PCM69AU-K Equivalent & Substitute Parts

Part Overview

The PCM69AU-K is an 18-bit audio digital-to-analog converter (DAC) manufactured by Texas Instruments, designed for audio applications requiring PCM data interface support. This component operates with a 5V supply and is housed in a 20-SOIC surface mount package. The product is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

PCM69AU-K

Texas InstrumentsIn Stock: 1029PCM69AU-K Datasheet

Current PartRFQ

PCM1793DB

Texas InstrumentsIn Stock: 2243PCM1793DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCM69AU-K is determined by the following critical parameters:

• Functional Category: Both components must be audio DACs with dual-channel output capability
• Resolution Compatibility: The substitute must support at least 18-bit resolution; higher resolution (24-bit) is acceptable for backward compatibility
• Data Interface: The substitute must support digital audio data protocols compatible with system requirements
• Supply Voltage: The substitute must operate within the system's available voltage rails
• Operating Temperature Range: The substitute must maintain the specified temperature operating window
• Mounting Technology: Surface mount packages are required for PCB integration
• Compliance Standards: RoHS3 compliance and REACH unaffected status must be maintained

The PCM1793DB qualifies as a substitute based on these parameters: it maintains dual-channel audio DAC functionality, exceeds resolution requirements (24-bit vs. 18-bit), supports multiple supply voltages including 5V operation, maintains the temperature range, uses surface mount technology, and meets all compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

The PCM1793DB is the manufacturer-recommended substitute for the obsolete PCM69AU-K. Selection of this substitute is supported by the following factors:

Product Status: The PCM1793DB maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete PCM69AU-K.

Compliance Alignment: Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory requirements are met in replacement applications.

Functional Upgrade: The PCM1793DB provides enhanced resolution (24-bit versus 18-bit), delivering improved audio fidelity while maintaining backward compatibility with dual-channel audio DAC requirements.

Voltage Compatibility: The PCM1793DB supports 5V operation within its specified voltage range (3V ~ 3.6V, 5V), matching the original component's supply requirements.

Temperature Range: Identical operating temperature specifications (-25°C ~ 85°C) ensure thermal performance equivalence across environmental conditions.

Design Considerations: PCB layout modifications are required due to package footprint differences (20-SOIC to 28-SSOP). Digital interface protocol differences (PCM to I2S) require firmware or signal conditioning evaluation to confirm system compatibility.

Frequently Asked Questions (FAQ)

Q: Can the PCM1793DB directly replace the PCM69AU-K without PCB modifications?

A: No. The PCM1793DB uses a 28-SSOP package while the PCM69AU-K uses a 20-SOIC package. PCB layout redesign is required to accommodate the different footprint dimensions and pin configuration.

Q: What is the impact of the different data interface protocols (PCM versus I2S)?

A: The PCM69AU-K uses PCM (Pulse Code Modulation) interface while the PCM1793DB uses I2S (Integrated Interchip Sound) interface. System compatibility depends on whether the host processor or audio controller can generate I2S signals. Signal protocol conversion may be necessary if the system is designed exclusively for PCM input.

Q: Does the higher resolution of the PCM1793DB (24-bit versus 18-bit) create compatibility issues?

A: No. Higher resolution is a functional enhancement that does not create backward compatibility problems. Systems designed for 18-bit audio will operate correctly with the 24-bit substitute; the additional resolution bits simply remain unused if the source material is 18-bit.

Q: Are there inventory or lead time advantages to using the PCM1793DB?

A: Yes. The PCM1793DB is actively manufactured with 2220 units in stock, compared to the obsolete PCM69AU-K with 954 units remaining. Active production status ensures ongoing availability for future orders.

Q: What supply voltage should be used with the PCM1793DB in a 5V system?

A: The PCM1793DB operates within the 3V ~ 3.6V and 5V supply ranges. For systems designed around 5V operation, the 5V supply specification applies directly without modification.

Q: Are there any compliance or certification differences between these components?

A: No. Both components maintain identical RoHS3 compliance and REACH unaffected status, ensuring regulatory equivalence in applications subject to these standards.