Analog Devices Inc. LTC1288CS8#TRPBF

Overview

LTC1288CS8#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit successive approximation ADC with integrated 2-channel analog multiplexer, serial interface, and on-chip sample-and-hold. It operates from 2.7V to 6V, draws 210µA typical supply current at 6.6ksps sampling rate, auto-shuts down to 1nA between conversions, and is housed in an 8-lead SOIC package. It is used in battery-operated remote data acquisition systems requiring low-power, isolated analog sensing.

For engineers reviewing the LTC1288CS8#TRPBF datasheet, LTC1288CS8#TRPBF pinout, LTC1288CS8#TRPBF application, or LTC1288CS8#TRPBF equivalent, key selection criteria include its 2-channel MUX architecture, SPI/Microwire-compatible 4-wire serial interface, guaranteed ±3/4 LSB DNL, 100µs conversion time, and ability to operate with reduced input spans down to 1.5V full-scale.

Technical Context

The LTC1288CS8#TRPBF implements a switched-capacitor SAR architecture with internal reference tied to VCC/VREF (Pin 8), enabling single-supply operation without external reference. Its software-selectable 2-channel MUX supports both single-ended (CH0/GND, CH1/GND) and differential (CH0–CH1) measurement modes via 3-bit DIN configuration.

It uses a synchronous half-duplex 4-wire serial interface (CS/SHDN, CLK, DIN, DOUT) with start-bit–driven protocol; data is clocked LSB-first or MSB-first depending on the MSBF bit. Conversion timing is governed by tCYC = 141.5µs at 120kHz CLK, with tSMPL = 1.5 clock cycles and tCONV = 12 clock cycles.

Key Specifications

Pinout & Package

Package: 8-lead plastic SOIC (SO-8), 150°C max junction temperature, θJA = 175°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MCP3202-I/P, the LTC1288CS8#TRPBF uniquely combines integrated 2-channel MUX, VCC-referenced operation, sub-µA shutdown, and guaranteed ±3/4 LSB DNL in an 8-pin SOIC - making it optimal for ultra-low-power, space-constrained, ratiometric sensing applications.

Availability

LTC1288CS8#TRPBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated data acquisition requiring stable component supply and long-term production continuity.

Supply support for LTC1288CS8#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 LTC1288CS8#TRPBF belongs to ADI's legacy Linear Technology micropower precision ADC family, designed specifically for energy-constrained applications demanding high resolution, low quiescent current, and minimal external components.

FAQ

What is the maximum sampling rate of the LTC1288CS8#TRPBF?

The LTC1288CS8#TRPBF achieves a maximum sampling rate of 6.6ksps under standard conditions (VCC = 2.7V, fCLK = 120kHz). This rate is determined by its 141.5µs total cycle time and is guaranteed across the 0°C to 70°C operating temperature range. At lower clock frequencies or reduced sample rates, supply current scales linearly - enabling further power savings in duty-cycled systems.

Does the LTC1288CS8#TRPBF require an external voltage reference?

No, the LTC1288CS8#TRPBF does not require an external voltage reference. Its VCC/VREF pin (Pin 8) serves as both power supply and reference input, enabling true ratiometric operation. When powered from a 3V source, the full-scale input range is 0V to 3V; this eliminates the need for precision reference ICs and reduces BOM cost and board area in sensor interface applications.

How does the LTC1288CS8#TRPBF achieve 1nA shutdown current?

The LTC1288CS8#TRPBF achieves 1nA typical shutdown current when CS/SHDN (Pin 1) is driven high to VCC. In this state, internal bias circuits and the comparator are fully gated off, the reference node becomes high-impedance, and only leakage currents remain. Clock and DIN signals have no effect on ICC during shutdown - allowing continuous clocking without power penalty, which simplifies timing-critical isolation barrier designs.

Can the LTC1288CS8#TRPBF perform differential measurements?

Yes, the LTC1288CS8#TRPBF supports differential measurements between CH0 and CH1 when configured via the DIN input word (SGL/DIFF = 0). In differential mode, it measures the voltage difference (CH0 – CH1) with respect to GND, providing rejection of common-mode noise - a key advantage in noisy industrial environments or when digitizing bridge-based sensors like load cells or pressure transducers.

What is the purpose of the start bit in the LTC1288CS8#TRPBF serial protocol?

The start bit in the LTC1288CS8#TRPBF serial protocol is the first logical '1' clocked into DIN after CS falls low. It synchronizes the 3-bit configuration word (SGL/DIFF, ODD/SIGN, MSBF) that follows, initiating the conversion sequence. Leading zeros before the start bit are ignored, ensuring robust communication even with variable timing or noise on the DIN line - a feature critical for reliable operation in electrically noisy embedded systems.