Texas Instruments TLV0838CPW

Overview

TLV0838CPW 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 input configurations, and achieves 32 µs conversion time at 250 kHz clock - used in sensor signal conditioning for industrial monitoring systems.

For engineers reviewing the TLV0838CPW datasheet, TLV0838CPW pinout, TLV0838CPW application, or TLV0838CPW equivalent, key selection criteria include its TSSOP-20 package, 0°C to 70°C temperature grade, software-configurable channel addressing, SE-controlled LSB-first/MSB-first data output, and compatibility with TTL/MOS logic levels in microprocessor-interfaced data acquisition designs.

Technical Context

The TLV0838CPW implements a sample-data comparator architecture with SAR conversion logic, using an internal resistive ladder and successive-approximation register. Its multiplexer is fully software-addressed via a 3–4-bit serial command sequence on the DI line, enabling dynamic reconfiguration of input polarity and mode per channel pair.

Conversion initiation requires CS low followed by clocked start-bit and address bits; SARS asserts high during conversion, and DO outputs MSB-first data after one-clock settling delay. The SE pin selects LSB-first output mode, and COM serves as common reference for pseudodifferential operation across all eight channels.

Key Specifications

Pinout & Package

TSSOP-20 package (7.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant, moisture sensitivity level 1, rated for 0°C to 70°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV0838IPW, the TLV0838CPW trades extended temperature range for lower cost and same-pinout compatibility in commercial environments; versus ADC0838CCN, it delivers improved power efficiency and surface-mount manufacturability while retaining functional equivalence.

Availability

TLV0838CPW is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical instrumentation, smart energy metering, and automotive cabin monitoring requiring stable component supply and long-term production continuity.

Supply support for TLV0838CPW 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 expertise.

The TLV0838CPW belongs to TI's TLV083x family of low-voltage serial ADCs, designed specifically for cost-sensitive, space-constrained applications needing flexible input configuration and direct 3.3-V interfacing without external support components.

FAQ

What is the maximum clock frequency supported by the TLV0838CPW?

The TLV0838CPW supports up to 600 kHz clock frequency when operating at V_CC = 3.3 V, and 250 kHz at V_CC = 2.7 V. Conversion time remains fixed at eight clock cycles regardless of frequency, so higher clocks reduce total conversion latency. Exceeding recommended duty cycle (40–60%) requires minimum 1 µs pulse width for reliable operation. The TLV0838CPW datasheet specifies these limits under recommended operating conditions.

Does the TLV0838CPW require an external voltage reference?

No, the TLV0838CPW operates ratiometrically using V_CC as the reference, enabling full-scale encoding of 0–V_CC inputs without external components. An external reference can be applied to the REF pin for improved accuracy or custom scaling, but it is optional. The TLV0838CPW maintains ±1 LSB total unadjusted error with either reference source, as confirmed in its electrical characteristics table.

How does the SE pin affect data output format on the TLV0838CPW?

The SE pin on the TLV0838CPW controls whether DO outputs MSB-first (SE high) or LSB-first (SE low). To enable LSB-first mode, SE must be driven low *before* CS goes low to initiate conversion; the setting is latched at CS assertion. The TLV0838CPW does not support mid-conversion format changes - the SE state at conversion start determines the entire output stream order.

Can the TLV0838CPW perform differential measurements between non-adjacent channels?

No, the TLV0838CPW only supports differential measurements between adjacent channel pairs (e.g., CH0/CH1, CH2/CH3, ..., CH6/CH7) as defined by its internal MUX-address logic table. Pseudodifferential mode uses the COM pin as common negative reference for all channels, but true differential comparisons are restricted to predefined adjacent pairs. This limitation is inherent to the TLV0838CPW's hardware architecture and documented in its functional description.

What is the purpose of separate DGTL GND and ANLG GND pins on the TLV0838CPW?

The TLV0838CPW features separate DGTL GND and ANLG GND pins to isolate digital switching noise from the sensitive analog sampling circuitry. Routing these grounds to distinct PCB copper pours - joined only at a single point near the power supply - minimizes ground bounce-induced errors in conversion results. This separation is critical for maintaining the TLV0838CPW's specified ±1 LSB accuracy, especially in mixed-signal systems with high-speed digital activity.