Texas Instruments ADS8515IBDBRG4

Overview

ADS8515IBDBRG4 from Texas Instruments is a 16-bit, 250-kSPS successive approximation register (SAR) analog-to-digital converter with ±10 V input range, internal 4.096 V reference, and full parallel 16-bit twos-complement output. It operates from a single +5 V analog supply and supports flexible I/O voltage (1.65–5.25 V), enabling direct interfacing with 3.3 V or 5 V microprocessors in industrial data acquisition systems.

For engineers reviewing the ADS8515IBDBRG4 datasheet, ADS8515IBDBRG4 pinout, ADS8515IBDBRG4 application, or ADS8515IBDBRG4 equivalent, key selection considerations include its guaranteed no-missing-codes performance, ±2 LSB max INL over –40°C to +85°C, SSOP-28 package compatibility, and support for both internal and external reference configurations.

Technical Context

The ADS8515IBDBRG4 implements a capacitor-based SAR architecture with integrated sample-and-hold, precision resistor network for ±10 V scaling, and three-state parallel output drivers. Its control logic accepts asynchronous R/C and CS inputs to initiate conversion and enable data readout, with BUSY signaling completion.

It features dual reference operation: internal 4.096 V bandgap reference (±8 ppm/°C drift, 4.076–4.116 V range) or external 3.9–4.2 V reference. The CAP pin delivers buffered reference output requiring a 2.2 µF tantalum capacitor with ESR < 3 Ω for stable CDAC switching current delivery.

Key Specifications

Pinout & Package

ADS8515IBDBRG4 is housed in a 28-pin SSOP (DB) package with 0.64 mm pitch, optimized for thermal performance (Θ_JA = 67°C/W) and board-level noise immunity via dedicated AGND1, AGND2, and DGND pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8505IBDBRG4 and AD7606BSTZ, the ADS8515IBDBRG4 offers the lowest system-level integration complexity for single-channel, parallel-interface industrial DAQ-requiring no serialization/deserialization logic, no channel multiplexing arbitration, and minimal firmware overhead while maintaining guaranteed monotonicity and industrial temperature compliance.

Availability

ADS8515IBDBRG4 is available at Aetrix Electronics and suitable for industrial process control, data acquisition systems, and medical equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for ADS8515IBDBRG4 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 ADS8515IBDBRG4 belongs to TI's high-accuracy SAR ADC product line, engineered specifically for industrial and instrumentation applications demanding guaranteed monotonicity, wide input range, and robust operation across extended temperature ranges.

FAQ

What is the maximum sampling rate supported by the ADS8515IBDBRG4?

The ADS8515IBDBRG4 supports a maximum throughput rate of 250 kSPS, corresponding to a fixed 4 µs conversion cycle time (acquisition + conversion). This rate is fully specified over the industrial temperature range (–40°C to +85°C) and does not require derating. The device achieves this performance using an integrated capacitor-based SAR architecture with on-chip sample-and-hold and reference circuitry, making ADS8515IBDBRG4 suitable for real-time control and medium-speed data logging applications.

Does the ADS8515IBDBRG4 require an external reference voltage?

No, the ADS8515IBDBRG4 includes a precision internal 4.096 V reference with ±0.2% initial accuracy (4.076–4.116 V) and ±8 ppm/°C drift, sufficient for most industrial applications. An external reference (3.9–4.2 V) may be applied to the REF pin to bypass the internal reference and improve system-level accuracy or enable shared reference architectures. The internal reference eliminates BOM cost and layout complexity, while the external option supports tighter calibration requirements in metrology-grade instruments using ADS8515IBDBRG4.

How is the parallel data output of the ADS8515IBDBRG4 controlled?

The ADS8515IBDBRG4 uses two control inputs-CS (chip select) and R/C (read/convert)-to manage its 16-bit three-state parallel bus. When CS is low and R/C transitions high, the full 16-bit result (D15–D0) becomes active on the bus. The BYTE pin allows byte-wise access: low for D15–D8 (MSB), high for D7–D0 (LSB). BUSY going high indicates data validity, enabling synchronous latching. This flexible control scheme lets ADS8515IBDBRG4 interface directly with 8-bit or 16-bit microcontrollers without glue logic.

What are the grounding requirements for optimal performance of the ADS8515IBDBRG4?

The ADS8515IBDBRG4 has three dedicated ground pins: AGND1 (analog signal reference), AGND2 (analog supply return), and DGND (digital supply return). For optimal performance, all three must connect to a single-point analog ground plane-separate from the system's digital logic ground-and tie to system ground near the power supplies. AGND1 requires the lowest-impedance path, as it references VIN. Separating AGND2 and DGND prevents digital switching noise from modulating the analog reference, preserving the ADS8515IBDBRG4's 90 dB SNR and ±2 LSB INL specifications.

Can the ADS8515IBDBRG4 operate from a single 5 V supply?

Yes, the ADS8515IBDBRG4 is designed to operate from a single +5 V analog supply (VANA = +4.75 V to +5.25 V), with VDIG optionally tied to VANA or set independently between +1.65 V and +5.25 V. Its CMOS SAR architecture consumes only 100 mW typical at 250 kSPS, enabling efficient single-rail operation. This simplifies power design in space-constrained industrial modules and eliminates the need for dual ±15 V supplies traditionally required by older 16-bit converters-making ADS8515IBDBRG4 ideal for modern, low-power, single-supply DAQ systems.