參數(shù)資料
型號(hào)： AD8108ASTZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 14/33頁(yè)
文件大?。?/td> 0K
描述： IC VIDEO CROSSPOINT SWIT 80LQFP
標(biāo)準(zhǔn)包裝： 1
功能： 視頻交叉點(diǎn)開關(guān)
電路： 1 x 8:8
電壓電源： 雙電源
電壓 - 電源，單路/雙路(±)： ±4.5 V ~ 5.5 V
電流 - 電源： 33mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 80-LQFP
供應(yīng)商設(shè)備封裝： 80-LQFP（12x12）
包裝： 托盤
AD8108/AD8109
Rev. B | Page 20 of 32
CREATING LARGER CROSSPOINT ARRAYS
The AD8108/AD8109 are high density building blocks for creating
crosspoint arrays of dimensions larger than 8 × 8. Various features,
such as output disable, chip enable, and gain-of-1 and-2 options,
are useful for creating larger arrays. For very large arrays, they
can be used along with the AD8116, a 16 × 16 video cross-point
device. In addition, systems that require more inputs than
outputs can use the AD8110 and/or the AD8111, which are
(gain-of-1 and gain-of-2) 16 × 8 crosspoint switches.
The first consideration in constructing a larger crosspoint is to
determine the minimum number of devices required. The 8 × 8
architecture of the AD8108/AD8109 contains 64 points, which
is a factor of 16 greater than a 4 × 1 crosspoint. The PC board
area and power consumption savings are readily apparent when
compared to using these smaller devices.
For a nonblocking crosspoint, the number of points required is
the product of the number of inputs multiplied by the number
of outputs. Nonblocking requires that the programming of a
given input to one or more outputs does not restrict the
availability of that input to be a source for any other outputs.
Some nonblocking crosspoint architectures will require more than
this minimum as calculated above. Also, there are blocking archi-
tectures that can be constructed with fewer devices than this
minimum. These systems have connectivity available on a statis-
tical basis that is determined when designing the overall system.
The basic concept in constructing larger crosspoint arrays is to
connect inputs in parallel in a horizontal direction and to wire-
OR the outputs together in the vertical direction. The meaning
of horizontal and vertical can best be understood by looking at
a diagram.
An 8 input by 16 output crosspoint array can be constructed as
shown in Figure 48. This configuration parallels two inputs per
channel and does not require paralleling of any outputs. Inputs are
easier to parallel than outputs because there are lower parasitics
involved. For a 16 × 8 crosspoint, the AD8110 (gain of 1) or
AD8111 (gain of 2) device can be used. These devices are
already configured into a 16 × 8 crosspoint in a single device.
8 INPUTS
IN 00–07
16 OUTPUTS
OUT 00–15
ONE
TERMINATION
PER INPUT
8
AD8108
OR
AD8109
AD8108
OR
AD8109
01068-048
Figure 48. 8 × 16 Crosspoint Array Using Two AD8108s (Unity Gain) or Two
AD8109s (Gain of 2)
Figure 49 illustrates a 16 × 16 crosspoint array, while a 24 × 24
crosspoint is illustrated in Figure 50. The 16 × 16 crosspoint
requires that each input driver drive two inputs in parallel and
each output be wire-OR’ed with one other output. The 24 × 24
crosspoint requires driving three inputs in parallel and having
the outputs wire-OR’ed in groups of three. It is required of the
system programming that only one output of a wired-OR node
be active at a time.
IN 00–07
00–07
08–15
IN 08–15
OUT 00–07
OUT 08–15
8
RTERM
8
× 8
8
× 8
8
× 8
8
× 8
01068-049
Figure 49. 16 × 16 Crosspoint Array Using Four AD8108s or AD8109s
IN 00–07
IN 08–15
IN 16–23
OUT 16–23
OUT 08–15
OUT 00–07
RTERM
8
× 8
8
× 8
8
× 8
8
× 8
8
× 8
8
× 8
8
× 8
8
× 8
8
× 8
RTERM
8
01068-050
Figure 50. 24 × 24 Crosspoint Array Using Nine AD8108s or AD8109s
At some point, the number of outputs that are wire-OR’ed
becomes too great to maintain system performance. This will
vary according to which system specifications are most
important. For example, a 64 × 8 crosspoint can be created with
eight AD8108/AD8109s. This design will have 64 separate
inputs and have the corresponding outputs of each device wire-
OR’ed together in groups of eight.
相關(guān)PDF資料
PDF描述
AD8110ASTZ IC VIDEO CROSSPOINT SWIT 80LQFP
AD8112JSTZ IC CROSSPOINT SWIT 16X8 100LQFP
AD8113JSTZ IC VIDEO CROSSPOINT SWIT 100LQFP
AD8114ASTZ IC VIDEO CROSSPOINT SWIT 100LQFP
AD8116JSTZ IC VIDEO CROSSPOINT SWIT 128LQFP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD8108ASTZ 制造商:Analog Devices 功能描述:IC SWITCH VIDEO
AD8108ASTZ2 制造商:AD 制造商全稱:Analog Devices 功能描述:325 MHz, 8 ?? 8 Buffered Video Crosspoint Switches
AD8108EB 制造商:Analog Devices 功能描述:
AD8108-EB 制造商:Analog Devices 功能描述:Evaluation Board For IC Video Crosspt 325MHz 8X8 制造商:Analog Devices 功能描述:VID CROSSPT 325MHZ 8X8 - Bulk
AD8109 制造商:AD 制造商全稱:Analog Devices 功能描述:325 MHz, 8 x 8 Buffered Video Crosspoint Switches
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