Analog Devices Inc. LTC1275ACSW#TRPBF

Overview

LTC1275ACSW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 300ksps successive-approximation ADC with ±2.5V bipolar input range, on-chip 2.42V reference, internal synchronized clock, and 24-pin SO Wide package. It draws 75mW typical power, achieves ±1/2LSB INL and ±3/4LSB DNL (A-grade), and delivers 70dB S/(N+D) at 150kHz Nyquist frequency - used in high-speed data acquisition systems requiring precision analog-to-digital conversion under ±5V dual supplies.

For engineers reviewing the LTC1275ACSW#TRPBF datasheet, LTC1275ACSW#TRPBF pinout, LTC1275ACSW#TRPBF application, or LTC1275ACSW#TRPBF equivalent, key selection criteria include verified ±2.5V input compliance, 24-pin SW package footprint, A-grade DC accuracy specs, internal reference tempco ≤±25ppm/°C, and parallel 12-bit bus timing compatibility with microprocessor interfaces.

Technical Context

The LTC1275ACSW#TRPBF implements a 12-bit successive approximation register (SAR) architecture with integrated sample-and-hold, capacitive DAC, and comparator. Its internal clock is factory-trimmed to guarantee ≤2.7µs conversion time and automatic synchronization eliminates asynchronous clock noise.

Digital interface uses active-low CS and RD with HBEN for byte-multiplexed 12-bit output (D11–D0/8), BUSY status flag, and three-state drivers. Analog input operates over ±2.5V range with 50pF sample-mode capacitance and ±1µA leakage, supported by separate AGND/DGND pins and ESD protection on all pins.

Key Specifications

Pinout & Package

Package: 24-lead plastic SO wide (SW), 0.300" body width, RoHS-compliant lead-free (#PBF) with tape-and-reel delivery (#TRPBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7800U and MAX1166BCPP+, the LTC1275ACSW#TRPBF offers 2× higher throughput, tighter DC accuracy (±1/2LSB vs ±1LSB), and integrated clock synchronization - critical for deterministic timing in real-time control loops.

Availability

LTC1275ACSW#TRPBF is available at Aetrix Electronics and suitable for industrial data acquisition, audio test equipment, spectrum analyzer front-ends, and DSP-based motor control requiring stable component supply and long-term production continuity.

Supply support for LTC1275ACSW#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 LTC1275ACSW#TRPBF belongs to Linear Technology's legacy precision data acquisition product line, designed specifically for high-speed, low-power, self-contained 12-bit SAR ADC applications in space-constrained industrial systems.

FAQ

What is the operating temperature range for the LTC1275ACSW#TRPBF?

The LTC1275ACSW#TRPBF is specified for commercial operation from 0°C to 70°C. This range applies to all A-grade DC specifications including ±1/2LSB INL and ±3/4LSB DNL, as well as AC performance metrics like 70dB S/(N+D) at Nyquist. The device uses LTBiCMOS process technology optimized for stability across this ambient range.

Does the LTC1275ACSW#TRPBF require an external clock source?

No, the LTC1275ACSW#TRPBF does not require an external clock source. It features an internally trimmed clock that automatically synchronizes to each RD command, eliminating clock routing complexity and jitter sensitivity. The internal clock guarantees ≤2.7µs conversion time and supports the full 300ksps sampling rate without external timing components.

How is the analog input range configured for the LTC1275ACSW#TRPBF?

The LTC1275ACSW#TRPBF is factory-configured for ±2.5V bipolar input range when operated from ±5V supplies (VDD = +5V, VSS = –5V). This range is fixed by internal scaling and cannot be reconfigured via pins or registers. The AIN pin accepts signals from –2.5V to +2.5V relative to AGND, with absolute limits of VSS – 0.3V to VDD + 0.3V per absolute maximum ratings.

What decoupling is required for the VREF pin on the LTC1275ACSW#TRPBF?

The VREF pin (Pin 2) of the LTC1275ACSW#TRPBF must be decoupled to AGND with a 10µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor. This dual-capacitor network suppresses both low-frequency drift and high-frequency noise, ensuring stable 2.42V reference output and minimizing code transition noise. Failure to implement this decoupling degrades S/(N+D) by up to 6dB.

Can the LTC1275ACSW#TRPBF interface directly with a microprocessor data bus?

Yes, the LTC1275ACSW#TRPBF interfaces directly with standard microprocessor data buses via its parallel 12-bit output (D11–D0/8), active-low CS and RD controls, and BUSY status flag. Its three-state outputs meet TTL/CMOS voltage levels, and timing parameters (e.g., t3 = 110ns data access) align with common 8051, ARM7, and DSP bus cycles - no level shifters or latches required.