PCM1795DB

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1. Description

The PCM1795DB device is a monolithic CMOS integrated circuit that includes stereo digital-to-analog converters (DACs) and support circuitry in a small SSOP-28 package. The data converters use TI’s advanced segment DAC architecture to achieve excellent dynamic performance and improved tolerance to clock jitter. The PCM1795 provides balanced current outputs, letting the user optimize analog performance externally. The PCM1795 accepts pulse code modulation (PCM) and direct stream digital (DSD) audio data formats, thus providing an easy interface to audio digital signal processors (DSPs) and decoder chips. The PCM1795DB device also interfaces with external digital filter devices such as the DF1704, DF1706, and the PMD200 from Pacific Microsonics™. Sampling rates up to 200 kHz are supported. A full set of user- programmable functions is accessible through an SPI or I2C serial control port that supports register write and readback functions. The PCM1795DB device also supports the time-division-multiplexed (TDM) command and audio (TDMCA) data format.

2. Features

    1. 32-Bit Resolution

    2. Analog Performance:

        – Dynamic Range: 123 dB

        – THD+N: 0.0005%

    3. Differential Current Output: 3.9 mAPP

    4. 8× Oversampling Digital Filter:

        – Stop-Band Attenuation: –98 dB

        – Passband Ripple: ±0.0002 dB 

    5. Sampling Frequency: 10 kHz to 200 kHz

    6. System Clock: 128, 192, 256, 384, 512, or 768 S With Autodetect

    7. Accepts 16-, 24-, and 32-Bit Audio Data

    8. PCM Data Formats: Standard, I2S, and Left-Justified

    9. DSD Format Interface Available

  10. Interface Available for Optional External Digital Filter or DSP

  11. TDMCA or Serial Port (SPI™/I2C)

  12. User-Programmable Mode Controls:

        – Digital Attenuation: 0 dB to –120 dB, 0.5-dB/Step

        – Digital De-Emphasis

        – Digital Filter Roll-Off: Sharp or Slow

        – Soft Mute

        – Zero Flag for Each Output

  13. Compatible With PCM1792A and PCM1796 (Pins and Mode Controls)

  14. Dual Supply Operation:

        – 5-V Analog, 3.3-V Digital

  15. 5-V Tolerant Digital Inputs

  16. Small SSOP-28 Package

3. Applications

    1. A/V Receivers

    2. SACD Players

    3. DVD Players

    4. HDTV Receivers

    5. Car Audio Systems

    6. Digital Multitrack Recorders

    7. Other Applications Requiring 32-Bit Audio

4. pin configuration