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參數(shù)資料
| 型號(hào)： | DG884DN-E3 |
| 廠(chǎng)商： | Vishay Siliconix |
| 文件頁(yè)數(shù)： | 2/14頁(yè) |
| 文件大小： | 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(xiàn)） |
| 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
10
Document Number: 70071
S-71241–Rev. H, 25-Jun-07
Vishay Siliconix
DG884
DEVICE DESCRIPTION
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 A0 through A3 to
define the IN line and address B0 and B1 to define the OUT
line. That is, The IN defined by A0 through A3 is electrically
connected to the OUT defined by B0, B1. 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.
PIN DESCRIPTION
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
VL
Logic Supply Voltage - generally 5 V
5, 7, 9, 11, 13, 15, 17, 19
IN1 to IN8
8 Analog Input Channels
2, 40, 42, 44
OUT1 to OUT4
4 Analog Output Channels
29
I/O
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, 33, 34
A0, A1, A2, A3
IN Address - logic inputs or outputs as defined by I/O pin, select one of eight IN channels
27, 28
B0, B1
OUT Address - logic inputs, select one of four OUT channels
35
WR
Write command that latches A0, A1, A2, A3 into the Next Event latches
36
SALVO
Master write command, that in one action, transfers all the data from Next Event latches
into Current Event latches
37
RS
Reset - a low will clear the Current Event latches
22, 23, 24, 25
DIS1 to DIS4
Open drain disable outputs - these outputs pull low when the corresponding OUT channel
is off
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