Analog Devices Inc. LTC1290DISW#PBF

Overview

LTC1290DISW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 8-channel sampling data acquisition system IC with integrated successive approximation ADC, analog multiplexer, and sample-and-hold. It supports configurable single-ended or differential inputs, ±5V common-mode range, 50kHz max throughput, and serial I/O compatible with MICROWIRE/SPI interfaces. Used in industrial sensor signal conditioning and embedded data logging systems.

For engineers reviewing the LTC1290DISW#PBF datasheet, LTC1290DISW#PBF pinout, LTC1290DISW#PBF application, or LTC1290DISW#PBF equivalent, key selection criteria include bipolar/unipolar conversion mode, 12-bit resolution with guaranteed no missing codes, software-programmable word length (8/12/16-bit), power shutdown capability, and 20-lead SO Wide package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The LTC1290DISW#PBF implements an LTCMOS switched-capacitor SAR architecture with on-chip sample-and-hold for all single-ended channels. Its 8-channel analog MUX supports four differential or eight single-ended input configurations via software-controlled address bits, with independent COM reference pin for single-ended zero-reference alignment.

Serial interface operates in full-duplex mode using SCLK, DIN, DOUT, and CS signals; supports MSB-first or LSB-first data sequencing and automatic 2's complement coding in bipolar mode. ACLK controls internal conversion timing (max 4MHz), while SCLK governs serial transfer rate (max 2MHz), enabling direct interfacing to MC68HC05C4, COP402, and other synchronous serial microprocessors without glue logic.

Key Specifications

Pinout & Package

Package: 20-lead plastic SO Wide (SW), 0.300" wide body, gull-wing leads, RoHS-compliant #PBF marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar data acquisition applications.

Compared with ADS8320IPW and MAX11607EEE+, the LTC1290DISW#PBF uniquely integrates MUX, S/H, and flexible serial interface in a single 20-pin SOIC, enabling compact, self-contained 12-bit DAQ subsystems without external timing or level-shifting components.

Availability

LTC1290DISW#PBF is available at Aetrix Electronics and suitable for industrial automation, motor control, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for LTC1290DISW#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, formed through the acquisition of Linear Technology in 2017.

The LTC1290DISW#PBF belongs to ADI's legacy Linear Technology data acquisition product line, designed specifically for embedded systems requiring integrated, software-configurable analog front-ends with minimal external components and robust industrial-grade reliability.

FAQ

What is the operating temperature range specified for the LTC1290DISW#PBF?

The LTC1290DISW#PBF is rated for operation from –40°C to +85°C (Grade I). This specification is validated across all electrical parameters including offset error (±1.5LSB), linearity (±0.5LSB), and conversion time (13µs max), ensuring consistent performance in industrial control cabinets, outdoor telemetry units, and automotive under-hood environments where ambient temperatures exceed commercial grade limits.

Does the LTC1290DISW#PBF support true differential input measurements across all eight channels?

No - the LTC1290DISW#PBF supports differential measurements only across four adjacent channel pairs: CH0–CH1, CH2–CH3, CH4–CH5, and CH6–CH7. The MUX configuration allows either four differential inputs or eight single-ended inputs relative to the COM pin, but not arbitrary differential combinations like CH3–CH7. This limitation is defined in Table 1 of the datasheet and enforced by the internal analog switch matrix routing.

How does the power shutdown feature work in the LTC1290DISW#PBF?

The LTC1290DISW#PBF enters power shutdown when the WL1=0 and WL0=1 bits are set in the DIN configuration word. In this state, analog circuitry (MUX, S/H, ADC core) is disabled, reducing ICC to <15µA. A "dummy" conversion must be initiated first to clock out the prior result as a 10-bit word; subsequent conversions resume automatically upon next CS assertion or SCLK activity, with full functionality restored within one ACLK cycle.

Can the LTC1290DISW#PBF interface directly with an Arduino Uno's SPI port without level shifters?

Yes - the LTC1290DISW#PBF accepts 5V-tolerant digital inputs (VIH = 2.0V min, VIL = 0.8V max) and drives DOUT to VOH ≥ 4.7V at 10µA, matching Arduino Uno's 5V SPI signaling levels. Configure the LTC1290DISW#PBF for MSB-first, 12-bit word length, and use Arduino's SPI.beginTransaction() with MODE0 (CPOL=0, CPHA=0) to align with LTC1290's SCLK sampling on rising edge and data output on falling edge.

What is the maximum recommended source impedance for analog inputs on the LTC1290DISW#PBF?

The LTC1290DISW#PBF specifies a maximum source resistance of 1kΩ for full 12-bit accuracy at 25°C, based on S&H acquisition time (TPC11) and ACLK frequency derating (TPC09). At 85°C, ACLK should be ≥125kHz and source impedance reduced to ≤300Ω to maintain 0.02% acquisition settling and prevent gain/linearity errors exceeding 0.5LSB due to increased leakage and reduced S/H drive strength.