Texas Instruments TLC0820ACDBR

Overview

TLC0820ACDBR from Texas Instruments is an Advanced LinCMOS™ 8-bit analog-to-digital converter using modified flash architecture, delivering 1.18 µs conversion time, ±1 LSB total unadjusted error, and differential reference inputs. It operates from a single 5-V supply, integrates on-chip track-and-hold with 100-ns sample window, and supports parallel microprocessor interface for real-time data acquisition in industrial control systems.

For engineers reviewing the TLC0820ACDBR datasheet, TLC0820ACDBR pinout, TLC0820ACDBR application, or TLC0820ACDBR equivalent, key selection criteria include its read/write-mode flexibility, TTL-compatible 3-state outputs, 2.5 µs max access time in read mode, overflow flag for cascading, and SSOP-20 package compatibility with high-density PCB layouts.

Technical Context

The TLC0820ACDBR implements a two-stage modified flash architecture: dual 4-bit flash ADCs (MSBs and LSBs) combined with a 4-bit DAC and summing amplifier to achieve full 8-bit resolution without external clocking. Its internal timing logic supports two distinct operational modes-read-only (MODE low) and write-read (MODE high)-each with dedicated control paths for RD, WR/RDY, and INT signals.

Conversion is initiated either by falling edge of RD (read mode) or WR/RDY (write-read mode), with completion signaled via INT assertion and data latching. The device uses differential reference inputs (REF+, REF–) defining the full-scale range, enabling ratiometric measurement, and features an OFLW output for overflow detection and multi-device resolution extension.

Key Specifications

Pinout & Package

Package: SSOP-20 (DB), 7.4 mm × 5.6 mm body, 0.65 mm lead pitch, 2.0 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 TLC0820ACDBR provides faster conversion (1.18 µs vs. ≥3.5 µs), eliminates external clock dependency, integrates track-and-hold, and offers modern SSOP-20 packaging with MSL-1 reflow compatibility-making it optimal for compact, high-throughput embedded systems.

Availability

TLC0820ACDBR is available at Aetrix Electronics and suitable for industrial data acquisition, motor control feedback, and test equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant SSOP packaging.

Supply support for TLC0820ACDBR 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 over 50 years of innovation in precision data converters.

The TLC0820ACDBR belongs to TI's legacy LinCMOS™ precision ADC product line, designed specifically for high-speed, low-power, microprocessor-centric analog digitization in industrial and instrumentation applications.

FAQ

What is the maximum operating temperature range for the TLC0820ACDBR?

The TLC0820ACDBR is rated for 0°C to 70°C ambient operation, matching the "C" grade specification of the TLC0820AC family. This range is validated per TI's SLAS064A datasheet and confirmed in the Package Option Addendum, where TLC0820ACDBR is explicitly listed under the 0°C to 70°C temperature column. Operation outside this range may cause parametric shift or functional failure.

Does the TLC0820ACDBR require an external clock source?

No, the TLC0820ACDBR does not require an external clock source. Its modified flash architecture uses internal timing logic to complete conversion in 1.18 µs without any external oscillator or clock input. This is explicitly stated in the datasheet headline ("No External Clock or Oscillator Components Required") and verified in the Principles of Operation section, which describes self-timed conversion initiation via RD or WR/RDY edges.

How does the MODE pin affect the interface behavior of the TLC0820ACDBR?

The MODE pin selects between two hardware-defined interface protocols: when MODE is low, the device enters read-only mode where WR/RDY functions as an open-drain ready output; when MODE is high, it enters write-read mode where WR/RDY serves as a write strobe input. This dual-mode capability is documented in the Terminal Functions table and Operating Characteristics, enabling direct compatibility with diverse microprocessor buses without external logic.

Can the TLC0820ACDBR be used in cascaded configurations for higher resolution?

Yes, the TLC0820ACDBR supports cascading via its OFLW (overflow) output. When the analog input exceeds REF+, OFLW asserts low, signaling that a second TLC0820ACDBR can be triggered to resolve the residual voltage-enabling 9-bit or 10-bit effective resolution. This functionality is detailed in the Terminal Functions description and illustrated in Figure 6 of the datasheet, confirming hardware-level support without firmware modification.

What is the recommended decoupling for the TLC0820ACDBR VCC and GND pins?

TI recommends placing a 0.1 µF ceramic capacitor between VCC and GND, located as close as possible to pins 20 and 10 respectively. This is shown in Figure 6 (Application Information) and reinforced in the Absolute Maximum Ratings note regarding noise sensitivity. The 45 pF analog input capacitance and 5 pF digital output capacitance further emphasize the need for localized high-frequency decoupling to maintain ±1 LSB accuracy and prevent digital switching noise from coupling into the analog path.