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ADS8689IPWR
Texas Instruments
IC ADC 16BIT SAR 16TSSOP
8073 Pcs New Original In Stock
16 Bit Analog to Digital Converter 1 Input 1 SAR 16-TSSOP
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ADS8689IPWR
Product Overview
1237291
DiGi Electronics Part Number
ADS8689IPWR-DGManufacturer
Texas Instruments
ADS8689IPWR
Description
IC ADC 16BIT SAR 16TSSOPInventory
8073 Pcs New Original In Stock
16 Bit Analog to Digital Converter 1 Input 1 SAR 16-TSSOP
Quantity
Minimum 1
Minimum 1
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ADS8689IPWR Technical Specifications
Category
Data Acquisition, Analog to Digital Converters (ADC)
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Number of Bits
16
Sampling Rate (Per Second)
100k
Number of Inputs
1
Input Type
Pseudo-Differential, Single Ended
Data Interface
SPI
Configuration
PGA-S/H-ADC
Ratio - S/H:ADC
1:1
Number of A/D Converters
1
Architecture
SAR
Reference Type
External, Internal
Voltage - Supply, Analog
5V
Voltage - Supply, Digital
1.65V ~ 5.25V
Features
PGA
Operating Temperature
-40°C ~ 125°C (TA)
Package / Case
16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package
16-TSSOP
Mounting Type
Surface Mount
Base Product Number
ADS8689
Datasheet & Documents
Manufacturer Product Page
ADS8689IPWR Specifications
HTML Datasheet
ADS8689IPWR-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
ADS8689IPWR-DG
296-48486-2
296-48486-1
296-48486-6
Standard Package
2,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Their logistics team is incredibly organized and reliable.
de desembre 02, 2025
DiGi Electronics ensures product availability, which is critical for our business continuity.
de desembre 02, 2025
Received my order in just a few days, and the product’s precise engineering and solid feel exceeded my expectations.
de desembre 02, 2025
DiGi Electronics' shipments arrive exactly when expected.
de desembre 02, 2025
My orders always arrive on time, and the shipping is handled with care.
de desembre 02, 2025
The affordability and quick logistics from DiGi Electronics make shopping a pleasure.
de desembre 02, 2025
Their prompt dispatching has helped me meet tight project deadlines on multiple occasions.
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Frequently Asked Questions (FAQ)
What are the key design risks when replacing the ADS8689IPWR with a lower-cost SAR ADC like the ADS7883 in a 16-bit precision industrial sensor interface, and how can signal integrity be preserved?
Replacing the ADS8689IPWR with the 12-bit ADS7883 introduces significant resolution and dynamic range loss, making it unsuitable for applications requiring true 16-bit performance such as high-accuracy strain gauge or RTD measurements. The ADS8689IPWR includes an integrated PGA and sample-and-hold optimized for pseudo-differential inputs, while the ADS7883 lacks both, increasing susceptibility to noise and requiring external amplification and filtering. To preserve signal integrity, you must add a precision op-amp front-end and anti-aliasing filter, which increases BOM cost and board space—negating the savings. Additionally, the ADS8689IPWR supports internal reference mode with better drift performance (3 ppm/°C typical), whereas the ADS7883 relies solely on external references, introducing additional thermal drift risk. For 16-bit systems, stick with the ADS8689IPWR or consider pin-compatible alternatives like the ADS8691 for higher throughput without sacrificing accuracy.
How does the ADS8689IPWR’s pseudo-differential input architecture impact common-mode noise rejection in long-cable industrial environments, and what layout practices mitigate ground loop risks?
The ADS8689IPWR’s pseudo-differential input provides limited common-mode rejection compared to fully differential ADCs, making it vulnerable to ground potential differences in long-cable installations typical in factory automation or motor control systems. While it accepts a small common-mode range around the reference voltage, noise coupled through ground loops or EMI can corrupt the LSBs, especially at 16-bit resolution. To mitigate this, use shielded twisted-pair cables with the shield grounded at one end only, implement a star-ground topology near the ADC, and place a low-pass RC filter (e.g., 1 kΩ + 10 nF) close to the input pins. Additionally, route analog and digital traces separately and avoid crossing split planes under the TSSOP package. These practices help maintain SNR and prevent intermittent conversion errors due to ground bounce or induced currents.
Can the ADS8689IPWR operate reliably with a 3.3V digital supply in a mixed-voltage SPI system alongside a 1.8V microcontroller, and what level-shifting strategy is recommended?
Yes, the ADS8689IPWR can interface with a 1.8V microcontroller despite its 3.3V digital supply because its SPI inputs are 5V-tolerant and recognize logic high as low as 0.7 × DVDD (≈2.3V for 3.3V supply), which exceeds typical 1.8V MCU output levels. However, to ensure robust communication and avoid marginal logic thresholds, use a bidirectional level translator like the TXB0104 or SN74LVC8T245 on the SDI, SCLK, and CS lines. Avoid resistor dividers, as they can distort high-speed SPI edges and violate timing margins at 100 kSPS. Also, ensure the microcontroller samples SDO on the correct clock edge—the ADS8689IPWR uses SPI Mode 1 (CPOL=0, CPHA=1)—and add a 10–100 Ω series resistor near the ADC’s SDO pin to dampen reflections in longer traces.
What thermal management and PCB layout considerations are critical when using the ADS8689IPWR in a high-temperature industrial enclosure operating near its 125°C limit?
Operating the ADS8689IPWR near its 125°C junction temperature limit requires careful thermal design to avoid reference drift and increased INL errors. The internal reference (if used) has a 3 ppm/°C drift spec, which can introduce up to 375 µV error at full scale over a 125°C range—critical in precision measurement. Use an external low-drift reference (e.g., REF5050, 0.5 ppm/°C) and place it close to the REF pin with a 10 µF ceramic bypass capacitor. Ensure the 16-TSSOP package is mounted on a thermally stable PCB with adequate copper pour under the thermal pad (if exposed) and avoid placing heat-generating components like DC-DC converters nearby. Monitor self-heating during continuous conversions; at 100 kSPS, power dissipation is ~8 mW, but cumulative thermal rise in sealed enclosures can push the die beyond safe limits. Consider duty cycling or airflow if operating above 105°C ambient.
Is the ADS8689IPWR a suitable drop-in replacement for the legacy ADS8320 in existing 16-bit data acquisition designs, and what firmware or hardware changes are needed?
The ADS8689IPWR is not a direct drop-in replacement for the ADS8320 due to architectural and interface differences. While both are 16-bit SAR ADCs, the ADS8320 uses a parallel interface and lacks a PGA, whereas the ADS8689IPWR uses SPI and includes an integrated programmable gain amplifier—requiring a complete digital interface redesign. Additionally, the ADS8689IPWR operates with a single 5V analog supply and flexible 1.65V–5.25V digital supply, while the ADS8320 typically uses ±5V analog rails. To migrate, you must redesign the front-end conditioning (since the PGA may eliminate need for external amplifiers), update firmware to handle SPI timing and configuration registers, and verify timing compatibility with your MCU. However, the ADS8689IPWR offers superior integration, lower noise, and better temperature stability, making it a worthwhile upgrade for new designs—but expect significant rework, not a simple swap.
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ADS8689IPWR CAD Models
Texas Instruments ADS8689IPWR PCB symbols & footprints
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