Specifications

94 SAM0023-122898 ESS Technology, Inc.
ES1869 DATA SHEET
APPENDIX C: I
2
S ZV INTERFACE REFERENCE
The Audio Interface
The ZV Port compliant PC Card sends audio data to the
host computer using Pulse Code Modulation (PCM).
Audio data is transferred using serial I
2
S format. The audio
circuitry in the host system is primarily a PCM DAC.
The PCM audio DAC is a complete stereo digital-to-
analog system including digital-interpolation, delta-sigma
digital-to-analog conversion, digital de-emphasis and
analog filtering. Only the normal power supply decoupling
components and one resistor and capacitor per channel
for analog signal reconstruction are required.
The DAC accepts data at standard audio frequencies
including 48 kHz, 44.1 kHz, 32 kHz, and 22 kHz. Audio
data is input via the serial data input pin, SDATA. The Left/
Right Clock (LRCLK) defines the channel and delineation
of data. The Serial Clock (SCLK) clocks the audio data into
the input data buffer. The Master Clock (MCLK) is used to
operate the digital interpolation filter and the delta-sigma
modulator.
NOTE: MCLK is not required in some I
2
S designs.
Figure 36 Typical ZV Port Audio Implementation
Table 30 Common Clock Frequencies
LRCLK (KHz)
MCLK(MHz)
256x 384x
22 5.632 8.448
32 8.192 12.2880
44.1 11.2896 16.9344
48 12.2880 18.4320
Audio
Data
Processor
External
Clock
PC CARD
SDATA
SCLK
LRCLK
MCLK
AOUTR
AOUTL
GNDA
VA+
Left Audio
Output
Right Audio
Output
+5 V
0.1 µF
+10 µF
*1.0 µF
**C
600 Ω
56 kΩ
*1.0 µF
600 Ω
**C
56 kΩ
* Required for AC coupling only.
** C = 1/(2Π)(600)(IWR)(2)