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參數(shù)資料
| 型號(hào)： | CD-700LAFNAB-20.000 |
| 廠商： | VECTRON INTERNATIONAL |
| 元件分類： | XO, clock |
| 英文描述： | PHASE LOCKED LOOP, CQCC16 |
| 封裝： | HERMETIC SEALED, CERAMIC, SMD-16 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大小： | 146K |
| 代理商： | CD-700LAFNAB-20.000 |
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CD-700, VCXO Based PLL
Vectron International
166 Glover Avenue, Norwalk, CT 06856 Tel: 1-88-VECTRON-1 http://www.vectron.com
VDD
0V
0
+π
π
Relative
Phase (
θ
e)
VDD/2
Vd
Gain Slope = VDD/ 2
π
Figure 5. Open Loop Phase Detector Transfer Curve
Recovered Clock and Data Alignment Outputs
The CD-700 is designed to recover an embedded clock from an NRZ data signal and retime it with a data
pattern. In this application, the VCXO frequency is exactly the same frequency as the NRZ data rate and
the outputs are taken off Pin 9 (RCLK), and Pin 10 (RDATA). Under locked conditions, the falling edge of
RCLK is centered in the RDATA pattern. Also, there is a 1.5 clock cycle delay between DATAIN and
RDATA. Figure 6 shows the relationship between the DATAIN, CLKIN, RDATA and RCLK.
Figure 6. Clock and Data Timing Relationships for the NRZ data
Other RZ encoding schemes such as Manchester or AMI can be accomodated by using a CD-700 at twice
the baud rate.
Loss of Signal, LOS and LOSIN
The LOS circuit provides an output alarm flag when the DATAIN input signal is lost. The LOS output is
normally a logic low and is set to a logic high after 256 consecutive clock periods on CLKIN with no
detected DATAIN transitions. This signal can be used to either flag external alarm circuits and/or drive the
CD-700’s LOSIN input. When LOSIN is set to a logic high, the VCXO control voltage (pin 16) is switched
to an internal voltage which sets OUT1 and OUT2 to center frequency +/-75ppm. Also, LOS automatically
closes the op amp feedback which means the op-amp is a unity gain buffer and will produce a DC voltage
equal to the +op amp voltage (pin 15), usually V
DD/2.
Data1
Clock In
CLKIN
Data In
DATAIN
Recovered Data
RDATA
Recovered Clock
RCLK
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