Texas Instruments ADS8513IDW

Overview

ADS8513IDW 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. It serves precision industrial data acquisition systems requiring high DC accuracy and AC performance.

For engineers reviewing the ADS8513IDW datasheet, ADS8513IDW pinout, ADS8513IDW application, or ADS8513IDW equivalent, key selection criteria include its 16-bit no-missing-codes resolution, ±25V fault-tolerant analog inputs, dual-clock mode (internal/external DATACLK), 3-stated bus for multi-chip S/H synchronization, and SO-16 package compatibility with ADS7813/ADS8512.

Technical Context

The ADS8513IDW implements a capacitor-based SAR architecture with integrated sample-and-hold, internal reference buffer (BUF), and programmable input range configuration via R1IN/R2IN/R3IN connections per Table 1. Its conversion timing is fixed at 25µs total cycle time, enabling deterministic 40kSPS throughput independent of external clock jitter when using internal DATACLK.

Digital interface operation supports master/slave SPI mode up to 20MHz, with BUSY-driven frame sync and MSB-first binary two's complement output. The EXT/INT pin selects DATACLK source without affecting internal conversion clocking, allowing decoupled timing control for system-level synchronization.

Key Specifications

Pinout & Package

ADS8513IDW is housed in a 16-pin SOIC (SO-16, DW package) with standard 1.27mm pitch. Pin 1 is VS (5V analog supply); pins 2 and 8 are GND; pin 16 is VS (shared supply). All digital I/Os are 5V-tolerant with defined VIH/VIL thresholds.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8513IDW, ADS8512IDW trades 4 bits of resolution for lower cost and reduced signal chain complexity, while ADS7813UB increases design effort with external reference dependency and no fault protection-making ADS8513IDW optimal for new high-accuracy, robust industrial DAQ designs.

Availability

ADS8513IDW is available at Aetrix Electronics and suitable for industrial process control, test equipment, robotics servo control, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS8513IDW 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 ADS8513 product line targets high-accuracy, low-power data acquisition in harsh environments-designed specifically for industrial automation, test instrumentation, and medical systems demanding guaranteed 16-bit performance over –40°C to +85°C.

FAQ

What input voltage ranges does the ADS8513IDW support?

The ADS8513IDW supports configurable analog input ranges including ±10V, ±5V, 0V to 10V, 0.5V to 4.5V, and ±3.33V. Range selection is achieved by connecting R1IN, R2IN, and R3IN to appropriate nodes (VIN, BUF, or GND) per Table 1 in the datasheet. Each configuration sets distinct input impedance-e.g., ±10V uses 45.7kΩ, while high-impedance 0.3V–2.8V mode exceeds 10MΩ.

Does the ADS8513IDW require external calibration components?

No, the ADS8513IDW requires no external calibration resistors. Its internal trimmed reference, capacitor DAC, and factory-calibrated linearity (±2LSB INL) eliminate the need for user calibration. The device achieves ±10mV bipolar zero error and 2.5ppm/°C zero drift without potentiometers or external trim networks-reducing bill-of-materials and assembly steps.

How does the EXT/INT pin affect ADS8513IDW operation?

The EXT/INT pin configures DATACLK functionality: when low, DATACLK outputs an internal 20MHz-capable synchronous clock for serial data; when high, DATACLK becomes an input requiring external clocking. Critically, EXT/INT has no effect on the internal conversion clock-ensuring consistent 40kSPS timing regardless of serial interface mode. This allows independent optimization of acquisition and data transfer timing.

What is the purpose of the BUF and CAP pins on the ADS8513IDW?

BUF is the output of the internal reference buffer, used to drive R1IN/R2IN/R3IN reference nodes for range configuration. CAP is the buffer's compensation node and must be decoupled to GND with a 1µF tantalum capacitor in parallel with a 0.01µF ceramic capacitor. This dual-capacitor network stabilizes the buffer, preventing oscillation and ensuring accurate reference delivery across temperature and load variations.

Can multiple ADS8513IDW devices share a common CONV signal?

Yes, the ADS8513IDW supports global CONV triggering for simultaneous sampling across multiple units. When CONV falls, all devices enter hold mode and begin conversion concurrently. Their BUSY outputs remain active until completion, and DATA lines can be individually enabled via separate CS signals-enabling synchronized multi-channel acquisition with sub-microsecond inter-device skew in systems like multi-axis motion controllers.