SM5849F Datasheet, PDF (14/26 Pages) Nippon Precision Circuits Inc – Asynchronous Sample Rate Converter

SM5849AF
FUNCTIONAL DESCRIPTION
Input Data Interface (DI, LRCI, BCKI, IFM1, IFM2, IWL1, IWL2)
Table 1. Input data format (IFM1, IFM2, IWL1, IWL2)
Mode
1
2
3
4
5
6
7
8
9
10
11
12
IFM1
LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH
HIGH
IFM2
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
IWL1
LOW
HIGH
LOW or HIGH
IWL2
LOW
LOW
HIGH
W ord length Data position
16 bits
20 bits
24 bits
Right justified
Right justified
Left justified
IIS
Right justified
Right justified
Left justified
IIS
Right justified
Right justified
Left justified
IIS
Data
sequence
MSB first
LSB first
MSB first
MSB first
MSB first
LSB first
MSB first
MSB first
MSB first
LSB first
MSB first
MSB first
Attenuator and Deemphasis Selection
The attenuator is set using the microcontroller inter-
face. When the attenuator is used, deemphasis set-
tings also need to be set using the microcontroller
interface. The microcontroller interface comprises
MDT, MCK and MLEN, and is used to transfer all
input serial data.
Table 2. Attenuator and deemphasis function select
Function
Deemphasis ON/OFF
Deemphasis frequency (fsi) select
Attenuator data set
Test mode select
Function set method
External pins
(MCOM = LOW)
Microcontroller interface
(MCOM = HIGH)
DEEM
FDEEM
FSI1, FSI2
FFSI1, FFSI2
N/A (no attenuation)
11 bits (B0 to B10)
N/A (test mode 1)
FTST1, FTST2
MCON should not be switched after a power-ON
reset.
When MCOM is HIGH, serial data received on
MDT, MCK and MLEN sets the attenuation data and
control flag data.
When MCOM is LOW, the logic levels on FSI1,
FSI2 and DEEM select the device function.
NIPPON PRECISION CIRCUITS—14