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参数资料
| 型号： | LC708728V |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 24-BIT DAC, PDSO20 |
| 封装： | MO-150AE, SSOP-20 |
| 文件页数： | 4/31页 |
| 文件大小： | 332K |
| 代理商： | LC708728V |
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Functional Description
Overview
The LC708728V is a high-performance D/A converter designed for digital audio equipment. This IC is optimal for DVD
players, AV receivers, and other high-end audio equipment.
The LC708728V is a 2-channel high-performance stereo D/A converter that integrates digital interpolation filters, a
multibit
∑ circuit, and smoothing filters in the output stage on the same chip. In addition to including an electronic
volume control, the LC708728V also supports a variety of digital input signal formats and can be controlled over either a
2-wire or 3-wire microcontroller control interface. This microcontroller control interface can use the control signals from
industry standard microcontrollers, DSPs, and other devices directly.
The LC708728V is controlled either by hardware control (pin level settings) or software control (control over a 2-wire or
3-wire serial interface). The MODE pin (pin 16) sets the control mode. The software interface can operate
asynchronously with the audio data interface. In this case, the control data is synchronized within the IC with the
processing of audio data.
The master clock frequency can be selected from 256, 384, 512, and 768 fs. The sampling rate is selected automatically
in hardware mode, but can be controlled from the microprocessor in software mode. If an appropriate system clock is
supplied, applications can select sampling rates from under 8 ks/s to 96 ks/s. If the master clock is set to either 128 or 192
fs, a sampling rate of 192 ks/s may be selected.
The LC708728V supports right justified, left justified, I2S, and an extremely flexible DSP serial port interface as audio
data interfaces. In hardware mode, the serial control interface pins are used to select the input data format. In this case,
applications can set the input format type (I2S or right justified), the input word length (20 or 24 bits), and deemphasis
function.
A 64 fs data clock and independent bit streams for each of the left and right channels must be input in DSD mode. The bit
stream data is input to the DIN and LRCIN pins, and that data is supplied to the internal D/A converters. In hardware
mode, the SCKDSD pin (pin 19) input level controls switching between normal mode and DSD mode. See figure 4 for
details.
Additionally, DSD mode supports phase modulation. Since in this method most of the audio spectral energy is removed
from the data stream by supplying the audio data as a Manchester encoded bit stream, the digital signal corruption that
occurs during analog output can be held to a minimum. The input data is sampled with a double-speed clock (BCKIN) to
make it easier to demodulate the phase modulated data. See figure 5 for details.
This device is supplied in a miniature 20-pin SSOP package.
Clock Supply
In typical digital audio systems, there is only one clock system that is used to generate the reference clock that
synchronizes all audio data processing. This clock is usually called the master clock. In the LC708728V, a master clock
generated externally to the IC is directly supplied to the MCLK input pin, and no software settings are required to select
the sampling rate.
In this IC, MCLK is used to drive the D/A converter path. The D/A converter sampling clock, the D/A converter digital
filter clock, and the D/A converter digital audio interface timing and synchronization system are formed on the D/A
converter path. When this IC is included in systems that have multiple signal sources used for reference clocks, the clock
source with the lowest jitter must be selected to get the maximum characteristics from the D/A converters.
Since this IC only operates in slave mode, the master clock must be supplied from external circuits.
No. 7236-12/31
LC708728V
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