Features: ·Complete EIAJ CP1201, IEC-60958, AES3, S/PDIF compatible transceiver
·+5 V Analog Supply (VA)
·+3 V to +5 V Digital Supply (VL)
·Flexible 3-wire serial digital I/O ports
·Adjustable sample rate up to 96 kHz
·Low jitter clock recovery
·Pin and microcontroller read/write access to Channel Status and User data
·Microcontroller and standalone modes
·Differential cable driver and receiver
·On-chip Channel Status and User data buffer memories permit block reads & writes
·OMCK System Clock Mode
·Decodes Audio CD Q sub-codeApplicationWhenRST is low, the CS8427 enters a low power mode and all internal states are reset, including the control port and registers, and the outputs are muted. WhenRST is high, the control port becomes operational and the desired settings should be loaded into the control registers. Writing a 1 to the RUN bit will then cause the part to leave the low power state and begin operation. After the PLL has settled, the AES3 and serial audio outputs will be enabled.
Some options within the CS8427 are controlled by a start-up mechanism. During the reset state, some of the output pins are reconfigured internally to be inputs. Immediately upon exiting the reset state, the level of these pins is sensed. The pins are then switched to be outputs. This mechanism allows output pins to be used to set alternative modes in the CS8427 by connecting a 47kΩ resistor to between the pin and either VL+ (HI) or DGND (LO). For each mode, every start-up option select pin MUST have an external pull-up or pull-down resistor. In software mode, the only start-up option pin isEMPH, which is used to set a chip address bit for the control port in Two-Wire mode. Hardware modes use many start-up options, which are detailed in the hardware definition section at the end of this data sheet.
Pinout
Specifications
|
Parameter |
Symbol |
Min |
Max
|
Units |
| Power Supply Voltage |
VL+,VA+ |
- |
6.0
|
V |
| Input Current, Any Pin Except Supply (Note 3) |
Iin |
- |
±10 |
mA |
| Input Voltage |
Vin |
-0.3 |
(VL+) + 0.3 |
V |
| Ambient Operating Temperature (power applied) |
TA |
-55 |
125 |
|
| Storage temperature |
Tstg |
-65 |
150 |
|
Notes: 3. Transient currents of up to 100 mA will not cause SCR latch-up.
DescriptionThe CS8427 is a stereo, digital audio transceiver with AES3 and serial digital audio inputs and outputs, along with comprehensive control through a 4-wire microcontroller port. Channel status and user data are assembled in block-sized buffers, making read/modify/write cycles easy.
A low-jitter clock-recovery mechanism CS8427 yields a very clean recovered clock from the incoming AES3 stream.
Target applications include audio/video receivers, CD-R, DVD receivers, multimedia speakers, digital mixing consoles, effects processors, set-top boxes, computers and automotive audio systems.
CS8427 Data Sheet
