ADS8691IPW

Analog To Digital Converters (ADC) Overview

The ADS8691IPW is an 18-bit, high-speed, single-supply Successive Approximation Register (SAR) Analog-to-Digital Converter (ADC) manufactured by Texas Instruments. It features a single-channel input with a sampling rate of 1 MSPS and operates on a 5 V analog supply (4.75 V to 5.25 V) and a flexible digital supply (1.65 V to 5.25 V). The device utilizes a serial peripheral interface (SPI) for communication and includes an internal oscillator. Key performance metrics include a signal-to-noise ratio (SNR) of 92.5 dB, differential nonlinearity (DNL) of 0.6 LSB, integral nonlinearity (INL) of 2 LSB, and a gain error of 0.01% FSR. It consumes 42 mW of power and functions within a temperature range of -40°C to +125°C in a TSSOP-16 package.

Analog To Digital Converters (ADC) Feature Summary

• Integrated programmable gain amplifier (PGA) supporting bipolar input ranges.
• Built-in over-voltage protection for enhanced robustness.
• Internal oscillator eliminates the need for external clock sources.
• Flexible dual-supply architecture allowing independent analog and digital voltage levels.

Analog To Digital Converters (ADC) Applications

• High-precision data acquisition systems requiring 18-bit resolution.
• Industrial process control and monitoring applications.
• Medical instrumentation and diagnostic equipment.
• Test and measurement instruments.

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix to confirm the packaging type, as 'IPW' denotes a tube package while other suffixes may indicate tape-and-reel options. Ensure compatibility with the required operating temperature range and supply voltages. Confirm that the pinout matches the TSSOP-16 footprint. Check for any recent revisions to the datasheet that might affect electrical characteristics or application notes.

Analog To Digital Converters (ADC) Selection Notes

Select this component when 18-bit resolution and 1 MSPS speed are required for single-ended inputs. Consider the internal PGA if variable input ranges are needed without external amplifiers. Evaluate the power consumption against system constraints, noting the 42 mW typical draw. Ensure the host microcontroller supports the SPI interface timing requirements. Compare SNR and linearity specifications against other SAR ADCs if noise performance is critical.

Analog To Digital Converters (ADC) Part Context

The ADS8691 belongs to the ADS869x family of 18-bit SAR ADCs from Texas Instruments. This series is designed for high-performance data acquisition applications. Other members of the family may offer different channel counts or input configurations. The IPW variant specifically refers to the plastic small-outline wide package with a thermal pad, suitable for surface-mount assembly.

Analog To Digital Converters (ADC) Replacement Considerations

ADS8691IPWR: Same functional device but in tape-and-reel packaging instead of tubes. ADS8691IPWRG4: RoHS-compliant version of the reel-packaged device. ADS8681: Lower resolution (16-bit) alternative in the same family. ADS8671: 14-bit resolution option. Verify pinout and register compatibility before substituting.