Analog Devices Inc. LTC1865LAIMS#PBF

Overview

LTC1865LAIMS#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps, 2-channel software-selectable multiplexed successive approximation ADC in an 8-lead MSOP package, operating from a single 2.7V–3.6V supply with 450µA typical supply current at full speed and auto-shutdown to 10µA at 1ksps. It features true differential or single-ended input modes, external reference support (1V to VCC), SPI/MICROWIRE-compatible serial interface, and is designed for high-precision, low-power data acquisition in portable instrumentation.

For engineers reviewing the LTC1865LAIMS#PBF datasheet, LTC1865LAIMS#PBF pinout, LTC1865LAIMS#PBF application, or LTC1865LAIMS#PBF equivalent, key selection criteria include its 16-bit resolution with ±6 LSB INL, 82dB SNR, 2-channel MUX configurability via SDI, MSOP-8 thermal performance (θ_JA = 210°C/W), and compatibility with ratiometric or precision external references.

Technical Context

The LTC1865LAIMS#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both differential and single-ended analog input configurations via a 2-bit SDI control word. Its conversion timing is fixed at 3.7–4.66µs, synchronized by CONV rising edge, with serial data output on SDO aligned to SCK falling edge.

It uses separate AGND and DGND pins in the MSOP package to minimize digital switching noise coupling into the analog path, and requires tight bypassing (≥1µF tantalum) on VCC and VREF to maintain 82dB SNR and ±6 LSB INL across temperature. Reference voltage range is 1V to VCC, enabling flexible scaling from reduced spans up to rail-to-rail operation when VREF = VCC.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm pitch, θ_JA = 210°C/W, rated for –40°C to +85°C operation (I-grade).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IDRCT and LTC2311CDHC-16#TRPBF, the LTC1865LAIMS#PBF uniquely integrates a 2-channel MUX with full differential capability and 1V–VCC reference support in an ultra-low-power MSOP-8 package-making it optimal for compact, battery-operated, multi-sensor systems where board space and energy efficiency are critical.

Availability

LTC1865LAIMS#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, and isolated remote data acquisition requiring stable component supply, guaranteed long-term availability, and traceable sourcing.

Supply support for LTC1865LAIMS#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 LTC1865LAIMS#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for low-power, high-resolution sensing in space- and energy-constrained applications where accuracy, small size, and supply flexibility are essential.

FAQ

What is the operating temperature range for the LTC1865LAIMS#PBF?

The LTC1865LAIMS#PBF is rated for –40°C to +85°C ambient operation (I-grade). This is confirmed in the "Operating Temperature Range" section of the datasheet, where "LTC1865LI" and "LTC1865LAI" denote the –40°C to +85°C variants, and the "AIMS" suffix explicitly maps to the MSOP package with Industrial temperature grade. Thermal derating begins above +85°C per absolute maximum ratings.

Does the LTC1865LAIMS#PBF support true differential input mode?

Yes, the LTC1865LAIMS#PBF supports true differential input mode via its 2-bit SDI-controlled MUX. As specified in Table 1 ("Multiplexer Channel Selection"), selecting "SGL/DIFF = 0" and "ODD/SIGN = 0" configures CH0 as "+" and CH1 as "–", enabling differential measurement of CH0–CH1. Both inputs are sampled simultaneously, providing inherent common-mode noise rejection.

What is the minimum reference voltage supported by the LTC1865LAIMS#PBF?

The LTC1865LAIMS#PBF supports a minimum reference voltage of 1V, as stated in the "VREF Input Range" specification for the MSOP version: "1 VCC". This applies across the full operating temperature range and enables direct interfacing with low-voltage sensors or precision references like the LT1460, eliminating the need for level-shifting circuitry.

Can the LTC1865LAIMS#PBF operate with VREF tied to VCC?

Yes, the LTC1865LAIMS#PBF can operate with VREF tied to VCC. The datasheet specifies "VREF Input Range: 1 to VCC" for the MSOP package, and Figure 5 ("LTC1865L Transfer Curve") shows full-scale output occurring at VIN = VCC – 1LSB. This configuration yields a rail-to-rail input span when the "–" input is grounded, simplifying design in single-supply systems.

What is the conversion time of the LTC1865LAIMS#PBF?

The conversion time of the LTC1865LAIMS#PBF is 3.7µs (minimum) to 4.66µs (maximum), as specified in the "Timing Characteristics" table under parameter "tCONV". This fixed conversion latency occurs after the rising edge of CONV and is independent of sampling frequency or reference voltage, ensuring deterministic timing for real-time control loops.