Texas Instruments ADS8517IBPW

Overview

ADS8517IBPW from Texas Instruments is a 16-bit, 200-kSPS successive approximation register (SAR) analog-to-digital converter with integrated 2.5-V reference, high-impedance ±10 V/0–5 V/0–4 V input ranges, parallel/serial dual interface, and ±1.5 LSB max INL. It operates from single 4.5–5.5 V analog and 1.65–5.5 V digital supplies, targeting precision data acquisition in portable test equipment and industrial process control.

For engineers reviewing the ADS8517IBPW datasheet, ADS8517IBPW pinout, ADS8517IBPW application, or ADS8517IBPW equivalent, key selection criteria include its 200-kHz throughput, internal reference accuracy (±0.75% full-scale error), bipolar zero error (±2 mV), 88.8-dB SINAD at 10 kHz, and TSSOP-28 package compatibility with ADS7807/ADS8507.

Technical Context

The ADS8517IBPW implements a capacitor-based SAR architecture with integrated sample-and-hold, internal 2.5-V reference buffer (requiring 2.2-µF tantalum bypass on CAP pin), and configurable output coding (binary twos complement or straight binary via SB/BTC pin). Its analog front-end supports ±25 V fault-tolerant inputs without damage across all ranges.

Dual-data-path operation enables simultaneous parallel (BYTE-selectable MSB/LSB bytes) and SPI-compatible serial (daisy-chain capable via TAG pin) output modes controlled by EXT/INT and CS/R/C logic. Power-down mode reduces dissipation to 50 µW while retaining previous conversion result in shift register.

Key Specifications

Pinout & Package

TSSOP-28 package (7.8 mm × 4.4 mm, 0.65 mm pitch) with exposed thermal pad; RoHS-compliant, moisture-sensitive level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7807UB and ADS8507IPWR, the ADS8517IBPW uniquely combines TSSOP-28 packaging, integrated 2.5-V reference with ±0.75% error, and 200-kSPS throughput at ±1.5 LSB INL-making it optimal for space-constrained, self-contained precision DAQ systems requiring minimal external components.

Availability

ADS8517IBPW is available at Aetrix Electronics and suitable for portable test equipment, industrial process control, and medical instrumentation requiring stable component supply with guaranteed long-term sourcing.

Supply support for ADS8517IBPW 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-grade IC design.

The ADS8517IBPW belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power data acquisition in harsh environments-specifically targeting applications demanding integrated references, fault-tolerant inputs, and dual-interface flexibility.

FAQ

What input voltage ranges does the ADS8517IBPW support, and how are they configured?

The ADS8517IBPW supports ±10 V, 0–5 V, and 0–4 V analog input ranges. Configuration is achieved using external resistor networks per TI's Figure 38/39: ±10 V uses 200 Ω from R1IN to VIN and 100 Ω from R2IN to CAP; 0–5 V ties R2IN to VIN and R1IN to AGND1; 0–4 V connects both inputs to VIN. Each range sets distinct input impedance (45.7 kΩ, 20.0 kΩ, 21.4 kΩ respectively), and the ADS8517IBPW tolerates ±25 V on R1IN/R2IN without damage regardless of range.

How does the internal reference of the ADS8517IBPW affect system accuracy and calibration?

The ADS8517IBPW's internal 2.5-V reference has ±0.75% full-scale error and ±0.6 ppm/°C bipolar zero drift, directly contributing to its ±2 mV BPZ specification. This eliminates external reference components and associated layout sensitivity, but requires proper 2.2-µF tantalum decoupling on the CAP pin to maintain stability. Calibration is simplified because the ADS8517IBPW's INL (±1.5 LSB) and DNL (±1 LSB) are specified with the internal reference enabled, ensuring predictable performance without user trimming.

Can the ADS8517IBPW operate in both parallel and serial modes simultaneously, and what are the timing constraints?

Yes, the ADS8517IBPW supports concurrent parallel and serial output: parallel data appears on D0–D7 with BYTE-selectable byte order, while serial data streams on SDATA synchronized to DATACLK. However, reading serial data shifts the internal output register, so parallel reads must precede serial reads of the same conversion result. Critical timing includes 40 ns minimum R/C or CS pulse width, 5 µs minimum inter-conversion interval for full acquisition, and BUSY low duration of 5 µs (convert + acquire cycle) - all verified in the ADS8517IBPW's timing diagrams (Figures 30–36).

What is the power consumption profile of the ADS8517IBPW across operating modes?

The ADS8517IBPW consumes 47 mW typical (60 mW max) at 200 kSPS with VANA = VDIG = 5 V and internal reference enabled. In power-down mode (PWRD high), consumption drops to 50 µW max while retaining the last conversion result. Reference disable (REFD high) reduces core power further but requires an external 2.3–2.7 V reference. The device also features separate analog (VANA) and digital (VDIG) supplies, allowing independent voltage scaling (e.g., 5 V analog / 1.8 V digital) to optimize noise isolation and efficiency - all validated in the ADS8517IBPW's electrical characteristics table.

Is the ADS8517IBPW pin-compatible with other devices in Texas Instruments' ADC portfolio?

Yes, the ADS8517IBPW is explicitly pin-compatible with the 16-bit ADS7807 and ADS8507, as well as the 12-bit ADS7806 and ADS8506 - all in TSSOP-28 (PW) or SO-28 (DW) packages. This allows direct replacement in existing layouts when upgrading resolution or performance, provided system firmware accounts for differences in INL (±1.5 LSB vs ±2 LSB), SINAD (88.8 dB vs 87 dB), and reference configuration. The ADS8517IBPW maintains identical pin functions and electrical tolerances, enabling seamless migration without PCB redesign.