Analog Devices Inc. LTC2309IF#TRPBF

Overview

LTC2309IF#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, 8-channel, 12-bit successive approximation register (SAR) analog-to-digital converter with I²C interface, internal 2.5V reference, and integrated 8-channel multiplexer. It operates from a single 5V supply, delivers 14ksps throughput, 73.4dB SNR, and supports software-selectable unipolar/bipolar input ranges - ideal for isolated industrial data acquisition systems requiring precision and low power.

For engineers reviewing the LTC2309IF#TRPBF datasheet, LTC2309IF#TRPBF pinout, LTC2309IF#TRPBF application, or LTC2309IF#TRPBF equivalent, key selection criteria include guaranteed no missing codes, –40°C to 85°C operation in TSSOP package, I²C address configurability via AD0/AD1 pins, and internal REFCOMP buffer output at 4.096V for high-accuracy unipolar measurements.

Technical Context

The LTC2309IF#TRPBF implements a fully differential sample-and-hold circuit paired with a 12-bit capacitive DAC for charge redistribution, enabling precise rejection of common-mode noise during acquisition. Its internal conversion clock eliminates external timing components and achieves 1.3µs conversion time independent of system clock jitter.

It uses a 6-bit DIN word to configure channel selection (S1/S0), input mode (single-ended/differential via S/D bit), polarity (unipolar/bipolar via UNI bit), and sleep control (SLP bit). The I²C interface operates at up to 400kHz, with open-drain SDA and Schmitt-triggered SCL supporting robust communication in electrically noisy environments.

Key Specifications

Pinout & Package

Package: 20-Lead Plastic TSSOP (F package), footprint-compatible with industry-standard 0.65mm pitch SOIC-20 but with improved thermal performance (θ_JA = 90°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7953IRHBT and MAX11617ETE+, the LTC2309IF#TRPBF uniquely combines I²C compatibility, internal 4.096V REFCOMP, bipolar/unipolar software selection, and –40°C to 85°C TSSOP operation - making it optimal for space-constrained, mixed-voltage industrial nodes where reference integration and interface simplicity are critical.

Availability

LTC2309IF#TRPBF is available at Aetrix Electronics and suitable for industrial process control, motor control, and battery-operated instrumentation requiring stable component supply across extended temperature ranges.

Supply support for LTC2309IF#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 LTC2309IF#TRPBF belongs to ADI's precision data acquisition product line, designed specifically for low-power, multichannel, high-accuracy sensing in harsh industrial environments where reliability and ease of integration are paramount.

FAQ

What is the operating temperature range of the LTC2309IF#TRPBF?

The LTC2309IF#TRPBF is rated for operation from –40°C to +85°C, validated across the full range for parameters including INL (±1 LSB), SNR (≥71 dB), and supply current (≤350 µA in nap mode). This makes it suitable for deployment in industrial enclosures and outdoor power monitoring units without thermal derating.

Does the LTC2309IF#TRPBF require an external reference voltage?

No - the LTC2309IF#TRPBF includes a factory-trimmed 2.5V internal bandgap reference, buffered to 4.096V at the REFCOMP pin. This eliminates the need for external references in most unipolar applications. However, VREF can be overdriven with an external 2.5V source for improved accuracy or lower drift if required.

How many I²C addresses does the LTC2309IF#TRPBF support?

The LTC2309IF#TRPBF supports nine unique I²C addresses plus one global address for synchronization, configured via the AD0 and AD1 pins (LOW/HIGH/floating states). This allows up to nine devices on a single I²C bus without address collision, ideal for modular sensor arrays or distributed I/O systems.

Can the LTC2309IF#TRPBF measure both unipolar and bipolar signals?

Yes - the LTC2309IF#TRPBF supports software-selectable input ranges: 0V to 4.096V (unipolar) or ±2.048V (bipolar), controlled by the UNI bit in the 6-bit DIN configuration word. This flexibility enables use with both single-supply sensors (e.g., RTDs) and bipolar transducers (e.g., accelerometers) without hardware changes.

What is the conversion time and throughput rate of the LTC2309IF#TRPBF?

The LTC2309IF#TRPBF has a fixed conversion time of 1.3 µs and achieves a maximum throughput rate of 14 ksps. This is enabled by its internal conversion clock - no external timing components are needed, and performance remains stable across temperature and supply variations.