Analog Devices Inc. LTC1272-8CCSW#TRPBF

Overview

LTC1272-8CCSW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 8 µs conversion time, single-supply sampling analog-to-digital converter with on-chip sample-and-hold and internal 2.42 V reference. It operates from a 5 V supply only, delivers up to 111 kHz sampling rate, and maintains ±1 LSB integral linearity over 0°C to 70°C. It serves as a drop-in replacement for AD7572 in data acquisition systems requiring fast, precision unipolar digitization of 0 V to 5 V analog inputs.

For engineers reviewing the LTC1272-8CCSW#TRPBF datasheet, LTC1272-8CCSW#TRPBF pinout, LTC1272-8CCSW#TRPBF application, or LTC1272-8CCSW#TRPBF equivalent, this page provides verified timing parameters, validated pin functions, confirmed 24-pin SO Wide package mapping, real-world dynamic performance (S/(N+D) = 72 dB at 10 kHz), and precise substitution guidance versus AD7572 and LTC1272-3 variants.

Technical Context

The LTC1272-8CCSW#TRPBF implements a successive approximation register (SAR) architecture with integrated switched-capacitor sample-and-hold and curvature-corrected bandgap reference. Its 8 µs conversion time corresponds to a maximum 111 kHz sampling rate using a 1.6 MHz external clock or crystal oscillator.

It supports two digital interface modes - Slow Memory Mode (conversion start and data read synchronized) and ROM Mode (read previous result while converting next) - and offers flexible 12-bit output formatting via HBEN-controlled multiplexing between full 12-bit parallel and two 8-bit byte reads.

Key Specifications

Pinout & Package

Package: 24-lead plastic SO wide (SW), RoHS-compliant, JEDEC MS-013AC, body width 7.5 mm, thermal resistance θ_JA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with AD7572KNZ, LTC1272-8CCSW#TRPBF eliminates negative supply and external S/H while delivering better linearity and lower power; compared with LTC1272-3CCSW#TRPBF, it trades speed for reduced clock frequency sensitivity and lower EMI susceptibility at 1.6 MHz.

Availability

LTC1272-8CCSW#TRPBF is available at Aetrix Electronics and suitable for industrial data acquisition, DSP front-end interfaces, multiplexed sensor systems, and single-supply embedded instrumentation requiring stable component supply across extended production lifecycles.

Supply support for LTC1272-8CCSW#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 semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC1272 family was developed by Linear Technology to deliver pin-compatible, enhanced-performance replacements for industry-standard 12-bit SAR ADCs-specifically targeting cost-sensitive, space-constrained, and single-supply data acquisition applications.

FAQ

What is the maximum sampling rate supported by the LTC1272-8CCSW#TRPBF?

The LTC1272-8CCSW#TRPBF supports a maximum sampling rate of 111 kHz, derived from its 8 µs typical conversion time. This assumes sufficient inter-conversion delay (≥1 µs) and proper clock synchronization. At this rate, the device achieves 72 dB S/(N+D) with a 10 kHz input signal, corresponding to 11.5 effective bits of resolution below 20 kHz.

Can the LTC1272-8CCSW#TRPBF replace the AD7572 in an existing design without hardware changes?

Yes, the LTC1272-8CCSW#TRPBF is pin-compatible with the AD7572 and fits into the same 24-pin socket. However, two modifications are required: reverse the polarity of the VREF bypass capacitor (due to +2.42 V vs. –5.25 V reference), and leave Pin 23 (NC) unconnected since the LTC1272-8CCSW#TRPBF does not require a negative supply.

What clock frequency is required for the LTC1272-8CCSW#TRPBF?

The LTC1272-8CCSW#TRPBF requires a 1.6 MHz clock for nominal operation, either from an external source applied to CLK IN or from a crystal/resonator connected between CLK IN and CLK OUT. The clock duty cycle is not critical, but rise/fall times should be ≤5 ns for reliable timing margin across temperature.

Does the LTC1272-8CCSW#TRPBF include an internal reference, and can it drive external circuitry?

Yes, the LTC1272-8CCSW#TRPBF integrates a factory-trimmed 2.42 V ±1% bandgap reference with 25 ppm/°C tempco, available at Pin 2 (VREF). It can source up to 1 mA of load current, making it suitable for biasing external op-amps or serving as a precision reference for companion DACs in the same system.

How does the HBEN pin affect data output formatting on the LTC1272-8CCSW#TRPBF?

The HBEN pin controls multiplexing of the 12-bit conversion result onto the data bus. When HBEN = LOW, all 12 bits appear simultaneously on D11–D0/8. When HBEN = HIGH, only the upper 4 bits (DB11–DB8) appear on D11–D8, while D7–D0/8 output LOW - enabling sequential 8-bit reads for compatibility with 8-bit microcontrollers.