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參數(shù)資料
| 型號(hào)： | DG884DN-E3 |
| 廠商： | Vishay Siliconix |
| 文件頁(yè)數(shù)： | 4/14頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEO MULTIPLEXER 8X4 |
| 標(biāo)準(zhǔn)包裝： | 300 |
| 功能： | 視頻交叉點(diǎn)開(kāi)關(guān) |
| 電路： | 1 x 8:4 |
| 導(dǎo)通狀態(tài)電阻： | 90 歐姆 |
| 電壓電源： | 單/雙電源 |
| 電壓 - 電源，單路/雙路(±)： | 10 V ~ 18 V，±10 V ~ 15 V |
| 電流 - 電源： | 1.5mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 44-PLCC（16.59x16.59） |
| 包裝： | 管件 |
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www.vishay.com
12
Document Number: 70071
S-71241–Rev. H, 25-Jun-07
Vishay Siliconix
DG884
APPLICATIONS
Power Supplies and Decoupling
A useful feature of the DG884 is its power supply flexibility. It
can be operated from dual supplies, or a single positive
supply (V- connected to 0 V) if required. Allowable operating
voltage ranges are shown in Operating Voltage Range
(Typical Characteristics) graph, page 6.
Note that the analog signal must not go below V- by more
than 0.3 V (see absolute maximum ratings). However, the
addition of a V- pin has a number of advantages:
1)
It allows flexibility in analog signal handling, i.e. with
V- = - 5 V and V+ = 15 V, up to ± 5 V ac signals can
be accepted.
2)
The value of on-capacitance [CS(on)] may be reduced
by increasing the value of V-. It is useful to note that
optimum video differential phase and gain occur
when V- is - 3 V. Note that V+ has no effect on CS(on).
3)
V- eliminates the need to bias an ac analog signal
using
potential
dividers
and
large
decoupling
capacitors.
It is established RF design practice to incorporate sufficient
bypass capacitors in the circuit to decouple the power
supplies to all active devices in the circuit. The dynamic
performance of the DG884 is adversely affected by poor
decoupling of power supply pins. Also, since the substrate of
the device is connected to the negative supply, proper
decoupling of this pin is essential.
Rules:
1)
Decoupling capacitors should be incorporated on all
power supply pins (V+, V-, VL).
2)
They should be mounted as close as possible to the
device pins.
3)
Capacitors
should
have
good
high
frequency
characteristics - tantalum bead and/or monolithic
ceramic disc types are suitable.
Recommended decoupling capacitors are 1
to 10 F
tantalum bead, in parallel with 100 nF monolithic ceramic.
4)
Additional high frequency protection may be provided
by 51
Ω carbon film resistors connected in series with
the power supply pins (see Figure 14).
The VL pin permits interface to various logic types. The
device is primarily designed to be TTL or CMOS logic
compatible with + 5 V applied to VL. The actual logic
threshold can be raised simply by increasing VL.
Figure 14. DG884 Power Supply Decoupling
DG884
+ 5 V
+ 15 V
3 V
+
++
V
V+
C2
C1
C2
51
Ω
51
Ω
51
Ω
C1
C2
C1 = 1 F Tantalum
C2 = 100 nF Ceramic
VL
Figure 15. Switching Threshold Voltage vs. VL
6
5
4
3
2
1
0
246
8
10
12
14
16
18
–
Logic
Threshold
(V)
V
th
VL – Logic Supply (V)
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