Texas Instruments TLV1570CPWG4

Overview

TLV1570CPWG4 from Texas Instruments is a 10-bit, 8-channel serial analog-to-digital converter (ADC) with 1.25 MSPS throughput at 5 V and 625 KSPS at 3 V, operating from a single 2.7–5.5 V supply. It integrates an on-chip 8-input multiplexer, internal reference (2.3 V or 3.8 V), SAR architecture, and SPI/QSPI-compatible 4-/5-wire serial interface. It serves in high-speed DSP acquisition systems requiring multi-channel sampling with low power - e.g., automotive sensor data logging.

For engineers reviewing the TLV1570CPWG4 datasheet, TLV1570CPWG4 pinout, TLV1570CPWG4 application, or TLV1570CPWG4 equivalent, key selection considerations include its 10-bit resolution, channel auto-scan capability, autopower-down (300 µA) and software power-down (10 µA) modes, differential nonlinearity < ±1 LSB, and compatibility with TMS320 DSPs and SPI microcontrollers without glue logic.

Technical Context

The TLV1570CPWG4 implements a successive-approximation register (SAR) ADC with binary-weighted capacitor array and CMOS threshold detector. Its conversion cycle requires exactly 16 SCLK edges, limiting maximum sampling frequency to f_SCLK/16 - e.g., 1.25 MSPS at 20 MHz SCLK. The on-chip MUX output (MO) is independently accessible, enabling shared signal conditioning (e.g., antialiasing filter) across all eight analog inputs (CH0–CH7).

It supports two operational modes: DSP mode (FS-driven frame sync) and microcontroller mode (FS pulled high). Configuration is performed via 16-bit control register written to SDIN, with settings taking effect on the next cycle. Internal reference selection (DI6=1) and voltage level (DI5) are programmable, while external reference mode requires 0.1 µF decoupling between REF and AGND.

Key Specifications

Pinout & Package

Packaged in 20-pin TSSOP (PW), the TLV1570CPWG4 uses a surface-mount small-outline package with 0.65 mm lead pitch and exposed thermal pad (G4 suffix denotes green/RoHS-compliant finish).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit, multi-channel serial ADC applications.

Compared with ADS7822U and TLV2548IPW, the TLV1570CPWG4 delivers the highest throughput (1.25 MSPS) and DSP-native frame sync (FS), making it optimal for real-time control loops and high-speed data acquisition where timing determinism and minimal host intervention are critical - despite its 10-bit resolution ceiling.

Availability

TLV1570CPWG4 is available at Aetrix Electronics and suitable for mass storage systems, automotive sensor monitoring, digital servo control, and image sensor signal chain applications requiring stable component supply, RoHS compliance, and long-term industrial availability.

Supply support for TLV1570CPWG4 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 digital signal technologies, with decades of expertise in precision data converters and industrial-grade ICs.

The TLV1570CPWG4 belongs to TI's legacy high-speed serial ADC product line, designed specifically for cost-sensitive, space-constrained embedded systems needing multi-channel analog acquisition with minimal external components and direct DSP/microcontroller integration.

FAQ

What is the maximum sampling frequency supported by the TLV1570CPWG4?

The TLV1570CPWG4 achieves a maximum sampling frequency of 1.25 MSPS at 5 V (requiring 20 MHz SCLK) and 625 KSPS at 3 V (requiring 10 MHz SCLK). This is derived from its fixed 16-SCLK-per-conversion timing - fs = f_SCLK/16. Exceeding recommended SCLK frequencies violates setup/hold timing and degrades AC performance like SINAD and THD.

Does the TLV1570CPWG4 support true differential input operation?

No, the TLV1570CPWG4 does not support true differential analog inputs. It accepts only single-ended inputs across CH0–CH7 and AIN, with full-scale range defined from AGND to AVDD (or external REF). Its internal SAR architecture uses REF+ tied to REF and REF– tied to AGND, making it inherently pseudo-differential - common-mode rejection relies on external circuitry.

How does the channel auto-scan feature work in the TLV1570CPWG4?

The TLV1570CPWG4's channel auto-scan is enabled via control bit DI10. When activated, it sequentially samples CH0–CH7 (or user-defined subsets like CH0/CH2/CH4/CH6) without reprogramming the channel select bits (DI9–DI7) each cycle. The sequence resets via DI7, and configuration is updated per conversion cycle via SDIN - enabling deterministic, low-CPU-overhead multi-channel acquisition.

Can the TLV1570CPWG4 operate with separate analog and digital supply voltages?

Yes, the TLV1570CPWG4 has independent AVDD (analog) and DVDD (digital) pins, both rated 2.7–5.5 V. However, the absolute difference |AVDD − DVDD| must remain below 0.5 V per datasheet specifications. This requirement ensures proper internal biasing and prevents latch-up - so AVDD and DVDD should be sourced from tightly regulated, closely tracked rails.

What is the purpose of the MO (MUX Output) pin on the TLV1570CPWG4?

The MO pin exposes the buffered output of the internal 8:1 analog multiplexer, placed *before* the ADC core. This allows designers to insert shared signal conditioning - such as an anti-aliasing filter, gain amplifier, or level shifter - between MO and AIN. Using one circuit for all eight channels reduces component count, board area, and matching errors versus per-channel conditioning.