參數(shù)資料
型號(hào)： ISL59533IKEZ
廠商： INTERSIL CORP
元件分類： 運(yùn)動(dòng)控制電子
英文描述： 32x32 Video Crosspoint with Differential Inputs
中文描述： 32-CHANNEL, CROSS POINT SWITCH, PBGA356
封裝： 27 X 27 MM, 1.17 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, PLASTIC, MS-034A-BAL-2, BGA-356
文件頁(yè)數(shù)： 21/24頁(yè)
文件大?。?/td> 1229K
代理商： ISL59533IKEZ
21
FN6222.0
March 13, 2006
Gain Setting
The gain of each output may be set to 1 or 2 using the gain set word. It is in the same format as the output enable control word:
Input to Output Selection
Individual outputs receive their input selection choice using the input/output control word. Its format is:
For a given binarily selected output, as specified by the O's, an input channel is assigned by the binarily selected I's. Thirty-two
transmissions of the input/output control words will be required to set up all outputs.
Broadcast Mode
The broadcast mode routs one input to all 32 outputs. It has a memory bit that remembers its state. The configuration of
input/output assignments that existed before setting broadcast mode is kept in memory and when broadcast mode is disabled the
previous configuration is restored. The broadcast control word format is:
EB sets or resets the broadcast mode memory bit. The I's binarily select the input channel to be broadcast to all outputs.
Note:
Going from broadcast mode to normal crosspoint mode can alter the input/output configuration. All input/output
selections currently must be re-sent after a broadcast-to-non-broadcast transition.
Bandwidth Considerations
Wide frequency response (high bandwidth) in a video
system means better video resolution. Four sets of
frequency response curves are shown in Figure 47.
Depending on the switch configurations, one can get
between 250MHz to 350MHz bandwidth. A short discussion
of the trade-offs follows—including matrix configuration,
output buffer gain selection, channel selection, and loading.
FIGURE 47. FREQUENCY RESPONSE FOR VARIOUS MODES
In multiplexer mode, the input only drives one output
channel, while in broadcast mode the same input drives all
32 outputs. The parasitic capacitance of all 32 channels
loads down the input and reduces bandwidth in broadcast
mode. In addition, output buffer gain of +2 has higher
bandwidth than gain of +1 due to internal device
compensation. Therefore, the highest bandwidth set-up is
multiplexer mode and output buffer gain of +2.
The relative location of the input and output channel also has
significant impact on the device bandwidth. Again this is due
to the layout of the device. When the input and output
channels are further away, there are additional parasitics as
a result of the distance and lower bandwidth results.
The bandwidth does not change significantly with resistive
loading as shown in Figure 3 in the typical performance
curves. However, it does change greatly with capacitance
loading, Figure 4 in typical performance curves. This is most
significant when laying out the PCB. If the PCB trace
between the output of the crosspoint switch and the back
termination resistor is not minimized, additional parasitic
capacitance severely distorts the frequency response.
To emphasize how critical the PCB layout is to performance,
let’s compare the two boards presented in Figures 48 and
49. Figure 48 shows a larger engineering evaluation board
where the termination resistor is far away from the device
because of the use of a socket. The board in Figure 48 is a
TABLE 5. GAIN SET FORMAT
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
1
0
-
-
-
N1
N0
G
n+7
G
n+6
G
n+5
G
n+4
G
n+3
G
n+2
G
n+1
G
n
TABLE 6. INPUT/OUTPUT WORD
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
0
0
I
4
I
3
I
2
I
1
I
0
-
-
-
O
4
O
3
O
2
O
1
O
0
TABLE 7. BROADCAST WORD
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
1
1
I
4
I
3
I
2
I
1
I
0
-
-
-
-
-
-
-
EB
1
10
100
1000
2
0
-2
-4
-6
-8
-10
N
Frequency [MHz]
Mux, Av = 2
Mux, Av = 1
Broadcast,
Av = 1
Broadcast,
Av = 2
ISL59533
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