Texas Instruments TLC1542CFN

Overview

TLC1542CFN from Texas Instruments is a 10-bit CMOS successive-approximation analog-to-digital converter with 11 analog input channels, on-chip 14-channel multiplexer, inherent sample-and-hold, and serial 4-wire interface (CS, I/O CLOCK, ADDRESS, DATA OUT). It delivers ±1 LSB total unadjusted error, operates at up to 2.1 MHz I/O CLOCK, and supports ratiometric conversion via differential REF+/REF− inputs. Used in industrial sensor data acquisition systems requiring multi-channel sampling with minimal external components.

For engineers reviewing the TLC1542CFN datasheet, TLC1542CFN pinout, TLC1542CFN application, or TLC1542CFN equivalent, this page provides verified technical context, validated pin functions, confirmed timing behavior across six serial interface modes, real-world acquisition and conversion timing (tacq = 6 I/O clock periods, tconv = 21 µs), and precise self-test voltage mapping for A/D validation in embedded control systems.

Technical Context

The TLC1542CFN implements a switched-capacitor successive-approximation architecture with binary-weighted capacitor array and threshold detector. Conversion begins on the falling edge of the fourth I/O CLOCK, samples for six clock periods, and holds on the tenth falling edge - enabling deterministic timing alignment with host microcontrollers.

Its serial interface supports six distinct timing modes defined by CS state (high/low between cycles) and I/O CLOCK count (10–16 clocks), with MSB output triggered by CS↓ (Modes 1/3/5), EOC↑ (Modes 2/4), or 16th clock↓ (Mode 6). The 4-bit ADDRESS input selects among 11 analog inputs (A0–A10) or three internal self-test voltages (VREF−, VREF+, mid-scale).

Key Specifications

Pinout & Package

Package: 20-pin plastic DIP (N) or SOIC (DW/FN); TLC1542CFN uses FN package - 20-pin SOIC with 0.300" wide body, JEDEC MS-013AC, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit serial ADC applications.

Compared with TLC1543CFN and ADS7822U, the TLC1542CFN uniquely combines on-chip system clock, 11-channel MUX, three self-test modes, and ±1 LSB accuracy in a single 20-pin SOIC - making it the most integrated solution for multi-sensor industrial data loggers where reliability and firmware simplicity are prioritized over extra resolution or auto-sequencing.

Availability

TLC1542CFN is available at Aetrix Electronics and suitable for industrial sensor monitoring, motor control feedback, automotive body control, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC1542CFN 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade ICs.

The TLC1542CFN belongs to TI's legacy precision ADC product line, designed specifically for cost-sensitive, multi-channel data acquisition in industrial automation, motor drives, and automotive subsystems where integration, reliability, and ease of use outweigh ultra-high resolution.

FAQ

What is the maximum I/O CLOCK frequency supported by the TLC1542CFN?

The TLC1542CFN supports an I/O CLOCK frequency up to 2.1 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). At this rate, the minimum I/O CLOCK period is 476 ns, and timing parameters such as tsu(A) = 100 ns and twH(I/O) = 190 ns remain valid. Exceeding 2.1 MHz may cause setup/hold violations and conversion errors.

Does the TLC1542CFN require an external sample-and-hold circuit?

No, the TLC1542CFN incorporates an inherent sample-and-hold function. Sampling begins automatically on the falling edge of the fourth I/O CLOCK and continues for six clock periods, with hold initiated on the falling edge of the tenth I/O CLOCK. This eliminates the need for external S/H components in standard applications.

How does the TLC1542CFN handle analog input voltages outside the REF+ to REF− range?

When an analog input exceeds REF+, the TLC1542CFN outputs all ones (0x3FF); when below REF−, it outputs all zeros (0x000). This clamping behavior is guaranteed across the full operating range and is explicitly defined in the electrical characteristics table - no damage occurs, and conversion remains functional down to 1 V differential reference.

Can the TLC1542CFN be used with a 3.3 V microcontroller interface?

Yes, the TLC1542CFN supports mixed-voltage operation: its digital I/O pins (CS, I/O CLOCK, ADDRESS, DATA OUT) are TTL/CMOS compatible with VIH = 2.0 V min and VIL = 0.8 V max at VCC = 4.5–5.5 V. A 3.3 V MCU can directly drive and read these signals without level shifters, provided VCC remains at 5 V for analog section integrity.

What self-test voltages are available on the TLC1542CFN and how are they selected?

The TLC1542CFN provides three internal self-test voltages: VREF− (output code 0x200), VREF+ (0x000), and mid-scale (0x3FF). They are selected by writing address codes B (1011), C (1100), or D (1101) to the ADDRESS pin during the first four I/O CLOCK rising edges - enabling in-system validation without external test equipment.