Texas Instruments TLC0820ACDWRG4

Overview

TLC0820ACDWRG4 from Texas Instruments is an Advanced LinCMOS™ 8-bit analog-to-digital converter using modified flash architecture, featuring 1.18 µs conversion time, differential reference inputs, parallel microprocessor interface, on-chip track-and-hold, and single 5-V supply operation - deployed in high-speed data acquisition systems for industrial instrumentation.

For engineers reviewing the TLC0820ACDWRG4 datasheet, TLC0820ACDWRG4 pinout, TLC0820ACDWRG4 application, or TLC0820ACDWRG4 equivalent, this page delivers verified electrical specs, mode-select timing behavior, TTL-compatible 3-state outputs, overflow flag functionality for cascaded resolution extension, and SOIC-20 package–specific layout guidance.

Technical Context

The TLC0820ACDWRG4 implements a two-stage modified flash architecture: dual 4-bit flash ADCs (MSB/LSB), a 4-bit DAC for error correction, summing amplifier, and latch-based output staging. It operates in Read Mode (MODE = low) or Write-Read Mode (MODE = high), with WR/RDY serving as ready output or write input respectively.

Its on-chip track-and-hold provides a 100-ns sample window and supports analog slew rates up to 100 mV/µs without external components. The device uses differential REF+ and REF– inputs to define full-scale range, enabling ratiometric conversion via reference voltage scaling.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, 2.65 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit parallel ADC applications.

Compared with ADC0820CCN and AD7820KN, the TLC0820ACDWRG4 delivers faster conversion (1.18 µs vs. 10 µs), integrated track-and-hold, and hardware overflow signaling - reducing system-level design effort and improving real-time responsiveness in microprocessor-coupled data paths.

Availability

TLC0820ACDWRG4 is available at Aetrix Electronics and suitable for industrial data acquisition, automotive sensor interface, and medical instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant SOIC packaging.

Supply support for TLC0820ACDWRG4 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 TLC0820A series was designed for cost-sensitive, high-speed 8-bit digitization in microprocessor-based systems - emphasizing ease of interface, minimal external components, and robust operation across commercial temperature ranges.

FAQ

What is the maximum analog input slew rate supported by the TLC0820ACDWRG4?

The TLC0820ACDWRG4 supports analog input slew rates up to 100 mV/µs due to its integrated track-and-hold circuit with a 100-ns sample window. This specification is validated across the full 0°C to 70°C operating range and eliminates the need for external sampling components when digitizing fast-changing signals such as motor current waveforms or pulse-width modulated sensor outputs.

Does the TLC0820ACDWRG4 require an external clock or oscillator?

No, the TLC0820ACDWRG4 does not require an external clock or oscillator. Its modified flash architecture uses internal timing generation, enabling autonomous conversion initiation on RD or WR edges. This simplifies system design by removing clock distribution, jitter management, and associated passive components - a key advantage over alternatives like the AD7820KN which mandates external clocking.

How does the OFLW pin function in the TLC0820ACDWRG4, and can it be used for resolution extension?

The OFLW pin on the TLC0820ACDWRG4 asserts low when the analog input exceeds the REF+ voltage, signaling overflow. As documented in TI's SLAS064A datasheet Figure 6, this flag enables cascading two TLC0820ACDWRG4 devices - where the overflow output of the first stage controls the second stage's reference - to achieve 9-bit or 10-bit effective resolution without external logic.

What are the valid logic levels for the MODE pin on the TLC0820ACDWRG4?

The MODE pin on the TLC0820ACDWRG4 is internally pulled down via a 50-µA current source. A logic high (≥3.5 V at VCC = 4.75–5.25 V) selects Write-Read Mode; a logic low (≤1.5 V) selects Read Mode. The pin must be driven actively - floating is not permitted - and its state determines whether WR/RDY functions as a write trigger or ready indicator.

Is the TLC0820ACDWRG4 pin-compatible with the obsolete ADC0820C series?

Yes, the TLC0820ACDWRG4 is a direct functional and pin-compatible replacement for the National Semiconductor ADC0820C/CC, as explicitly stated in the TI datasheet. Pin assignments, timing diagrams, electrical characteristics, and package footprints (SOIC-20) match identically - enabling drop-in substitution in legacy designs without PCB or firmware modification.