Texas Instruments ADS8327IPWR

Overview

ADS8327IPWR from Texas Instruments is a 16-bit, 500-kSPS unipolar-input SAR analog-to-digital converter with built-in conversion clock, SPI/DSP-compatible serial interface, and ±2 LSB max INL. It operates from 2.7 V to 5.5 V analog supply and delivers 91 dB SNR at 10 kHz for precision data acquisition in industrial process control systems.

For engineers reviewing the ADS8327IPWR datasheet, ADS8327IPWR pinout, ADS8327IPWR application, or ADS8327IPWR equivalent, key selection criteria include unipolar input range (0 V to VREF), deep power-down mode (2–50 nA), daisy-chain capability, EOC/INT programmability, and TSSOP-16 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The ADS8327IPWR implements a capacitor-based successive approximation register (SAR) architecture with integrated sample-and-hold, enabling single-shot or auto-triggered conversions. Its internal 10.5–12.2 MHz conversion clock eliminates external timing components while supporting up to 50 MHz SCLK for high-speed serial readout.

It features dual power domains (+VA for analog, +VBD for I/O), programmable EOC/INT polarity and duration, global CONVST independent of CS, and chain-mode operation via CDI/SDO routing-enabling synchronized multi-channel sampling without host controller coordination.

Key Specifications

Pinout & Package

ADS8327IPWR is housed in a 16-pin TSSOP (PW) package with exposed thermal pad internally connected to substrate. Pin 1 is +VA; pins 5 and 15 are AGND and BDGND respectively; pin 10 is EOC/INT/CDI (programmable status output); pin 11 is FS/CS (SPI frame sync/chip select); pin 16 is +VBD.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8328IPWR, ADS8327IPWR provides dedicated single-input simplicity and lower system-level complexity; versus AD7682BCPZ-RL7, it delivers 2× higher throughput, integrated clocking, and native daisy-chain capability-critical for scalable multi-channel systems.

Availability

ADS8327IPWR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and data acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for ADS8327IPWR 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, embedded processing, and connectivity technologies with over 50 years of innovation in precision data converters.

The ADS8327IPWR belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and robust industrial data acquisition where DC accuracy and AC performance must coexist under wide temperature and supply variations.

FAQ

What is the maximum external SCLK frequency supported by the ADS8327IPWR?

The ADS8327IPWR supports an external SCLK frequency up to 50 MHz when used solely as an I/O clock. When SCLK also serves as the conversion clock, the maximum is 21 MHz. These limits ensure setup/hold timing margins are met across –40°C to +85°C, with typical tSU(SDI-SCLKF) = 8 ns and th(SDI-SCLKF) = 4 ns. The ADS8327IPWR maintains reliable serial communication within these bounds without requiring additional timing guard bands.

Does the ADS8327IPWR require an external reference voltage source?

Yes, the ADS8327IPWR requires an external reference voltage applied between REF+ (Pin 7) and REF– (Pin 6). It accepts VREF from 0.3 V to 4.2 V (for +VA ≥ 2.7 V) or up to 4.2 V (for +VA ≥ 4.5 V), with optimal performance at 2.5 V or 4.096 V. The device does not include an internal reference; reference accuracy and noise directly determine overall system gain error and SNR. The ADS8327IPWR's 80 kΩ reference input resistance simplifies driving with precision voltage references like REF5025 or ADR45xx.

How does the ADS8327IPWR handle power-down modes, and what are their current draw values?

The ADS8327IPWR offers three power-down states: Deep Power-Down (2–50 nA), Nap Power-Down (0.2–0.4 µA), and Auto Nap Power-Down (0.3–0.5 µA). Deep Power-Down disables all circuitry except wake-up logic, enabling longest battery life; Nap modes retain register state and allow faster wake-up (sub-microsecond). All modes are controlled via SPI command or hardware pin assertion. The ADS8327IPWR's deep power-down current is specified down to 2 nA at +VA = 2.7 V, making it suitable for energy-harvesting sensor nodes.

Can the ADS8327IPWR operate with separate analog and digital supply voltages?

Yes, the ADS8327IPWR uses independent supply domains: +VA (2.7–5.5 V) powers the analog core including SAR, reference buffer, and comparator; +VBD (1.65 V to 1.5×+VA) powers digital I/O buffers. This separation suppresses digital switching noise from corrupting analog measurements. BDGND (Pin 14) must be isolated from AGND (Pin 5) except at a single-point star ground. The ADS8327IPWR's PSRR of 78 dB at FFFFh output code confirms effective rejection of supply ripple on +VA.

Is the ADS8327IPWR pin-compatible with other devices in the ADS832x family?

The ADS8327IPWR shares the same 16-pin TSSOP (PW) and 4×4 QFN (RSA) footprints with ADS8328IPWR, but pin functions differ: ADS8327IPWR uses Pin 2 as RESERVED (connect to AGND or +VA), whereas ADS8328IPWR assigns Pin 2 to +IN1. ADS8327IPWR has no channel multiplexer; thus, +IN0/+IN1 and COM pins are absent. Direct replacement is not possible without PCB revision. The ADS8327IPWR's Pin 3 (+IN) and Pin 4 (–IN) map identically across both packages, preserving analog input layout reuse.