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ADS7825P Equivalent & Substitute Parts
Part Overview
The ADS7825P is a 16-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for data acquisition applications requiring 4 single-ended inputs with a 40 kHz sampling rate. The device operates with both SPI and parallel data interfaces, supporting external and internal voltage references at 5V supply levels.
The ADS7825P is classified as obsolete. Finding equivalent and substitute parts is necessary to ensure continued availability for new designs, system upgrades, and production continuity where original components are no longer manufactured or stocked.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | ADS7825P |
| Manufacturer | Texas Instruments |
| Resolution (Bits) | 16 |
| Number of Inputs | 4 |
| Input Type | Single Ended |
| Sampling Rate | 40 kHz |
| Architecture | SAR (Successive Approximation Register) |
| Data Interface | SPI, Parallel |
| Analog Supply Voltage | 5V |
| Digital Supply Voltage | 5V |
| Operating Temperature Range | -40°C to 85°C |
| Package Type | 28-DIP (Through Hole) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the ADS7825P is determined by the following core electrical and mechanical parameters:
- Resolution: 16-bit ADC capability
- Input Configuration: 4-channel input support
- Sampling Rate: Minimum 40 kHz performance
- Architecture: SAR-based analog-to-digital conversion
- Supply Voltage Compatibility: 5V analog supply operation
- Data Interface: SPI or parallel communication capability
- Reference Type: Support for external and internal voltage references
The ADS8684IDBT qualifies as a direct substitute based on matching or exceeding all critical electrical parameters. While the package format differs (surface mount vs. through hole), the functional performance and electrical specifications align with or exceed the original ADS7825P requirements.
Parameter Comparison
| Parameter | ADS7825P (Main Part) | ADS8684IDBT (Substitute) |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Resolution (Bits) | 16 | 16 |
| Number of Inputs | 4 | 4 |
| Input Type | Single Ended | Differential, Single Ended |
| Sampling Rate | 40 kHz | 500 kHz |
| Architecture | SAR | SAR |
| Data Interface | SPI, Parallel | SPI |
| Analog Supply Voltage | 5V | 5V |
| Digital Supply Voltage | 5V | 1.65V to 5.25V |
| Operating Temperature Range | -40°C to 85°C | -40°C to 125°C |
| Package Type | 28-DIP (Through Hole) | 38-TSSOP (Surface Mount) |
| Product Status | Obsolete | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | MSL 3 (168 Hours) | MSL 2 (1 Year) |
Engineering Selection Recommendations
The ADS8684IDBT is the manufacturer-recommended substitute for the ADS7825P. Both devices are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.
Key advantages of the ADS8684IDBT:
- Active product status ensures long-term availability and manufacturing support
- Sampling rate of 500 kHz exceeds the original 40 kHz specification, providing performance headroom
- Extended operating temperature range (-40°C to 125°C) supports broader application environments
- Improved moisture sensitivity level (MSL 2) reduces handling and storage risks
- Programmable Gain Amplifier (PGA) feature provides additional signal conditioning capability
- Digital supply voltage range (1.65V to 5.25V) offers greater design flexibility
Design consideration:
The ADS8684IDBT uses SPI interface only, whereas the ADS7825P supports both SPI and parallel interfaces. Applications requiring parallel data communication must implement SPI-based communication protocols or evaluate alternative substitutes.
Frequently Asked Questions (FAQ)
Q: Can the ADS8684IDBT directly replace the ADS7825P in existing designs?
A: Electrical substitution is valid. The ADS8684IDBT meets or exceeds all core electrical specifications. However, package format differs (surface mount vs. through hole), requiring PCB redesign and potential circuit board layout modifications.
Q: What is the impact of the different package types?
A: The ADS7825P uses a 28-pin DIP package for through-hole mounting, while the ADS8684IDBT uses a 38-pin TSSOP package for surface-mount assembly. New PCB designs must accommodate the surface-mount footprint and pin configuration of the ADS8684IDBT.
Q: Does the ADS8684IDBT support parallel data output?
A: No. The ADS8684IDBT communicates exclusively through SPI interface. The original ADS7825P supports both SPI and parallel interfaces. Applications dependent on parallel data communication require alternative component evaluation.
Q: Are there supply voltage compatibility concerns?
A: The ADS8684IDBT digital supply voltage range (1.65V to 5.25V) is broader than the fixed 5V requirement of the ADS7825P, providing greater flexibility. Analog supply voltage remains 5V for both devices.
Q: What is the significance of the Programmable Gain Amplifier (PGA) feature?
A: The ADS8684IDBT includes an integrated PGA for signal conditioning, allowing software-configurable gain adjustment. The ADS7825P does not include this feature. This addition enables improved signal-to-noise ratio and dynamic range optimization in new designs.
Q: Are both devices compliant with current environmental standards?
A: Yes. Both the ADS7825P and ADS8684IDBT are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.
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