Texas Instruments TLC0838CPWR

Overview

TLC0838CPWR from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter (ADC) with integrated 8-channel analog multiplexer, serial control interface, and ratiometric operation capability. It supports single-ended, differential, and pseudodifferential input configurations, operates from a single 5-V supply with 0–5-V input range, and delivers ±1 LSB total unadjusted error at 250 kHz clock frequency - ideal for embedded sensor data acquisition in industrial monitoring systems.

For engineers reviewing the TLC0838CPWR datasheet, TLC0838CPWR pinout, TLC0838CPWR application, or TLC0838CPWR equivalent, key selection considerations include its TSSOP-20 package, software-configurable channel addressing, MSB/LSB-first serial output mode controlled by SE pin, 32 µs conversion time, and compatibility with TTL/MOS logic levels in microprocessor-interfaced or remote-sensing designs.

Technical Context

The TLC0838CPWR implements a sample-data-comparator architecture with internal resistive ladder and SAR logic to perform successive-approximation conversions. Its multiplexer-address shift register accepts a 4-bit assignment word via DI after a start bit, enabling dynamic channel selection and input polarity assignment before conversion initiation.

Conversion begins when the start bit reaches the SARS latch; the SAR status output goes high, DO exits high-impedance, and 8-bit data streams out MSB-first (or LSB-first if SE is asserted low). A built-in one-clock-cycle multiplexer settling delay ensures signal integrity prior to sampling.

Key Specifications

Pinout & Package

TLC0838CPWR is housed in a 20-pin TSSOP (PW) package with 0.65 mm pitch, 6.5 mm × 4.4 mm body size, and exposed pad not connected internally. Pin 1 is located at top-left corner with quadrants aligned per JEDEC standard Q1 orientation in tape-and-reel packaging.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADC0838CCN and MCP3008-I/P, the TLC0838CPWR offers unique pseudodifferential COM input support and SE-controllable LSB-first output - critical for legacy microcontroller firmware and sensor biasing architectures not served by either alternative.

Availability

TLC0838CPWR is available at Aetrix Electronics and suitable for industrial monitoring systems, PLC analog input modules, automotive cabin sensor hubs, and portable data loggers requiring stable component supply and long-term production continuity.

Supply support for TLC0838CPWR 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 heritage.

The TLC0838CPWR belongs to TI's legacy 8-bit serial ADC family designed for cost-effective, microprocessor-friendly analog digitization in resource-constrained embedded systems - emphasizing ease of interface, flexible input configuration, and robust operation across commercial temperature ranges.

FAQ

What is the maximum clock frequency supported by the TLC0838CPWR?

The TLC0838CPWR supports a clock frequency range of 10 kHz to 600 kHz per the recommended operating conditions. At 600 kHz, conversion time remains eight clock periods (13.3 µs), but system-level timing margins for setup/hold and multiplexer settling must be verified. The datasheet specifies 250 kHz as the nominal test condition yielding 32 µs total conversion time including settling.

Does the TLC0838CPWR require an external reference voltage?

No - the TLC0838CPWR operates ratiometrically using the VCC supply as reference, enabling direct 0–5 V input encoding when VCC = 5 V. An external reference can be applied to the REF pin to scale full-scale range (e.g., 2.5 V reference yields 0–2.5 V input range with 8-bit resolution); the device does not require an external reference to function.

How does the SE pin affect data output timing on the TLC0838CPWR?

When SE is held high, the TLC0838CPWR outputs conversion results MSB-first. When SE is driven low before conversion completes, the 9-bit shift register reconfigures to output LSB-first. This behavior is confirmed in Figures 5 and 6 of the SLAS094E datasheet and enables firmware compatibility with processors expecting little-endian serial data streams.

Can the TLC0838CPWR perform true differential measurements between non-adjacent channels?

No - differential mode on the TLC0838CPWR is restricted to adjacent channel pairs (e.g., CH0/CH1, CH2/CH3) as defined in the MUX-address control logic table. Non-adjacent channels cannot be paired differentially; however, the COM pin enables pseudodifferential operation where all channels share a common negative reference, supporting arbitrary bias voltages.

What is the purpose of the SARS pin on the TLC0838CPWR?

The SARS (Start of Acquisition and Result Status) pin is an open-drain output that goes high when conversion begins and returns low upon completion. It provides hardware handshaking to the host microcontroller, indicating active sampling duration and eliminating need for fixed-delay polling - critical for deterministic real-time systems using the TLC0838CPWR.