WM8773
24-bit, 96kHz ADC with 8 Channel I/P Multiplexer
WOLFSON MICROELECTRONICS LTD
w :: www.wolfsonmicro.com
Product Preview, April 2002, Rev 1.0
Copyright
2002 Wolfson Microelectronics Ltd.
DESCRIPTION
The WM8773 is a high performance, stereo audio ADC with
an 8 channel input selector. The WM8773 is ideal for
digitising multiple analogue sources for surround sound
processing applications for home hi-fi, automotive and other
audio visual equipment.
A stereo 24-bit multi-bit sigma delta ADC is used with an
eight stereo channel input selector. Each channel has
analogue domain mute and programmable gain control.
Digital audio output word lengths from 16-32 bits and
sampling rates from 8kHz to 96kHz are supported.
The audio data interface supports I
2
S, left justified, right
justified and DSP digital audio formats.
The device is controlled via a 3 wire serial interface. The
interface provides access to all features including channel
selection, volume controls, mutes, de-emphasis and power
management facilities. The device is available in a 64-pin
TQFP package.
FEATURES
Audio
Performance
-
102dB SNR (`A' weighted @ 48kHz) ADC
ADC Sampling Frequency: 8kHz 96kHz
3-Wire SPI MPU Serial Control Interface
Master or Slave Clocking Mode
Programmable Audio Data Interface Modes
-
I
2
S, Left, Right Justified or DSP
-
16/20/24/32 bit Word Lengths
Analogue Record Monitor Outputs
Eight stereo ADC inputs with analogue gain adjust from
+19dB to 12dB in 1dB steps
2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply
Operation
5V tolerant digital inputs
APPLICATIONS
Surround Sound AV Processors and Hi-Fi systems
Automotive
Audio
BLOCK DIAGRAM
STEREO
ADC
A
G
ND1
AVD
D
1
VM
I
D
A
D
C
AUDIO INTERFACE
AND
DIGITAL FILTERS
I
N
PU
T
SO
U
R
C
E SE
L
E
C
T
OR
AIN2R
AIN3L
AIN3R
AIN4L
AIN4R
AIN5L
AIN5R
AIN6L
AIN6R
RECL
RECR
AINOPR
AINOPL
AI
N
V
GR
AI
N
V
G
L
RE
F
A
DC
DV
DD
DG
ND
CONTROL INTERFACE
DI
CE
CL
RE
S
E
TB
AIN2L
AIN1R
AIN1L
AIN7L
AIN7R
AIN8L
AIN8R
WM8773
MUTE
ADCLRC
BCLK
DOUT
MCLK
WM8773
Product Preview
PP Rev 1.0 June 2002
2
PIN CONFIGURATION
ORDERING INFORMATION
DEVICE TEMP.
RANGE
PACKAGE
WM8773IFT/V
-40 to +85
o
C 64-pin
TQFP
AV
DD1
V
M
I
DADC
AG
ND1
NC
AI
NO
P
R
AI
NV
G
L
AI
NV
G
R
RE
CL
RE
CR
AIN1L
AIN4L
AIN3R
AIN3L
AIN2R
AIN2L
AIN1R
AIN4R
AIN5L
AIN6L
RE
S
E
TB
BCL
K
MC
L
K
CL
DI
CE
NC
NC
NC
NC
ADCL
RC
NC
NC
NC
NC
NC
NC
NC
NC
NC
1
9
8
7
6
5
4
3
2
11
10
21 22 23 24 25 26 27
18 19 20
41
40
39
38
37
36
43
42
64 63 62 61 60 59 58
17
57 56 55 54
35
34
33
AI
NO
P
L
AIN5R
RE
FADC
NC
NC
DV
DD
DO
UT
NC
53 52 51 50 49
NC
NC
NC
NC
NC
NC
AVDD2
NC
NC
AIN6R
AIN7L
AIN7R
AIN8R
14
13
12
16
15
AIN8L
NC
28 29 30 31 32
46
45
44
48
47
AGND2
DGND
Product Preview
WM8773
PP Rev 1.0 June 2002
3
PIN DESCRIPTION
PIN NAME TYPE
DESCRIPTION
1 AIN1L
Analogue
Input
Channel 1 left input multiplexor virtual ground
2 AIN1R
Analogue
Input
Channel 1 right input multiplexor virtual ground
3 AIN2L
Analogue
Input
Channel 2 left input multiplexor virtual ground
4 AIN2R
Analogue
Input
Channel 2 right input multiplexor virtual ground
5 AIN3L
Analogue
Input
Channel 3 left input multiplexor virtual ground
6 AIN3R
Analogue
Input
Channel 3 right input multiplexor virtual ground
7 AIN4L
Analogue
Input
Channel 4 left input multiplexor virtual ground
8 AIN4R
Analogue
Input
Channel 4 right input multiplexor virtual ground
