Texas Instruments TLC1225IFNR

Overview

TLC1225IFNR from Texas Instruments is a self-calibrating 12-bit-plus-sign parallel-output analog-to-digital converter (ADC) designed for precision data acquisition in microprocessor-based systems. It delivers 12-bit linearity, 12-µs conversion time at 2 MHz clock, true differential inputs with ±5-V or single 5-V supply operation, and 2's-complement output format - enabling high-accuracy bipolar/unipolar measurement in industrial instrumentation and test equipment.

For engineers reviewing the TLC1225IFNR datasheet, TLC1225IFNR pinout, TLC1225IFNR application, or TLC1225IFNR equivalent, key selection criteria include its self-calibration architecture eliminating factory trimming, 13-pin parallel bus interface, –40°C to 85°C operating range, and compatibility with TTL/CMOS microprocessors without external support logic.

Technical Context

The TLC1225IFNR employs successive-approximation architecture with a 13-bit capacitive DAC array and integrated calibration logic that corrects comparator offset and seven most significant capacitor errors in a dedicated 300-cycle nonconversion cycle. Its internal calibration eliminates manual trimming and maintains accuracy across temperature drift.

It supports true differential analog inputs (IN+, IN–) with –Vref to +Vref range, configurable common-mode voltage (0 V to 5 V for unipolar, –5 V to 5 V for bipolar), and direct 16-bit bus interfacing via 13 data lines (D0–D12), control signals (CS, RD, WR, INT, READY OUT), and dual-supply rails (ANLG VCC±, DGTL VCC).

Key Specifications

Pinout & Package

Package: 28-pin plastic chip carrier (FN), lead pitch 1.27 mm, body size 13.1 × 13.1 mm - RoHS-compliant surface-mount package with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-to-digital conversion applications.

Compared with ADS7822U and MAX195BCNG+, the TLC1225IFNR uniquely combines self-calibration, true differential inputs, and parallel bus compatibility in a single 28-pin FN package - making it optimal for legacy industrial controllers needing drop-in ADC upgrades without firmware or PCB changes.

Availability

TLC1225IFNR is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical instrumentation, and avionics sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC1225IFNR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies - with over 50 years of innovation in precision data converters and industrial-grade ICs.

The TLC1225IFNR belongs to TI's legacy LinCMOS precision ADC family, engineered for high-accuracy, low-drift data acquisition in harsh environments where self-calibration and supply flexibility reduce system-level calibration overhead.

FAQ

What is the operating temperature range for the TLC1225IFNR?

The TLC1225IFNR is characterized for operation from –40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in factory automation, motor control, and outdoor instrumentation environments where thermal stability is critical. The device maintains specified linearity, offset, and conversion timing across this full range without derating.

Does the TLC1225IFNR require external calibration components?

No, the TLC1225IFNR does not require external calibration components. Its integrated self-calibration circuitry automatically corrects comparator offset and seven most significant capacitor errors during a 300-clock-cycle nonconversion cycle. This eliminates factory thin-film resistor trimming and field adjustment potentiometers, reducing BOM count and assembly cost.

How does the TLC1225IFNR handle bipolar versus unipolar input configurations?

The TLC1225IFNR supports both modes via supply configuration: with ±5-V analog supplies, grounding IN– enables standard bipolar operation (–5 V to +5 V input range); with single 5-V supply, the same grounding yields unipolar mode (0 V to 5 V). In both cases, D12 serves as the sign bit in 2's-complement output, preserving consistent firmware handling.

What is the minimum clock frequency required for valid conversion on the TLC1225IFNR?

The TLC1225IFNR operates down to 0.3 MHz clock frequency per datasheet specifications. At this rate, conversion time extends to 80 µs (24 cycles), maintaining full 12-bit linearity and self-calibration integrity. Lower frequencies are permissible but reduce throughput - critical for real-time control loops requiring >10 kSPS.

Can the TLC1225IFNR interface directly with a modern microcontroller lacking a parallel bus?

Yes, the TLC1225IFNR can interface with modern microcontrollers via GPIO bit-banging or FPGA glue logic emulating CS/RD/WR handshaking, though native parallel bus support is optimal. Its TTL/CMOS-compatible outputs and READY OUT signal simplify timing synchronization - unlike serial ADCs, no protocol translation or driver software is needed for basic read operations.