Analog Devices Inc. LTC1276BCN#PBF

Overview

LTC1276BCN#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 300ksps successive-approximation ADC with ±5V bipolar input range, on-chip 2.42V reference, internal synchronized clock, and 24-pin narrow PDIP package. It draws 75mW typical power, achieves ±1/2LSB INL and ±3/4LSB DNL max, 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 supplies.

For engineers reviewing the LTC1276BCN#PBF datasheet, LTC1276BCN#PBF pinout, LTC1276BCN#PBF application, or LTC1276BCN#PBF equivalent, key selection considerations include its ±5V input range compatibility, 24-pin PDIP footprint, internal reference stability (±5ppm/°C), 2.7µs conversion time, and parallel 12-bit output interface for microprocessor/DSP integration.

Technical Context

The LTC1276BCN#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold (600ns acquisition time), 12-bit capacitive DAC, and high-speed comparator. Its internal clock is factory-trimmed to ensure 300ksps sampling without external timing components.

Digital interface uses active-low CS and RD signals with HBEN-controlled byte multiplexing (D11–D0/8), BUSY status flag, and three-state parallel outputs. Input range is fixed at ±5V when operated from ±4.95V to ±5.25V supplies, with analog input leakage ≤±1µA and input capacitance of 5pF (hold mode).

Key Specifications

Pinout & Package

Package: 24-lead narrow plastic DIP (N package), 0.300" wide, through-hole mount, JEDEC MS-001 compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, ±5V-input ADC applications.

Compared with ADS7800KP and MAX195BCPP, the LTC1276BCN#PBF uniquely combines 300ksps speed, ±5V input, internal reference, and 24-pin PDIP in a single device - enabling faster system response, reduced component count, and drop-in replacement in legacy 24-pin socketed designs.

Availability

LTC1276BCN#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, audio signal processing, and telecom channel monitoring requiring stable component supply, long-term obsolescence management, and RoHS-compliant through-hole packaging.

Supply support for LTC1276BCN#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, serving industrial, automotive, communications, and healthcare markets.

The LTC1276BCN#PBF belongs to Linear Technology's legacy high-speed precision ADC family, designed specifically for applications demanding ±5V bipolar input compatibility, internal reference stability, and minimal external component count in space-constrained industrial systems.

FAQ

What is the operating temperature range for the LTC1276BCN#PBF?

The LTC1276BCN#PBF is rated for 0°C to 70°C commercial operation (B grade). Its specifications - including ±1/2LSB INL, ±3/4LSB DNL, and 2.42V reference stability - are guaranteed across this full range. The device uses LTBiCMOS process technology optimized for thermal stability in industrial environments, and the 24-pin PDIP package provides adequate thermal dissipation for 75mW operation without heatsinking.

Does the LTC1276BCN#PBF require an external clock?

No, the LTC1276BCN#PBF does not require an external clock. It features an internally trimmed, synchronized clock that automatically aligns with each conversion command (RD pulse), eliminating asynchronous clock noise and simplifying system timing. This internal clock ensures a maximum conversion time of 2.7µs at 300ksps, and no external oscillator, crystal, or clock buffer is needed - reducing bill-of-materials and PCB area versus competing ADCs.

How is the analog input range configured for the LTC1276BCN#PBF?

The LTC1276BCN#PBF has a fixed ±5V analog input range determined by its supply configuration: it must be operated from ±4.95V to ±5.25V supplies (VDD = +5V, VSS = –5V). Unlike the LTC1273 (0V–5V) or LTC1275 (±2.5V), the LTC1276BCN#PBF's input range is not software-selectable or resistor-programmable - it is hardwired by internal DAC scaling and reference routing. Applying AIN outside ±5V risks code loss or saturation.

What decoupling is required for the VREF pin of the LTC1276BCN#PBF?

The VREF pin (Pin 2) of the LTC1276BCN#PBF requires a 10µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor connected to AGND. This dual-capacitor network suppresses both low-frequency drift and high-frequency noise on the 2.42V reference, ensuring stable DAC operation and minimizing code transition noise. The 10µF tantalum handles bulk energy storage while the 0.1µF ceramic shunts RF noise above 1MHz - a configuration explicitly validated in the LTC1276BCN#PBF datasheet for optimal S/(N+D) performance.

Can the LTC1276BCN#PBF interface directly with an 8-bit microcontroller?

Yes, the LTC1276BCN#PBF supports direct interfacing with 8-bit microcontrollers via its HBEN-controlled two-byte read mode. When HBEN is LOW, all 12 bits appear on D11–D4 and D3/11–D0/8 simultaneously. When HBEN is HIGH, D3/11–D0/8 output DB11–DB8 (high byte), allowing sequential reading of high and low bytes using standard 8-bit data bus timing - compatible with MCS-51, PIC16, and AVR architectures without glue logic.