Texas Instruments TLC0838IPW

Overview

TLC0838IPW from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter (ADC) with integrated 8-channel multiplexer and serial interface. It operates with a single 5-V supply, supports ratiometric or external 5-V reference operation, delivers ±1 LSB total unadjusted error, and achieves 32 µs conversion time at 250 kHz clock-used in industrial sensor data acquisition systems requiring compact, low-power digitization near analog sources.

For engineers reviewing the TLC0838IPW datasheet, TLC0838IPW pinout, TLC0838IPW application, or TLC0838IPW equivalent, key selection considerations include its –40°C to +85°C industrial temperature range, TSSOP-20 package compatibility with high-density PCB layouts, software-configurable single-ended/differential/pseudodifferential input modes, and TTL/MOS-compatible serial I/O for microcontroller interfacing without level-shifting.

Technical Context

The TLC0838IPW implements a sample-data-comparator architecture with an internal resistive ladder and SAR logic. Its 8-channel analog multiplexer is controlled via a 3–4-bit serial address word shifted in on DI, with CS enabling logic and CLK synchronizing both configuration and conversion timing.

Conversion begins after the start bit reaches the internal register; SARS goes high during conversion, and DO outputs MSB-first data over eight clock cycles. The COM pin enables pseudodifferential mode by serving as a common negative reference for all channels, supporting bias-shifted sensor interfaces.

Key Specifications

Pinout & Package

TLC0838IPW is housed in a 20-pin TSSOP (PW) package with 0.65 mm lead pitch, optimized for automated assembly and space-constrained industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADC0838CCN and TLC0838CPW, the TLC0838IPW uniquely combines industrial temperature qualification, TSSOP packaging for high-density layouts, and full functional equivalence to the ADC0838 family-making it optimal for ruggedized embedded systems requiring long-term reliability without design iteration.

Availability

TLC0838IPW is available at Aetrix Electronics and suitable for industrial sensor monitoring, motor control feedback, portable data loggers, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC0838IPW 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 TLC0838IPW belongs to TI's legacy 8-bit serial ADC product line designed for cost-effective, microcontroller-friendly analog digitization in industrial and instrumentation applications where simplicity, reliability, and proven performance outweigh ultra-high resolution.

FAQ

What is the maximum clock frequency supported by the TLC0838IPW?

The TLC0838IPW supports clock frequencies from 10 kHz to 600 kHz per its recommended operating conditions. At 600 kHz, conversion time reduces to approximately 13.3 µs (8 clock periods), though timing margins for setup/hold and propagation delay must be verified per application layout. The TLC0838IPW datasheet specifies minimum pulse duration and duty cycle constraints to ensure reliable operation across this range.

Does the TLC0838IPW require an external reference voltage?

No-the TLC0838IPW operates ratiometrically using VCC as the reference when REF is tied to VCC, or accepts an external 5-V reference for improved accuracy. Its input resistance to REF (1.3–5.9 kΩ) means the reference source must drive this load; dedicated low-output-impedance references or buffered supplies are recommended for high-precision applications.

How does the COM pin function in pseudodifferential mode on the TLC0838IPW?

In pseudodifferential mode, the COM pin serves as a common negative reference for all CH0–CH7 inputs. Each channel is then treated as the positive input relative to COM, enabling digitization of signals biased above ground-such as 2.5 V-referenced op-amp outputs-without requiring dual supplies or level-shifting circuitry external to the TLC0838IPW.

Can DI and DO be connected to the same microcontroller GPIO pin for bidirectional communication with the TLC0838IPW?

Yes-DI is sampled only during the multiplexer-addressing interval (first 4–5 clocks after CS low), while DO is tri-stated until conversion begins. This allows sharing a single bidirectional I/O line, reducing MCU pin count. Firmware must manage direction control and timing carefully to avoid bus contention during the brief window when DO becomes active.

What is the meaning of "Total Unadjusted Error = ±1 LSB" for the TLC0838IPW?

This specification means the combined effect of offset, full-scale, linearity, and multiplexer errors never exceeds ±1 least-significant bit across the full 0–5 V input range and –40°C to +85°C temperature range. It guarantees monotonicity and ensures no missing codes, critical for control loop stability and measurement repeatability in the TLC0838IPW's target applications.