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AZP63_13 参数 Datasheet PDF下载

AZP63_13图片预览
型号: AZP63_13
PDF下载: 下载PDF文件 查看货源
内容描述: 低相位噪声正弦波/ CMOS到LVPECL缓冲器/转换器 [Low Phase Noise Sine Wave / CMOS to LVPECL Buffer / Translator]
分类和应用: 转换器
文件页数/大小: 12 页 / 519 K
品牌: AZM [ ARIZONA MICROTEK, INC ]
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Arizona Microtek, Inc.  
AZP63  
Low Phase Noise Sine Wave CMOS  
to LVPECL Buffer/Translator  
OUTPUT TERMINATION TECHNIQUES  
The LVPECL compatible output stage of the AZP63 uses a current drive topology to maximize switching speed as  
illustrated below in Figure 4. Two current source PMOS transistors (M1-M2) feed the output pins. M5 is an NMOS  
current source which is switched by M3 and M4. When M4 is on, M5 takes current from M2. This produces an output  
current of 5.1mA (low output state). M3 is off, and the entire 21.1mA flows through the output pin. The associated output  
voltage swings match LVPECL levels when external 50resistors terminate the outputs.  
Both Q and Q¯ should always be terminated identically to avoid waveform distortion and circulating current caused by  
unsymmetrical loads. This rule should be followed even if only one output is in use.  
VDD (+3.3 V)  
Output  
Stage  
M1  
M2  
External  
Circuitry  
Vbp  
21.1mA  
21.1mA  
Q
Q
21.1mA - High  
5.1mA - Low  
50  
50Ω  
M3  
M4  
D
M5  
VTT = VDD - 2.0V  
Vbn  
16mA  
Figure 4 - Typical Output Termination  
DUAL SUPPLY LVPECL OUTPUT TERMINATION  
The standard LVPECL loads are a pair of 50resistors connected between the outputs and VDD-2.0V (Figure 4). The  
resistors provide both the DC and the AC loads, assuming 50interconnect. If an additional supply is available within the  
application, a four resistor termination configuration is possible (Figure 5).  
www.azmicrotek.com  
+1-480-962-5881  
5
Request a Sample  
Mar 2013, Rev 2.2