Texas Instruments TLV1544CPWR

Overview

TLV1544CPWR from Texas Instruments is a 10-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated 4-channel analog multiplexer, SPI/QSPI-compatible serial interface, and programmable power-down mode. It operates from 2.7 V to 5.5 V, achieves ≤10 µs conversion time, supports asynchronous sampling via CSTART, and delivers 1 µA typical standby current. It is used in battery-powered data acquisition systems requiring low-voltage, low-power, and microprocessor/DSP interfacing.

For engineers reviewing the TLV1544CPWR datasheet, TLV1544CPWR pinout, TLV1544CPWR application, or TLV1544CPWR equivalent, key selection considerations include its 4-input channel count (vs. 8-channel TLV1548), PW package thermal profile, industrial-grade temperature range compatibility, and hardware-configurable sampling timing via CSTART and INV CLK.

Technical Context

The TLV1544CPWR implements a switched-capacitor SAR architecture with an on-chip 11-channel multiplexer (4 external analog inputs + 3 internal self-test voltages). Its serial interface supports two distinct modes-microprocessor (CS-triggered, rising/falling edge clocking per INV CLK) and TMS320 DSP (FS-triggered, inverted timing logic)-with EOC flag and three-state DATA OUT for bus sharing.

Sampling is either fixed (6 I/O CLK cycles after fourth edge) or extended (CSTART-controlled acquisition time), and conversion rate is software-selectable (fast: ~7 µs, slow: ~15 µs). Reference inputs REF+ and REF– enable ratiometric operation, while differential high-impedance reference pins isolate analog circuitry from digital noise.

Key Specifications

Pinout & Package

Texas Instruments TLV1544CPWR is housed in a 20-pin TSSOP (PW) package with 0.65 mm pitch, optimized for compact PCB layouts and thermal dissipation up to 604 mW at 25°C (derated to 302 mW at 70°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with TLV1544CPWR, TLV1544CDR offers identical functionality in a through-hole-compatible package but sacrifices board space and thermal efficiency, while ADS7822U trades built-in diagnostics and flexible sampling for higher resolution and speed - making TLV1544CPWR optimal for cost-sensitive, battery-operated systems needing robust timing control and self-validation.

Availability

TLV1544CPWR is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive cabin controls, and smart energy meters requiring stable component supply across commercial temperature grades.

Supply support for TLV1544CPWR 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 heritage in precision data converters and industrial-grade IC design.

The TLV1544CPWR belongs to TI's low-voltage precision SAR ADC family, engineered for battery-powered and space-constrained applications where power efficiency, serial interface flexibility, and integrated diagnostics are critical.

FAQ

What is the maximum I/O CLK frequency supported by TLV1544CPWR at 3.3 V supply?

The TLV1544CPWR supports up to 2.81 MHz I/O CLK at 3.3 V when analog input source impedance is ≤100 Ω, and 2.39 MHz when impedance is ≤1 kΩ. These limits derive from internal charge redistribution timing and are specified in TI's SLAS139C datasheet Table 1. Exceeding these frequencies may cause conversion errors or missing EOC assertion. Always validate timing margins with actual layout parasitics and source impedance.

Does TLV1544CPWR support true differential input mode?

No, TLV1544CPWR does not support true differential analog inputs. It provides four single-ended analog inputs (A0–A3) and a differential reference pair (REF+, REF–) for ratiometric operation. The internal multiplexer routes each channel to a common ADC core referenced to REF+ and REF–. For differential signal acquisition, external instrumentation amplifiers must be used ahead of TLV1544CPWR inputs.

How is the TLV1544CPWR power-down mode activated and exited?

The TLV1544CPWR power-down mode is activated by writing 0x08 (binary 1000) to the 4-bit input register via DATA IN during an active CS cycle. This reduces supply current to 1 µA typical. Exit occurs automatically on the next CS low transition, restoring normal operation with the previously selected conversion rate intact. No reset sequence is required, and the first conversion after wake-up should be discarded per datasheet guidance.

Can TLV1544CPWR interface directly with an Arduino Uno without level shifting?

Yes, TLV1544CPWR can interface directly with Arduino Uno (5 V logic) when operated at VCC = 5 V, as its digital I/O pins (CS, DATA IN, DATA OUT, I/O CLK, EOC, FS, INV CLK) are 5 V tolerant. At VCC = 3.3 V, level shifting is required for Arduino's 5 V outputs driving CS/DATA IN/I/O CLK, though DATA OUT remains safe for Arduino input. Confirm VCC setting matches host logic levels before connection.

What is the function of the CSTART pin in TLV1544CPWR, and when is it required?

The CSTART pin in TLV1544CPWR enables asynchronous sampling: its falling edge initiates acquisition, and its low duration sets the sampling time - essential for analog sources with >1 kΩ output impedance to ensure capacitor array settling. It is required when sampling high-impedance sensors (e.g., thermocouples, pH electrodes) or when precise external event synchronization (e.g., to PWM edges or encoder pulses) is needed. If unused, CSTART must be tied to VCC.