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參數(shù)資料
| 型號(hào)： | FS6131-01 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Programmable Line Lock Clock Generator IC |
| 中文描述： | 可編程線鎖定時(shí)鐘發(fā)生器IC |
| 文件頁數(shù)： | 7/39頁 |
| 文件大?。?/td> | 435K |
| 代理商： | FS6131-01 |
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7
FS6131-01
Programmable Line Lock Clock Generator IC
4.4.1
The VCXO may be coarse tuned by a programmable ad-
justment of the crystal load capacitance via the XCT[3:0]
control bits. See Table 11 for the control code and the
associated loading capacitance.
The actual amount of frequency warping caused by the
tuning capacitance will depend on the crystal used. The
VCXO tuning capacitance includes an external 6pF load
capacitance (12pF from the XIN pin to ground and 12pF
from the XOUT pin to ground). The fine tuning capability
of the VCXO can be enabled by setting the XLVTEN bit
to a one, or disabled by setting it to a zero.
Figure 11 shows the typical effect of the coarse and fine
tuning mechanisms. The total coarse tune range is about
350ppm. The difference in VCXO frequency in parts per
million (ppm) is shown as the fine tuning voltage on the
XTUNE pin varies from 0V to 5V. Note that as the crystal
load capacitance is increased the VCXO frequency is
pulled somewhat less with each coarse step, and the fine
tuning range decreases. The fine tuning range always
overlaps a few coarse tuning ranges, eliminating the pos-
sibility of holes in the VCXO response. The different
crystal warping characteristics may change the scaling on
the Y-axis, but not the overall characteristic of the curves.
VCXO Tuning
Figure 11: VCXO Coarse and Fine Tuning
VCXO Range (ppm) vs. XTUNE Voltage (V)
-200
-150
-100
-50
0
50
100
150
200
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
Coarse Tune Setting XCT[3:0]
V
XTUNE Voltage = 0.0V
XTUNE Voltage = 5.0V
4.5
The Crystal Loop is designed to attenuate the jitter on a
highly jittered, low-Q, low frequency reference. The
Crystal Loop can also maintain a constant frequency out-
put into the Main Loop if the low frequency reference is
intermittent.
The Crystal Loop consists of a Voltage-Controllable
Crystal Oscillator (VCXO), a divider, a PFD, and a charge
pump that tunes the VCXO to a frequency reference. The
frequency reference is phase-locked to the divided fre-
quency of an external, high-Q, jitter-free crystal, thereby
locking the VCXO to the reference frequency. The VCXO
can continue to run off the crystal even if the frequency
reference becomes intermittent.
Crystal Loop
4.5.1
When the Crystal Loop is synchronized to an external
frequency source, the FS6131 can monitor the Crystal
Loop and detect if the loop unlocks from the external
source. The Crystal Loop tries to drive to zero frequency
if the external source is dropped, and sets a Lock Status
error flag.
The Crystal Loop can also detect if the VCXO has
dropped out of the Fine Tune range, requiring a change
to the Coarse Tune. The Lock Status also latches the
direction the loop went out of range (high or low) when
the loop became unlocked.
Locking to an External Frequency Source
4.5.1.1
To enable this mode, clear the STAT[1] and STAT[0] bits
to zero. If the CMOS bit is set to one, the LOCK/IPRG pin
will be low if the Crystal Loop becomes unlocked. The
flag is always available under software control by reading
back the STAT[1] bit, which is overwritten with a the
status flag (low = unlocked) in this mode (see Table 6).
Crystal Loop Lock Status Flag
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FS6131-01G | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Programmable Line Lock Clock Generator IC |
| FS6131-01G-XTD | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 I2C PROG PLL CLK RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| FS6131-01G-XTP | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 I2C PROG PLL CLK RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| FS6131-01I-XTD | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 I2C PROG PLL CLK (IND) RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| FS6131-01I-XTP | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 I2C PROG PLL CLK IND RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
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