Texas Instruments ADS8548SPMR

Overview

ADS8548SPMR from Texas Instruments is a 14-bit, 8-channel simultaneous-sampling SAR ADC with true bipolar inputs, 600 kSPS parallel or 450 kSPS serial data rate, 85 dB SNR, –91 dB THD, and programmable internal reference supporting ±12 V input ranges. It serves as the core analog front-end in high-accuracy industrial power monitoring systems.

For engineers reviewing the ADS8548SPMR datasheet, ADS8548SPMR pinout, ADS8548SPMR application, or ADS8548SPMR equivalent, key selection criteria include simultaneous sampling capability across four channel pairs, auto-sleep power scaling down to 32 mW at 10 kSPS, hardware/software mode configurability, and operation over –40°C to +125°C.

Technical Context

The ADS8548SPMR implements eight independent SAR converters grouped into four synchronized channel pairs (A–D), each with dedicated analog input pins (e.g., CH_A0/CH_A1) and configurable voltage range control via RANGE pin or CONFIG register bits. Conversion timing is triggered by individual CONVST_x signals or synchronized start.

It supports dual interface modes: 16-bit parallel bus with CS/WR/RD control and daisy-chain-capable 4-wire SPI (SCLK/SDI/SDO_A–D/FS), with flexible reference architecture-internal 2.5 V or 3.0 V DAC-tuned reference (10-bit resolution, ±0.1 LSB DNL) or external REFIO sourcing.

Key Specifications

Pinout & Package

ADS8548SPMR is housed in a 64-pin VQFN package (9.0 mm × 9.0 mm) with exposed thermal pad, optimized for high-density industrial PCB layouts and thermal dissipation in enclosed environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8548SPMR, ADS8568IPM delivers 6.5 dB higher SNR but trades 90 kSPS parallel speed and adds 13 mW static power; AD7606BSTZ offers identical channel count and robustness but lacks programmable reference, simultaneous SER/PAR mode, and auto-sleep-limiting adaptability in thermally constrained or multi-rate systems.

Availability

ADS8548SPMR is available at Aetrix Electronics and suitable for protection relays, power quality analyzers, and multi-axis motor controls requiring stable component supply across extended industrial temperature ranges and long production lifecycles.

Supply support for ADS8548SPMR 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 interface solutions.

The ADS85x8 family-including ADS8548SPMR-is designed specifically for simultaneous-sampling applications in harsh industrial environments, emphasizing bipolar input fidelity, wide temperature operation, and flexible digital interfacing for protection, control, and measurement systems.

FAQ

What is the maximum sampling rate per channel for ADS8548SPMR in parallel interface mode?

The ADS8548SPMR achieves a maximum data rate of 600 kSPS per channel when configured in parallel interface mode. This rate is guaranteed across the full –40°C to +125°C operating temperature range and supports real-time acquisition in demanding applications such as protection relay trip logic and servo current loop control. The ADS8548SPMR maintains this performance without external clock multiplication or oversampling.

Does ADS8548SPMR support true bipolar input ranges up to ±12 V?

Yes, ADS8548SPMR supports true bipolar input ranges up to ±12 V by combining its programmable internal reference (2.5 V or 3.0 V) with the RANGE pin or CONFIG register setting. When configured for ±4×VREF mode with a 3.0-V reference, the device accepts ±12 V differential inputs directly-eliminating external signal conditioning stages in industrial voltage and current sensing circuits.

How does the auto-sleep mode function in ADS8548SPMR, and what power savings does it provide?

The ADS8548SPMR auto-sleep mode activates six conversion clock cycles after a CONVST_x signal, automatically entering low-power hold state until the next conversion trigger. At 10 kSPS, this reduces total power consumption to 32 mW-down from ~120 mW in full active mode. This feature is hardware-controlled via the ASLEEP pin and requires no firmware intervention, making it ideal for battery-backed or thermally constrained industrial controllers.

Can ADS8548SPMR be used in daisy-chain configurations with other ADCs, and which pins enable this?

Yes, ADS8548SPMR supports daisy-chain operation via its DB0–DB3 pins (DCIN_D–DCIN_A) and SDO_A–SDO_D outputs. When DCEN = 1 and SEL_B/SEL_CD are asserted, these pins route serial data from upstream devices, allowing up to 32 synchronized channels across four ADS8548SPMR units using a single SPI master. Daisy-chain mode preserves full 14-bit resolution and timing alignment without added latency.

What package type and thermal characteristics apply to ADS8548SPMR?

ADS8548SPMR is supplied in a 64-pin VQFN package (RGC variant) measuring 9.0 mm × 9.0 mm with an exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 22°C/W, and junction-to-board (RθJB) is 3.6°C/W-enabling reliable operation at full speed in compact, sealed enclosures without forced airflow. The package is RoHS-compliant and qualified for industrial reflow profiles.