Texas Instruments TLV571IDW

Overview

TLV571IDW from Texas Instruments is an 8-bit parallel analog-to-digital converter (ADC) with single-supply operation (2.7 V to 5.5 V), 1.25 MSPS throughput at 5 V, ±0.5 LSB integral nonlinearity, and hardware/software start-of-conversion control. It integrates an internal oscillator, supports binary or two's complement output, and targets high-speed DSP interfacing in embedded data acquisition systems.

For engineers reviewing the TLV571IDW datasheet, TLV571IDW pinout, TLV571IDW application, or TLV571IDW equivalent, key selection considerations include its 24-pin SOIC (DW) package, dual ground separation (AGND/DGND), REFP/REFM reference flexibility, CSTART-triggered sampling for high-impedance sources, and auto power-down mode reducing current to 1 mA post-conversion.

Technical Context

The TLV571IDW implements a successive-approximation register (SAR) architecture with charge redistribution DAC, requiring exactly 16 clock cycles per conversion (10 for conversion + 6 for sampling in software mode). Its internal clock operates at 9–22 MHz depending on supply voltage and register configuration, while external clock support spans 1–20 MHz with strict 5 ns setup/hold timing relative to CLK.

Control logic uses two user-accessible registers (CR0 and CR1) addressed via D7/A1 and D6/A0 pins; register bits configure oscillator speed, output format (binary/two's complement), start mode (hardware CSTART vs. software WR/RD), and power-down behavior. Hardware configuration is enabled by tying WR low and applying a dummy RD, setting default values for 3-V operation.

Key Specifications

Pinout & Package

TLV571IDW is housed in a 24-pin SOIC (DW) package with exposed pad not present; pin spacing is 1.27 mm, body width 7.5 mm, and total length 15.4 mm. Analog and digital grounds are physically separated (AGND at Pin 21, DGND at Pins 5/8/9) to minimize noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1112CPE+, the TLV571IDW uniquely delivers parallel 8-bit interface, internal oscillator, and hardware CSTART trigger in a 24-pin SOIC - making it the only option among the three that supports deterministic, low-latency acquisition without host processor intervention or external timing components.

Availability

TLV571IDW is available at Aetrix Electronics and suitable for mass storage controllers, digital servo drives, automotive engine management units, and image sensor interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLV571IDW 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 silicon technology for industrial, automotive, and communications markets.

The TLV571IDW belongs to TI's legacy high-speed data acquisition product line, designed specifically for cost-sensitive, medium-resolution applications demanding fast parallel interfacing, flexible power management, and robust analog performance in harsh environments.

FAQ

What is the maximum sampling frequency supported by the TLV571IDW?

The TLV571IDW achieves a maximum throughput rate of 1.25 MSPS at 5 V, which requires a 20 MHz clock input (16 clocks per conversion). At 3 V, the maximum rate is 625 KSPS using a 10 MHz clock. The device does not support oversampling or decimation modes - each conversion consumes exactly 16 clock cycles, so actual sampling frequency equals f_CLK/16. The TLV571IDW internal oscillator can be configured to 9–22 MHz, enabling self-clocked operation without external timing components.

How does the TLV571IDW handle analog input grounding and reference configuration?

The TLV571IDW separates analog (AGND, Pin 21) and digital (DGND, Pins 5/8/9) grounds to minimize noise coupling, and recommends shorting them under the package. Reference is set via REFP (Pin 19) and REFM (Pin 20): REFP nominally connects to AVDD and REFM to AGND, but external references may be applied to define custom full-scale ranges. The TLV571IDW accepts 0 V to AVDD analog input, and REFP − REFM must be ≥2 V and ≤ AVDD − AGND. This dual-reference architecture supports ratiometric sensor interfaces and isolated signal chains.

Can the TLV571IDW operate without an external clock source?

Yes, the TLV571IDW includes an internal oscillator that can serve as the system clock (SYSCLK). When CR0.D3 = 0, the internal oscillator activates - running at 9–11 MHz at 3 V or 18–22 MHz at 5 V, configurable via CR1.D4. The oscillator starts automatically on the falling edge of CSTART or rising edge of WR/RD. No external crystal or clock generator is needed, simplifying layout and reducing BOM cost. However, external clock (1–20 MHz) remains supported for systems requiring precise jitter control or synchronization across multiple devices.

What are the power-down modes available on the TLV571IDW and how are they activated?

The TLV571IDW offers two distinct power-down modes: auto power-down (1 mA max) and software power-down (10 µA max). Auto power-down engages automatically 50 ns after conversion completes if no RD signal is detected. Software power-down is entered by pulling CS high to DVDD, preserving register contents. Both modes disable the clock buffer and comparator while retaining control register state. Resume time is 1 clock cycle for auto mode and 2 clocks for software mode. These features make the TLV571IDW suitable for battery-powered or thermally constrained applications where duty-cycled acquisition is used.

Is the TLV571IDW pin-compatible with other members of the TLV57x family?

No, the TLV571IDW is not pin-compatible with other TLV57x variants such as TLV572 or TLV574. While sharing functional similarities (parallel interface, SAR architecture, internal oscillator), the TLV571IDW uses a unique 24-pin SOIC (DW) pinout optimized for single-channel operation, whereas TLV572 (dual-channel) and TLV574 (quad-channel) require different pin allocations for additional analog inputs and channel-select logic. The TLV571IDW pinout is identical only to TLV571IPW (24-pin TSSOP), differing solely in package type - no other TLV57x part shares its exact terminal mapping or control register structure.