Texas Instruments ADS8528SPMR

Overview

ADS8528SPMR from Texas Instruments is a 12-bit, 8-channel simultaneous-sampling SAR ADC with true bipolar inputs, 650 kSPS parallel/480 kSPS serial data rate, 73.9 dB SNR, –89 dB THD, and programmable internal reference supporting ±12 V input ranges. It serves as the core analog acquisition engine in high-accuracy industrial protection relays.

For engineers reviewing the ADS8528SPMR datasheet, ADS8528SPMR pinout, ADS8528SPMR application, or ADS8528SPMR equivalent, key selection criteria include simultaneous sampling capability across four channel pairs, auto-sleep power management (32 mW at 10 kSPS), hardware/software mode configurability, ±12 V input support via programmable reference, and operation over –40°C to +125°C.

Technical Context

The ADS8528SPMR implements eight independent SAR converters grouped into four synchronized channel pairs (A–D), each with dedicated analog front-end references (REFAP/AN, REFBN/P, etc.) and individual conversion start inputs (CONVST_A–D). Its dual-mode interface (parallel or serial with daisy-chain) enables flexible system integration without sacrificing timing determinism.

Configuration is supported via hardware pins (HW/SW, PAR/SER, RANGE/XCLK) or software register writes (CONFIG register, C[29:0]), allowing dynamic control of input range per channel pair, reference buffer enable, standby mode, and clock source selection - all while maintaining full simultaneous sampling integrity.

Key Specifications

Pinout & Package

ADS8528SPMR is packaged in a 64-pin VQFN (9.0 mm × 9.0 mm) with exposed thermal pad, optimized for high-density industrial PCB layouts and efficient heat dissipation in sealed enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8548SPMR and AD7606BSTZ, the ADS8528SPMR uniquely balances 12-bit precision, 650 kSPS simultaneous throughput, ±12 V input support, and auto-sleep power efficiency - making it optimal for protection-class applications demanding both speed and wide dynamic range.

Availability

ADS8528SPMR is available at Aetrix Electronics and suitable for protection relays, power quality meters, and multi-axis motor controls requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADS8528SPMR 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 specializing in analog and embedded processing technologies, with leadership in precision data converters and industrial signal chain solutions.

The ADS85x8 family was designed specifically for high-reliability industrial energy monitoring and protection systems requiring simultaneous sampling, wide input voltage tolerance, and extended temperature operation.

FAQ

What is the maximum sampling rate of the ADS8528SPMR in parallel interface mode?

The ADS8528SPMR achieves a maximum data rate of 650 kSPS per channel in parallel interface mode. This rate applies to all eight channels operating simultaneously, enabled by its four synchronized SAR cores and dedicated CONVST inputs. The device maintains this performance across the full –40°C to +125°C temperature range, with timing validated under recommended operating conditions (HVDD = 15 V, AVDD = 5 V, DVDD = 3.3 V).

Does the ADS8528SPMR support true bipolar input ranges up to ±12 V?

Yes, the ADS8528SPMR supports true bipolar input ranges up to ±12 V through its programmable internal reference. When configured for ±4×VREF operation with the internal DAC set to 3.0 V output, the full-scale range becomes ±12 V. This capability eliminates the need for external level-shifting circuitry in high-voltage industrial sensing applications such as protection relay voltage inputs.

How does the auto-sleep mode reduce power consumption in the ADS8528SPMR?

The ADS8528SPMR auto-sleep mode reduces power to 32 mW at 10 kSPS by dynamically disabling internal clock sources and reference buffers between conversions while preserving configuration state. Activation is controlled via the ASLEEP pin or CONFIG register bit C27, and wake-up occurs synchronously with the next CONVST pulse - ensuring no latency penalty or calibration loss during low-duty-cycle operation.

Can the ADS8528SPMR perform independent sampling on different channel pairs at varying data rates?

Yes, the ADS8528SPMR supports independent sampling on channel pairs A–D using separate CONVST_A–D inputs, but with a constraint: channel pair A must always operate at the highest data rate when mixed-rate configurations are used. This ensures deterministic timing alignment for the master channel pair, while other pairs may be sampled less frequently - useful in applications like motor drives where phase current updates require higher priority than temperature monitoring.

What package type and thermal characteristics does the ADS8528SPMR use?

The ADS8528SPMR uses a 64-pin VQFN package (9.0 mm × 9.0 mm) with an exposed thermal pad. Its thermal metrics include RθJA = 22°C/W (junction-to-ambient) and RθJB = 3.6°C/W (junction-to-board), enabling reliable operation at full speed in industrial environments up to +125°C ambient when mounted on a 4-layer PCB with adequate copper pour and thermal vias beneath the pad.