Texas Instruments ADS8548SPM

Overview

ADS8548SPM 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 ADS8548SPM datasheet, ADS8548SPM pinout, ADS8548SPM application, or ADS8548SPM 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 across –40°C to +125°C.

Technical Context

The ADS8548SPM implements eight independent SAR ADCs grouped into four synchronized channel pairs (A–D), each with dedicated reference decoupling pins (REFAP/AN, REFBP/BN, etc.) and individual CONVST_x control inputs. Its dual-interface architecture supports either 16-bit parallel bus access or daisy-chainable SPI-compatible serial communication with configurable clock sourcing (XCLK or internal).

Internal 10-bit string DAC enables precise 0.5–2.5 V or 0.5–3.0 V reference tuning; REFBUFEN and REFEN/WR pins manage buffer enablement and internal reference activation. The device uses separate analog (AVDD/AGND), digital (DVDD/DGND), and high-voltage (HVDD/HVSS) supply domains to maintain signal integrity for ±12 V bipolar inputs.

Key Specifications

Pinout & Package

ADS8548SPM is available in a 64-pin VQFN package (9.0 mm × 9.0 mm) with exposed thermal pad, optimized for high-density industrial PCB layouts requiring low thermal resistance (R_θJA = 22°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8568SPM and AD7606BSTZ, the ADS8548SPM uniquely balances 14-bit precision, 600-kSPS parallel throughput, ±12 V input flexibility, and auto-sleep power efficiency-making it optimal for real-time protection and high-fidelity power analytics where speed and dynamic range are co-critical.

Availability

ADS8548SPM is available at Aetrix Electronics and suitable for protection relays, power quality measurement systems, and multi-axis motor controls requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADS8548SPM 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-including ADS8548SPM-is designed specifically for high-reliability industrial energy monitoring, offering simultaneous sampling, wide input voltage range, and robust thermal performance for harsh operating environments.

FAQ

What is the maximum sampling rate of the ADS8548SPM in parallel interface mode?

The ADS8548SPM achieves a maximum data rate of 600 kSPS per channel in parallel interface mode. This rate is sustained across all eight channels simultaneously when using the 16-bit parallel bus with proper timing compliance per the SBAS543C datasheet Section 7.10. The ADS8548SPM maintains full 14-bit linearity and 85 dB SNR at this rate, making it suitable for demanding real-time applications such as protection relay transient capture.

Does the ADS8548SPM support true bipolar input ranges up to ±12 V?

Yes, the ADS8548SPM supports true bipolar analog input ranges up to ±12 V through its dedicated HVDD (up to +16.5 V) and HVSS (down to –16.5 V) supplies. When configured with the internal 2.5 V reference and RANGE bit set to 0, the full-scale range becomes ±4 × VREF = ±10 V; with external 3.0 V reference, it reaches ±12 V. This eliminates external level-shifting circuitry in CT/PT interfacing applications.

How does the auto-sleep mode reduce power consumption in the ADS8548SPM?

The ADS8548SPM auto-sleep mode reduces active power to 32 mW at 10 kSPS by dynamically gating internal clocks and bias circuits between conversions. Activated via the ASLEEP pin or CONFIG register bit C27, it initiates hold-mode six conversion clock cycles after CONVST assertion. This feature is especially valuable in battery-backed power monitors and thermally constrained PLC modules where average power-not peak power-dictates system viability.

Can the ADS8548SPM be used with an external reference instead of the internal one?

Yes, the ADS8548SPM supports external reference operation. When REFEN/WR is low in hardware mode-or CONFIG bit C15 = 0 in software mode-the internal reference is disabled and the device accepts an external reference voltage (0.5 V to 3.025 V) applied to the REFIO pin. External reference use retains all other features including simultaneous sampling, programmable RANGE control, and auto-sleep, enabling system-level reference sharing or ultra-low-drift metrology designs.

What package options are available for the ADS8548SPM?

ADS8548SPM is offered in a 64-pin VQFN package (RGC suffix, 9.0 mm × 9.0 mm body with exposed thermal pad) and a 64-pin LQFP package (PM suffix, 10.0 mm × 10.0 mm). Both packages are RoHS-compliant and specified over –40°C to +125°C. The VQFN variant provides superior thermal performance (R_θJA = 22°C/W), while the LQFP offers easier manual soldering and legacy footprint compatibility.