Texas Instruments TLC1542CDWG4

Overview

TLC1542CDWG4 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 signal conditioning and embedded data acquisition systems.

For engineers reviewing the TLC1542CDWG4 datasheet, TLC1542CDWG4 pinout, TLC1542CDWG4 application, or TLC1542CDWG4 equivalent, key selection considerations include its 10-bit resolution with guaranteed monotonicity, 21 µs conversion time, EOC-driven timing control, and compatibility with microcontroller SPI-like serial interfaces without external clock source dependency.

Technical Context

The TLC1542CDWG4 implements a switched-capacitor SAR architecture with internal system clock generation, eliminating need for external timing components. Its 4-bit address register selects among 11 analog inputs (A0–A10) or three self-test voltages, with sampling initiated on the fourth I/O CLOCK falling edge and held after the tenth.

It features break-before-make analog multiplexing to minimize channel crosstalk, differential high-impedance reference inputs enabling ratiometric measurement, and three-state DATA OUT synchronized to I/O CLOCK edges - supporting six configurable serial timing modes (fast/slow, CS toggled/continuous, 10–16 clock transfers).

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC1543CDW, TLC1542CDWG4 offers optimized channel count for compact sensor arrays; versus ADS7822U, it trades resolution and speed for integrated reference handling, lower power, and simpler system integration - making it ideal for cost-sensitive, space-constrained 10-bit applications.

Availability

TLC1542CDWG4 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLC1542CDWG4 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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade ICs.

The TLC1542 family was designed for cost-effective, low-pin-count serial ADC applications in resource-constrained embedded systems - emphasizing ease of interface, built-in diagnostics, and robust performance across commercial temperature ranges.

FAQ

What is the maximum I/O CLOCK frequency supported by the TLC1542CDWG4?

The TLC1542CDWG4 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 margins remain valid for all six serial interface modes. Exceeding 2.1 MHz may violate setup/hold times and cause data corruption or missed conversions in the TLC1542CDWG4.

Does the TLC1542CDWG4 require an external clock source for conversion?

No, the TLC1542CDWG4 does not require an external clock source for conversion. It incorporates an on-chip system clock that drives the successive-approximation process internally. The I/O CLOCK signal serves only for serial interface timing - controlling address latching, sampling initiation, and data output shifting - while the actual ADC conversion timing is fully autonomous once triggered by the 10th I/O CLOCK falling edge in the TLC1542CDWG4.

How many analog input channels does the TLC1542CDWG4 support, and how are they selected?

The TLC1542CDWG4 supports 11 analog input channels (A0 through A10), selected via a 4-bit serial address presented to the ADDRESS pin. The address is clocked in MSB-first on the first four rising edges of I/O CLOCK. Valid binary addresses 0000 to 1010 (hex 0 to A) correspond directly to A0–A10; addresses 1011 (B), 1100 (C), and 1101 (D) activate internal self-test modes - all confirmed in the TLC1542CDWG4 functional description.

What is the purpose of the EOC pin on the TLC1542CDWG4, and how is it timed?

The EOC (End-of-Conversion) pin on the TLC1542CDWG4 is an open-drain output that transitions low on the falling edge of the 10th I/O CLOCK pulse and returns high 21 µs later, signaling completion of the A/D conversion cycle. This provides precise hardware synchronization for host processors - enabling interrupt-driven data reads without polling - and is critical for deterministic timing in closed-loop control systems using the TLC1542CDWG4.

Can the TLC1542CDWG4 operate with a reference voltage less than VCC?

Yes, the TLC1542CDWG4 can operate with a reference voltage less than VCC. The differential reference voltage (REF+ − REF−) must be between 2.5 V and VCC, per specifications, but REF+ may be set below VCC (e.g., 3.3 V on a 5 V system) to scale input range and improve resolution for low-voltage signals. Operation remains fully specified down to 2.5 V differential, and the TLC1542CDWG4 maintains ±1 LSB total unadjusted error across that range.