Texas Instruments ADS8513IBDWR

Overview

ADS8513IBDWR from Texas Instruments is a 16-bit, 40kSPS successive approximation register (SAR) analog-to-digital converter with internal 2.5V reference, ±10V input range capability, and SPI-compatible serial/parallel interface. It delivers 89dB SNR at 10kHz, ±2LSB max INL, and operates from a single 5V supply consuming 24mW typical power - deployed in industrial process control and portable data acquisition systems.

For engineers reviewing the ADS8513IBDWR datasheet, ADS8513IBDWR pinout, ADS8513IBDWR application, or ADS8513IBDWR equivalent, key selection criteria include its bipolar/unipolar configurable input ranges (±10V, ±5V, 0–10V), 20µs conversion time, 3-stated bus for multi-chip S/H synchronization, and SO-16 package compatibility with ADS7813/ADS8512.

Technical Context

The ADS8513IBDWR implements a capacitor-based SAR architecture with integrated sample-and-hold, internal clock generator, and programmable reference source (internal 2.5V ±0.02V or external 2.3–2.7V). Its three analog inputs (R1IN/R2IN/R3IN) support flexible range configuration via external resistor networks per Table 1, enabling ±10V, ±5V, 0–10V, 0.5–4.5V, and ±3.33V operation.

Digital interface supports master/slave SPI mode up to 20MHz with dual-clock options: internal DATACLK (EXT/INT = low) or external clock (EXT/INT = high). BUSY signal provides cycle timing, CONV initiates acquisition independently of CS, and PWRD enables 50µW power-down mode with 300µs recovery to rated accuracy.

Key Specifications

Pinout & Package

ADS8513IBDWR is housed in a 16-pin SOIC (SO-16, DW package) with standard 1.27mm pitch, RoHS-compliant lead finish, and thermal resistance θ_JA = 46°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-to-digital conversion applications.

Compared with ADS8512IBDWR and ADS7813UBDWR, the ADS8513IBDWR uniquely integrates internal 2.5V reference, seven programmable input ranges, and simultaneous multi-chip sampling - making it optimal for space-constrained, multi-range industrial DAQ where 16-bit fidelity and system-level synchronization are mandatory.

Availability

ADS8513IBDWR is available at Aetrix Electronics and suitable for industrial process control, test equipment, robotics, and medical instrumentation requiring stable component supply and long-term production continuity.

Supply support for ADS8513IBDWR 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 ICs.

The ADS8513IBDWR belongs to TI's precision SAR ADC product line, engineered specifically for high-accuracy, low-power industrial data acquisition where configurability, robustness, and single-supply operation are essential.

FAQ

What input voltage ranges does the ADS8513IBDWR support?

The ADS8513IBDWR supports seven configurable analog input ranges: ±10V, ±5V, 0–10V, 0.5–4.5V, ±3.33V, and high-impedance 0.3–2.8V mode. Range selection is achieved by connecting R1IN, R2IN, and R3IN to GND, BUF, or VIN per Table 1 in the datasheet - no external op-amps or level shifters required. Each range maintains full 16-bit performance and specified INL/SNR.

How does the ADS8513IBDWR handle power-down mode?

The ADS8513IBDWR enters ultra-low-power mode (50µW typical) when PWRD is driven high. Recovery to full accuracy requires 300µs after PWRD returns low, during which internal references and bias circuits stabilize. Unlike earlier TI converters, ADS8513IBDWR does not require CONV to be low before asserting PWRD - simplifying power sequencing in battery-operated systems.

Is the ADS8513IBDWR pin-compatible with other TI ADCs?

Yes, the ADS8513IBDWR is pin-compatible with the 16-bit ADS7813 and 12-bit ADS7812/ADS8512 in SO-16 (DW) package. This allows drop-in replacement for resolution upgrades or cost-optimized variants while retaining identical PCB layout, decoupling, and interface wiring - provided software handles the differing resolution and feature sets.

What is the role of the BUF and CAP pins on the ADS8513IBDWR?

BUF is the reference buffer output, used to drive R1IN/R2IN/R3IN nodes for range configuration or to provide high-impedance input mode (>10MΩ). CAP is the reference compensation node, requiring a 1µF tantalum + 0.01µF ceramic capacitor to ground to stabilize the internal 2.5V reference - omitting this causes reference ripple and degraded AC performance such as reduced SINAD.

Can the ADS8513IBDWR interface with standard SPI controllers?

Yes, the ADS8513IBDWR features an SPI-compatible serial interface supporting master/slave operation up to 20MHz. It outputs 16-bit binary two's complement data MSB-first on the DATA pin, synchronized to DATACLK. When EXT/INT = low, DATACLK is generated internally; when EXT/INT = high, an external clock must be supplied - both modes comply with standard SPI timing conventions.