Texas Instruments TLC1514ID

Overview

TLC1514ID from Texas Instruments is a 10-bit, 4-channel, serial analog-to-digital converter (ADC) operating at 400 kSPS with built-in 4-V reference and 8× FIFO. It features SPI/DSP-compatible serial interface (SCLK up to 20 MHz), differential/nonlinearity error ≤ ±0.5 LSB, and hardware/software/auto power-down modes. Used in industrial data acquisition systems requiring low-power, multi-channel sampling with programmable sweep sequencing.

For engineers reviewing the TLC1514ID datasheet, TLC1514ID pinout, TLC1514ID application, or TLC1514ID equivalent, this page delivers verified technical context, real-world timing behavior, confirmed pin functions for SOIC-16 layout, and validated alternatives for 10-bit SAR ADC migration paths - all grounded in TI's SLAS252 production data sheet.

Technical Context

The TLC1514ID implements a charge redistribution successive approximation register (SAR) architecture with internal sample-and-hold and 4-channel analog multiplexer. Conversion clock derives directly from SCLK (or SCLK/2), enabling tight synchronization with host controllers. Sampling period is programmable (12 or 24 SCLKs) or fully asynchronous via CSTART pin for precise control over acquisition time.

It supports four conversion modes - one-shot, repeat, sweep, and repeat-sweep - with FIFO-triggered interrupt generation and configurable EOC/INT pin function. Internal 4-V reference is selectable via CFR bit D11; external reference operation allows full-scale range tuning between REFM and REFP terminals.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (D package), 3.9 mm × 9.9 mm body, 1.27 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC1514IPW, the TLC1514ID offers identical functionality in a larger SOIC package better suited for prototyping and manual assembly; versus TLC2554ID, it trades 2-bit resolution for lower cost and legacy design continuity in established 10-bit systems.

Availability

TLC1514ID is available at Aetrix Electronics and suitable for industrial sensor monitoring, motor control feedback, portable data loggers, and test & measurement equipment requiring stable component supply and long-term obsolescence management.

Supply support for TLC1514ID 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 power management technologies, with decades of heritage in precision data converters.

The TLC1514ID belongs to TI's legacy SAR ADC family designed for cost-sensitive, low-power industrial DAQ applications where 10-bit resolution, serial interface simplicity, and integrated reference meet core system requirements.

FAQ

What is the maximum sampling rate supported by the TLC1514ID?

The TLC1514ID achieves a maximum throughput of 400 kSPS under specified conditions: SCLK ≤ 20 MHz, long sampling (24 SCLKs), and internal reference enabled. At this rate, each conversion cycle completes in 2.5 µs, including sampling and conversion time. The actual sustained rate depends on host interface timing and FIFO management - for example, FIFO read cycles must occur before overflow to maintain continuous acquisition. The TLC1514ID datasheet confirms this value in Section 1 under "Maximum Throughput".

Does the TLC1514ID require an external reference voltage?

No, the TLC1514ID includes a factory-trimmed 4-V internal reference accessible via REFP and REFM pins. External reference operation is optional and enabled by setting CFR bit D11 = 0. When using the internal reference, 10 µF and 0.1 µF capacitors must be placed between REFP and REFM for stability. The TLC1514ID specification sheet explicitly states "Built-In Reference" as a key feature and provides decoupling guidance in the "Detailed Description" section.

How does the CSTART pin function in the TLC1514ID?

The CSTART pin provides asynchronous control over sampling timing: a falling edge initiates sampling, and a rising edge ends sampling and triggers conversion - independent of SCLK or CS. This enables precise alignment with external events (e.g., PWM edges) and accommodates high-impedance sources needing extended acquisition time. The TLC1514ID datasheet defines CSTART as "This terminal controls the start of sampling… low time controls the duration of the sampling period" and specifies minimum low time as 800 ns.

Can the TLC1514ID operate in pseudo-differential mode?

Yes, the TLC1514ID supports pseudo-differential input mode by setting CFR bit D7 = 1. In this mode, A1 becomes the dedicated MINUS input, leaving A0, A2, and A3 as PLUS inputs - enabling three pseudo-differential channels. The MINUS input tolerates up to 0.2 V ripple, making it suitable for ground-noise rejection in noisy industrial environments. This capability is documented in the "Pseudo-Differential/Single-Ended Input" subsection of the TLC1514ID datasheet.

What are the power-down current specifications for the TLC1514ID?

The TLC1514ID supports three power-down modes: software (via command), hardware (via PWDN pin), and auto (after conversion). With external reference, hardware power-down draws ≤1 µA; with internal reference, it draws ≤5 µA. These values are measured at V_CC = 5 V and TA = 25°C, and are guaranteed in the "Electrical Characteristics" table of the TLC1514ID datasheet (SLAS252, Page 17). Power-down state retains CFR configuration and resumes instantly on CS or CSTART activation.