2 functional changes, An259, Cs4382a – Cirrus Logic AN259 User Manual
Page 3: Cs4382
AN259
AN259REV2
3
Location or function changes as denoted in Figure 1 are as follows:
•
The CS4385 does not support the simultaneous synchronous sample rate function of the CS4382. Pins 10
and 12 are now Test inputs.
Pins which require changes to external components or voltages as denoted in Figure 2 are as follows:
•
Pin 4 (VD) requires 2.5 V for recommended operation. The CS4382 used either 3.3 V or 5 V, which, if left
unchanged, would damage the CS4382A.
•
Pin 22 (MUTEC234) and pin 41 (MUTEC1) require an additional pull-up or down in order to mute during
reset. While reset is asserted these pins are high impedance and will not drive the mute circuitry. It is
recommended that the pull-up/down resistance properly biases the off-chip mute circuit into muting.
•
Pins 23 - 30, 33 - 40 (AOUTs) have a new recommended filter circuit. This filter uses the same filter topology
as the CS4382. The component values have been changed to account for the extra output level from the
CS4382A and still provide 2 Vrms on the output. A general optimization was also made in order to reduce
the thermal noise contribution of the resistances (using smaller resistances where possible). Please refer to
the CS4382A datasheet for details on the new recommended filter.
2.1.2
Functional changes
-
With the addition of the non-decimating DSD processor mode comes the added benefits of
matched PCM and DSD output levels and an on chip 50 kHz filter.
-
The CS4382A uses a new multi-bit Delta-Sigma modulator core with mis-match shaping which al-
lows for lower over-all out-of-band noise and improved audio quality.
-
The CS4382A gained new digital filters with improved stop-band performance and lower latency.
-
The full scale differential output voltage has increased which needs to be accounted for in the an-
SDI
N
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)
DSDB3
DSDA3
DS
DA4
CS4382
DS
DB4
VL
S
SD
IN
4
M2
(S
CL
/CCL
K)
M
1
(SDA/CDIN)
VL
C
RS
T
FILT+
VQ
MUTEC2
3
4
M0(
A
D
0
/C
S
)
AOUTA2+
AOUTA2-
AO
U
T
B
1
+
AO
UT
B1
-
AO
UT
A1
-
AO
U
T
A1+
DS
DB2
MUTE
C1
AOUTA4-
AOUTA4+
AO
U
T
B4+
AO
U
T
B
4
-
= denotes location or function changes
when trasitioning to CS4382A
Figure 1. CS4382 pinout
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
TST
DSDA2
DSDA1
GND
SCLK1
SDIN2
TST
LRCK1(DSD_EN)
M3(DSD_SCLK)
DS
DB
3
DS
D
A
3
DSDA4
CS4382A
DSDB4
VLS
SD
IN
4
M2
(S
C
L
/C
CL
K
)
M1(
S
D
A
/CDI
N)
VLC
RST
FI
LT
+
VQ
MUT
E
C2
3
4
M0(AD
0
/C
S
)
AOUTA2+
AOUTA2-
AO
U
T
B1+
AOUT
B1-
AO
U
T
A1-
AOUTA1+
DSDB2
MUT
E
C
1
AOUTA4-
AOUTA4+
AOUTB4+
AO
UT
B
4
-
= denotes pins which require changes
to components or voltages
Figure 2. CS4382A pinout