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ADS8508IBDW
Texas Instruments
IC ADC 12BIT SAR 20SOIC
1484 Pcs New Original In Stock
12 Bit Analog to Digital Converter 1 Input 1 SAR 20-SOIC
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5.0 / 5.0
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ADS8508IBDW
Product Overview
1257565
DiGi Electronics Part Number
ADS8508IBDW-DGManufacturer
Texas Instruments
ADS8508IBDW
Description
IC ADC 12BIT SAR 20SOICInventory
1484 Pcs New Original In Stock
12 Bit Analog to Digital Converter 1 Input 1 SAR 20-SOIC
Quantity
Minimum 1
Minimum 1
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ADS8508IBDW Technical Specifications
Category
Data Acquisition, Analog to Digital Converters (ADC)
Packaging
Tube
Series
-
Product Status
Active
Number of Bits
12
Sampling Rate (Per Second)
250k
Number of Inputs
1
Input Type
Single Ended
Data Interface
SPI
Configuration
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
5V
Features
-
Operating Temperature
-40°C ~ 85°C
Package / Case
20-SOIC (0.295", 7.50mm Width)
Supplier Device Package
20-SOIC
Mounting Type
Surface Mount
Base Product Number
ADS8508
Datasheet & Documents
Manufacturer Product Page
ADS8508IBDW Specifications
HTML Datasheet
ADS8508IBDW-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
2156-ADS8508IBDW
ADS8508IBDWG4
-ADS8508IBDWG4-NDR
296-18679-5-NDR
-296-18679-5-DG
296-18679-5
-ADS8508IBDW-NDR
ADS8508IBDWG4-DG
-296-18679-5
-ADS8508IBDWG4
TEXTISADS8508IBDW
-296-18679-5-NDR
Standard Package
25
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
I trust DiGi Electronics's logistics updates—they are always timely and precise.
de desembre 02, 2025
Always a pleasure shopping here due to their quick shipping and great prices.
de desembre 02, 2025
I appreciate how well their products hold up over time, reducing the need for replacements.
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Frequently Asked Questions (FAQ)
When replacing an older ADS7822 or ADS7830 in a 5V single-supply industrial sensor system, what are the key design risks when switching to the ADS8508IBDW, and how can I mitigate them?
The ADS8508IBDW offers higher resolution (12-bit vs. 8/10-bit) and faster throughput (250 kSPS), but its external reference requirement and tighter timing on the SPI interface introduce compatibility risks. Unlike the ADS7822/7830, which often use internal references, the ADS8508IBDW requires a stable external reference—poor reference choice can degrade SNR. Additionally, its minimum SCLK high/low times (t4/t5) are stricter; ensure your MCU’s SPI peripheral meets these at full speed. Mitigate by validating signal integrity with an oscilloscope, using a low-noise reference like the REF5025, and testing worst-case timing margins across the −40°C to 85°C range.
Can the ADS8508IBDW safely interface with a 3.3V microcontroller SPI bus without level shifting, and what are the long-term reliability implications?
While the ADS8508IBDW’s digital inputs are 5V-tolerant and accept 3.3V logic levels (VIH min ≈ 3.5V at 5V VDD, but typically functional down to ~2.5V due to Schmitt-trigger inputs), relying on marginal voltage margins risks intermittent communication failures—especially at temperature extremes or with long PCB traces. Over time, this can cause undetected data corruption in mission-critical systems. For reliable operation, use a bidirectional level shifter (e.g., TXB0104) or ensure your MCU’s 3.3V output meets VIH under all load conditions. Avoid direct connection if system uptime or data integrity is critical.
In a high-noise motor control environment, how should I lay out the PCB for the ADS8508IBDW to maintain 12-bit accuracy, and what common layout mistakes degrade performance?
To preserve 12-bit performance with the ADS8508IBDW in noisy environments, isolate analog and digital grounds with a single-point connection near the ADC, place the external reference (e.g., REF5025) within 5mm of the REFIN pin with a 10µF + 0.1µF bypass, and route analog input traces away from switching nodes or clock lines. Avoid running digital SPI lines parallel to the analog input—this induces crosstalk that manifests as code jitter. Use a solid ground plane beneath the device but do not split it under the ADC. A common mistake is neglecting the AGND-to-DGND connection strategy or using long, unshielded input traces, which act as antennas for EMI, degrading ENOB significantly.
Is the ADS8508IBDW a drop-in replacement for the Maxim MAX1246 in a 5V, single-ended, SPI-based data acquisition module, and what firmware or hardware changes are needed?
The ADS8508IBDW is not a true drop-in replacement for the MAX1246 due to architectural differences: the MAX1246 includes an internal reference and auto-shutdown, while the ADS8508IBDW requires an external reference and has no power-down mode. You must add an external reference circuit (e.g., REF5025 + decoupling) and modify firmware to manage conversion timing—the ADS8508IBDW requires a falling edge on CONVST to start conversion, whereas the MAX1246 uses CS-based triggering. Additionally, verify SPI clock polarity/phase compatibility; both support Mode 1, but timing margins differ. Test full-scale linearity after replacement, as reference stability directly impacts accuracy on the ADS8508IBDW.
How does the ADS8508IBDW’s sampling behavior under variable input source impedance affect measurement accuracy in thermocouple or strain gauge applications, and what input buffer strategy is recommended?
The ADS8508IBDW has a sample-and-hold capacitor that draws transient current during acquisition, causing voltage droop if driven by a high-impedance source (>1kΩ). In thermocouple or strain gauge circuits with high-output impedance amplifiers, this leads to nonlinear errors and reduced effective resolution. To avoid this, always use a low-output-impedance buffer op-amp (e.g., OPA365) between the sensor and the ADC input. The buffer should have <10Ω output impedance and sufficient bandwidth (>10MHz) to settle within the acquisition time. Without buffering, measurement errors can exceed 2–3 LSBs, especially at higher sampling rates or with slow-settling sensors—rendering the 12-bit capability unusable in precision applications.
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ADS8508IBDW CAD Models
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