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AD1843JS Datasheet(PDF) 58 Page - Analog Devices

Part # AD1843JS
Description  Serial-Port 16-Bit SoundComm Codec
PDF  64 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD1843JS Datasheet(HTML) 58 Page - Analog Devices

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REV. 0
–58–
AD1843
Good, standard engineering practices should be applied for
power-supply decoupling. Decoupling capacitors should be
placed as close as possible to package pins. If a separate analog
power supply is not available, we recommend the circuit shown
in Figure 33 for using a single +5 V supply. This circuitry
should be as close to the supply pins as is practical.
FERRITE OR
SUITABLE
INDUCTOR
1.6
Ω
VCC
0.1µF
1µF
FERRITE OR
SUITABLE
INDUCTOR
0.1µF
1µF
VCC
VCC
0.1µF
VDD
0.1µF
VDD
0.1µF
VDD
0.1µF
VDD
0.1µF
VDD
0.1µF
VDD
0.1µF
VDD
0.1µF
VDD
0.1µF
VDD
+5V
SUPPLY
0.1µF
1µF
Figure 33. AD1843 Recommended Power Supply
Bypassing
Figure 34 illustrates an optional circuit for generating the +5 V
analog supply for the AD1843. The +12 V rail available on the
ISA bus can be regulated down to +5 V using an ordinary 7805
three-terminal regulator and the bypassing and decoupling
capacitors shown. The digital supply should still be decoupled
and bypassed as shown above in Figure 33.
10µF
220nF
10µF
220nF
220nF
+12V
PC 0 V
FERRITE
BEAD
IN
OUT
GND
7805
AGND
DGND
+5VA
1µF
Figure 34. AD1843 Optional Analog Supply Regulation
Analog Devices recommends a split ground plane as shown in
Figure 35a (PQFP) and Figure 35b (TQFP). The analog plane
and the digital plane are connected directly under the AD1843.
Splitting the ground plane directly under the SoundComm
Codec is optimal because analog pins will be located above the
analog ground plane and digital pins will be located directly
above the digital ground plane for the best isolation. The digital
ground and analog ground should be tied together in the vicin-
ity of the AD1843. Other schemes may also yield satisfactory
results. If the split ground plane recommended here is not pos-
sible, the AD1843 should be entirely over the analog ground
plane.
ANALOG
GROUND
PLANE
DIGITAL
GROUND
PLANE
AD1843
50
49
10
11
PQFP
Figure 35a. AD1843 Recommended PQFP Ground Plane
ANALOG
GROUND
PLANE
DIGITAL
GROUND
PLANE
AD1843
62
61
13
14
TQFP
Figure 35b. AD1843 Recommended TQFP Ground Plane



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