Analog Devices Inc. LTC1278-5CSW#PBF

Overview

LTC1278-5CSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 500ksps sampling analog-to-digital converter with internal reference, synchronized clock, and power-down mode. It operates from single 5V or ±5V supplies, delivers ±1LSB INL/DNL, 70dB S/(N+D) at 100kHz, and supports unipolar (0V–5V) or bipolar (±2.5V) input ranges. Used in high-speed data acquisition systems requiring low-power, precision digitization.

For engineers reviewing the LTC1278-5CSW#PBF datasheet, LTC1278-5CSW#PBF pinout, LTC1278-5CSW#PBF application, or LTC1278-5CSW#PBF equivalent, key selection criteria include guaranteed no missing codes over temperature, 1.6µs conversion time with internal clock synchronization, 8.5mW shutdown power, and parallel 12-bit interface compatibility with DSPs and microprocessors.

Technical Context

The LTC1278-5CSW#PBF implements a successive approximation register (SAR) architecture with integrated 200ns sample-and-hold, factory-trimmed internal 2.42V bandgap reference, and self-synchronizing internal clock-eliminating external clock timing constraints. Its control logic accepts active-low CONVST, CS, and RD signals to support memory-mapped interfacing with microprocessors and FIFOs.

It features high-impedance analog input (±1µA leakage), three-state parallel digital outputs (D11–D0), BUSY status flag, and SHDN-controlled instant wake-up (350ns). Power delivery separates AVDD/DVDD (5V) and VSS (–5V for bipolar), with dedicated AGND and DGND pins to minimize noise coupling between analog and digital domains.

Key Specifications

Pinout & Package

Package: 24-lead plastic SO wide (SW), RoHS-compliant, surface-mount. Thermal resistance θ_JA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1166BCAP+, the LTC1278-5CSW#PBF uniquely combines 500ksps parallel throughput, ±1LSB linearity, internal synchronized clock, and dual-supply bipolar operation - making it optimal for precision, high-throughput embedded acquisition where timing determinism and input flexibility are critical.

Availability

LTC1278-5CSW#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, digital signal processing, and multiplexed industrial sensor systems requiring stable component supply and long-term manufacturability.

Supply support for LTC1278-5CSW#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 LTC1278-5CSW#PBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for applications demanding low-power, high-linearity, and deterministic timing in industrial, instrumentation, and communications systems.

FAQ

What is the maximum sampling rate supported by the LTC1278-5CSW#PBF?

The LTC1278-5CSW#PBF supports a maximum sampling rate of 500ksps, corresponding to a minimum throughput time of 2.0µs. This is achieved using its internal factory-trimmed clock and 200ns acquisition time. The -5 suffix explicitly denotes the 500ksps speed grade, distinguishing it from the 400ksps LTC1278-4 variant. Performance is guaranteed over the commercial temperature range (0°C to 70°C).

Does the LTC1278-5CSW#PBF require an external clock source?

No, the LTC1278-5CSW#PBF does not require an external clock. It integrates a factory-trimmed internal clock that automatically synchronizes to each CONVST command, eliminating asynchronous clock noise and simplifying system timing design. The typical conversion time is fixed at 1.6µs, and no external clock connections or adjustments are needed for full-spec operation.

Can the LTC1278-5CSW#PBF operate in bipolar mode with ±5V supplies?

Yes, the LTC1278-5CSW#PBF supports true bipolar operation with ±5V supplies (AVDD = +5V, VSS = –5V), delivering a ±2.5V analog input range. This mode uses two's complement output coding and requires separate AGND and DGND connections. The internal 2.42V reference remains active, and the VREF pin may be overdriven externally to adjust full-scale span while maintaining accuracy.

What is the power consumption of the LTC1278-5CSW#PBF in shutdown mode?

In shutdown mode (SHDN pin driven low), the LTC1278-5CSW#PBF draws 1.7–3.0mA total supply current and dissipates 8.5–15mW. This represents a >90% reduction from its active 75mW typical dissipation. Wake-up latency is guaranteed at 350ns, enabling rapid reactivation during short idle periods without sacrificing system responsiveness.

How is the analog input protected against overvoltage in the LTC1278-5CSW#PBF?

The LTC1278-5CSW#PBF includes internal clamping diodes on the AIN pin that activate when voltage exceeds AVDD or falls below VSS by more than 50mV. It can safely handle transient currents exceeding 60mA without latch-up. For robust protection, external series resistance and TVS devices are recommended in harsh environments, especially when AIN connects to field wiring outside the PCB.