Arcam RDAC - Manual de servicio - Página 9
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DAC is configured in software mode
pin 24 open sets 2-wire interface mode
pin 26 SDA input
pin 27 SCL input
pin 23 is DOUT
pin 28 sets i2c address LSB
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
I2C address = 0011 011x
+3V3
+3V3D
+5VDAC
L300
P328
600R@100MHz
IC301
200mA
WM8741GEDS
DAC_LRCK
1
DAC_LRCK
LRCLK/DSDL/DSDIN
VOUTL+
DAC_SDATA
2
DAC_SDATA
DIN/DINL
DAC_BCK
3
DAC_BCK
BCLK/DSD64CLK
VOUTL-
DAC_MCLK
5
DAC_MCLK
MCLK
VOUTR+
+3V3D
VOUTR-
26
SDA
SDIN/DEEMPH
27
SCL
SCLK/DSD
28
CSB/SADDR/I2S
VMIDL
23
IWO/DOUT
VMIDR
24
MODE/LRSEL
4
FSEL/DINR
6
DIFFHW
DAC_MUTE
25
DAC_MUTE
MUTEB/SDOUT
22
OSR/DSDR
ZFLAG
DGND
DGND
DGND
WM8741 Decoupling
1 pair per power pin
+5VDAC
+5VDAC
C322
C323
C324
C325
470UF
470UF
1UF
1UF
25V
25V
6.3V
6.3V
DGND
DGND
+5VDAC
+3V3D
C336
C338
C337
C339
470UF
1UF
10UF
100N
25V
6.3V
6.3V
16V
DGND
DGND
R300
R301
P300
1K0
560R
C302
R302
0W063
0W063
3N3
1K3
50V
0W063
C304
100P
50V
NF
DGND
R308
R309
P306
1K0
560R
C308
R311
0W063
0W063
3N3
1K3
50V
0W063
P310
17
DGND
P311
16
P312
12
P313
13
R313
R314
P314
18
P316
1K0
560R
C310
R317
0W063
0W063
3N3
1K3
11
50V
0W063
P317
C314
C315
C340
100P
10UF
100N
50V
50V
16V
NF
DGND
R324
R325
P321
21
DGND
1K0
560R
C316
C341
C320
R329
0W063
0W063
10UF
100N
3N3
1K3
50V
16V
50V
0W063
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
DGND
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.
P301
C303
1N0
P302
+5VA
100V
-5VA
IC300A
LME49722MA
3
IC302A
P304
R305
1
2
LME49722MA
2
1
1K5
3
P307
0W063
C309
-5VA
DGND
1N0
+5VA
100V
+5VA
R312
10K
0W063
P309
P325
R316
P331
10K
R320
P335
0W063
DAC_MUTE
TR303
P315
10K
BC846B
BC846B
BC846B
0W063
C311
1N0
100V
IC300B
DGND
LME49722MA
P318
5
P320
R322
7
6
IC302B
1K5
LME49722MA
P322
0W063
6
7
C321
5
1N0
100V
DGND
Op-amp Decoupling
1 pair per power pin
+5VA
+5VA
C326
C327
C328
C329
100UF
100N
100UF
100N
25V
16V
25V
16V
C331
68N
50V
DGND
C332
C333
C334
C335
100UF
100N
100UF
100N
25V
16V
25V
16V
-5VA
-5VA
Electrolytics over specified to allow for voicing changes
DRAWING TITLE
rDAC DAC and filter
Filename:
L198_CT3_DAC.SchDoc
ARCAM
Notes:
A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB25 9QR
Contact Engineer:
Peter Kuell
D300
BAT54S
+5VA
C300
10N
50V
R303
P303
2K4
C305
R304
0W063
DGND
33P
15K
C306
50V
0W063
R306
P305
R307
P329
0R0
47R
P308
R310
100UF
0W063
0W063
47K
16V
RLY300B
0W063
NAiS
DGND
TQ2-5V
R315
TR301
10K
BC856B
0W063
R318
P332
P333
1K0
P334
R319
0W063
1K0
R326
0W063
10K
TR304
0W063
BC846B
P336
R331
-5VA
1K0
0W063
R321
P319
2K4
C318
R323
0W063
33P
15K
C319
50V
0W063
R327
P323
R328
P330
0R0
47R
P324
R330
100UF
0W063
0W063
47K
16V
RLY300A
0W063
NAiS
DGND
TQ2-5V
C313
10N
-5VA
D301
50V
BAT54S
DGND
C330
68N
50V
R334
/MUTE_RLY
/MUTE_RLY
1K0
P327
0W063
10_E131
PK
14/09/10
EMC changes from Telnova
10_E122
PG
08/09/10
Change X200 to 12MHz
RLY300 changed to TQ through lead, correct D301 -5V connection.
10_E066
PK
12/04/10
Dual footprint mute transistors
ECO No.
INITIALS
DATE
DESCRIPTION OF CHANGE
Contact Tel:
(01223) 203207 tel No
Printed:
22/09/2010
Sheet
4
C301
-5VA
10N
50V
DGND
OUT_L
C342
470P
50V
C307
TR306
NSS12201
NF
1N0
100V
SKT300
3c
TR302
2SC4548
2b
TR305
DGND
2SC4548
JYE TAI
TR307
GOLD
NSS12201
C317
NF
1N0
100V
OUT_R
C343
470P
DGND
50V
Dual footprint for future package change
+5VA
C312
10N
50V
DGND
+5V
D302
RLY300C
BAS16
NAiS
TQ2-5V
P326
TR300
FMMT497
DGND
2.0
1.1
1.0
Some filter resistor value changes
ISSUE
L198CT
of
5
A3
DRAWING NO.