Texas Instruments TLV1543CDB

Overview

TLV1543CDB from Texas Instruments is a 10-bit, 11-channel serial-output analog-to-digital converter with built-in sample-and-hold, on-chip system clock, and end-of-conversion (EOC) output. It operates from a 3.3-V supply, delivers ±1 LSB total unadjusted error, and supports three self-test modes for validation in embedded data acquisition systems.

For engineers reviewing the TLV1543CDB datasheet, TLV1543CDB pinout, TLV1543CDB application, or TLV1543CDB equivalent, key selection criteria include its 3.3-V CMOS operation, 11 analog input channels with 4-bit address interface, EOC signaling, and compatibility with host microcontroller serial ports via CS/I/O CLOCK/ADDRESS/DATA OUT four-wire protocol.

Technical Context

The TLV1543CDB implements a switched-capacitor successive-approximation ADC architecture with an integrated 14-channel analog multiplexer (11 external inputs + 3 internal self-test voltages). Sampling begins on the fourth I/O CLOCK falling edge and holds after the tenth falling edge, enabling precise timing control across six serial interface modes.

Its differential high-impedance reference inputs (REF+/REF−) support ratiometric conversion and isolation from supply noise, while the 3-state DATA OUT and chip-select–controlled I/O CLOCK/ADDRESS enable direct interfacing to microcontroller SPI peripherals without external logic.

Key Specifications

Pinout & Package

TLV1543CDB is housed in a 20-pin Small Outline (SOIC) package (DB), 7.5 mm × 12.8 mm body, 1.27 mm pitch, with gull-wing leads and exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC1543CDW and ADS7822U, TLV1543CDB uniquely balances 11-channel count, 3.3-V compatibility, ±1 LSB accuracy, and integrated self-test - making it optimal for cost-sensitive, space-constrained industrial and medical data loggers requiring field-verifiable ADC functionality.

Availability

TLV1543CDB is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, medical patient monitor front-ends, and energy meter data acquisition requiring stable component supply and long-term production continuity.

Supply support for TLV1543CDB 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 over 50 years of innovation in precision data converters and industrial ICs.

The TLV1543CDB belongs to TI's TLV1543 family of low-power, serial-output ADCs designed specifically for microcontroller-based data acquisition in cost-sensitive, space-constrained embedded systems operating from 3.3-V supplies.

FAQ

What is the maximum sampling rate achievable with the TLV1543CDB?

The TLV1543CDB has a fixed conversion time of 21 µs, and its minimum total cycle time is 21 µs plus 10 I/O CLOCK periods. At the maximum rated I/O CLOCK frequency of 1.1 MHz (909 ns period), the fastest achievable sustained sampling rate is approximately 40.8 kSPS - limited by the 10-clock serial transfer and internal state machine timing, not by analog bandwidth.

Does the TLV1543CDB require an external clock source?

No, the TLV1543CDB includes an on-chip system clock and requires only the externally supplied I/O CLOCK signal for serial interface timing. The internal clock drives the successive-approximation logic and sample-and-hold control; no crystal, oscillator, or external clock generator is needed for basic operation of TLV1543CDB.

How does the self-test functionality work in the TLV1543CDB?

The TLV1543CDB provides three internal self-test voltages - Vref+, Vref−, and Vref+/2 - selected by writing address values 0xD, 0xC, and 0xB to the ADDRESS pin. When activated, these references are routed through the 14-channel multiplexer and converted identically to external analog inputs, yielding ideal output codes of 0x3FF, 0x000, and 0x200 respectively - enabling firmware-based validation of ADC linearity and reference integrity without external test equipment.

Can the TLV1543CDB interface directly with an SPI port?

Yes, the TLV1543CDB's four-wire serial interface (CS, I/O CLOCK, ADDRESS, DATA OUT) is functionally compatible with standard SPI master peripherals. Though not labeled "SPI", its timing aligns with Mode 0 (CPOL = 0, CPHA = 0) when using 10-clock transfers: CS active low, data sampled on I/O CLOCK falling edges, and MSB first. No additional glue logic is required to connect TLV1543CDB to common microcontrollers.

What is the input capacitance of the analog channels on the TLV1543CDB?

The analog input capacitance (Ci) of the TLV1543CDB is specified as 7 pF minimum and 60 pF maximum per channel (A0–A10) over temperature. This value represents the effective capacitive load seen by the driving source during sampling mode and must be considered when designing anti-aliasing filters or selecting driver op-amps to maintain settling accuracy within the 6-I/O CLOCK acquisition window.