ADS7808UG4 Equivalent & Substitute Parts

Part Overview

The ADS7808UG4 is a 12-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for single-ended input data acquisition applications. It features a Successive Approximation Register (SAR) architecture with a 100 kHz sampling rate and operates on 5V supply voltage for both analog and digital domains. The device is packaged in a 20-SOIC surface mount package.

The ADS7808UG4 is discontinued at DiGi Electronics. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or maintenance requirements.

Substiute Parts

ADS7808UG4

Texas InstrumentsIn Stock: 1188ADS7808UG4 Datasheet

Current PartRFQ

ADS8508IBDW

Texas InstrumentsIn Stock: 1484ADS8508IBDW Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ADS7808UG4 is determined by the following critical parameters:

• Resolution: 12-bit ADC capability
• Input Configuration: Single-ended input with 1 channel
• Architecture: SAR-based conversion
• Package Compatibility: 20-SOIC surface mount form factor
• Supply Voltage: 5V analog and digital supply
• Operating Temperature Range: -40°C to 85°C
• Reference Options: External and internal reference support
• Data Interface: SPI or DSP protocol support

The ADS8508IBDW meets all these core requirements and is therefore qualified as a direct substitute. The primary difference is an increased sampling rate (250 kHz versus 100 kHz), which represents an enhancement rather than a limitation for applications requiring the ADS7808UG4.

Parameter Comparison

Engineering Selection Recommendations

The ADS8508IBDW is the qualified substitute for the ADS7808UG4 based on the following criteria:

Compliance and Certification: Both devices maintain ROHS3 compliance and identical moisture sensitivity ratings, ensuring regulatory and environmental compatibility.

Product Availability: The ADS8508IBDW is currently active in production, providing reliable supply chain continuity compared to the discontinued ADS7808UG4.

Functional Compatibility: The substitute maintains identical resolution (12-bit), input configuration (single-ended, 1 channel), package form factor (20-SOIC), and supply voltage requirements (5V). The enhanced sampling rate of 250 kHz does not introduce incompatibility and provides additional performance headroom for applications.

Interface Consideration: The ADS8508IBDW supports SPI interface, which is common to both devices. The ADS7808UG4 additionally supports DSP interface; applications requiring DSP-specific protocol features should be evaluated against the substitute's SPI-only capability.

Frequently Asked Questions (FAQ)

Q: Can the ADS8508IBDW directly replace the ADS7808UG4 in existing designs?

A: Yes, for applications where the SPI interface is used. The ADS8508IBDW maintains identical pin configuration, package footprint, supply voltage, and resolution. If the original design uses the DSP interface, firmware or protocol adaptation may be required.

Q: What is the impact of the higher sampling rate in the ADS8508IBDW?

A: The increased sampling rate from 100 kHz to 250 kHz is a performance enhancement. It does not create incompatibility; applications designed for 100 kHz operation will function correctly with the faster device. No design changes are necessary.

Q: Are there any thermal or power consumption differences?

A: The provided specifications do not include thermal or power consumption data for either device. Consult the respective Texas Instruments datasheets for detailed power analysis if this is a critical design parameter.

Q: Is the 20-SOIC package identical between both devices?

A: Yes. Both devices use the 20-SOIC (0.295", 7.50mm Width) package with surface mount mounting type, ensuring PCB layout and assembly compatibility.

Q: What certifications apply to the substitute part?

A: The ADS8508IBDW maintains ROHS3 compliance and MSL 2 (1 Year) rating, matching the original ADS7808UG4. Both devices are REACH Unaffected and classified under ECCN EAR99.