Texas Instruments TLC0838CDWRG4

Overview

TLC0838CDWRG4 from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter (ADC) with integrated 8-channel analog multiplexer and serial I/O 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-pin-count ADC interfacing.

For engineers reviewing the TLC0838CDWRG4 datasheet, TLC0838CDWRG4 pinout, TLC0838CDWRG4 application, or TLC0838CDWRG4 equivalent, key selection considerations include its 20-pin SOIC (DW) package, software-configurable single-ended/differential/pseudodifferential input modes, 0–5 V input range compatibility, and TTL/MOS-level serial interface timing requirements.

Technical Context

The TLC0838CDWRG4 implements a sample-data-comparator architecture with internal resistive ladder and SAR logic. Its multiplexer-addressing sequence accepts a 3- to 4-bit assignment word via DI to select one of eight channels and configure input polarity (SGL/DIF/ODD/EVEN), enabling flexible analog front-end routing without external switches.

Conversion initiation requires CS low followed by clocked start-bit and address bits; SARS goes high during conversion, and DO outputs MSB-first data after one-clock settling delay. The SE pin controls LSB-first output mode, and DI/DO can share a bidirectional microprocessor I/O line due to non-overlapping active windows.

Key Specifications

Pinout & Package

Package: SOIC (DW), 20-pin, wide-body surface-mount (7.5 mm × 12.8 mm). Pinout validated per TI SLAS094E datasheet Figure 3 (TLC0838 PW/DW/N top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADC0838CCN, TLC0838CDWRG4 offers lower quiescent current and eliminates Zener-related thermal drift; compared with TLC0838CPWR, it provides identical functionality in a wider SOIC package that eases hand-soldering and improves thermal dissipation in high-density assemblies.

Availability

TLC0838CDWRG4 is available at Aetrix Electronics and suitable for industrial sensor monitoring, portable test equipment, automotive climate control, and energy meter front-end applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TLC0838CDWRG4 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal processing technologies.

The TLC0838 product line was designed for cost-sensitive, microprocessor-based data acquisition systems needing flexible analog input configuration, minimal external components, and straightforward serial interface integration.

FAQ

What is the maximum clock frequency supported by the TLC0838CDWRG4?

The TLC0838CDWRG4 supports a clock frequency range of 10 kHz to 600 kHz, with a recommended duty cycle of 40–60%. At the maximum 600 kHz clock, conversion time remains fixed at eight clock periods (13.3 µs), though total cycle time includes multiplexer settling and serial data transfer overhead. The TLC0838CDWRG4 datasheet specifies timing parameters such as t_su (350 ns) and t_h (90 ns) to ensure reliable operation at high frequencies.

Does the TLC0838CDWRG4 require an external reference voltage?

No, the TLC0838CDWRG4 supports both ratiometric operation (using VCC as reference) and external reference mode (via REF pin). When operated ratiometrically, the full-scale code corresponds to VCC, making it insensitive to supply variations. For higher precision, a stable 5-V external reference can be applied to REF - the device's input resistance to REF is 1.3–5.9 kΩ, and it tolerates reference voltages from 0 to VCC + 0.05 V.

How does the TLC0838CDWRG4 handle differential input configurations?

The TLC0838CDWRG4 supports true differential inputs using adjacent channel pairs (e.g., CH0/CH1, CH2/CH3) with programmable polarity (ODD/EVEN, SGL/DIF bits). In differential mode, the converter subtracts the negative-input voltage from the positive-input voltage before digitization. It also supports pseudodifferential mode using the COM pin as a common negative reference for all channels - useful when sensors share a non-ground bias potential.

What is the meaning of the "G4" suffix in TLC0838CDWRG4?

The "G4" suffix in TLC0838CDWRG4 denotes Texas Instruments' green packaging standard: lead-free (Pb-free), RoHS-compliant, and halogen-free construction. It indicates NiPdAu (nickel-palladium-gold) lead finish, MSL Level-1 rating (unlimited floor life at <30°C/60% RH), and conformance to JEDEC J-STD-020 moisture sensitivity requirements. This suffix replaces older "G3" or non-G variants in TI's current production.

Can the TLC0838CDWRG4 operate with a 3.3-V microcontroller interface?

Yes, the TLC0838CDWRG4's digital inputs (CS, CLK, DI, SE) accept TTL- and MOS-compatible logic levels: VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 5 V, making them compatible with 3.3-V MCU GPIOs. However, VCC must remain at 4.5–5.5 V to maintain analog performance and 0–5 V input range. Level-shifting is not required for control signals, but analog inputs must stay within –0.3 V to VCC + 0.3 V to avoid damage or erroneous readings.