9 AIN5L
Analogue
Input
Channel 5 left input multiplexor virtual ground
10 AIN5R
Analogue
Input
Channel 5 right input multiplexor virtual ground
11 AIN6L
Analogue
Input
Channel 6 left input multiplexor virtual ground
12 AIN6R
Analogue
Input
Channel 6 right input multiplexor virtual ground
13 AIN7L
Analogue
Input
Channel 7 left input multiplexor virtual ground
14 AIN7R
Analogue
Input
Channel 7 right input multiplexor virtual ground
15 AIN8L
Analogue
Input
Channel 8 left input multiplexor virtual ground
16 AIN8R
Analogue
Input
Channel 8 right input multiplexor virtual ground
17 AINOPL
Analogue
Output
Left channel multiplexor output
18 AINVGL
Analogue
Input
Left channel multiplexor virtual ground
19 AINVGR
Analogue
Input
Right channel multiplexor virtual ground
20 AINOPR
Analogue
Output
Right channel multiplexor output
21 RECL
Analogue
Output
Left channel input mux select output
22 RECR
Analogue
Output
Right channel input mux select output
23 REFADC
Analogue
Output
ADC reference buffer decoupling pin; 10uF external decoupling
24 VMIDADC
Analogue
Output
ADC midrail divider decoupling pin; 10uF external decoupling
25 AGND1 Supply
Analogue negative supply and substrate connection
26 AVDD1 Supply
Analogue positive supply
27
NC
No connection
28
NC
No connection
29
NC
No connection
30
NC
No connection
31
NC
No connection
32
NC
No connection
33 AVDD2 Supply
Analogue positive supply
34
NC
No connection
35
NC
No connection
36
NC
No connection
37
NC
No connection
38
NC
No connection
39
NC
No connection
40
NC
No connection
41
NC
No connection
42
NC
No connection
43
NC
No connection
44
NC
No connection
45
NC
No connection
46
NC
No connection
47 AGND2 Supply
Analogue negative supply and substrate connection
48 DGND Supply
Digital negative supply
49 DVDD Supply
Digital positive supply
WM8773
Product Preview
PP Rev 1.0 June 2002
4
PIN NAME TYPE
DESCRIPTION
50
NC
No connection
51
NC
No connection
52 DOUT
Digital
output
ADC data output
53
NC
No connection
54
NC
No connection
55
NC
No connection
56
NC
No connection
57
NC
No connection
58 ADCLRC
Digital
input/output
ADC left/right word clock
59 BCLK
Digital
input/output
ADC audio interface bit clock
60 MCLK
Digital
input
Master ADC clock; 256, 384, 512 or 768fs (fs = word clock frequency)
61 CL
Digital
input
Serial interface clock (5V tolerant)
62 DI
Digital
input
Serial interface data (5V tolerant)
63 CE
Digital
input
Serial interface Latch signal (5V tolerant)
64 RESETB
Digital
input
Device reset input (resets gain stages to 0dB)
(5V tolerant)
Note : Digital input pins have Schmitt trigger input buffers and are 5V tolerant.
Product Preview
WM8773
PP Rev 1.0 June 2002
5
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
CONDITION
MIN MAX
Digital supply voltage
-0.3V
+3.63V
Analogue supply voltage
-0.3V +7V
Voltage range digital inputs (DI, CL, CE & RESETB)
DGND -0.3V
+7V
Voltage range digital inputs (MCLK, ADCLRC & BCLK)
DGND -0.3V
DVDD + 0.3V
Voltage range analogue inputs
AGND -0.3V
AVDD +0.3V
Master Clock Frequency
37MHz
Operating temperature range, T
A
-40
C +85
C
Storage temperature
-65
C +150
C
Package body temperature (soldering 10 seconds)
+240
C
Package body temperature (soldering 2 minutes)
+183
C
Notes:
1.
Analogue and digital grounds must always be within 0.3V of each other.
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