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PCM1691DCAR Equivalent & Substitute Parts
Part Overview
The PCM1691DCAR is a 24-bit audio digital-to-analog converter (DAC) manufactured by Texas Instruments, designed for high-resolution audio applications with sampling rates up to 192 kHz. The device integrates 8 channels with DSP and I2S data interface capabilities, supporting dual voltage supply configurations (3V–3.6V and 5V). However, the PCM1691DCAR is classified as obsolete, which necessitates identification of active equivalent components to ensure design continuity and supply chain reliability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Data Acquisition |
| Type | DAC, Audio |
| Number of Channels | 8 |
| Resolution | 24 bits |
| Sampling Rate | 192 kHz |
| Data Interface | DSP, I2S |
| Voltage Supply | 3V–3.6V, 5V |
| Operating Temperature Range | −40°C to +85°C |
| Mounting Type | Surface Mount |
| Package | 48-PowerTFSOP (0.240", 6.10mm Width) |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution of the PCM1691DCAR is determined by strict equivalence across the following critical parameters:
- Channel Configuration: 8 channels (fixed requirement)
- Resolution: 24 bits (fixed requirement)
- Sampling Rate: 192 kHz (fixed requirement)
- Data Interface: DSP and I2S support (fixed requirement)
- Package Type: 48-PowerTFSOP form factor (fixed requirement)
- Voltage Supply Compatibility: Dual supply operation at 3V–3.6V and 5V (fixed requirement)
- Operating Temperature Range: −40°C to +85°C (fixed requirement)
- Mounting Technology: Surface Mount (fixed requirement)
The PCM1690DCAR meets all specified electrical and mechanical parameters and is classified as an active product with manufacturer recommended status, making it a direct functional equivalent.
Parameter Comparison
| Parameter | PCM1691DCAR | PCM1690DCAR | Match |
|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | ✓ |
| Type | DAC, Audio | DAC, Audio | ✓ |
| Number of Channels | 8 | 8 | ✓ |
| Resolution (Bits) | 24 | 24 | ✓ |
| Sampling Rate (kHz) | 192 | 192 | ✓ |
| Data Interface | DSP, I2S | DSP, I2S | ✓ |
| Voltage Supply | 3V–3.6V, 5V | 3V–3.6V, 5V | ✓ |
| Operating Temperature | −40°C to +85°C | −40°C to +85°C | ✓ |
| Mounting Type | Surface Mount | Surface Mount | ✓ |
| Package / Case | 48-PowerTFSOP (0.240", 6.10mm Width) | 48-PowerTFSOP (0.240", 6.10mm Width) | ✓ |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ✓ |
| MSL Rating | 3 (168 Hours) | 3 (168 Hours) | ✓ |
| Product Status | Obsolete | Active | — |
| Grade | Standard | Automotive | — |
| Qualification | — | AEC-Q100 | — |
Engineering Selection Recommendations
The PCM1690DCAR is the direct substitute for the obsolete PCM1691DCAR. Both components are manufactured by Texas Instruments and share identical electrical specifications, channel configuration, resolution, sampling rate, data interface protocol, voltage supply requirements, operating temperature range, and physical package dimensions.
The PCM1690DCAR carries active product status with manufacturer recommended designation, ensuring ongoing availability and supply chain support. The component maintains full ROHS3 compliance and identical moisture sensitivity ratings. The PCM1690DCAR additionally carries automotive-grade qualification (AEC-Q100), which provides enhanced reliability documentation suitable for demanding applications, though this does not alter functional compatibility for standard industrial or consumer audio applications.
Selection of the PCM1690DCAR eliminates obsolescence risk while maintaining complete design compatibility with existing PCM1691DCAR implementations.
Frequently Asked Questions (FAQ)
Q: Can the PCM1690DCAR be used as a direct replacement for the PCM1691DCAR in existing designs?
A: Yes. The PCM1690DCAR is electrically and mechanically equivalent to the PCM1691DCAR across all specified parameters, including channel count, resolution, sampling rate, data interface, voltage supply requirements, operating temperature range, and package form factor. No design modifications are required.
Q: What is the primary difference between the PCM1691DCAR and PCM1690DCAR?
A: The PCM1691DCAR is classified as obsolete, while the PCM1690DCAR is an active product with manufacturer recommended status. The PCM1690DCAR additionally carries automotive-grade qualification (AEC-Q100). Functional performance and electrical specifications are identical.
Q: Are the package dimensions identical between these two parts?
A: Yes. Both components use the 48-PowerTFSOP package with identical dimensions (0.240", 6.10mm Width). PCB layouts and footprints are interchangeable.
Q: Do both parts support the same voltage supply configurations?
A: Yes. Both the PCM1691DCAR and PCM1690DCAR support dual voltage supply operation at 3V–3.6V and 5V, with identical operating temperature ranges from −40°C to +85°C.
Q: Is the PCM1690DCAR suitable for automotive applications?
A: The PCM1690DCAR carries AEC-Q100 automotive qualification, making it suitable for automotive-grade applications. The PCM1691DCAR does not carry this qualification.
Q: What is the moisture sensitivity level for both components?
A: Both parts carry MSL rating 3 with a 168-hour exposure limit, indicating identical moisture handling and storage requirements.
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