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参数资料
| 型号： | DG884 |
| 厂商： | Vishay Intertechnology,Inc. |
| 英文描述： | 8 x 4 Wideband Video Crosspoint Array(8 x 4宽带视频交叉开关) |
| 中文描述： | 8 × 4交叉点阵列宽带视频（8 × 4宽带视频交叉开关） |
| 文件页数： | 10/13页 |
| 文件大小： | 121K |
| 代理商： | DG884 |
DG884
Vishay Siliconix
www.vishay.com
10
Document Number: 70071
S-52433
—
Rev. F, 06-Sep-99
Pin
Symbol
Description
1, 3, 4, 6, 8, 10, 12, 14, 16,
18, 20, 41, 43
GND
Analog Signal Ground
39
DGND
Digital Ground
26
V+
Positive Supply Voltage
21
V
–
Negative Supply Voltage
38
V
L
Logic Supply Voltage
—
generally 5 V
5, 7, 9, 11, 13, 15, 17, 19
IN
1
to IN
8
OUT
1
to OUT
4
I/O
8 Analog Input Channels
2, 40, 42, 44
4 Analog Output Channels
29
Determines whether data is being written into the Next Event latches or read from the Current Event latches
30
CS
Chip Select
—
a logic input
31, 32, 22, 24
A
0
, A
1
, A
2
, A
3
B
0
, B
1
WR
IN Address
—
logic inputs or outputs as defined by I/O pin, select one of eight IN channels
27, 28
OUT Address
—
logic inputs, select one of four OUT channels
35
Write command that latches A
0
, A
1
, A
2
, A
3
into the Next Event latches
Master write command, that in one action, transfers all the data from Next Event latches into
Current Event latches
36
SALVO
37
RS
Reset
—
a low will clear the Current Event latches
22, 23, 24, 25
DIS
1
to DIS
4
Open drain disable outputs
—
these outputs pull low when the corresponding OUT channel is off
The DG884 is the world
’
s first monolithic wideband crosspoint
array that operates from dc to >100 MHz. The DG884 offers
the ability to route any one of eight input signals to any one of
four OUT pins. Any input can be routed to one, two, three or
four OUTs simultaneously with no risk of shorting inputs
together (guaranteed by design).
Each crosspoint is configured as a
“
T
”
switch in which DMOS
FETs are used due to their excellent low resistance and low
capacitance characteristics. Each OUT line has a series
switch that minimizes capacitive loading when the OUT is off.
Interfacing
The DG884 was designed to allow complex matrices to be
developed while maintaining a simple control interface. The
status of the I/O pin determines whether the DG884 is being
written to or read from (see Figures 1 and 2).
In order to WRITE to an individual latch, CS and I/O need to
be low, while RS, WR and SALVO must be high. The IN to OUT
path is selected by using address A
0
through A
3
to define the
IN line and address B
0
and B
1
to define the OUT line. That is,
The IN defined by A
0
through A
3
is electrically connected to the
OUT defined by B
0
, B
1
. This chosen path is loaded into the
Next Event latches when WR goes low and returns high again.
This operation is repeated up to three more times if other
crosspoint connections need to be changed.
Upon completing all crosspoint connections that are to be
changed in a single device, other DG884s can be similarly
preset by taking the CS pin low on the appropriate device.
When all DG884s are preset, the Current Event latches are
simultaneously changed by a single SALVO command applied
to all devices. In this manner the crosspoint configuration of
any number of devices can be simultaneously updated.
DIS Outputs
Four open drain disable OUTs are provided to control external
line drivers or to provide visual or electrical signaling. For
example, any or all of the DIS OUTs can directly interface with
a CLC410 Video Amplifier to place it into a high impedance,
low-power standby mode when the corresponding OUT is not
being used. (See Figure 15). The DIS outputs are low and sink
to V
–
when corresponding OUT is open or RS is low.
Reset
The reset function (RS) allows the resetting of all crosspoints
to a known state (open). At power up, the reset facility may be
used to guarantee that all switches are open. It should be
noted that RS clears the Current Event latches, but the Next
Event latches remain unchanged. This useful facility allows
the user to return the matrix to its previous state (prior to reset)
by simply applying the SALVO command. Alternatively, the
user can reprogram the Next Event latches, and then apply the
SALVO command to reconfigure the matrix to a new state.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DG884_08 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:8 x 4 Wideband Video Crosspoint Array |
| DG884AM | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:8 x 4 Wideband Video Crosspoint Array |
| DG884AM/883 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:8 x 4 Wideband Video Crosspoint Array |
| DG884AM/883C | 制造商: 功能描述: 制造商:undefined 功能描述: |
| DG884AM883 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:8 x 4 Wideband Video Crosspoint Array |
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