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参数资料
| 型号： | 74VHC4046N |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | XO, clock |
| 英文描述： | CMOS Phase Lock Loop |
| 中文描述： | PHASE LOCKED LOOP, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 8/14页 |
| 文件大小： | 283K |
| 代理商： | 74VHC4046N |
Comparator I
Comparator II & III
R
2
e
%
R
2
i
%
R
2
e
%
R
2
i
%
–Given: f
0
–Use f
0
with curve titled
center frequency vs R1, C
to determine R1 and C1
–Given: f
0
and f
L
–Calculate f
min
from the
equation f
min
e
f
o
b
f
L
–Use f
min
with curve titled
offset frequency vs R2, C
to determine R2 and C1
–Calculate f
max
/f
min
from
the equation f
max
/f
min
e
f
o
a
f
L
/f
o
b
f
L
–Use f
max
/f
min
with curve
titled f
max
/f
min
vs R2/R1
to determine ratio R2/R1
to obtain R1
–Given: f
max
–Calculate f
0
from the
equation f
o
e
f
max
/2
–Use f
0
with curve titled
center frequency vs R1, C
to determine R1 and C1
–Given: f
min
and f
max
–Use f
min
with curve titled
offset frequency vs R2,
C to determine R2 and C1
–Calculate f
max
/f
min
–Use f
max
/f
min
with curve
titled f
max
/f
min
vs R2/R1
to determine ratio R2/R1
to obtain R1
(b)
FIGURE 1
(Continued)
Detailed Circuit Description
VOLTAGE CONTROLLED OSCILLATOR/SOURCE
FOLLOWER
The VCO requires two or three external components to op-
erate. These are R1, R2, C1. Resistor R1 and capacitor C1
are selected to determine the center frequency of the VCO.
R1 controls the lock range. As R1’s resistance decreases
the range of f
min
to f
max
increases. Thus the VCO’s gain
decreases. As C1 is changed the offset (if used) of R2, and
the center frequency is changed. (See typical performance
curves) R2 can be used to set the offset frequency with 0V
at VCO input. If R2 is omitted the VCO range is from 0Hz. As
R2 is decreased the offset frequency is increased. The ef-
fect of R2 is shown in the design information table and typi-
cal performance curves. By increasing the value of R2 the
lock range of the PLL is offset above 0Hz and the gain
(Volts/rad.) does not change. In general, when offset is de-
sired, R2 and C1 should be chosen first, and then R1 should
be chosen to obtain the proper center frequency.
Internally the resistors set a current in a current mirror as
shown in Figure 1. The mirrored current drives one side of
TL/F/11675–18
FIGURE 2. Logic Diagram for VCO
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 74VHC4046NX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:CMOS Phase Lock Loop |
| 74VHC4051 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:8-Channel Analog Multiplexer . Dual 4-Channel Analog Multiplexer . Triple 2-Channel Analog Multiplexer |
| 74VHC4051AFT | 功能描述:1 Circuit IC Switch 8:1 37 Ohm 16-TSSOPB 制造商:toshiba semiconductor and storage 系列:- 包装:剪切带（CT） 零件状态:有效 开关电路:- 多路复用器/解复用器电路:8:1 电路数:1 导通电阻（最大值）:37 欧姆 通道至通道匹配（ΔRon）:5 欧姆 电压 -?电源，单（V+）:2 V ~ 5.5 V 电压 - 电源，双（V±）:- 开关时间（Ton, Tof）（最大值）:12ns，12ns -3db 带宽:180MHz 电荷注入:- 沟道电容 （CS(off），CD（off））:0.5pF，23.4pF 电流 - 漏泄（IS（off））（最大值）:100nA 串扰:-45dB @ 1MHz 工作温度:-40°C ~ 85°C（TA） 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:16-TSSOPB 标准包装:1 |
| 74VHC4051M | 功能描述:多路器开关 IC 8-Chan Ana Multiplex RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| 74VHC4051M_Q | 功能描述:多路器开关 IC 8-Chan Ana Multiplex RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
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