PCM1791A屬于集成電路（IC）的ADC/DAC-特殊用途。由美國德州儀器公司制造生產(chǎn)的PCM1791AADC/DAC - 特殊用途該產(chǎn)品族中的產(chǎn)品可用于模擬和數(shù)字表示的信息轉(zhuǎn)換，適用于特定用例，或集成了通用數(shù)據(jù)轉(zhuǎn)換器中不常見的其他功能。例如針對超聲或汽車雷達應(yīng)用集成了低噪聲放大器和可變增益級的器件、注重音頻和視頻的產(chǎn)品、在段碼式顯示器上集成顯示測量值功能的器件、集成輸入輸出電氣隔離的器件等。

FEATURES

24-Bit Resolution

Analog Performance:

? Dynamic Range: 113 dB

? THD+N: 0.001%

? Full-Scale Output: 2.1 V RMS (at Postamp)

Differential Voltage Output: 3.2 Vp-p

8× Oversampling Digital Filter:

? Stop-Band Attenuation: –82 dB

? Pass-Band Ripple: ±0.002 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

DSD Format Interface Available

Optional Interface to External Digital Filter or

DSP Available

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/PCM and DSD

Formats

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

DESCRIPTION

The PCM1791A 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 PCM1791A

provides balanced voltage outputs, allowing the user to

optimize analog performance externally. The PCM1791A

accepts PCM and DSD audio data formats, providing easy

interfacing to audio DSP and decoder chips. The

PCM1791A also accepts interface to 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 PCM1791A also supports the time-divisionmultiplexed

command and audio (TDMCA) data format.