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參數(shù)資料
| 型號： | ORCAORT8850 |
| 英文描述： | Single 2.3V PNP in OP, I temp, -40C to +85C, 8-MSOP, T/R |
| 中文描述： | 現(xiàn)場可編程系統(tǒng)芯片（促進文化基金）8通道x 850 Mbits /秒背板收發(fā)器 |
| 文件頁數(shù)： | 42/90頁 |
| 文件大?。?/td> | 1915K |
| 代理商： | ORCAORT8850 |
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ORCAORT4622 FPSC
Four-Channel x 622 Mbits/s Backplane Transceiver
Preliminary Data Sheet
March 2000
42
L Lucent Technologies Inc.
HSI Circuit Specifications
(continued)
Power Supply Decoupling LC Circuit
The 622 MHz HSI macro contains both analog and digital circuitry. The data recovery function, for example, is
implemented as primarily a digital function, but it relies on a conventional analog phase-locked loop to provide its
622 MHz reference frequency. The internal analog phase-locked loop contains a voltage-controlled oscillator. This
circuit will be sensitive to digital noise generated from the rapid switching transients associated with internal logic
gates and parasitic inductive elements. Generated noise that contains frequency components beyond the band-
width of the internal phase-locked loop (about 3 MHz) will not be attenuated by the phase-locked loop and will
impact bit error rate directly. Thus, separate power supply pins are provided for these critical analog circuit ele-
ments.
Additional power supply filtering in the form of a LC pi filter section will be used between the power supply source
and these device pins as shown in Figure 13. The corner frequency of the LC filter is chosen based on the power
supply switching frequency, which is between 100 kHz and 300 kHz in most applications.
Capacitors C1 and C2 are large electrolytic capacitors to provide the basic cutoff frequency of the LC filter. For
example, the cutoff frequency of the combination of these elements might fall between 5 kHz and 50 kHz. Capaci-
tor C3 is a smaller ceramic capacitor designed to provide a low-impedance path for a wide range of high-frequency
signals at the analog power supply pins of the device. The physical location of capacitor C3 must be as close to the
device lead as possible. Multiple instances of capacitors C3 can be used if necessary. The recommended filter for
the HSI macro is shown below: L = 4.7
μ
H, RL = 1
, C1 = 0.01
μ
F, C2 = 0.01
μ
F, C3 = 4.7
μ
F.
5-9344(F)
Figure 13. Sample Power Supply Filter Network for Analog HSI Power Supply Pins
C2
+
C3
+
TO DEVICE
PLL_VDDA
PLL_VSSA
C1
+
FROM POWER
SUPPLY SOURCE
L
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