DSD1794

Features:

`Supports Both DSD and PCM Formats
`24-Bit Resolution
`Analog Performance:
− 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
`8* Oversampling Digital Filter:
− Stop-Band Attenuation: 130 dB
− Pass-Band Ripple: ±0.00001 dB
`Sampling Frequency: 10 kHz to 200 kHz
`System Clock: 128, 192, 256, 384, 512, or 768 fS With Autodetect
`Accepts 16-, 20-, and 24-Bit Audio Data
`PCM Data Formats: Standard, I2S, and Left-Justified
`Optional Interface to External Digital Filter or DSP Available
`I<sup>2</sup>C-Compatible Serial Port
`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
`Dual-Supply Operation:
− 5-V Analog, 3.3-V Digital
`5-V Tolerant Digital Inputs
`Small 28-Lead SSOP Package, Lead-Free Product


Application

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


Pinout




Specifications

		DSD1794
Supply voltage	VCC1, VCC2L, VCC2R	−0.3 V to 6.5 V
	VDD	−0.3 V to 4 V
Supply voltage differences	VCC1, VCC2L, VCC2R	±0.1 V
Ground voltage differences	AGND1, AGND2, AGND3L, AGND3R, DGND	±0.1 V
Digital input voltage	PLRCK, PDATA, PBCK, SCK, RST, MS(2), MDI, MC, DSDL(2), DSDR(2), DBCK	0.3 V to 6.5 V
	DSDL(3), DSDR(3), SDA(3)	0.3 V to (VDD + 0.3 V) < 4 V
Analog input voltage		0.3 V to (VCC + 0.3 V) < 6.5 V
Input current (any pins except supplies)		±10 mA
Ambient temperature under bias		40°C to 125°C
Storage temperature		55°C to 150°C
Junction temperature		150°C
Lead temperature (soldering)		260°C, 5 s
Package temperature (IR reflow, peak)		250°C

Description

The DSD1794 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 DSD1794 provides balanced current outputs, allowing the user to optimize analog performance externally. The DSD1794 accepts the PCM and DSD audio data formats, providing easy interfacing to audio DSP and decoder chips.

The DSD1794 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 I²C-compatible serial port.