AN504 데이터 시트보기 (PDF) - Vishay Semiconductors
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AN504 Datasheet PDF : 12 Pages
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+15 V
10 W
10 mF
0.1 mF
V+
+VL
DG884
V– GND
10 mF 0.1 mF
10 W
IN
OUT
5-V
Regulator
+5 V
To Rest
of Circuit
0.1 mF
3 x 1N4148
–5 V
FIGURE 9. Power Supplies for DG884
AN504
Vishay Siliconix
Audio Operation
While the DG884 was designed for wide bandwidth
applications, its excellent crosstalk and isolation specifications
resulting from the T-switch configuration, together with the high
level of integration (four 8-channel multiplexers in one
package), make the part very attractive for audio applications.
Used with load resistors of 1 MW or more, the distortion is
below 0.01% for audio signals at –10 dBu (0.316 VRMS) level
when powered from +12 V and –5 V supplies. The high value
load resistors can cause excessive levels of noise at the output
amplifier when the crosspoint is disabled. This can be reduced
by using the DISABLE outputs of the crosspoint to shunt the
high value load resistors to ground during disable mode.
Layout Considerations
As with all high-frequency work, good PCB layout practice is
essential if the inherent device performance is not to be
degraded. Maximum ground plane area ensures that circuit ac
ground really has low impedance. The inter-channel ground
pins of the DG884 provide essential screening between
channels right to the silicon, as well as separate return paths
for each input. Thus input crosstalk is doubly improved. Similar
considerations apply for the output inter-channel grounds.
Inputs driven from low output impedance sources
OUT1
OUT2
OUT3
OUT4
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
DG884
DIS1
DIS2
DIS3
DIS4
RL
>1 MW
RL
>1 MW
RIN
RF
–
+
A1
OUT1
RIN
RIN
RIN
RL
>1 MW
RL
>1 MW
RF
–
+
A2
RF
OUT2
–
+
A3
RF
OUT3
–
+
A4
OUT4
Circuit
Gain
+
1
)
RF
RIN
Document Number: 70610
05-Aug-99
FIGURE 10. Audio Voltage–Mode Crosspoint
www.vishay.com S FaxBack 408-970-5600
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