ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No.
DESCRIPTION OF CHANGE
L198_CT3_DAC.SchDoc
rDAC DAC and filter
Contact Engineer:
L198CT
22/09/2010
INITIALS
Printed:
4
5
Sheet
of
Notes:
Contact Tel:
(01223) 203207 tel No
Peter Kuell
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB25 9QR
Waterbeach
A3
ARCAM
CSB/SADDR/I2S
28
D
V
D
D
8
D
G
N
D
7
LRCLK/DSDL/DSDIN
1
BCLK/DSD64CLK
3
DIN/DINL
2
DIFFHW
6
MCLK
5
OSR/DSDR
22
VOUTL+
17
FSEL/DINR
4
VOUTR+
12
MODE/LRSEL
24
A
G
N
D
L
1
9
ZFLAG
21
VOUTL-
16
VMIDL
18
VOUTR-
13
A
V
D
D
R
9
A
G
N
D
R
1
0
VMIDR
11
SCLK/DSD
27
IWO/DOUT
23
MUTEB/SDOUT
25
SDIN/DEEMPH
26
A
V
D
D
L
2
0
A
G
N
D
1
4
A
V
D
D
1
5
IC301
WM8741GEDS
DGND
WM8741 Decoupling
1 pair per power pin
DAC_SDATA
DAC_LRCK
DAC_BCK
DAC_MCLK
DGND
DGND
DGND
DGND
DGND
+5VDAC
50V
C315
10UF
50V
C316
10UF
DGND
pin 26 SDA input
50V
C304
100P
NF
DGND
DGND
50V
C305
33P
0W063
R310
47K
DGND
0W063
R307
47R
+5VA
+5VA
-5VA
-5VA
50V
C314
100P
NF
DGND
DGND
DGND
50V
C318
33P
0W063
R330
47K
DGND
0W063
R328
47R
16V
C329
100N
16V
C335
100N
DGND
+5VA
-5VA
50V
C331
68N
16V
C327
100N
16V
C333
100N
DGND
+5VA
-5VA
50V
C330
68N
Op-amp Decoupling
1 pair per power pin
DGND
D300
BAT54S
+5VA
-5VA
50V
C301
10N
50V
C300
10N
DGND
DGND
D301
BAT54S
+5VA
-5VA
50V
C313
10N
50V
C312
10N
DGND
DGND
DGND
If using WM8741 DAC - Filter values:
R(in) = 5k6
R(fb) = 7k5
R(ff) = 3k3
C(in) = 560p
C(fb) = 180p
2nd order Bessel filter characteristics (from simulation):
-3dB = 78.5kHz
@20kHz = -0.175dB
@1MHz = -40.0dB
passband gain = +2.54dB
passband out level = 2.128Vrms (5.0V DAC supply)
passband out level = 2.341Vrms (5.5V DAC supply)
Group delay passband = 2.7724uS
Group delay delta = -2.0238nS
Inverting input load (min) = 3.56k
Special note about WM8741:
With non-emphasised audio data, DAC can internally
reduce gain by 2dB before the digital filter to reduce disc
clipping artefacts. Analogue filter has gain to compensate
for this.
Electrolytics over specified to allow for voicing changes
+5VDAC
+5VDAC
+5VDAC
+5V
/MUTE_RLY
DAC_BCK
DAC_LRCK
DAC_SDATA
DAC_MCLK
/MUTE_RLY
SDA
SCL
DGND
DGND
I2C address = 0011 011x
pin 27 SCL input
pin 24 open sets 2-wire interface mode
pin 28 sets i2c address LSB
pin 23 is DOUT
pin 4 unused, leave hi z
pin 6 low sets non differential mode
pin 25 high sets mute off
pin 22 unused, leave hi z
DAC_MUTE
DAC_MUTE
D302
BAS16
2b
1
a
3c
GOLD
SKT300
JYE TAI
OUT_L
OUT_R
TR300
FMMT497
P310
P311
P312
P313
P317
P316
P300
P306
P314
P321
P301
P307
P315
P322
P320
P304
P302
P318
P303
P305
P319
P323
P308
P324
P326
P327
200mA
L300
600R@100MHz
+3V3
+3V3D
+3V3D
16V
C340
100N
16V
C341
100N
DGND
100V
C307
1N0
100V
C317
1N0
0W063
R334
1K0
DAC is configured in software mode
+3V3D
P330
P329
P328
2
3
1
8
4
IC300A
LME49722MA
6
5
7
IC300B
LME49722MA
6.3V
C324
1UF
6.3V
C325
1UF
6.3V
C338
1UF
6.3V
C337
10UF
16V
C306
100UF
16V
C319
100UF
2
3
1
8
4 IC302A
LME49722MA
6
5
7
IC302B
LME49722MA
0W063
R300
1K0
0W063
R308
1K0
0W063
R313
1K0
0W063
R324
1K0
0W063
R302
1K3
0W063
R311
1K3
0W063
R317
1K3
0W063
R329
1K3
0W063
R301
560R
0W063
R309
560R
0W063
R314
560R
0W063
R325
560R
100V
C303
1N0
100V
C309
1N0
100V
C311
1N0
100V
C321
1N0
TR302
2SC4548
TR305
2SC4548
DGND
0W063
R319
1K0
0W063
R331
1K0
0W063
R326
10K
TR301
BC856B
0W063
R318
1K0
0W063
R315
10K
+5VA
TR304
BC846B
DGND
0W063
R316
10K
BC846B
BC846B
TR303
BC846B
0W063
R320
10K
0W063
R312
10K
DAC_MUTE
16V
C339
100N
25V
C322
470UF
25V
C323
470UF
25V
C336
470UF
P335
P325
P309
P331
P334
P332
P333
P336
50V
C302
3N3
50V
C308
3N3
50V
C310
3N3
50V
C320
3N3
-5VA
PK
12/04/10
RLY300 changed to TQ through lead, correct D301 -5V connection.
1.0
10_E066
Dual footprint for future package change
25V
C326
100UF
25V
C332
100UF
25V
C328
100UF
25V
C334
100UF
TR306
NSS12201
TR307
NSS12201
Dual footprint mute transistors
NF
NF
0W063
R303
2K4
0W063
R321
2K4
0W063
R304
15K
0W063
R323
15K
0W063
R306
0R0
0W063
R327
0R0
Some filter resistor value changes
0W063
R305
1K5
0W063
R322
1K5
TQ2-5V
RLY300A
NAiS
TQ2-5V
RLY300B
NAiS
TQ2-5V
RLY300C
NAiS
PG
08/09/10
Change X200 to 12MHz
1.1
10_E122
PK
14/09/10
EMC changes from Telnova
2.0
10_E131
50V
C342
470P
50V
C343
470P
All manuals and user guides at all-guides.com
