Overview
The PCM1798DBR from 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 and supports sampling rates up to 200 kHz. It is suitable for various audio applications requiring high fidelity and precision.
Key Specifications
| Parameter | Test Conditions | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|
| Resolution | 24 | Bits | |||
| Data Format | Standard, I2S, Left-Justified | ||||
| Audio Data Bit Length | 16-, 24-bit | ||||
| Sampling Frequency (fS) | 10 | 200 | kHz | ||
| System Clock Frequency | 128, 192, 256, 384, 512, 768 fS | ||||
| Dynamic Range | fS = 44.1 kHz | 120 | 123 | dB | |
| THD+N | fS = 44.1 kHz | 0.0005% | 0.001% | % | |
| Output Current | Full scale (0 dB) | 4 | mAp-p | ||
| Supply Voltage (VCC1, VCC2L, VCC2R) | 4.75 | 5 | 5.25 | V | |
| Supply Voltage (VDD) | 3.0 | 3.3 | 3.6 | V | |
| Operating Temperature | -25 | 85 | °C |
Key Features
- Advanced Segment DAC Architecture: Ensures excellent dynamic performance and improved tolerance to clock jitter.
- High Resolution and Dynamic Range: 24-bit resolution with a dynamic range of 123 dB and a THD+N of 0.0005%.
- Flexible Data Formats: Supports standard, I2S, and left-justified audio data formats with 16- or 24-bit data lengths.
- Wide Sampling Frequency Range: Supports sampling frequencies from 10 kHz to 200 kHz.
- Dual-Supply Operation: 5-V analog supply and 3.3-V digital supply.
- Differential Current Output: Allows for optimized analog performance with external current-to-voltage conversion.
- Internal and External Digital Filter Options: Includes internal digital filters with sharp and slow rolloff options, and the ability to bypass for external digital filter use.
- Soft Mute and Zero Flag: Features for smooth audio transitions and status indication.
Applications
- A/V Receivers: High-fidelity audio conversion for home entertainment systems.
- DVD Players: Enhanced audio quality for digital video playback.
- HDTV Receivers: Superior audio performance for high-definition television.
- Car Audio Systems: High-quality audio conversion for automotive entertainment systems.
- Digital Multitrack Recorders: Professional-grade audio conversion for music production.
- Musical Instruments: Integrated into various musical instruments for high-quality audio output.
- Other Applications Requiring 24-Bit Audio: Any application demanding high-resolution audio conversion.
Q & A
- What is the resolution of the PCM1798DBR?
The PCM1798DBR has a 24-bit resolution. - What are the supported audio data formats?
The device supports standard, I2S, and left-justified audio data formats. - What is the range of sampling frequencies supported by the PCM1798DBR?
The device supports sampling frequencies from 10 kHz to 200 kHz. - What are the supply voltage requirements for the PCM1798DBR?
The device requires a 5-V analog supply and a 3.3-V digital supply. - What is the dynamic range of the PCM1798DBR?
The dynamic range is 123 dB. - Can the internal digital filter be bypassed?
Yes, the internal digital filter can be bypassed to allow for an external digital filter. - What is the typical THD+N for the PCM1798DBR?
The typical THD+N is 0.0005% at a sampling frequency of 44.1 kHz. - What is the output type of the PCM1798DBR?
The output is differential current. - What are some common applications of the PCM1798DBR?
Common applications include A/V receivers, DVD players, HDTV receivers, car audio systems, and digital multitrack recorders. - What is the operating temperature range of the PCM1798DBR?
The operating temperature range is from -25°C to 85°C.
