Texas Instruments TLV0838CDW

Overview

TLV0838CDW from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter (ADC) with integrated 8-channel multiplexer, serial interface, and ratiometric operation. It operates from 2.7 V to 3.6 V, delivers ±1 LSB total unadjusted error, supports single-ended/differential/pseudodifferential inputs, and achieves 32 µs conversion time at 250 kHz clock - used in industrial sensor signal conditioning and embedded data acquisition systems.

For engineers reviewing the TLV0838CDW datasheet, TLV0838CDW pinout, TLV0838CDW application, or TLV0838CDW equivalent, key selection criteria include its 20-pin SOIC (DW) package, software-configurable input topology, TTL/MOS-compatible serial I/O, 0°C to 70°C temperature grade, and compatibility with microprocessor-based control loops requiring low-voltage, low-power ADC functionality.

Technical Context

The TLV0838CDW implements a sample-data comparator architecture with a successive-approximation register (SAR) core, using an internal resistive ladder and precision comparator for conversion. Its multiplexer is fully software-addressed via a serial 3–4-bit assignment word following a start bit on the DI line.

Channel selection and input mode (single-ended, differential, or pseudodifferential via COM pin) are determined by the serial address sequence; polarity assignment for differential pairs is programmable, and the SE pin controls LSB-first vs. MSB-first output format. Conversion is initiated by CS low and synchronized to external CLK edges.

Key Specifications

Pinout & Package

TLV0838CDW is housed in a 20-pin SOIC (DW) package with 0.300-inch body width and standard JEDEC MO-026AC footprint. Pin spacing is 0.050 inch (1.27 mm), and the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV0838CPW and ADC0838CCN, the TLV0838CDW provides optimal balance of commercial-temperature reliability, SOIC manufacturability, and native 3.3-V compatibility - eliminating level shifters while maintaining drop-in replaceability in existing DW-package layouts.

Availability

TLV0838CDW is available at Aetrix Electronics and suitable for industrial sensor interface, embedded data acquisition, motor control feedback, and portable test equipment requiring stable component supply and long-term production continuity.

Supply support for TLV0838CDW 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 control ICs.

The TLV0838CDW belongs to TI's TLV08xx family of low-voltage serial ADCs, designed specifically for cost-sensitive, space-constrained applications needing reliable 8-bit resolution in 3-V systems without external regulators or reference buffers.

FAQ

What is the maximum clock frequency supported by TLV0838CDW at 3.3 V?

The TLV0838CDW supports up to 600 kHz clock frequency when operated at V_CC = 3.3 V, per the recommended operating conditions table. At this rate, conversion time remains fixed at 8 clock cycles (13.3 µs), though timing margins for setup/hold must be verified per Figure 1. The TLV0838CDW datasheet specifies minimum pulse duration and duty cycle constraints to ensure reliable serial communication and internal state machine operation.

Does TLV0838CDW require an external voltage reference?

No, the TLV0838CDW does not require an external voltage reference. It operates ratiometrically using V_CC as the reference source, enabling full 8-bit encoding of the 0–V_CC input range. An external reference may be applied to the REF pin for improved accuracy or to encode a narrower analog span - but this is optional. The TLV0838CDW internal design ensures monotonicity and ±1 LSB error whether using V_CC or an external REF.

Can TLV0838CDW perform differential measurements between non-adjacent channels?

No, the TLV0838CDW only supports differential measurements between adjacent channel pairs (e.g., CH0–CH1, CH2–CH3, etc.) as defined by its internal multiplexer architecture and address logic table. Pseudodifferential mode using the COM pin allows referencing all channels to a common potential, but true differential comparisons outside adjacent pairs are not supported. This constraint is inherent to the TLV0838CDW silicon design and cannot be overridden by software configuration.

What is the purpose of the SE pin on TLV0838CDW?

On the TLV0838CDW, the SE (Serial Output Format Enable) pin controls the bit order of serial data output: when SE is high, DO outputs MSB-first; when SE is pulled low before initiating conversion, DO outputs LSB-first. This dual-format capability allows flexible alignment with host processor shift-register expectations. The TLV0838CDW functional description confirms SE has no effect on address input or conversion initiation - it solely governs output bit sequencing after conversion completes.

How does TLV0838CDW handle ground separation between analog and digital domains?

The TLV0838CDW provides physically separate ANLG GND and DGTL GND pins to minimize noise coupling between the analog front-end and digital interface circuits. Proper layout requires connecting both grounds at a single point near the device, typically via a low-inductance trace or small copper pour, while routing analog traces away from digital switching paths. This separation is essential to achieving the specified ±1 LSB total unadjusted error and is explicitly required in the TLV0838CDW layout guidelines for high-accuracy applications.