Texas Instruments TLV1543IDBR

Overview

TLV1543IDBR from Texas Instruments is a 10-bit, 11-channel serial-output analog-to-digital converter (ADC) 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 diagnostics in industrial sensor interfaces and embedded data acquisition systems.

For engineers reviewing the TLV1543IDBR datasheet, TLV1543IDBR pinout, TLV1543IDBR application, or TLV1543IDBR equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across −40°C to 85°C, and two rigorously cross-referenced alternative parts for industrial-grade 10-bit serial ADC replacement scenarios.

Technical Context

The TLV1543IDBR implements a switched-capacitor successive-approximation architecture with an integrated 14-channel analog multiplexer (11 external inputs + 3 internal self-test voltages). Its 4-wire serial interface uses CS, I/O CLOCK, ADDRESS, and DATA OUT signals to enable direct connection to microcontroller SPI peripherals without external logic.

Conversion timing is governed by internal state control synchronized to the tenth falling edge of I/O CLOCK, triggering EOC assertion and initiating data shift-out. The device features differential high-impedance reference inputs (REF+/REF−), ratiometric conversion capability, and automatic sample-and-hold with 6-clock sampling duration followed by hold-on-tenth-edge behavior.

Key Specifications

Pinout & Package

TLV1543IDBR is housed in a 20-pin Small Outline (SOIC) package (DB suffix), 7.5 mm × 12.8 mm body, 1.27 mm pitch, with gull-wing leads and moisture sensitivity level 1.

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, the TLV1543IDBR uniquely combines industrial temperature rating, integrated system clock, hardware EOC signaling, and three self-test modes-making it the only option among the three that supports autonomous diagnostics and deterministic timing in harsh environments.

Availability

TLV1543IDBR is available at Aetrix Electronics and suitable for industrial sensor interfaces, embedded data loggers, motor control feedback systems, and power supply monitoring applications requiring stable component supply across extended temperature ranges.

Supply support for TLV1543IDBR 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 company specializing in analog and embedded processing technologies, with leadership in data converters, power management, and industrial interface solutions.

The TLV1543IDBR belongs to TI's legacy precision data converter family designed specifically for cost-sensitive, medium-speed industrial data acquisition where integration, reliability, and ease of microcontroller interfacing are prioritized over ultra-high resolution or sampling rate.

FAQ

What is the maximum recommended I/O CLOCK frequency for TLV1543IDBR?

The TLV1543IDBR supports up to 1.1 MHz I/O CLOCK frequency across its rated industrial temperature range (−40°C to +85°C). This limit ensures reliable address capture, sampling, and data shift-out timing per the device's internal state machine. Exceeding 1.1 MHz may cause timing violations in slow-mode operation or loss of synchronization during 11–16 clock transfers. The TLV1543IDBR datasheet specifies this value under Recommended Operating Conditions and confirms it in the Electrical Characteristics table for TLV1543I devices.

Does TLV1543IDBR require an external clock source?

No, the TLV1543IDBR does not require an external clock source because it incorporates an on-chip system clock. The device derives all internal timing-including conversion sequencing and state control-from the I/O CLOCK signal provided by the host processor. This eliminates the need for a separate crystal oscillator or clock generator, simplifying design and reducing bill-of-materials cost. The TLV1543IDBR's functional block diagram and detailed description explicitly confirm the presence and role of the integrated system clock.

How many analog input channels does TLV1543IDBR support, and how are they selected?

The TLV1543IDBR supports 11 analog input channels (A0 through A10), selected via a 4-bit serial address applied to the ADDRESS pin. The address is clocked in MSB-first on the first four rising edges of I/O CLOCK. Table 2 in the TLV1543IDBR datasheet maps binary values 0000–1010 to A0–A10 respectively. The device also includes three internal self-test voltages accessible via addresses 1011, 1100, and 1101, bringing the total multiplexer capacity to 14 selectable inputs.

What is the purpose of the EOC pin on TLV1543IDBR, and how is it used?

The EOC (End-of-Conversion) pin on TLV1543IDBR is an active-low, open-drain output that signals when conversion is complete and the 10-bit result is ready for readout. It asserts low on the falling edge of the tenth I/O CLOCK and returns high once the data register is stable. This allows the host processor to poll or interrupt on EOC instead of relying on fixed delays, improving system responsiveness and timing predictability. The TLV1543IDBR datasheet defines EOC timing in Figures 7–8 and specifies td(I/O-EOC) as 70–240 ns.

Is TLV1543IDBR pin-compatible with other Texas Instruments ADCs?

Yes, the TLV1543IDBR is pin-compatible with the TLC1543 series (e.g., TLC1543CDW) in the same SOIC-20 (DB) package. Pin assignments for A0–A10, CS, I/O CLOCK, ADDRESS, DATA OUT, EOC, REF+, REF−, VCC, and GND match exactly. This allows direct replacement in legacy designs without PCB modification. The TLV1543IDBR datasheet explicitly states "Pin Compatible With TLC1543" in its feature list and confirms identical terminal numbering in the DB package top-view diagram.