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參數(shù)資料
| 型號(hào)： | DS4000KI/WBGA |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC TCXO 19.44MHZ 24-BGA |
| 標(biāo)準(zhǔn)包裝： | 135 |
| 類型： | 溫度 - 補(bǔ)償晶體振蕩器（TCXO） |
| 頻率： | 19.44MHz |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 電流 - 電源： | 1.5mA |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 24-BBGA |
| 包裝： | 托盤 |
| 供應(yīng)商設(shè)備封裝： | 24-WBGA（11x9） |
| 安裝類型： | 表面貼裝 |
DS4000 Digitally Controlled TCXO
8 of 16
DIGITAL TUNING THE BASE CRYSTAL FREQUENCY
When using the 2-wire interface for tuning the base frequency, the frequency tuning register is used. The frequency
tuning register contains two’s complement data. The data is used to add or subtract an offset from the crystal
loading register. When the tuning register is programmed with a value, the next temperature-update cycle sums the
programmed value with the factory-compensated value. This allows the user/system to digitally control the base
frequency by a microcontroller using the 2-wire protocol.
FREQUENCY TUNING REGISTER (66h)
Bit
7
6
5
4
3
2
1
0
Name
SIGN
FO6
FO5
FO4
FO3
FO2
FO1
FO0
Default
0
FOS[6:0], Frequency Offset: These bits are used to tune the base crystal frequency. Each bit represents
approximately 0.08ppm and, therefore, for a value of 07FH, pushes or pulls the base frequency by approximately
10.16ppm.
SIGN, Sign Bit: This bit is used to determine whether to add or subtract the frequency offset from the crystal
loading.
Table 1. Frequency Tuning Relationship
CALCULATED
FREQUENCY OFFSET
(ppm)
DIGITAL DATA
(Binary)
DIGITAL DATA
(hex)
-10.16
0111 1111
7Fh
-8.00
0110 0100
64h
-5.28
0100 0010
42h
-1.84
0001 0111
17h
-0.08
0000 0001
01h
0.0
0000 0000
00h
+0.08
1111 1111
FFh
+1.84
1110 1000
E8h
+5.28
1011 0011
B3h
+8.00
1001 1100
9Ch
+10.16
1000 0000
80h
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相關(guān)代理商/技術(shù)參數(shù) |
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| DS4000N | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Digitally Controlled TCXO |
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| DS400MH | 制造商:Eaton Corporation 功能描述:Safety Switch Access/Meyers Type Hub-4 Inch |
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| DS4010B-DV | 制造商:Wiremold / Legrand 功能描述:DS4000 Blank End Fitting, Fog White |
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