Overview
The PCM1794ADBR, produced by Texas Instruments, is a high-performance 24-bit stereo digital-to-analog converter (DAC) integrated circuit. It is designed using TI’s advanced segment DAC architecture, which ensures excellent dynamic performance and improved tolerance to clock jitter. The device is packaged in a small 28-lead SSOP package and supports sampling rates up to 200 kHz. It features balanced current outputs, allowing users to optimize analog performance externally. The PCM1794ADBR is suitable for various audio applications requiring high-quality digital-to-analog conversion.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 24 bits |
| Package / Case | SSOP-28 |
| Number of DAC Outputs | 2 |
| SNR - Signal to Noise Ratio | 127 dB (2 V RMS, Stereo) |
| Dynamic Range | 132 dB (9 V RMS, Mono), 129 dB (4.5 V RMS, Stereo), 127 dB (2 V RMS, Stereo) |
| THD+N | 0.0004% |
| Differential Current Output | 7.8 mA p-p |
| Sampling Frequency | 10 kHz to 200 kHz |
| System Clock | 128, 192, 256, 384, 512, or 768 fS with Autodetect |
| Audio Data Formats | Standard, I2S, Left-Justified |
| Supply Voltage | 5-V Analog, 3.3-V Digital |
| Digital Input Voltage | 5-V Tolerant |
Key Features
- Advanced segment DAC architecture for excellent dynamic performance and improved tolerance to clock jitter.
- Balanced current outputs for optimized analog performance.
- Support for sampling rates up to 200 kHz.
- Accepts 16- and 24-bit audio data.
- Optional interface available to external digital filter or DSP.
- Digital de-emphasis and filter rolloff (sharp or slow).
- Soft mute and zero flag features.
- Dual-supply operation: 5-V analog, 3.3-V digital.
- 5-V tolerant digital inputs.
Applications
- A/V Receivers
- DVD Players
- Musical Instruments
- HDTV Receivers
- Car Audio Systems
- Digital Multitrack Recorders
- Other applications requiring 24-bit audio
Q & A
- What is the resolution of the PCM1794ADBR?
The PCM1794ADBR has a resolution of 24 bits. - What is the signal-to-noise ratio (SNR) of the PCM1794ADBR?
The SNR is 127 dB (2 V RMS, Stereo). - What are the supported sampling frequencies?
The device supports sampling frequencies from 10 kHz to 200 kHz. - What are the supported audio data formats?
The PCM1794ADBR supports Standard, I2S, and Left-Justified audio data formats. - What is the differential current output of the PCM1794ADBR?
The differential current output is 7.8 mA p-p. - Does the PCM1794ADBR support external digital filters or DSPs?
Yes, it has an optional interface available to external digital filters or DSPs. - What are the supply voltage requirements for the PCM1794ADBR?
The device requires 5-V analog and 3.3-V digital supply voltages. - Is the PCM1794ADBR RoHS compliant?
Yes, the PCM1794ADBR is RoHS compliant. - What is the package type of the PCM1794ADBR?
The device is packaged in a 28-lead SSOP package. - What are some common applications of the PCM1794ADBR?
Common applications include A/V receivers, DVD players, musical instruments, HDTV receivers, car audio systems, and digital multitrack recorders.
