Texas Instruments ADS8327IBPWR

Overview

ADS8327IBPWR from Texas Instruments is a 16-bit, 500-kSPS unipolar-input SAR analog-to-digital converter with integrated sample-and-hold, internal conversion clock, and SPI/DSP-compatible serial interface. It delivers ±1 LSB max DNL, ±1.5 LSB max INL, 91 dB SNR at 10 kHz, and operates from 2.7 V to 5.5 V analog supply. It is used in high-precision transducer interface and medical instrument signal chains where low power and DC accuracy are critical.

For engineers reviewing the ADS8327IBPWR datasheet, ADS8327IBPWR pinout, ADS8327IBPWR application, or ADS8327IBPWR equivalent, key selection factors include unipolar input range (0 V to VREF), deep power-down mode (2–50 nA), 4×4 QFN-16 package thermal performance, and daisy-chain capability for multi-channel data acquisition systems.

Technical Context

The ADS8327IBPWR implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, eliminating external hold circuitry. Its conversion logic uses an internal 10.5–12.2 MHz CCLK derived from SCLK or independent oscillator, enabling deterministic 18-cycle conversion time (18 CCLK) and 3-CCLK acquisition window.

It supports both manual and auto-triggered conversion modes via CONVST, with programmable EOC/INT polarity and status output. The serial interface operates up to 50 MHz SCLK in SPI/DSP modes and enables multi-device daisy chaining using CDI/SDO routing without additional control lines.

Key Specifications

Pinout & Package

ADS8327IBPWR is housed in a 4×4 mm, 16-pin QFN package (RSA) with exposed thermal pad internally connected to substrate. Pin 1 is REF+ (REFIN); pins 15 and 16 are SCLK and +VBD respectively; AGND (pin 15 in TSSOP, pin 15 in QFN) and BDGND (pin 8) are separate analog/digital ground references requiring split-plane layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8327IPWR, the ADS8327IBPWR guarantees tighter DC specs (±1.5 LSB INL) and 16-bit NMC over temperature, while AD7682BCPZ-RL7 trades throughput and integration for broader vendor support and legacy design reuse-making ADS8327IBPWR optimal for new high-precision, low-power, multi-node systems.

Availability

ADS8327IBPWR is available at Aetrix Electronics and suitable for medical instrumentation, industrial process control, and data acquisition systems requiring stable component supply, long-term lifecycle assurance, and guaranteed parametric performance across –40°C to +85°C.

Supply support for ADS8327IBPWR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The ADS8327 belongs to TI's precision data converter portfolio, designed specifically for high-resolution, low-power, serial-output SAR ADC applications in portable and distributed sensing systems.

FAQ

What is the maximum sampling rate supported by the ADS8327IBPWR?

The ADS8327IBPWR supports a fixed maximum sampling rate of 500 kSPS, achieved through its internal 10.5–12.2 MHz conversion clock and deterministic 18-cycle conversion time. This rate is maintained across the full operating temperature range (–40°C to +85°C) and supply voltages (2.7 V to 5.5 V), with no performance derating required for sustained operation. The ADS8327IBPWR does not support oversampling or variable-rate modes.

Does the ADS8327IBPWR require an external reference voltage?

Yes, the ADS8327IBPWR requires an external reference voltage applied between REF+ and REF− pins. It accepts reference ranges 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 typical use cases employing 2.5 V or 4.096 V precision references. The device does not include an internal reference; REF− must be connected directly to AGND via a dedicated via to maintain specified INL and offset accuracy. The ADS8327IBPWR reference input resistance is 80 kΩ, ±30%.

How does the power-down functionality work on the ADS8327IBPWR?

The ADS8327IBPWR offers three power-down states: Deep Power-Down (2–50 nA), Nap Power-Down (0.2–0.4 µA), and Auto-Nap (automatic entry after conversion). These modes are controlled via SPI command writes to configuration registers-no hardware pin assertion is needed. In Deep Power-Down, the internal oscillator and analog circuitry are fully disabled; wake-up time is <1 µs. The ADS8327IBPWR maintains register state across all modes, enabling rapid resumption of sampling without reconfiguration.

Can the ADS8327IBPWR operate in daisy-chain mode with other ADCs?

Yes, the ADS8327IBPWR supports multi-device daisy-chain operation using its EOC/INT/CDI pin as chain data input and SDO as chain data output. In this mode, a single SCLK/CS/SDI bus controls up to N devices, with each ADC shifting out its 16-bit result sequentially on SDO-enabling synchronized sampling and reduced GPIO usage. The ADS8327IBPWR requires no external logic or timing adjustments; propagation delay between devices is specified at 25 ns (10-pF load) for reliable chain timing.

What are the grounding requirements for optimal performance of the ADS8327IBPWR?

Optimal ADS8327IBPWR performance requires strict separation of AGND (analog ground, pin 15) and BDGND (interface ground, pin 8), with separate PCB ground planes connected at a single point near the device. REF− must route directly to AGND via a dedicated via-not shared with power or digital return paths-to prevent common-impedance errors. The exposed thermal pad is internally tied to substrate and should be connected to AGND (not BDGND) or left floating; mixing analog and digital grounds on the pad degrades PSRR and increases INL error beyond ±1.5 LSB.