Texas Instruments TLC0838IPWR

Overview

TLC0838IPWR from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter 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, delivers ±1 LSB total unadjusted error, and achieves 32 µs conversion time at 250 kHz clock frequency - used in industrial sensor signal conditioning and embedded data acquisition systems.

For engineers reviewing the TLC0838IPWR datasheet, TLC0838IPWR pinout, TLC0838IPWR application, or TLC0838IPWR equivalent, key selection considerations include its TSSOP-20 package, –40°C to +85°C temperature rating, SE/COM pin-enabled pseudodifferential mode, MSB-first or LSB-first serial output format, and compatibility with TTL/MOS logic levels for microprocessor interfacing.

Technical Context

The TLC0838IPWR implements a sample-data comparator architecture with internal resistive ladder and SAR logic. Its multiplexer-addressing sequence accepts a 4-bit command via DI to select one of eight channels and configure input polarity (SGL/DIF, ODD/EVEN), while the SE pin controls LSB-first output timing and enables pseudodifferential operation using the COM terminal as common-mode reference.

Conversion begins on CS low assertion and proceeds over exactly eight clock cycles after multiplexer settling; SARS goes high during conversion and DO outputs MSB-first data by default (SE = high) or LSB-first when SE is pulsed low. The device requires no external Zener regulator and draws only 0.6–1.25 mA supply current at 5 V.

Key Specifications

Pinout & Package

TLC0838IPWR uses 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 in Quadrant Q1 per tape-and-reel orientation standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADC0838CCN and TLC0838CPWR, the TLC0838IPWR offers optimal balance of industrial temperature range, low power consumption, and elimination of internal regulator overhead - making it preferred for ruggedized embedded systems requiring long-term reliability without external reference components.

Availability

TLC0838IPWR is available at Aetrix Electronics and suitable for industrial sensor interface, embedded data acquisition, automotive body control, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC0838IPWR 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 90 years of innovation in precision data conversion and industrial-grade IC design.

The TLC0838IPWR belongs to TI's legacy precision ADC product line designed specifically for cost-sensitive, low-power, multi-channel analog digitization in industrial and automotive applications - emphasizing ease of microprocessor integration and robustness across wide temperature ranges.

FAQ

What is the maximum clock frequency supported by the TLC0838IPWR?

The TLC0838IPWR supports clock frequencies from 10 kHz to 600 kHz per datasheet Section 7. Operating outside the recommended 40%–60% duty cycle range requires minimum high/low pulse widths of 1 µs. At 600 kHz, conversion time remains fixed at eight clock periods, enabling sub-14 µs total latency - critical for high-speed polling in motor control feedback loops. The TLC0838IPWR maintains ±1 LSB accuracy across this full range.

How does the SE pin affect data output format on the TLC0838IPWR?

The SE pin on the TLC0838IPWR controls serial output order: when held high, DO outputs MSB-first data; when pulsed low before conversion completion, it enables LSB-first output. This dual-mode capability allows direct compatibility with both legacy 8051-family microcontrollers (MSB-first) and newer ARM Cortex-M peripherals (LSB-first). The TLC0838IPWR requires no additional control logic - SE state is sampled during the conversion cycle and latched internally.

Can the TLC0838IPWR operate without an external voltage reference?

Yes, the TLC0838IPWR supports ratiometric operation by connecting the REF pin directly to VCC, using the 5-V supply as the reference. This eliminates the need for a precision external reference IC and reduces system cost and board space. The TLC0838IPWR maintains ±1 LSB total unadjusted error under this configuration, provided VCC remains within 4.5–5.5 V and exhibits low noise - verified per datasheet Section 8 electrical characteristics.

What is the function of the COM pin on the TLC0838IPWR?

The COM pin on the TLC0838IPWR serves as the common-mode reference for pseudodifferential input mode. When enabled, all eight channels (CH0–CH7) use COM as their shared negative input, allowing measurement of signals referenced to an arbitrary bias voltage - such as sensor bridges biased above ground. This feature is absent in the 4-channel TLC0834 and is a defining capability of the TLC0838IPWR for isolated analog front-ends.

Is the TLC0838IPWR pin-compatible with other packages in the same family?

The TLC0838IPWR (TSSOP-20) shares identical pin functions and ordering with TLC0838IDW (SOIC-20) and TLC0838IN (PDIP-20), as confirmed by the "TLC0838 . . . PW, DW, OR N PACKAGE" diagram in the datasheet. All three packages route CH0–CH7, COM, REF, VCC, GNDs, and serial signals to matching positions. However, PCB layout must account for different thermal and mechanical footprints - the TLC0838IPWR requires 0.65 mm pitch land pattern per JEDEC MO-153.