Analog Devices Inc. LTC1272-3CCSW#TRPBF

Overview

LTC1272-3CCSW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 3 µs successive approximation ADC with integrated sample-and-hold and on-chip 2.42 V ±1% reference. It operates from a single 5 V supply, delivers up to 250 kHz sampling rate, and maintains 72.1 dB S/(N+D) at 10 kHz input-enabling high-speed data acquisition in DSP and industrial control systems.

For engineers reviewing the LTC1272-3CCSW#TRPBF datasheet, LTC1272-3CCSW#TRPBF pinout, LTC1272-3CCSW#TRPBF application, or LTC1272-3CCSW#TRPBF equivalent, this page provides verified pin functions, real-world timing constraints (e.g., 1 µs minimum inter-conversion delay), dynamic performance metrics (ENOB ≥11.5 at 20 kHz), and drop-in compatibility guidance with AD7572 sockets under defined reference capacitor polarity and acquisition time conditions.

Technical Context

The LTC1272-3CCSW#TRPBF implements a switched-capacitor SAR architecture with internal 12-bit capacitive DAC and comparator-based bit decision logic synchronized to a 4 MHz clock. Its sample-and-hold phase acquires the analog input within 0.45–1 µs, followed by a 13-clock-cycle conversion phase ending with latched 12-bit parallel output.

It features dual digital interface modes: Slow Memory Mode (conversion starts on RD/CS low, outputs previous result then updates) and ROM Mode (outputs prior result while converting new sample). HBEN enables byte-multiplexed 8-bit reads by routing MSBs to D11–D8 and LSBs to D7–D0/8.

Key Specifications

Pinout & Package

Package: 24-lead plastic SO wide (SW), 0.300" body width, RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7572KNZ and MAX11200EEE+, the LTC1272-3CCSW#TRPBF uniquely balances 3 µs speed, single-supply operation, and AD7572 pin compatibility-making it optimal for upgrading legacy systems or designing new cost-sensitive, medium-speed data loggers without sacrificing interface simplicity.

Availability

LTC1272-3CCSW#TRPBF is available at Aetrix Electronics and suitable for industrial data acquisition, DSP-based signal processing, and multiplexed sensor systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC1272-3CCSW#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, serving industrial, automotive, communications, and healthcare markets.

The LTC1272-3CCSW#TRPBF belongs to ADI's legacy Linear Technology precision data converter family, engineered for high-speed, single-supply, pin-compatible upgrades of industry-standard ADCs in space- and cost-constrained embedded systems.

FAQ

What is the maximum sampling rate achievable with the LTC1272-3CCSW#TRPBF?

The LTC1272-3CCSW#TRPBF supports a maximum sustained sampling rate of 250 kHz, enabled by its 3 µs conversion time and 1 µs minimum inter-conversion delay. This rate assumes proper clock synchronization (≥40 ns separation between RD falling edge and CLK IN edges) and adequate analog input settling after the 0.45–1 µs acquisition window. At 250 kHz, the device maintains 72.1 dB S/(N+D) and ≥11.5 ENOBs up to 20 kHz input frequency.

Can the LTC1272-3CCSW#TRPBF directly replace an AD7572 in an existing PCB layout?

Yes, the LTC1272-3CCSW#TRPBF is designed for AD7572 socket compatibility, but two modifications are mandatory: reverse the polarity of the reference bypass capacitor (since LTC1272-3CCSW#TRPBF outputs +2.42 V vs. AD7572's –5.25 V), and ensure ≥1 µs acquisition time between conversions. Pin 23 (NC on LTC1272-3CCSW#TRPBF) remains unconnected, eliminating the AD7572's –15 V requirement.

How does the HBEN pin affect data readout on the LTC1272-3CCSW#TRPBF?

The HBEN pin on the LTC1272-3CCSW#TRPBF controls data bus multiplexing: when LOW, all 12 bits (DB11–DB0) appear on D11–D4 and D3/11–D0/8 for parallel read; when HIGH, only the 4 MSBs (DB11–DB8) drive D11–D8, while D7–D0/8 output LOW-enabling two-byte reads on 8-bit microcontrollers. This eliminates external multiplexers and simplifies firmware for resource-constrained systems.

What is the purpose of the NC pin (Pin 23) on the LTC1272-3CCSW#TRPBF?

Pin 23 on the LTC1272-3CCSW#TRPBF is Not Connected internally and serves as a mechanical placeholder for AD7572's –15 V supply pin. It can safely remain unconnected or tied to ground in new designs. Unlike the AD7572, the LTC1272-3CCSW#TRPBF operates from a single 5 V supply, making this pin electrically irrelevant-no voltage or current should be applied to it.

Does the LTC1272-3CCSW#TRPBF require an external clock source, or can it operate with a crystal?

The LTC1272-3CCSW#TRPBF supports both configurations: a 4 MHz crystal or ceramic resonator may be connected between CLK IN (Pin 17) and CLK OUT (Pin 18) for self-contained timing, or an external 4 MHz TTL/CMOS clock can be driven into CLK IN alone. The CLK OUT pin delivers an inverted copy of CLK IN and must be kept low-capacitance (<15 pF) to prevent analog feedthrough that degrades SNR in the LTC1272-3CCSW#TRPBF.