Cirrus Logic AN260 - Manual (Page 4)

AN260
4 AN260REV2
alog filter gain (if similar output level to the CS4362 is desired).
- The mute control pins are high impedance while reset is asserted. An external pull-up or down is
required to properly bias the off-chip mute circuitry into muting during reset.
- The dual serial port function of the CS4362 which accepted two simultaneous synchronous sam-
ple rates (such as 192 kHz front and 96 kHz surrounds) is not supported.
2.2 Transitioning from the CS4362 to CS4365
2.2.1 Hardware changes
The CS4365 pinout was primarily based on the CS4362 with only 3 pins changing function. Oth-
er pins have new recommended components but the circuit topologies remain the same and
thus do not require modification to the PCB. The most significant change is that the VD core of
the CS4365 requires 2.5 V for operation, whereas the CS4362 was able to run from 3.3 V to
5 V. The CS4365 will NOT operate off of a VD supply of 3.3 V or 5 V.
Figure 3 and Figure 4 show the CS4362 and CS4365 pinouts respectively. The changes to the
two pinouts are highlighted. Figure 3 highlights the pins which have changed function and which
may require a PCB change. Figure 4 highlights the pins which have new recommended com-
ponents.
Location or function changes as denoted in Figure 3 are as follows:
• Pin 7 is no longer DSD_EN in hardware mode. In order to enter DSD mode on the CS4365 you must either
set the M4 and M3 pins accordingly or use SPI™ or I
2
C configuration.
• The CS4365 does not support the simultaneous synchronous sample rate function of the CS4362. Pins 10
and 12 are now dedicated for stand-alone configuration (voltage input on these pins are still referenced to
VLS).
SD
IN
3
GND
AOUTB2-
AOUTA3+
AOUTB3-
AOUTB2+
VA
AOUTA3-
AOUTB3+
6
2
4
8
10
1
3
5
7
9
11
12
13 14 15 16 17 18 19 20 21 22 23 24
31
35
33
29
27
36
34
32
30
28
26
25
48 47 46 45 44 43 42 41 40 39 38 37
MCLK
DSDB1
VD
SDIN1
LRCK2
DSDA2
DSDA1
GND
SCLK1
SDIN2
SCLK2
LRCK1(DSD_EN)
M3
(D
SD
_
S
CL
K
)
DS
DB3
DS
DA3
TS
T
CS4362
TS
T
VL
S
TS
T
M
2
(S
CL
/C
CL
K)
M1
(S
DA/C
DIN) VLC RS
T
FIL
T
+
VQ
MUTE
C6
M0(
A
D
0
/C
S
)
AOUTA2+
AOUTA2-
AO
UT
B
1
+
AOU
T
B
1
-
AOU
T
A
1
-
AO
UT
A
1
+
DSD
B
2
MUTE
C1
MUTEC2
MUTEC3
MUTE
C4
MUTE
C5
= denotes location or function changes
when trasitioning to CS4365
Figure 3. CS4362 pinout
SD
IN
3
GND
AOUTB2-
AOUTA3+
AOUTB3-
AOUTB2+
VA
AOUTA3-
AOUTB3+
MUTEC2
MUTEC3
6
2
4
8
10
1
3
5
7
9
11
12
13 14 15 16 17 18 19 20 21 22 23 24
31
35
33
29
27
36
34
32
30
28
26
25
48 47 46 45 44 43 42 41 40 39 38 37
MCLK
DSDB1
VD
SDIN1
M4
DSDA2
DSDA1
GND
SCLK
SDIN2
M3
LRCK
DS
D
_
SC
L
K
DS
D
B
3
DS
D
A
3
TST
CS4365
TST VLS
TST
M
2
(S
CL
/C
CL
K
)
M
1
(S
D
A
/C
DI
N)
VLC RS
T
FI
L
T
+
VQ
MUTEC
6
MU
TEC5
MUTEC
4
M0(AD
0
/C
S)
AOUTA2+
AOUTA2-
AOU
T
B1+
AOU
T
B1-
AOUTA
1
-
AOUTA
1
+
DS
DB2
MUTEC
1
= denotes pins which require changes
to components or voltages
Figure 4. CS4365 pinout