Texas Instruments TLC0820AIFN

Overview

TLC0820AIFN from Texas Instruments is an Advanced LinCMOS™ 8-bit analog-to-digital converter using modified flash architecture, featuring differential reference inputs, parallel microprocessor interface, on-chip track-and-hold (100-ns sample window), single 5-V supply operation, and ±1 LSB total unadjusted error over –40°C to 85°C. It enables high-speed data acquisition in industrial control and test instrumentation systems.

For engineers reviewing the TLC0820AIFN datasheet, TLC0820AIFN pinout, TLC0820AIFN application, or TLC0820AIFN equivalent, this page delivers verified technical context, real-world timing behavior (1.18 µs conversion), TTL-compatible 3-state outputs, dual-mode operation (read/write-read), and validated alternatives for legacy system upgrades.

Technical Context

The TLC0820AIFN implements a two-stage modified flash architecture: two independent 4-bit flash ADCs feed a 4-bit DAC and summing amplifier to resolve full 8-bit output with 1.18 µs typical conversion time over temperature. Its internal track-and-hold supports analog input slew rates up to 100 mV/µs without external components.

It operates in two distinct interface modes selected by the MODE pin: read-only mode (MODE low) uses WR/RDY as a ready output and initiates conversion on RD falling edge; write-read mode (MODE high) uses WR/RDY as a write trigger and provides INT assertion after ~800 ns delay, enabling pipelined microprocessor interfacing with minimal external logic.

Key Specifications

Pinout & Package

Package: PLCC-20 (FN), 0.9-inch square body, 1.27 mm lead pitch, JEDEC MS-018 compliant, lead-free (NIPDAU), MSL Level-3 (per TI documentation).

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 TLC0820AIFN delivers faster conversion (1.18 µs vs. 10 µs), eliminates external clock dependency, maintains full pin compatibility with legacy PLCC-20 layouts, and offers active production support with RoHS-compliant packaging-making it the optimal upgrade path for industrial and instrumentation retrofits.

Availability

TLC0820AIFN is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and legacy embedded instrumentation requiring stable component supply, long-lifecycle assurance, and direct replacement capability for obsolete 8-bit ADCs.

Supply support for TLC0820AIFN 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 experience in precision data conversion and industrial-grade IC design.

The TLC0820AIFN belongs to TI's legacy LinCMOS™ precision ADC family, engineered specifically for cost-sensitive, high-reliability industrial and instrumentation applications demanding robust performance across extended temperature ranges without external timing or sampling components.

FAQ

What is the maximum analog input slew rate supported by the TLC0820AIFN without external sampling circuitry?

The TLC0820AIFN integrates an on-chip track-and-hold with a 100-ns sample window, enabling reliable conversion of analog signals with slew rates up to 100 mV/µs. This specification is confirmed in the "Principles of Operation" section of the SLAS064A datasheet and eliminates the need for external sample-and-hold amplifiers in most medium-speed acquisition scenarios. The TLC0820AIFN achieves this while maintaining ±1 LSB total unadjusted error across its full –40°C to 85°C operating range.

Does the TLC0820AIFN require an external clock or oscillator to operate?

No, the TLC0820AIFN does not require an external clock or oscillator. Its modified flash architecture and internal timing control logic generate all necessary sequencing signals autonomously. This is explicitly stated in the device description: "No External Clock or Oscillator Components Required." The TLC0820AIFN relies solely on control signals (CS, RD, WR/RDY, MODE) and power (VCC/GND) to perform conversions, simplifying system design and reducing bill-of-materials count.

What are the key differences between read mode and write-read mode on the TLC0820AIFN?

In read mode (MODE = low), WR/RDY functions as a ready output that goes low when the device is busy and returns high-impedance upon conversion completion; conversion starts on the falling edge of RD. In write-read mode (MODE = high), WR/RDY acts as a write input that initiates conversion on its falling edge, and INT asserts ~800 ns later to indicate result readiness. Both modes support parallel 8-bit data transfer via D0–D7, but timing relationships and control signal roles differ significantly-details are fully specified in Figures 1–4 of the SLAS064A datasheet. The TLC0820AIFN's dual-mode flexibility enables seamless integration with diverse 8-bit microprocessor buses.

Is the TLC0820AIFN pin-compatible with the ADC0820C/CC and AD7820K/B/T?

Yes, the TLC0820AIFN is documented as a direct replacement for National Semiconductor's ADC0820C/CC and Analog Devices' AD7820K/B/T. All three share identical PLCC-20 (FN) package outlines, pin assignments, and functional terminal definitions-including ANLG IN (Pin 1), REF+ (Pin 12), REF– (Pin 11), CS (Pin 13), RD (Pin 8), WR/RDY (Pin 6), MODE (Pin 7), D0–D7 (Pins 2–5, 14–17), INT (Pin 9), OFLW (Pin 18), VCC (Pin 20), and GND (Pin 10). This compatibility is explicitly affirmed in the device description and enables drop-in replacement in legacy designs without PCB or firmware changes. The TLC0820AIFN retains identical timing, voltage levels, and interface behavior.

What is the operating temperature range and total unadjusted error specification for the TLC0820AIFN?

The TLC0820AIFN is rated for operation from –40°C to +85°C (industrial grade), with a total unadjusted error of ±1 LSB across that full range. This specification includes offset, full-scale, and linearity errors and is guaranteed-not typical-per the "Operating Characteristics" table in SLAS064A. The ±1 LSB error ensures monotonic transfer function and absence of missing codes, critical for closed-loop control and precision measurement applications. The TLC0820AIFN achieves this performance using Advanced LinCMOS™ silicon-gate process technology, which provides stable characteristics over temperature without calibration.