Analog Devices Inc. LTC1272-3CCSW#PBF

Overview

LTC1272-3CCSW#PBF 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 dB S/(N+D) at 10 kHz input - enabling high-speed data acquisition in DSP and multiplexed systems.

For engineers reviewing the LTC1272-3CCSW#PBF datasheet, LTC1272-3CCSW#PBF pinout, LTC1272-3CCSW#PBF application, or LTC1272-3CCSW#PBF equivalent, this page provides verified pin functions, timing-critical control logic (CS/RD/HBEN), unipolar 0–5 V input interface details, and drop-in compatibility guidance versus AD7572 - all grounded in the official LTC1272 datasheet Rev. F.

Technical Context

The LTC1272-3CCSW#PBF implements a switched-capacitor SAR architecture with internal 12-bit capacitive DAC and comparator-based bit decision sequencing. Conversion begins on CS/RD falling edges, proceeds over 12–13 clock cycles (at 4 MHz), and completes with latched 12-bit output available on three-state parallel bus pins D11–D0/8.

Its analog front-end features a 300 Ω / 2.7 kΩ input divider enabling full 0–5 V unipolar range from 4.5–5.25 V supply, while the curvature-corrected bandgap reference provides 25 ppm/°C tempco and supports ≤1 mA load. Clock synchronization requires ≥40 ns separation between RD edge and nearest CLK IN edge to suppress feedthrough.

Key Specifications

Pinout & Package

Package: 24-lead plastic SO wide (SW), RoHS-compliant lead-free finish (#PBF), JEDEC MS-013AC footprint, 110°C max junction temperature, θ_JA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7572KNZ, LTC1272-3CCSW#PBF delivers 4× faster conversion and eliminates negative supply dependency; compared with MAX11200EEE+, it provides 250× higher throughput and native 8/16-bit parallel interface - making it uniquely suited for embedded real-time acquisition where speed, simplicity, and bus compatibility are critical.

Availability

LTC1272-3CCSW#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, DSP-based signal analysis, single-supply instrumentation, and multiplexed sensor systems requiring stable component supply and long-term obsolescence management.

Supply support for LTC1272-3CCSW#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 LTC1272 series belongs to ADI's precision data acquisition product line, designed specifically for high-speed, single-supply, pin-compatible upgrades to legacy 12-bit ADCs in industrial, test, and measurement equipment.

FAQ

What is the maximum sampling rate supported by the LTC1272-3CCSW#PBF?

The LTC1272-3CCSW#PBF supports a maximum sampling rate of 250 kHz, achieved with its 3 µs conversion time and proper timing margin between conversions (minimum 1 µs delay). This rate is validated under conditions of f_CLK = 4 MHz, V_DD = 5 V, and T_A = 25°C, and is sustained across the full 0°C to 70°C operating range specified for the CC grade.

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

Yes, the LTC1272-3CCSW#PBF is pin-compatible with the AD7572 and fits the same 24-lead PDIP or SO wide footprint. However, successful drop-in replacement requires reversing the polarity of the VREF bypass capacitor and leaving Pin 23 (NC) unconnected - since the LTC1272-3CCSW#PBF operates from a single 5 V supply and does not require the AD7572's –15 V rail.

How does the HBEN pin affect data output formatting on the LTC1272-3CCSW#PBF?

When HBEN = LOW, the LTC1272-3CCSW#PBF outputs the full 12-bit result (DB11–DB0) across pins D11–D0/8 for parallel read. When HBEN = HIGH, it multiplexes the upper 4 bits (DB11–DB8) onto both D11–D8 and D3/11–D0/8, enabling two 8-bit reads - first for DB7–DB0, then for DB11–DB8 - ideal for 8-bit microcontrollers with limited I/O.

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

Pin 23 on the LTC1272-3CCSW#PBF is Not Connected internally and replaces the AD7572's –15 V supply pin. It is electrically isolated and may be left floating or tied to ground per PCB layout best practices. Its presence maintains mechanical compatibility with AD7572 sockets while eliminating the need for negative supply generation in new designs.

Does the LTC1272-3CCSW#PBF include an internal reference, and what are its key specs?

Yes, the LTC1272-3CCSW#PBF integrates a factory-trimmed, curvature-corrected bandgap reference delivering 2.42 V ±1% at Pin 2. It exhibits 25 ppm/°C tempco over temperature, supports up to 1 mA load, and requires external decoupling (10 µF tantalum + 0.1 µF ceramic) to achieve specified dynamic performance - including 72 dB S/(N+D).