参数资料
| 型号： | HA5024IBZ |
| 厂商： | Intersil |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP QUAD 125MHZ 20-SOIC |
| 标准包装： | 38 |
| 应用： | 电流反馈 |
| 电路数： | 4 |
| -3db带宽： | 125MHz |
| 转换速率： | 350 V/µs |
| 电流 - 电源： | 7.5mA |
| 电流 - 输出 / 通道： | 20mA |
| 电压 - 电源，单路/双路(±)： | ±4.5 V ~ 18 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 管件 |
| 产品目录页面： | 1234 (CN2011-ZH PDF) |
8
3550.6
February 8, 2006
The circuit shown in Figure 8 is a simplified schematic of the
enable/disable function. The large value resistors in series with
the DISABLE pin makes it appear as a current source to the
driver. When the driver pulls this pin low current flows out of the
pin and into the driver. This current, which may be as large as
350
A when external circuit and process variables are at their
extremes, is required to insure that point “A” achieves the
proper potential to disable the output.The driver must have the
compliance and capability of sinking all of this current.
When VCC is +5V the DISABLE pin may be driven with a
dedicated TTL gate. The maximum low level output voltage
of the TTL gate, 0.4V, has enough compliance to insure that
the amplifier will always be disabled even though D1 will not
turn on, and the TTL gate will sink enough current to keep
point “A” at its proper voltage. When VCC is greater than +5V
the DISABLE pin should be driven with an open collector
device that has a breakdown rating greater than VCC.
Referring to Figure 8, it can be seen that R6 will act as a pull-up
resistor to +VCC if the DISABLE pin is left open. In those cases
where the enable/disable function is not required on all circuits
some circuits can be permanently enabled by letting the
DISABLE pin float. If a driver is used to set the enable/disable
level, be sure that the driver does not sink more than 20
A
when the DISABLE pin is at a high level. TTL gates, especially
CMOS versions, do not violate this criteria so it is permissible to
control the enable/disable function with TTL.
Typical Applications
Four Channel Video Multiplexer
Referring to the amplifier U1A in Figure 9, R1 terminates the
cable in its characteristic impedance of 75
, and R4 back
terminates the cable in its characteristic impedance. The
amplifier is set up in a gain configuration of +2 to yield an
overall network gain of +1 when driving a double terminated
cable. The value of R3 can be changed if a different network
gain is desired. R5 holds the disable pin at ground thus
inhibiting the amplifier until the switch, S1, is thrown to
position 1. At position 1 the switch pulls the disable pin up to
the plus supply rail thereby enabling the amplifier. Since all
of the actual signal switching takes place within the amplifier,
its differential gain and phase parameters, which are 0.03%
and 0.03 degrees respectively, determine the circuit’s
performance. The other three circuits, U1B through U1D,
operate in a similar manner.
When the plus supply rail is 5V the disable pin can be driven by
a dedicated TTL gate as discussed earlier. If a multiplexer IC or
its equivalent is used to select channels its logic must be break
before make. When these conditions are satisfied the
HA5024IP is often used as a remote video multiplexer, and the
multiplexer may be extended by adding more amplifier ICs.
Low Impedance Multiplexer
Two common problems surface when you try to multiplex
multiple high speed signals into a low impedance source such
as an A/D converter. The first problem is the low source
impedance which tends to make amplifiers oscillate and
causes gain errors. The second problem is the multiplexer
which supplies no gain, introduces all kinds of distortion and
limits the frequency response. Using op amps which have an
enable/disable function, such as the HA5024, eliminates the
multiplexer problems because the external mux chip is not
needed, and the HA5024 can drive low impedance (large
capacitance) loads if a series isolation resistor is used.
R6
15K
R7
15K
+VCC
ENABLE/DISABLE INPUT
D1
QP3
R8
QP18
A
R33
R10
FIGURE 8. SIMPLIFIED SCHEMATIC OF ENABLE/DISABLE
FUNCTION
NOTES:
18. U1 is HA5024IP.
19. All resistors in
.
20. S1 is break before make.
21. Use ground plane.
FIGURE 9. FOUR CHANNEL VIDEO MULTIPLEXER
+
-
U1A
+
-
U1B
+
-
+
-
VIDEO
INPUT
#1
VIDEO OUTPUT
75
LOAD
R4
75
3
2
4
R1
75
R3
681
R5
2000
R2
681
TO
1
R6
75
R8
681
R7
681
R9
75
10
8
9
7
R10
2000
1 R21
100
2
3
4
VIDEO
INPUT
#3
R11
75
13
12
14
15
-5V
11
R13
681
R12
681
R15
2000
R14
75
+5V
S1
ALL
OFF
VIDEO
INPUT
#4
R16
75
18
19
17
6
20
R19
75
R20
2000
R17
681
R18
681
U1C
U1D
+5V
+5V IN
+5V
0.1
F
10
F0.1F10F
-5V IN
-5V
100
(NOTE 17)
100
(NOTE 17)
100
(NOTE 17)
100
(NOTE 17)
HA5024
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HA5024IBZ96 | 功能描述:视频放大器 W/ANL OPAMP4X 125MHZ CFB DISABLE 20W IND RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| HA5024IP | 功能描述:IC AMP VIDEO 125MHZ QUAD 20-PDIP RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| HA5024IPZ | 功能描述:视频放大器 W/ANNEAL OPAMP 4X 12 5MHZ CFB DISABLE RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| HA5025 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Quad, 125MHz Video Current Feedback Amplifier |
| HA5025 WAF | 制造商:Harris Corporation 功能描述: 制造商:Intersil Corporation 功能描述: |
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