Texas Instruments ADS8558IPM

Overview

ADS8558IPM from Texas Instruments is a 16-bit, six-channel simultaneous-sampling SAR ADC with true bipolar inputs, 730 kSPS parallel/500 kSPS serial throughput, ±12 V input range support, and integrated programmable 0.5–3.0 V reference DAC. It enables high-accuracy power quality monitoring and protection relay systems requiring synchronized multi-channel acquisition.

For engineers reviewing the ADS8558IPM datasheet, ADS8558IPM pinout, ADS8558IPM application, or ADS8558IPM equivalent, key selection criteria include simultaneous sampling across three channel pairs (A/B/C), hardware/software mode configurability, LQFP-64 package compatibility, and operation over –40°C to 125°C industrial temperature range.

Technical Context

The ADS8558IPM integrates six independent SAR ADCs grouped into three simultaneously triggered pairs (CH_A0/A1, CH_B0/B1, CH_C0/C1), each with dedicated sample-and-hold and reference decoupling (REFC_A/B/C). Its dual-mode interface supports pin-strapped hardware control or register-based software configuration via a 32-bit control register.

It features a programmable internal reference DAC (10-bit, 0.2×VREF to VREF), selectable ±2×VREF or ±4×VREF input ranges, and three power-down modes (deep standby, partial, auto-nap) with sub-50 μA quiescent current in full shutdown. Clocking supports internal conversion clock or external XCLK up to 20 MHz.

Key Specifications

Pinout & Package

LQFP-64 package (10.00 mm × 10.00 mm), thermally enhanced with exposed pad; compatible with standard surface-mount reflow profiles and industrial PCB assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.

Compared with ADS8556IPM and ADS8557IPM, the ADS8558IPM delivers the highest sampling rate (730 kSPS) and best SNR (94 dB) in the family-making it the preferred choice for next-generation protection relays and wideband power analyzers demanding both speed and precision.

Availability

ADS8558IPM is available at Aetrix Electronics and suitable for power quality monitoring, protection relay development, and multi-axis motor control applications requiring stable component supply across extended industrial temperature ranges and long production lifecycles.

Supply support for ADS8558IPM 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 and embedded processing technologies, with decades of expertise in high-precision data converters and industrial-grade signal chain solutions.

The ADS855x product line was designed specifically for high-reliability, simultaneous-sampling applications in power infrastructure, factory automation, and energy systems-emphasizing thermal robustness, channel-to-channel synchronization, and flexible reference architecture.

FAQ

What is the maximum sampling rate of the ADS8558IPM in parallel interface mode?

The ADS8558IPM achieves a maximum sampling rate of 730 kSPS per channel in parallel interface mode. This rate is specified with internal conversion clock and reference, and supports true simultaneous sampling across all six channels. The device maintains this performance across its full –40°C to 125°C operating temperature range, making ADS8558IPM suitable for high-speed industrial data acquisition where timing consistency is critical.

Does the ADS8558IPM support external reference voltage input?

Yes, the ADS8558IPM supports external reference voltage input via the REFIO pin, accepting 0.5 V to 3.025 V. When using an external reference, the internal reference DAC is disabled, and the REFEN/WR pin must be held low in hardware mode or bit C25 (REFEN) cleared in software mode. This flexibility allows ADS8558IPM to interface with ultra-low-noise external references for applications demanding tighter than ±10 ppm/°C drift performance.

How many analog input channels does the ADS8558IPM have, and how are they organized?

The ADS8558IPM has six fully independent analog input channels, organized into three synchronized pairs: CH_A0/CH_A1, CH_B0/CH_B1, and CH_C0/CH_C1. Each pair shares a common CONVST_x trigger input but operates with separate sample-and-hold circuits and reference paths (REFC_A/B/C), ensuring true simultaneous acquisition with <250 ps inter-channel aperture matching. This architecture makes ADS8558IPM ideal for three-phase system monitoring where phase alignment is mandatory.

What power supply rails are required for the ADS8558IPM to operate correctly?

The ADS8558IPM requires four independent supply rails: AVDD (4.5–5.5 V) for analog core, BVDD (2.7–5.5 V) for digital I/O buffers, HVDD (+5–16.5 V) for positive analog input swing, and HVSS (–16.5 to –5 V) for negative analog input swing. Each rail has specific decoupling requirements-e.g., 100 nF + 10 μF ceramics per AVDD pin-and must be routed with dedicated planes to maintain ADS8558IPM's 94 dB SNR and channel isolation specifications.

Can the ADS8558IPM operate in both hardware and software configuration modes?

Yes, the ADS8558IPM supports dual configuration modes selected by the HW/SW pin. In hardware mode (HW/SW = 0), functionality is controlled by external pins (RANGE/XCLK, PAR/SER, WORD/BYTE, etc.). In software mode (HW/SW = 1), all features-including reference voltage, input range, and interface timing-are configured via a 32-bit control register accessed through parallel or serial interface. This dual-mode capability allows ADS8558IPM to serve both simple plug-and-play systems and complex programmable platforms.