ES7134 데이터 시트보기 (PDF) - Unspecified
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ES7134 Datasheet PDF : 7 Pages
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Everest Semiconductor Co., Ltd.
ES7134
3. APPLICATION DESCRIPTIONS
Sampling Rate and Input Clocks
The serial audio input data is transmitted to the device at SDATA pin. According to the
sampling rate, the device can work in three speed modes, single speed, double speed and
quad speed. The device can detect the speed mode of the input data stream automatically
when the sampling rate falls into the auto detection ranges listed in Table1. If the sampling
rate is outside the auto detection ranges, the device will not work properly.
Table 1 Auto Detection Ranges and CLKIN/LRCK Ratio
MODE
Single Speed
Double Speed
Quad Speed
Fs Auto Detection Range
8kHz – 50kHz
84kHz – 100kHz
167kHz – 200kHz
CLKIN/LRCK Ratio
256, 384, 512, 768, 1024
128, 192, 256, 384, 512
128, 192, 256
The device works with the input system clock CLKIN, sample data clock LRCK and bit
clock SCLK. The data clock and bit clock must be synchronously derived from the system
clock with some specific rates. The device only supports the CLKIN/LRCK ratios listed in
Table1. The LRCK/SCLK ratio is normally 64. The device detects clock ratios automatically,
and it will not work properly if any ratio is incorrect.
Audio Data Input
The ES7134 can accept I²S serial audio input data from 16-bit to 24-bit. The device can
detect the data word length automatically. The relationship of SDATA, SCLK and LRCK for
the format is illustrated through Figures 2.
SDATA
SCLK
LRCK
1 SCLK
123
MSB
n-2 n-1 n
LSB
LEFT CHANNEL
1 SCLK
123
MSB
n-2 n-1 n
LSB
RIGHT CHANNEL
Figure 2 I²S serial audio data format up to 24-bit
Power Up and Power Down
Upon applying VDD, the device will reset itself and enter power down state. During this
state, the device clamps outputs to ground and power down the device operation except for
clock management unit. Once proper CLKIN and LRCK clocks are applied, the device will
leave power down state, and the device outputs ramp from ground to common mode voltage
softly. Then the device enters the normal operation.
Rev 1.0
3
March, 2007
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