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參數(shù)資料
| 型號(hào)： | AN504 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Video Crosspoint Switch Simplifies Large Matrix Designs |
| 中文描述： | 視頻交叉點(diǎn)開關(guān)簡(jiǎn)化大型矩陣設(shè)計(jì) |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大小： | 161K |
| 代理商： | AN504 |
AN504
Vishay Siliconix
Document Number: 70610
05-Aug-99
www.vishay.com FaxBack 408-970-5600
6-7
V+
V– GND
+V
L
IN
OUT
–5 V
10
10 F
3 x 1N4148
+15 V
+5 V
To Rest
of Circuit
10
0.1 F
DG884
0.1 F
10 F
0.1 F
FIGURE 9.
Power Supplies for DG884
5-V
Regulator
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 M or more, the distortion is
below 0.01% for audio signals at –10 dBu (0.316 V
RMS
) 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.
DG884
R
F
R
F
R
F
R
F
OUT
1
OUT
2
OUT
3
OUT
4
A
1
A
2
A
3
A
4
R
IN
R
IN
R
IN
R
IN
–
+
–
+
–
+
–
+
OUT
1
OUT
2
OUT
3
OUT
4
DIS
1
DIS
2
DIS
3
DIS
4
IN
1
IN
2
IN
3
IN
4
IN
5
IN
6
IN
7
IN
8
R
>1 M
R
>1 M
R
>1 M
R
>1 M
Inputs driven from low output impedance sources
FIGURE 10.
Audio Voltage–Mode Crosspoint
Circuit Gain
1
R
F
R
IN
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