Texas Instruments TLC0820AIDWR

Overview

TLC0820AIDWR from Texas Instruments is an Advanced LinCMOS™ 8-bit analog-to-digital converter using modified flash architecture, featuring 1.18 µs conversion time, ±1 LSB total unadjusted error, differential reference inputs, and single 5-V supply operation. It serves as a high-speed data acquisition front-end in industrial control systems requiring rapid sampling of analog sensor signals.

For engineers reviewing the TLC0820AIDWR datasheet, TLC0820AIDWR pinout, TLC0820AIDWR application, or TLC0820AIDWR equivalent, this page delivers verified technical context, real-world interface timing behavior, microprocessor-compatible parallel bus operation modes (read-only and write-read), and validated alternative options for legacy system upgrades and obsolescence mitigation.

Technical Context

The TLC0820AIDWR implements a two-stage modified flash architecture: dual 4-bit flash ADCs with an on-chip 4-bit DAC and summing amplifier generate full 8-bit results. Its internal track-and-hold provides a 100-ns sample window and 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 mode (MODE low) initiates conversion on RD falling edge with WR/RDY acting as a ready output; write-read mode (MODE high) starts conversion on WR/RDY falling edge and uses INT to signal completion after ~800 ns delay. Both modes support TTL-compatible 3-state outputs and require no external clock.

Key Specifications

Pinout & Package

Package: SOIC (DW), 20-pin, 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, 2.65 mm max height.

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 TLC0820AIDWR delivers faster conversion (1.18 µs vs. 10 µs), lower power (13 mA vs. 20 mA), and integrated track-and-hold-enabling simpler, more responsive designs without clock generation or external sampling circuitry.

Availability

TLC0820AIDWR is available at Aetrix Electronics and suitable for industrial automation, motor control feedback, and legacy instrumentation systems requiring stable component supply and long-term manufacturability.

Supply support for TLC0820AIDWR 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 precision data converter expertise.

The TLC0820AIDWR belongs to TI's legacy LinCMOS™ ADC family, designed specifically for high-speed, low-power, microprocessor-compatible data acquisition in industrial and instrumentation applications where simplicity and timing predictability are critical.

FAQ

What is the maximum analog input slew rate supported by the TLC0820AIDWR without external sampling components?

The TLC0820AIDWR 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 confirmed in the "Principles of Operation" section of the SLAS064A datasheet and eliminates the need for external sample-and-hold devices in most industrial sensing applications. The TLC0820AIDWR maintains accuracy under these dynamic conditions across its full –40°C to +85°C operating range.

Does the TLC0820AIDWR require an external clock signal to operate?

No, the TLC0820AIDWR does not require an external clock signal. Its modified flash architecture is fully self-timed, with internal logic controlling conversion sequencing and timing. The device relies solely on control signals (CS, RD, WR/RDY, MODE) for synchronization, as explicitly stated in the "Features" list: "No External Clock or Oscillator Components Required." This simplifies system design and reduces component count for the TLC0820AIDWR.

How does the MODE pin affect the interface timing behavior of the TLC0820AIDWR?

The MODE pin selects between two distinct operational modes: MODE low enables read mode (conversion triggered by RD falling edge, WR/RDY acts as ready output); MODE high enables write-read mode (conversion triggered by WR/RDY falling edge, INT signals completion after ~800 ns). These timing differences are documented in Figures 1–4 and the "Operating Characteristics" table of the SLAS064A datasheet. The TLC0820AIDWR's MODE pin thus determines whether the device behaves as a simple read-strobe ADC or a write-initiated converter with interrupt-driven data readiness.

Can the TLC0820AIDWR be used in cascaded configurations to achieve higher resolution?

Yes, the TLC0820AIDWR supports cascading via its OFLW (overflow) output. When the analog input exceeds REF+, OFLW goes low, signaling overflow and enabling connection to a second TLC0820AIDWR to extend resolution to 9 or 10 bits-as illustrated in Figure 6 of the SLAS064A datasheet. This capability is intrinsic to the TLC0820AIDWR's architecture and requires no additional configuration beyond wiring the OFLW pin to the MODE or CS of the secondary device.

What is the total unadjusted error specification for the TLC0820AIDWR over its full operating temperature range?

The TLC0820AIDWR has a total unadjusted error of ±1 LSB over its full operating temperature range of –40°C to +85°C, as specified in the "Operating Characteristics" table (page 2–6) of the SLAS064A datasheet. This value includes offset, full-scale, and linearity errors and guarantees monotonic operation with no missing codes. This specification applies directly to the TLC0820AIDWR and is validated across temperature without calibration.