hbwhelp@micrel.com or (408) 955-1690 19 Figure 6 show" />
參數(shù)資料
型號(hào): SY89538LHZ
廠商: Micrel Inc
文件頁數(shù): 11/23頁
文件大小: 0K
描述: IC SYNTHESIZR LVPECL/LVDS 64TQFP
標(biāo)準(zhǔn)包裝: 160
系列: Precision Edge®
類型: 時(shí)鐘合成器/扇出緩沖器
PLL:
輸入: CMOS,HSTL,LVDS,LVPECL,LVTTL,SSTL,晶體
輸出: LVDS,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 3:7
差分 - 輸入:輸出: 是/是
頻率 - 最大: 756MHz
除法器/乘法器: 是/無
電源電壓: 2.375 V ~ 3.6 V
工作溫度: 0°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝: 64-EP-TQFP
包裝: 托盤
Micrel, Inc.
SY89538L
January 2008
M9999-010808-E
hbwhelp@micrel.com or (408) 955-1690
19
Figure 6 shows the open and closed loop gain of the
SY89538L. The closed loop-gain plot shows that the
SY89538L when configured with the recommended
loop filter values has essentially no jitter peaking near
the -3dB point. In addition, the open loop curve shows
the frequency at which unity gain occurs for a typical
case of the SY89538L with VCC = 3.3V at TA = 25°C.
At unity gain, Figure 7 can be used to determine the
phase margin or stability of the SY89538L.
Figure 6. Open and Closed Loop Gain
at VCC = 3.3V, TA = 25°C
Figure 7. Phase Margin Plot
at VCC = 3.3V, TA = 25°C
Figure 8 illustrates the VCO frequency versus the loop
filter control voltage at 3.3V, TA = 25°C. The normal
loop filter control voltage is -300mV to +300mV.
Figure 9 illustrates the VCO gain curve at VCC = 3.3V,
TA = 25°C. With this set of information, determining
the loop stability with other sets of loop filter
configurations is possible.
Figure 8. Loop Filter Control Voltage vs.
Frequency at 3.3V, TA = 25°C
Figure 9. Frequency vs.
Loop Filter Control Voltage at 3.3V, TA = 25°C
Input Interface
RFCK and FBIN are designed to accept any
differential or single-ended input signal 300mV above
VCC or 300mV below GND. RFCK and FBIN should
not be left floating. Tie either the true or complement
input to GND, but not both. A logic zero is achieved by
connecting the complement input to GND with the true
input floating. For TTL input, tie a 2.5k resistor
between the complement input and GND. LVDS, CML
and HSTL differential signals may be connected
directly to the reference inputs.
Figure 10. Simplified Input Structure
dB
Phase
M
argin
(
°)
Frequency (Hz)
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