Texas Instruments ADS8517IBDW

Overview

ADS8517IBDW 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 input ranges, parallel/serial interface, and industrial –40°C to +85°C operation. It delivers ±1.5 LSB max INL, 88.8-dB SINAD at 10 kHz, and 47 mW typical power at full throughput - used in portable test equipment, medical instrumentation, and industrial process control systems.

For engineers reviewing the ADS8517IBDW datasheet, ADS8517IBDW pinout, ADS8517IBDW application, or ADS8517IBDW equivalent, key selection criteria include its dual-interface flexibility (parallel BYTE-selectable or SPI-compatible serial), internal reference accuracy (±0.75% full-scale error), bipolar/unipolar zero-error drift (±0.6 ppm/°C and ±0.15 ppm/°C), and SO-28 package compatibility with ADS7807/ADS8507.

Technical Context

The ADS8517IBDW implements a capacitor-based SAR architecture with integrated sample-and-hold, clock generator, and reference buffer. Its analog front-end supports configurable input ranges (±10 V, 0–5 V, 0–4 V) via external resistor networks and tolerates ±25 V fault conditions without damage.

Digital interface operation is governed by dual control modes: parallel output uses BYTE-selectable 8-bit nibbles with BUSY-synchronized latching, while serial mode supports both internal clock (16-pulse DATACLK burst per conversion) and external clock (daisy-chain TAG-enabled) with SB/BTC format selection and MSB-first transmission.

Key Specifications

Pinout & Package

ADS8517IBDW is housed in a 28-pin SOIC (SO-28) package with 0.6 mm lead pitch and 17.9 mm × 7.5 mm body size, compatible with standard surface-mount assembly processes and thermal impedance of 46°C/W (θ_JA).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8507IBDW and ADS7807UB, the ADS8517IBDW offers superior DC accuracy (±1.5 LSB INL vs. ±3 LSB), integrated reference (reducing component count), and higher throughput (200 kSPS vs. 100 kSPS), making it optimal for new precision instrumentation designs requiring minimal external components.

Availability

ADS8517IBDW is available at Aetrix Electronics and suitable for portable test equipment, medical instrumentation, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS8517IBDW 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 broad industrial and automotive portfolio coverage.

The ADS8517IBDW belongs to TI's precision data acquisition product line, engineered for high-accuracy, low-power, multi-interface ADC applications in portable and harsh-environment instrumentation.

FAQ

What input voltage ranges does the ADS8517IBDW support, and how are they configured?

The ADS8517IBDW supports ±10 V, 0–5 V, and 0–4 V input ranges. Configuration is achieved using external resistors per Table 1 in the datasheet: ±10 V connects R1IN to VIN and R2IN to CAP; 0–5 V ties R1IN to AGND and R2IN to VIN; 0–4 V connects both inputs to VIN. Each configuration sets distinct input impedance (45.7 kΩ, 20.0 kΩ, 21.4 kΩ) and requires no software changes. The ADS8517IBDW tolerates ±25 V on R1IN/R2IN without damage.

Does the ADS8517IBDW require an external reference, or can it operate with its internal reference?

The ADS8517IBDW operates fully with its internal 2.5-V reference, eliminating external reference components. When REFD is low, the internal reference is enabled and must be bypassed with a 2.2-µF tantalum capacitor on the CAP pin. An external 2.3–2.7 V reference may be used instead by driving the REF pin and setting REFD high, but the ADS8517IBDW's internal reference delivers ±0.75% full-scale accuracy and ±0.6 ppm/°C drift - sufficient for most precision applications without added BOM cost.

How does the parallel/serial interface selection work on the ADS8517IBDW?

The ADS8517IBDW supports simultaneous parallel and serial interfaces. Parallel operation uses D0–D7 pins with BYTE pin selecting MSB (BYTE = low) or LSB (BYTE = high) byte; BUSY rising edge indicates data validity. Serial operation uses SDATA and DATACLK, controlled by EXT/INT: when EXT/INT = low, DATACLK outputs 16 pulses per conversion; when EXT/INT = high, DATACLK serves as external clock input. Both modes coexist - the ADS8517IBDW outputs data on both interfaces concurrently unless disabled via control logic.

What is the power consumption profile of the ADS8517IBDW at maximum sampling rate?

At 200 kSPS with VANA = VDIG = 5 V and internal reference enabled, the ADS8517IBDW consumes 47 mW typical (60 mW max). In power-down mode (PWRD = high), consumption drops to 50 µW max. The 47 mW figure includes ADC core (9 mA), interface (0.3 mA), and reference buffer (1 mA) currents - verified across –40°C to +85°C. This low active power enables use in battery-powered portable test equipment where the ADS8517IBDW sustains full performance without thermal derating.

Is the ADS8517IBDW pin-compatible with other devices in the ADS85xx family?

Yes, the ADS8517IBDW is pin-compatible with the 16-bit ADS7807 and ADS8507, as well as the 12-bit ADS7806 and ADS8506 - all in SO-28 and TSSOP-28 packages. Pin assignments for power, ground, analog inputs, reference, and digital interface signals match exactly. This allows direct substitution in existing layouts when upgrading resolution or accuracy, provided firmware accounts for differences in INL (±1.5 LSB vs. ±3 LSB), throughput (200 kSPS vs. 100 kSPS), and reference configuration. The ADS8517IBDW maintains identical mechanical and thermal footprints.