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ADS8691IPW
Texas Instruments
IC ADC 18BIT SAR 16TSSOP
65901 Pcs New Original In Stock
18 Bit Analog to Digital Converter 1 Input 1 SAR 16-TSSOP
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5.0 / 5.0
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ADS8691IPW
Product Overview
1273937
DiGi Electronics Part Number
ADS8691IPW-DGManufacturer
Texas Instruments
ADS8691IPW
Description
IC ADC 18BIT SAR 16TSSOPInventory
65901 Pcs New Original In Stock
18 Bit Analog to Digital Converter 1 Input 1 SAR 16-TSSOP
Quantity
Minimum 1
Minimum 1
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ADS8691IPW Technical Specifications
Category
Data Acquisition, Analog to Digital Converters (ADC)
Packaging
Tube
Series
ADS869x
Product Status
Active
Number of Bits
18
Sampling Rate (Per Second)
1M
Number of Inputs
1
Input Type
Differential, Pseudo-Differential, Single Ended
Data Interface
SPI
Configuration
PGA-ADC
Ratio - S/H:ADC
0:1
Number of A/D Converters
1
Architecture
SAR
Reference Type
Internal
Voltage - Supply, Analog
4.75V ~ 5.25V
Voltage - Supply, Digital
1.65V ~ 3.3V
Features
Internal Oscillator
Operating Temperature
-40°C ~ 125°C
Package / Case
16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package
16-TSSOP
Mounting Type
Surface Mount
Base Product Number
ADS8691
Datasheet & Documents
Manufacturer Product Page
ADS8691IPW Specifications
HTML Datasheet
ADS8691IPW-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-45448-5
Standard Package
90
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
소프트웨어 지원과 물류 진행이 매우 체계적이어서 믿음이 갑니다.
de desembre 02, 2025
La sécurité de l’emballage chez DiGi Electronics est exceptionnelle, garantissant que tout arrive en parfait état. Leurs prix sont avantageux, ce qui m’incite à acheter fréquemment.
de desembre 02, 2025
I am very impressed with the quality of the products; they are durable and reliable, exceeding my expectations.
de desembre 02, 2025
Customer service team followed up to ensure my issue was fully resolved.
de desembre 02, 2025
The support team provided comprehensive troubleshooting guidance that resolved our issues swiftly.
de desembre 02, 2025
Excellent shipping speed and customer support keep me coming back.
de desembre 02, 2025
Always pleased with how promptly and carefully my orders arrive.
de desembre 02, 2025
Their pricing strategies and support services are top-notch.
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Frequently Asked Questions (FAQ)
When designing a high-precision system with the ADS8691IPW, what are the key considerations for selecting a suitable analog power supply to avoid noise injection and ensure the 18-bit resolution is fully realized?
For optimal performance of the ADS8691IPW, it's critical to provide a clean analog supply. Use a low-noise linear regulator with excellent Power Supply Rejection Ratio (PSRR) for the 4.75V to 5.25V analog voltage. Decouple the ADS8691IPW's analog pins with multiple ceramic capacitors (e.g., 10µF and 0.1µF) placed as close to the device pins as possible. Consider adding a ferrite bead in series with the analog supply to further attenuate high-frequency noise, especially if the power supply is located remotely from the ADC. This proactive approach mitigates the risk of noise coupling into the sensitive analog front-end, safeguarding the full 18-bit accuracy.
I'm considering replacing an older SAR ADC, like the ADS8591, with the ADS8691IPW for a 1M sample/sec application. What are the potential integration challenges and performance trade-offs I should anticipate with the ADS8691IPW's SPI interface and internal PGA?
Transitioning from an ADS8591 to the ADS8691IPW involves key considerations. The ADS8691IPW utilizes an SPI interface, which requires careful timing analysis to achieve its 1M sample/sec rate, especially if the host microcontroller's SPI clock speed is a limiting factor. Unlike some standalone ADCs, the ADS8691IPW features an integrated PGA, offering flexibility but also introducing potential gain error and offset drift that must be calibrated out for true 18-bit accuracy. Ensure your firmware handles the SPI protocol correctly, including clock polarity and phase, and implement appropriate calibration routines to compensate for the PGA's characteristics, minimizing the risk of inaccurate readings.
For applications demanding robust performance across a wide temperature range, how does the ADS8691IPW's operational temperature specification of -40°C to 125°C impact its long-term reliability and accuracy compared to commercial-grade ADCs?
The ADS8691IPW's industrial operating temperature range of -40°C to 125°C signifies it's designed for harsher environments than typical commercial-grade ADCs. This wide range implies the internal components, including the internal oscillator and SAR architecture, are selected and tested to maintain their electrical characteristics and performance (including linearity and accuracy) within these extremes. While this significantly enhances reliability in demanding applications, it's still prudent to perform system-level temperature cycling and drift analysis within your specific operating profile to confirm long-term stability and validate that any subtle shifts in parameters do not compromise critical measurement accuracy.
I need to interface the ADS8691IPW with a low-voltage digital system (e.g., 1.8V logic). What are the critical configuration and signal integrity considerations when connecting the digital supply of the ADS8691IPW (1.65V-3.3V) to ensure reliable SPI communication?
Interfacing the ADS8691IPW with a 1.8V logic system requires attention to its digital supply range of 1.65V to 3.3V. While 1.8V is within this range, ensure your digital voltage source is stable and well-regulated. Crucially, ensure that the SPI data lines (SDI, SDO, SCLK) are compatible with both the ADS8691IPW's digital logic levels at 1.8V and your microcontroller's 1.8V I/O. Employ level shifting if necessary, although direct compatibility is often possible within this range. Additionally, maintain short trace lengths and proper signal routing for the SPI bus to prevent reflections and ensure data integrity at the 1M sample/sec rate, thereby mitigating communication errors.
In a single-ended input configuration for the ADS8691IPW, how can I best minimize common-mode noise and ground loop issues to achieve the full 18-bit resolution, especially when the signal source is not perfectly isolated?
When utilizing the ADS8691IPW in a single-ended input configuration, mitigating common-mode noise and ground loops is paramount for achieving its 18-bit precision. Employ a robust grounding strategy by connecting all grounds to a single star ground point if possible. Utilize differential signaling from the source to the ADC's pseudo-differential input if the signal source allows, even if only one input channel is actively used, as this inherently rejects common-mode noise. If strict single-ended is required, ensure the signal source's ground is as close as practically possible to the ADS8691IPW's analog ground and consider using a small series resistor on the signal path followed by a bypass capacitor to ground to filter out high-frequency noise before it reaches the ADC's input. Careful PCB layout, keeping analog and digital grounds separated but connected at a single point, is also vital to minimize interference.
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ADS8691IPW CAD Models
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