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HV57009_07 参数 Datasheet PDF下载

HV57009_07图片预览
型号: HV57009_07
PDF下载: 下载PDF文件 查看货源
内容描述: 64通道串行到并行转换器采用P沟道开漏输出可控制输出电流 [64-Channel Serial to Parallel Converter with P-Channel Open Drain Controllable Output Current]
分类和应用: 转换器
文件页数/大小: 8 页 / 802 K
品牌: SUPERTEX [ Supertex, Inc ]
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HV57009  
Typical Current Programing Circuits  
VDD  
VDD  
0.1µF  
0.1µF  
HV57009  
HV57009  
VBP  
VBP  
To other  
outputs  
To other  
outputs  
Logic  
Logic  
IOUT  
-
+
IOUT  
-
+
HVOUT  
HVOUT  
+IN  
-IN  
+IN  
-IN  
VSS  
VSS  
RD*10KΩ  
CD*390pF  
REXT  
IREF  
RD*10KΩ  
C *  
REXT  
IREF  
VREF  
390pF  
D
VREF  
Figure 1b: Positive Control  
*Required if REXT > 10KΩ or REXT is replaced by a constant current source.  
Figure 1a: Negative Control  
VREF  
REXT  
Since IOUT = IREF  
Therefore:  
=
Given IOUT and VREF, the REXT can be calculated by using:  
VREF  
IREF  
VREF  
IOUT  
If IOUT = 2.0mA and VREF = -5.0V → REXT = 2.5KΩ.  
If IOUT = 1.0mA and REXT = 1.0KΩ → VREF = -1.0V.  
REXT  
=
=
If REXT >10KΩ, add series network RD and CD to ground for  
stability as shown.  
The intersection of a set of I  
and VREF values can be lo-  
cated in the graph shown beOloUTw. The value picked for REXT  
must always be in the shaded area for linear operation. This  
This control method behaves linearly as long as the opera- control method has the advantage that V is positive, and  
tional amplifier is not saturated. However, it requires a nega- draws only leakage current. If REXT > 10KREF, add series net-  
tive power source and needs to provide a current IREF = IOUT work RD and CD to ground for stability as shown.  
for each HV570 chip being controlled.  
Note:  
If HVOUT ≥ +1.0V, the HVOUT cascode may no longer oper-  
ate as a perfect current source, and the output current will  
diminish. This effect depends on the magnitude of the output  
current.  
Lower reference current IREF, results in higher distortion,  
∆ICS, on the output.  
HV570 IOUT vs. VREF  
4
3
2
1
0
0.1K  
0.2K  
0.5K  
1K  
2K  
3K  
5K  
0
1
2
3
4
5
VREF (Volts)  
6