Texas Instruments TLV1572CD

Overview

TLV1572CD from Texas Instruments is a 10-bit successive-approximation analog-to-digital converter (ADC) operating from a single 2.7 V to 5.5 V supply in an 8-pin SOIC package. It delivers 1.25 MSPS throughput, < ±1 LSB integral and differential nonlinearity, 59 dB SNR at 500 kHz input, and auto-powerdown mode drawing ≤10 µA. It interfaces directly with TMS320 DSPs and SPI/QSPI microcontrollers for high-speed data acquisition in compact embedded systems.

For engineers reviewing the TLV1572CD datasheet, TLV1572CD pinout, TLV1572CD application, or TLV1572CD equivalent, key selection criteria include its 1.25 MSPS serial ADC performance, SOIC-8 footprint compatibility, 3–5 V single-supply operation, auto-powerdown current budget, and native support for both DSP frame-sync and µC SPI timing modes without glue logic.

Technical Context

The TLV1572CD implements a SAR architecture with inherent sample-and-hold, accepting 0 V to VCC analog inputs and digitizing them using internal reference tracking. Its serial interface operates in two distinct modes-DSP mode (4-wire: CS/SCLK/FS/DO) and µC mode (3-wire: CS/SCLK/DO)-determined by FS pin state at CS falling edge.

Timing is tightly coupled to SCLK: conversion requires 10 clock cycles, sampling occurs on the first SCLK rising edge after CS low (µC mode) or on FS detection (DSP mode), and output data is padded with six leading zeros before the 10-bit result. Auto-powerdown activates after LSB shift-out, reducing supply current to ≤10 µA until next valid CS or FS event.

Key Specifications

Pinout & Package

TLV1572CD is housed in an 8-pin SOIC (D) package with standard JEDEC MS-012AC dimensions (body width 3.9 mm, lead pitch 1.27 mm). Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC top-view convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed serial ADC applications.

Compared with TLV1572ID, TLV1572CD trades extended temperature range for lower cost and same performance in commercial settings; compared with ADS7822U, it sacrifices 2-bit resolution to gain DSP-native timing, lower power-down current, and guaranteed monotonicity at 10 bits.

Availability

TLV1572CD is available at Aetrix Electronics and suitable for mass storage systems, digital servos, and automotive sensor interfaces requiring stable component supply, long-term manufacturability, and SOIC-8 footprint consistency.

Supply support for TLV1572CD 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 innovation.

The TLV1572CD belongs to TI's legacy high-speed serial ADC product line, designed specifically for cost-sensitive, space-constrained applications demanding glueless DSP/microcontroller interfacing and ultra-low idle power.

FAQ

What is the maximum sampling rate of the TLV1572CD and what supply voltage is required to achieve it?

The TLV1572CD achieves its maximum throughput rate of 1.25 MSPS at a 5 V supply with a 20 MHz SCLK. At 3 V, the maximum SCLK is 10 MHz, limiting throughput to 625 KSPS. The device's conversion period is fixed at 10 SCLK cycles, so clock frequency directly determines sampling rate. This makes the TLV1572CD suitable for applications needing either high speed at 5 V or ultra-low power at 3 V, with performance scaling predictably with supply and clock.

How does the TLV1572CD determine whether it is operating in DSP mode or µC (SPI) mode?

The TLV1572CD samples the FS pin twice-on the falling edge of CS and again on an internally delayed CS edge-to determine interface mode. If both latches detect FS low, DSP mode activates; if both detect FS high (i.e., tied to VCC), µC mode activates. A mismatch results in DSP mode by default. This hardware-based mode selection eliminates software configuration errors and ensures deterministic behavior at power-up or reset, making the TLV1572CD robust in mixed-signal systems with varying host controller types.

What is the structure of the serial data frame output by the TLV1572CD?

The TLV1572CD outputs a 16-bit serial frame consisting of six leading zero bits followed by the 10-bit conversion result (MSB first). In DSP mode, the frame begins after FS goes low; in µC mode, it starts on the first SCLK rising edge after CS falls. The DO pin is 3-state and becomes active only during frame transmission. This fixed-length, zero-padded format simplifies µC firmware parsing and ensures compatibility with DSP serial port framing requirements without requiring bit-count negotiation.

Does the TLV1572CD require an external reference voltage, and what are the acceptable input ranges?

Yes, the TLV1572CD requires an external reference voltage applied to the VREF pin, which sets the full-scale analog input range from 0 V to VREF. VREF must be between 2.7 V and VCC, and the analog input (AIN) must stay within 0 V to VREF. The device internally connects VREF– to GND, so no negative reference is supported. Using VREF = VCC enables rail-to-rail input utilization, while a lower VREF improves resolution for small-signal measurements-critical for optimizing dynamic range in sensor front-ends.

What happens to the TLV1572CD's power state during idle periods, and how quickly does it resume conversion?

Upon completion of a conversion (after the LSB is shifted out), the TLV1572CD automatically enters powerdown mode, drawing ≤10 µA. It exits powerdown on the next valid CS falling edge (in µC mode) or FS rising edge (in DSP mode), with sampling beginning on the subsequent SCLK edge. This transition occurs within one SCLK cycle-no wake-up delay or initialization sequence is required. As a result, the TLV1572CD supports true burst-mode acquisition with minimal latency and predictable power cycling, ideal for battery-operated or thermally sensitive applications.