DAC 2-CH Segment 24-bit 28-Pin SSOP T/R

The PCM1796 is a monolithic CMOS integrated circuit that includes stereo digital-to-analog converters and support circuitry in a small 28-lead SSOP package. The data converters use TI’s advanced segment DAC architecture to achieve excellent dynamic performance and improved tolerance to clock jitter. The PCM1796 provides balanced current outputs, allowing the user to optimize analog performance externally. The PCM1796 accepts PCM and DSD audio data formats, providing easy interfacing to audio DSP and decoder chips. The PCM1796 also interfaces with external digital filter devices (DF1704, DF1706, PMD200). 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, which supports register write and readback functions. The PCM1796 also supports the time division multiplexed command and audio (TDMCA) data format.

24-Bit Resolution

Analog Performance:

• Dynamic Range: 123 dB
• THD+N: 0.0005%

Differential Current Output: 4 mA p-p

8× Oversampling Digital Filter:

• Stop-Band Attenuation: –98 dB
• Pass-Band Ripple: ±0.0002 dB

Sampling Frequency: 10 kHz to 200 kHz

System Clock: 128, 192, 256, 384, 512, or 768 f_S With Autodetect

Accepts 16-, 20-, and 24-Bit Audio Data

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

DSD Format Interface Available

Interface Available for Optional External Digital Filter or DSP

TDMCA or Serial Port (SPI/I2C)

User-Programmable Mode Controls:

• Digital Attenuation: 0 dB to –120 dB, 0.5 dB/Step
• Digital De-Emphasis
• Digital Filter Rolloff: Sharp or Slow
• Soft Mute
• Zero Flag for Each Output

Compatible With PCM1792 (Pins and Mode Controls)

Dual Supply Operation:

• 5-V Analog, 3.3-V Digital

5-V Tolerant Digital Inputs

Small 28-Lead SSOP Package

APPLICATIONS

• A/V Receivers
• SACD Players
• DVD Players
• HDTV Receivers
• Car Audio Systems
• Digital Multitrack Recorders
• Other Applications Requiring 24-Bit Audio