ADC0844CCN Equivalent & Substitute Parts

Part Overview

The ADC0844CCN is an 8-bit Analog to Digital Converter manufactured by Texas Instruments, designed for data acquisition applications requiring 4-input multiplexed conversion with SAR (Successive Approximation Register) architecture. This device operates with external voltage references and supports differential, pseudo-differential, and single-ended input configurations.

The ADC0844CCN is classified as Obsolete, making it necessary to identify functionally compatible substitute components for new designs or production continuity. Substitute parts must maintain core electrical specifications including 8-bit resolution, 4-input multiplexing capability, SAR architecture, and compatible packaging to ensure direct replacement viability.

Substiute Parts

ADC0844CCN

Texas InstrumentsIn Stock: 4957ADC0844CCN Datasheet

Current PartRFQ

TLV0838CN

Texas InstrumentsIn Stock: 3077TLV0838CN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADC0844CCN must satisfy the following core electrical and mechanical criteria:

Critical Parameters for Substitution:

• Resolution: 8-bit minimum
• Input Configuration: Support for 4-input multiplexed operation with differential, pseudo-differential, and single-ended input types
• Architecture: SAR-based analog to digital conversion
• Package: 20-DIP form factor with 0.300" (7.62mm) pitch for through-hole mounting compatibility
• Reference Type: External voltage reference capability

Allowable Parameter Variations:

• Sampling rate may exceed the original specification (higher performance acceptable)
• Supply voltage ranges may differ if the substitute operates within compatible system voltage requirements
• Data interface may differ (Parallel vs. SPI) provided the substitute maintains functional equivalence in the target application context
• Number of input channels may exceed 4 (7 or 8 inputs acceptable with channel selection capability)

The TLV0838CN meets these substitution criteria while offering improved specifications in sampling rate and modern compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

ADC0844CCN Status Consideration: The ADC0844CCN is classified as Obsolete, indicating end-of-life status with no further manufacturing or support. New designs should transition to actively supported alternatives.

TLV0838CN as Primary Substitute: The TLV0838CN is designated as Last Time Buy, providing a defined procurement window for legacy system support or transition planning. This device maintains electrical compatibility through identical 8-bit resolution, SAR architecture, external reference capability, and 20-DIP packaging. The TLV0838CN offers performance improvements including 51.6% higher sampling rate (37.9k vs. 25k samples per second) and expanded input channel options (4, 7, or 8 inputs selectable).

Compliance and Supply Considerations: The TLV0838CN achieves ROHS3 compliance, addressing modern regulatory requirements where the original ADC0844CCN does not. Supply availability for TLV0838CN is documented at 2,988 pieces in stock, supporting both prototype and production quantities.

Interface Transition: The data interface differs between devices (Parallel vs. SPI). System designs must accommodate this interface change through appropriate firmware or hardware adaptation. The SPI interface of the TLV0838CN provides reduced pin count requirements and simplified multi-device communication capability.

Supply Voltage Adaptation: The TLV0838CN operates at 2.7V to 3.6V supply voltages, compared to the ADC0844CCN's 4.5V to 6V range. System power supply architecture must be evaluated to ensure compatibility with the lower voltage requirement.

Frequently Asked Questions (FAQ)

Q: Can the TLV0838CN directly replace the ADC0844CCN without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to differences in data interface (Parallel vs. SPI) and supply voltage requirements (2.7V–3.6V vs. 4.5V–6V). Circuit redesign is required to accommodate these changes, including interface signal routing and power supply adjustment.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: 8-bit resolution, SAR architecture, 4-input multiplexed configuration, external voltage reference capability, differential/pseudo-differential/single-ended input support, and 20-DIP through-hole packaging. The TLV0838CN satisfies all these criteria.

Q: Does the higher sampling rate of the TLV0838CN (37.9k vs. 25k samples/second) affect system compatibility?

A: Higher sampling rate represents improved performance and does not create compatibility issues. System designs can operate the TLV0838CN at lower effective sampling rates if required by application timing constraints.

Q: Are there compliance differences between the ADC0844CCN and TLV0838CN?

A: Yes. The TLV0838CN is ROHS3 compliant, while the ADC0844CCN is RoHS non-compliant. For applications subject to RoHS regulations, the TLV0838CN provides regulatory compliance. Both devices are REACH Unaffected and classified under ECCN EAR99.

Q: What is the significance of the TLV0838CN's Last Time Buy status?

A: Last Time Buy status indicates a defined final procurement window before the device reaches end-of-life. Customers requiring this component should establish procurement timelines accordingly. The ADC0844CCN's Obsolete status makes the TLV0838CN the recommended transition path.

Q: Can the TLV0838CN's 7 or 8-input configurations be used in place of the 4-input ADC0844CCN?

A: Yes. The TLV0838CN supports 4, 7, or 8-input channel selection through configuration. Systems designed for 4-input operation can utilize the TLV0838CN configured for 4-channel multiplexing, with additional channels available for future expansion if needed.

Q: How does the SPI interface of the TLV0838CN compare to the parallel interface of the ADC0844CCN?

A: The SPI interface reduces the number of signal lines required for data communication compared to parallel output. System firmware must be adapted to support SPI protocol timing and data framing. SPI communication enables simplified multi-device daisy-chaining and reduced PCB routing complexity.