Analog Devices Inc. LTC1290CCN#PBF

Overview

LTC1290CCN#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 8-channel serial-output sampling data acquisition system with integrated sample-and-hold, successive approximation ADC, and configurable analog multiplexer. It supports single-ended or differential inputs, ±5V common-mode range, 50kHz max throughput, and operates from single 5V or dual ±5V supplies. It is used in industrial sensor monitoring systems requiring precise multi-channel voltage digitization with microprocessor serial interface.

For engineers reviewing the LTC1290CCN#PBF datasheet, LTC1290CCN#PBF pinout, LTC1290CCN#PBF application, or LTC1290CCN#PBF equivalent, key selection considerations include its software-programmable unipolar/bipolar mode, MSB/LSB-first output format, 8/12/16-bit variable word length, on-chip S/H for single-ended channels, and compatibility with MICROWIRE, SPI, and parallel-port-emulated serial interfaces.

Technical Context

The LTC1290CCN#PBF implements an LTCMOS switched-capacitor SAR architecture with a built-in 8:1 analog multiplexer and dedicated sample-and-hold for all single-ended inputs. Its serial interface uses independent ACLK (for conversion timing) and SCLK (for data transfer), enabling asynchronous control of sampling and communication.

It supports four differential or eight single-ended input configurations via software-controlled MUX address bits, with programmable polarity inversion in differential mode. Conversion results are output in 2's complement format in bipolar mode, and the device enters low-power shutdown (<15 µA) when WL1=0/WL0=1 is written to the configuration register.

Key Specifications

Pinout & Package

Package: 20-lead PDIP (Plastic Dual In-line Package), 0.3" wide, through-hole mounting. Pin pitch: 0.1", body width: 0.3", lead count: 20, RoHS-compliant lead finish (#PBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11131ETE+, the LTC1290CCN#PBF uniquely combines integrated S/H, configurable differential/single-ended MUX, bipolar mode, and dual-clock serial interface-making it optimal for cost-sensitive, multi-sensor industrial DAQ where layout space and component count are constrained.

Availability

LTC1290CCN#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, portable data loggers, and motor control feedback systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for LTC1290CCN#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 LTC1290CCN#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for embedded systems requiring flexible, low-component-count analog front-ends with microprocessor serial interfacing.

FAQ

What is the operating temperature range for the LTC1290CCN#PBF?

The LTC1290CCN#PBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is confirmed by the "C" suffix in the part number and specified in the Absolute Maximum Ratings table. The device maintains guaranteed 12-bit no-missing-codes performance and ±1.5 LSB offset error across this full range. Operation outside this range may cause parametric degradation or functional failure.

Does the LTC1290CCN#PBF require an external reference voltage?

Yes, the LTC1290CCN#PBF requires an external reference applied between REF+ and REF– pins. It does not include an internal reference. The reference voltage can range from 1 V to 5 V and directly sets the full-scale input range - e.g., 5 V reference yields 0–5 V unipolar or ±5 V bipolar span. A stable, low-noise reference such as LT1027 is recommended for precision applications.

Can the LTC1290CCN#PBF perform true differential measurements across non-adjacent channels?

No. The LTC1290CCN#PBF supports differential measurements only between adjacent channel pairs: CH0–CH1, CH2–CH3, CH4–CH5, and CH6–CH7. This is defined by the MUX address decoding in Table 1 of the datasheet. Non-adjacent combinations (e.g., CH0–CH3) are not supported in differential mode and will produce invalid or undefined conversion results.

How is power-down mode activated and exited on the LTC1290CCN#PBF?

Power-down is activated by writing WL1=0 and WL0=1 in the configuration word sent to DIN. This places the LTC1290CCN#PBF into sub-15 µA standby. To exit, assert CS low again - the device automatically resumes normal operation and performs the next requested conversion. No reset or reinitialization sequence is needed.

What is the purpose of the ACLK and SCLK signals, and can they share the same clock source?

ACLK controls the internal SAR conversion timing and sample-and-hold acquisition; SCLK synchronizes serial data transfer. They serve independent functions and must not be tied together. ACLK must meet minimum frequency requirements (≥15 kHz at 25°C) to prevent S/H droop; SCLK operates up to 2 MHz. Using one clock for both violates timing specifications and causes conversion errors.