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ADS820U/1K Equivalent & Substitute Parts
Part Overview
The ADS820U/1K is a 10-bit pipelined analog-to-digital converter manufactured by Texas Instruments, housed in a 28-SOIC surface mount package. This device features a single differential or single-ended input with a 20 MHz sampling rate and operates on 5V analog and digital supply voltages. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Number of Bits | 10 |
| Sampling Rate (Per Second) | 20M |
| Number of Inputs | 1 |
| Input Type | Differential, Single Ended |
| Data Interface | Parallel |
| Architecture | Pipelined |
| Reference Type | External, Internal |
| Voltage - Supply, Analog | 5V |
| Voltage - Supply, Digital | 5V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 28-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the ADS820U/1K is determined by strict equivalence across the following critical parameters:
- Resolution: 10-bit conversion capability
- Sampling Rate: 20 MHz minimum throughput
- Input Configuration: Support for both differential and single-ended inputs
- Architecture: Pipelined ADC topology
- Supply Voltages: 5V analog and digital supplies
- Package: 28-SOIC form factor with identical pinout compatibility
- Temperature Range: -40°C to 85°C operating specification
- Data Interface: Parallel output structure
The ADS820U from Burr Brown meets all specified electrical and mechanical parameters and is identified as the manufacturer-recommended substitute. Both devices share identical functional specifications, package geometry, and electrical characteristics, enabling direct replacement in existing designs.
Parameter Comparison
| Parameter | ADS820U/1K (Texas Instruments) | ADS820U (Burr Brown) |
|---|---|---|
| Number of Bits | 10 | 10 |
| Sampling Rate (Per Second) | 20M | 20M |
| Number of Inputs | 1 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | Parallel | Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S/H:ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | Pipelined | Pipelined |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 28-SOIC (0.295", 7.50mm Width) | 28-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | Not specified |
Engineering Selection Recommendations
The ADS820U from Burr Brown is the direct functional equivalent for the obsolete ADS820U/1K. Selection between these parts should be based on the following factors:
Product Status: The ADS820U/1K is classified as obsolete, while the ADS820U maintains active product status. For new designs or long-term system support, the ADS820U is the appropriate selection.
Compliance and Certifications: The ADS820U/1K carries ROHS3 compliance certification. Compliance status for the substitute part should be verified against specific procurement requirements before final selection.
Regulatory Classifications: Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, ensuring equivalent regulatory treatment.
Inventory and Availability: Current stock levels differ between manufacturers. Procurement decisions should account for lead times and supply chain requirements specific to your application timeline.
Frequently Asked Questions (FAQ)
Q: Can the ADS820U directly replace the ADS820U/1K in existing designs?
A: Yes. Both devices are electrically and mechanically identical across all specified parameters. The 28-SOIC package geometry, pinout, and functional characteristics are equivalent, enabling direct substitution without circuit modifications.
Q: What determines whether a part qualifies as a substitute for the ADS820U/1K?
A: Substitution eligibility is strictly determined by matching all critical parameters: 10-bit resolution, 20 MHz sampling rate, single input with differential and single-ended support, pipelined architecture, 5V supply voltages, 28-SOIC package, and -40°C to 85°C operating temperature range.
Q: Why is the ADS820U/1K classified as obsolete?
A: Obsolescence status indicates the part is no longer in active production. The ADS820U from Burr Brown represents the active equivalent for ongoing procurement and design support.
Q: Are there any differences in RoHS compliance between the two parts?
A: The ADS820U/1K is certified ROHS3 compliant. RoHS compliance status for the ADS820U substitute should be confirmed with the supplier or manufacturer datasheet before procurement.
Q: What is the significance of the 28-SOIC package specification?
A: The 28-SOIC package defines the physical form factor and pinout. Both parts use identical 28-SOIC packaging with 0.295" width (7.50mm), ensuring mechanical and electrical compatibility on printed circuit boards without layout modifications.
Q: Can the ADS820U operate with different supply voltages than the ADS820U/1K?
A: No. Both devices require 5V analog and digital supply voltages. Operation outside this specification is not supported.
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