參數(shù)資料
型號： MC13xx
廠商： Motorola, Inc.
英文描述： CONVERTER, DC/DC, 1O/P, 5W, 3.3V; Power rating:5W; DC/DC Converter O/P type:Single; Voltage, input max:36V; Voltage, input min:9V; Voltage, output:3.3V; Depth, external:10.2mm; Length / Height, external:31.8mm; Width, RoHS Compliant: Yes
中文描述： 通用窄帶調(diào)頻接收器集成電路
文件頁數(shù)： 26/68頁
文件大?。?/td> 1316K
代理商： MC13XX
MC13110A/B MC13111A/B
26
MOTOROLA ANALOG IC DEVICE DATA
Second Local Oscillator
The 2nd LO is a CMOS oscillator. It is used as the PLL
reference oscillator and local oscillator for the second
frequency conversion in the RF receiver. It is designed to
utilize an external parallel resonant crystal. See schematic in
Figure 39.
Figure 39. Second Local Oscillator Schematic
2nd LO
RPI
CPI
RPO
CPO
Gm
LO2 In
LO2 Out
Xtal
C2
C1
ááááááááááááááááá
á
ááááááááááááááááá
áááááááááááááááá
ááááááááááááááá
á
áááááááááááááááá
Figure 41 shows a typical gain/phase response of the
second local oscillator. Load capacitance (CL), equivalent
series resistance (ESR), and even supply voltage will have
and affect on the 2nd LO response as shown in Figures 45
and 46. Except for the standby mode open loop gain is fairly
constant as supply voltage increases from 2.5 V. This is due
to the regulated voltage of 2.5 V on PLL Vref. From the graphs
it can seen that optimum performance is achieved when C1
equals C2 (C1/C2 = 1).
Figure 46 represents the ESR versus crystal load
capacitance for the 2nd LO. This relationship was defined by
using a 6.0 dB minimum loop gain margin at 3.6 V. This is
considered the minimum gain margin to guarantee oscillator
start–up.
Oscillator start–up is also significantly affected by the
crystal load capacitance selection. In Figures 42 and 43 the
relationship between crystal load capacitance, supply
voltage, and external load capacitance ratio (C2/C1), can be
seen. The lower the load capacitance the better the
performance.
Given the desired crystal load capacitance, C1 and C2
can be determined from Figure 47. It is also interesting to
point out that current consumption increases when C1
≠
C2,
as shown in Figure 44.
Be careful not to overdrive the crystal. This could cause a
noise problem. An external series resistor on the crystal
output can be added to reduce the drive level, if necessary.
Vg
0
6.0
10.235
15
S
CAPACITOR RATIO (C2:C1)
Figure 41. Second LO Gain/Phase @ –10 dBm
f, FREQUENCY (MHz)
Figure 42. Start–Up Time versus Capacitor
Ratio, Inactive to Rx Mode
10.24 MHz Crystal
CL = 10 pF
RS = 20
Gain
VCC = 5.0 V
VCC = 3.6 V
VCC = 2.3 V
VCC = 2.7 V
10
5.0
0
–5.0
–10
–15
–20
–25
5.0
4.0
3.0
2.0
1.0
0
10.24
10.245
Phase
90
67.5
45
22.5
0
–22.5
–45
–67.5
–90
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
10.24 MHz Crystal
CL = 10 pF
RS = 20
C1 = C2 = 15 pF
SECOND LOCAL OSCILLATOR
相關(guān)PDF資料
PDF描述
MC13122DW AMAX STEREO IC CHIPSET
MC13122 AMAX STEREO IC CHIPSET
MC13027DW AMAX STEREO IC CHIPSET
MC13027P AMAX STEREO IC CHIPSET
MC13122P CONNECTOR KIT, JPS130PT; RoHS Compliant: Yes
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC-14 功能描述:TERM BARRIER 14CIRC DUAL ROW RoHS:是 類別:連接器，互連式 >> 接線座 - 隔板塊 系列:M 標(biāo)準(zhǔn)包裝:10 系列:Beau™ 38780 端接塊類型:阻隔塊 電路數(shù):15 導(dǎo)線入口數(shù)目:30 間距:0.438"（11.12mm） 行數(shù):2 電流:15A 電壓:300V 線規(guī):14-22 AWG 頂部端子:螺釘 底部端子:焊片 阻擋層類型:雙壁（雙） 特點(diǎn):法蘭 顏色:黑 包裝:散裝 安裝類型:通孔 工作溫度:- 材料 - 絕緣體:聚對苯二甲酸丁二酯（PBT），玻璃纖維增強(qiáng)型 材料可燃性額定值:UL94 V-0 其它名稱:038780-111538780-1115387801115
MC14000 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Dual 3-Input NOR Gate Plus Inverter
MC14000UB 制造商:Motorola Inc 功能描述: 制造商:Motorola Inc 功能描述:14000UB
MC14000UBCL 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Dual 3-Input NOR Gate Plus Inverter
MC14000UBCP 制造商:Motorola Inc 功能描述: 制造商:Motorola Inc 功能描述:4000/14000/40000 SERIES, DUAL 3-INPUT NOR GATE, PDIP14
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*