DSD1702E Audio DAC Equivalent & Substitute Parts

Part Overview

The DSD1702E is a 24-bit stereo audio digital-to-analog converter manufactured by Texas Instruments, designed for high-resolution audio applications supporting both DSD and PCM data interfaces. The device operates at a 200 kHz sampling rate and is housed in a 20-SSOP surface mount package. Currently classified as obsolete, the DSD1702E requires identification of functionally compatible alternatives for new designs and ongoing production support. Substitute parts must maintain equivalent audio performance specifications, channel configuration, resolution, and supply voltage compatibility while accommodating package and interface variations.

Substiute Parts

DSD1702E

Texas InstrumentsIn Stock: 1499DSD1702E Datasheet

Current PartRFQ

PCM1742E

Burr BrownIn Stock: 1389PCM1742E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DSD1702E is determined by the following critical parameters:

• Audio DAC Type: Stereo configuration with 24-bit resolution
• Sampling Rate: 200 kHz operation
• Data Interface Compatibility: DSD and PCM support (primary); I2S support (acceptable alternative)
• Supply Voltage: Dual supply (analog and digital) within 3V–3.6V and 5V ranges
• Operating Temperature Range: -25°C to 85°C
• Surface Mount Packaging: SSOP family with equivalent footprint dimensions
• Compliance: ROHS3 compliance and MSL rating

The PCM1742E qualifies as a substitute based on matching audio DAC functionality, 24-bit resolution, 200 kHz sampling rate, dual supply voltage compatibility, identical operating temperature range, and surface mount SSOP packaging. The primary difference is the data interface (I2S instead of DSD/PCM), which represents a functional trade-off acceptable in applications where DSD support is not mandatory.

Parameter Comparison

Engineering Selection Recommendations

The PCM1742E is the designated substitute for the obsolete DSD1702E based on the following criteria:

Product Status Alignment: The PCM1742E maintains active product status, ensuring long-term availability and manufacturer support, whereas the DSD1702E is obsolete and subject to inventory depletion.

Electrical Equivalence: Both devices maintain identical 24-bit resolution, 200 kHz sampling rate, dual supply voltage ranges (3V–3.6V and 5V), and operating temperature specifications (-25°C to 85°C), ensuring functional compatibility in audio signal processing applications.

Packaging Compatibility: Both components use SSOP surface mount packages with identical body width (0.154", 3.90mm). The PCM1742E uses a 16-pin configuration versus the DSD1702E's 20-pin configuration, requiring PCB layout modification but maintaining equivalent thermal and mechanical mounting characteristics.

Interface Consideration: The PCM1742E implements I2S data interface instead of DSD/PCM. This substitution is valid for applications requiring PCM audio processing at 200 kHz. Applications requiring DSD format support must evaluate alternative solutions outside this substitute relationship.

Compliance Status: The PCM1742E maintains equivalent regulatory compliance suitable for audio applications, with Burr Brown manufacturing standards consistent with Texas Instruments specifications.

Frequently Asked Questions (FAQ)

Q: Can the PCM1742E directly replace the DSD1702E without PCB modifications?

A: No. The PCM1742E uses a 16-SSOP package versus the DSD1702E's 20-SSOP package. PCB layout changes are required to accommodate the different pin count and pinout configuration. Pin-to-pin compatibility cannot be assumed.

Q: What is the primary functional difference between these two DACs?

A: The DSD1702E supports both DSD and PCM data interfaces, while the PCM1742E supports only I2S interface. For applications requiring DSD format decoding, the PCM1742E is not suitable. For PCM-only applications, the I2S interface provides equivalent functionality.

Q: Is the PCM1742E suitable for all DSD1702E applications?

A: The PCM1742E is suitable only for applications that do not require DSD format support. Both devices share identical 24-bit resolution, 200 kHz sampling rate, and supply voltage specifications. Applications limited to PCM audio processing will function equivalently.

Q: What are the supply voltage requirements for both devices?

A: Both the DSD1702E and PCM1742E require dual supply voltages: 3V to 3.6V and 5V. Separate analog and digital supply pins must be provided in the circuit design.

Q: Are there package footprint considerations for PCB design?

A: Yes. The DSD1702E uses a 20-SSOP package (0.154" width), while the PCM1742E uses a 16-SSOP package (0.154" width). Although both are SSOP family with identical body width, the pin count difference requires complete PCB layout redesign. Existing footprints cannot be reused without modification.

Q: What is the operating temperature range for both devices?

A: Both devices operate across -25°C to 85°C, ensuring compatibility in industrial and consumer audio applications with identical thermal specifications.

Q: Is the PCM1742E currently available?

A: Yes. The PCM1742E maintains active product status with manufacturer support, unlike the obsolete DSD1702E. Availability through authorized distributors is ongoing.