Texas Instruments TLC0834IPW

Overview

TLC0834IPW from Texas Instruments is a 4-channel, 8-bit successive-approximation analog-to-digital converter (ADC) with serial control interface, operating from –40°C to 85°C and requiring only a single 5-V supply. It supports ratiometric or fixed 5-V reference operation, delivers ±1 LSB total unadjusted error, and achieves 32 µs conversion time at 250 kHz clock frequency. It is used in industrial sensor signal conditioning where compact serial ADCs interface directly with microcontrollers over minimal wiring.

For engineers reviewing the TLC0834IPW datasheet, TLC0834IPW pinout, TLC0834IPW application, or TLC0834IPW equivalent, key selection criteria include its 4-channel multiplexer configuration, software-selectable single-ended/differential input modes, TSSOP-14 package compatibility, and absence of internal voltage reference-requiring external REF connection for full-scale accuracy.

Technical Context

The TLC0834IPW implements a sample-data comparator architecture with an internal SAR engine and configurable 4-input analog multiplexer. Channel selection and input polarity (single-ended, differential, or pseudodifferential) are controlled via a 4-bit serial address word shifted in through DI, with CS enabling logic and CLK synchronizing all operations.

Its serial interface outputs MSB-first data on DO after one clock-cycle multiplexer settling delay, and supports bidirectional DI/DO sharing using a single microcontroller I/O line. The device lacks an internal Zener regulator-unlike ADC0834-so external reference stability directly determines full-scale accuracy.

Key Specifications

Pinout & Package

TLC0834IPW uses a 14-pin TSSOP (PW) package with 0.65 mm pitch, 5.0 mm × 4.4 mm body, and exposed pad not internally connected. Pin 1 is marked by a dot; pins are numbered counterclockwise from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel, 8-bit serial ADC applications.

Compared with ADC0834CCN, TLC0834IPW avoids Zener current overhead and supports surface-mount assembly; compared with TLC0834CDR, it guarantees operation down to –40°C-critical for outdoor or factory-floor deployments where cold startup or thermal cycling occurs.

Availability

TLC0834IPW is available at Aetrix Electronics and suitable for industrial sensor interface, embedded data acquisition, motor control feedback, and power supply monitoring requiring stable component supply across extended temperature ranges.

Supply support for TLC0834IPW 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 specializing in analog, embedded processing, and connectivity technologies with decades of precision data converter leadership.

The TLC0834 product line delivers cost-optimized, serial-interface ADCs for resource-constrained industrial and embedded systems-designed to reduce system-level complexity while maintaining robust performance across wide temperature ranges.

FAQ

What is the maximum clock frequency supported by the TLC0834IPW?

The TLC0834IPW supports clock frequencies from 10 kHz to 600 kHz per its recommended operating conditions. At 600 kHz, conversion time remains eight clock periods (13.3 µs), but timing margins for setup/hold and propagation delay shrink-designers must verify signal integrity and ensure t_su ≥ 350 ns and t_h ≥ 90 ns at the device pins. The TLC0834IPW datasheet specifies 250 kHz as the typical test condition for electrical characteristics.

Does the TLC0834IPW include an internal voltage reference?

No, the TLC0834IPW does not include an internal voltage reference. It requires an external reference voltage applied to the REF pin, which defines the full-scale input range (0 V to V_REF). This differs from the functionally equivalent ADC0834, which integrates a 5-V Zener reference. Using an external REF allows design flexibility-for example, scaling to 2.5 V full scale-but places responsibility for reference stability and noise performance on the system designer.

Can the TLC0834IPW perform differential measurements between non-adjacent channels?

No, the TLC0834IPW only supports differential measurements between adjacent channel pairs: CH0–CH1 and CH2–CH3. Its internal multiplexer architecture and serial address encoding do not allow cross-pair differential configurations (e.g., CH0 vs CH2). Each differential pair operates independently, with polarity selectable via the ODD/EVEN and SGL/DIF bits in the 4-bit address word. Pseudodifferential mode is not available on the TLC0834IPW-it is exclusive to the 8-channel TLC0838 variant.

What is the purpose of the SARS pin on the TLC0834IPW?

The SARS (Start of Approximation Register Status) pin on the TLC0834IPW is an open-drain output that goes high when conversion begins and returns low when complete. It provides hardware visibility into conversion progress-enabling polling or interrupt-driven synchronization without reading DO. For example, a microcontroller can wait for SARS high-to-low transition before reading the 8-bit result from DO, eliminating need for fixed-delay timing loops. The TLC0834IPW datasheet confirms SARS assertion coincides with internal SAR activation after multiplexer settling.

How does the TLC0834IPW handle unused analog input channels during conversion?

Unused analog input channels on the TLC0834IPW exhibit standby input currents of ≤ ±1 µA (per datasheet Section 8), with leakage paths isolated by internal switch matrix. When a channel is unselected, its input remains high-impedance and electrically disconnected from the SAR core-minimizing crosstalk and power consumption. However, designers must still terminate unused CHx pins to AGND or a known potential to prevent floating inputs from coupling noise or causing ESD susceptibility; the TLC0834IPW does not auto-shutdown or bias unselected channels.