Texas Instruments ADS8332IPWR

Overview

ADS8332IPWR from Texas Instruments is a 16-bit, 500-kSPS, 8-channel unipolar-input successive approximation register (SAR) analog-to-digital converter with integrated 8:1 multiplexer, SPI-compatible serial interface, and daisy-chain capability. It operates from 2.7 V to 5.5 V analog supply, achieves ±1.2 LSB max INL and 91.5 dB SNR at 1 kHz, and targets precision data acquisition in industrial sensor interfaces.

For engineers reviewing the ADS8332IPWR datasheet, ADS8332IPWR pinout, ADS8332IPWR application, or ADS8332IPWR equivalent, key selection considerations include its 8-channel MUX architecture, 24-pin VQFN package, programmable EOC/INT/CDI status pin, Auto-NAP power mode (8.7 mW at 250 kSPS), and support for external reference voltages from 1.2 V to 4.096 V.

Technical Context

The ADS8332IPWR implements a capacitor-based SAR ADC core with inherent sample-and-hold, driven by an internal 11 MHz conversion clock (CCLK) or externally synchronized SCLK. Its 8:1 analog multiplexer supports both manual and auto-triggered channel selection, with MUXOUT enabling breakout for external signal conditioning before ADCIN.

Digital control uses a 4-wire SPI/DSP-compatible interface (FS/CS, SCLK, SDI, SDO), supporting frame-sync operation, daisy-chain configuration across multiple devices, and global CONVST independent of chip select. Power management includes Deep PD (250 nA), Nap (500 µA), and Auto-NAP modes, all configurable via hardware pins or serial commands.

Key Specifications

Pinout & Package

ADS8332IPWR is housed in a 24-pin VQFN package (4.00 mm × 4.00 mm) with exposed thermal pad connected to AGND. Pin functions are electrically identical to the TSSOP variant but differ in physical layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8332IPWR, ADS8688IPWR offers integrated signal conditioning at the expense of MUXOUT flexibility, while AD7606C-16BSTZ delivers higher speed and bipolar capability at significantly increased power and board space-making ADS8332IPWR optimal for low-power, unipolar, MUX-flexible industrial DAQ.

Availability

ADS8332IPWR is available at Aetrix Electronics and suitable for industrial process controls, medical instruments, magnetometer arrays, and automatic test equipment requiring stable component supply and long-term production continuity.

Supply support for ADS8332IPWR 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 precision data converters and industrial signal chain solutions.

The ADS833x family was designed specifically for low-power, high-accuracy multichannel data acquisition in space- and energy-constrained industrial and medical systems-emphasizing flexible supply operation, robust serial interfacing, and thermal efficiency in compact packages.

FAQ

What is the maximum SCLK frequency supported by ADS8332IPWR at 2.7 V supply?

The ADS8332IPWR supports up to 25 MHz SCLK when used solely as an I/O clock at VA = 2.7 V and VBD = 1.65 V. When SCLK also serves as the conversion clock, the maximum usable frequency drops to 21 MHz. These limits ensure setup/hold timing margins per Section 8.7 of the SBAS363E datasheet and maintain reliable communication with host processors such as MSP430 or STM32L4 series.

Does ADS8332IPWR support true differential input operation?

No, ADS8332IPWR does not support true differential input. It is a unipolar-input ADC with an 8:1 single-ended multiplexer. Inputs are referenced to COM (typically AGND), and full-scale range is defined as IN[x] – COM = 0 to VREF. For differential measurements, external instrumentation amplifiers or resistor networks must condition signals prior to connection to IN[0:7].

How is the thermal pad on the ADS8332IPWR VQFN package intended to be connected?

The exposed thermal pad on the ADS8332IPWR (RGE package) must be soldered to a solid analog ground plane on the PCB using a thermal via array. Texas Instruments specifies this connection in Section 7 of SBAS363E to ensure proper heat dissipation and minimize junction-to-board thermal resistance (ψJB = 8.7°C/W). Leaving the pad floating or connecting it to DGND degrades thermal performance and may cause INL drift.

Can ADS8332IPWR operate with a 1.8-V digital I/O supply?

Yes, ADS8332IPWR supports VBD as low as 1.65 V, making it compatible with 1.8-V digital interfaces. VIH(min) is specified as 0.65 × VBD (1.17 V) and VOL(max) as 0.4 V at IO = –100 μA, ensuring reliable logic-level compatibility with 1.8-V MCUs without level shifters-provided VA remains ≥2.7 V and VBD ≤ VA + 0.2 V.

What is the purpose of the MUXOUT pin on ADS8332IPWR?

MUXOUT provides access to the internal multiplexer output stage, allowing external signal conditioning (e.g., filtering, attenuation, or gain) between the mux and ADCIN. This breakout capability enables custom channel-specific analog processing-such as anti-aliasing filtering per sensor type-without requiring separate op-amp stages for each IN[0:7] input, reducing component count and board area in multi-sensor systems.