

Can the LTC1864LACMS8#TRPBF interface directly with a microcontroller GPIO without level-shifting?

Yes - the LTC1864LACMS8#TRPBF is fully compatible with 3V logic microcontrollers. Its digital inputs (CONV, SCK) accept VIH ≥ 1.9 V and VIL ≤ 0.45 V at V_CC = 2.7 V, and outputs (SDO) drive VOH ≥ 2.3 V and VOL ≤ 0.3 V at I_O = 400 µA. No level-shifting is required when interfacing with 3V MCUs such as STM32L4 or MSP430FRxx families.

What is the maximum clock frequency supported on the SCK pin of the LTC1864LACMS8#TRPBF?

The LTC1864LACMS8#TRPBF supports a maximum SCK frequency of 8 MHz, as specified in the Recommended Operating Conditions table. At this rate, the full 16-bit word can be read in ≤2 µs after CONV falls. Timing parameters including t_WHCLK, t_WLCLK, and t_dDO are guaranteed across the full 0°C to 70°C range, ensuring robust serial communication in demanding environments.