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PDF VSC8122 Data sheet ( Hoja de datos )
| Número de pieza | VSC8122 | |
| Descripción | Multi-Rate SONET/SDH Clock and Data Recovery IC | |
| Fabricantes | Vitesse Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de VSC8122 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC8122
Multi-Rate SONET/SDH
Clock and Data Recovery IC
Features
• Multi-Rate OC-3, OC-12, OC-24, OC-48 Clock
and Data Recovery
• Supports Gigabit Ethernet
• Differential Back Terminated I/O
• Maintains Clock Output in the Absence of Data
• Selectable Reference Clock
• Loss of Lock Indicator
• Exceeds SONET/SDH Requirements for Jitter
Tolerance, Jitter Transfer and Jitter Generation.
• 3.3V Supply Operation
• 1W Typical Power
• 64-pin , 10x10mm PQFP Packaging
General Description
The VSC8122 is a single-chip clock recovery IC for use in SONET OC-48, OC-24, OC-12, OC-3, or Giga-
bit Ethernet systems operating at their respective 2.48832Gb/s, 1.24416Gb/s, 622.08Mbps, 155.52Mbps, or
1.25Gbps data rates. The VSC8122 complies with SONET jitter tolerance, jitter transfer and jitter generation
specifications.
Alarm functions support typical telecom system applications. The Loss of Lock (LOL) output indicates
when the device goes out of lock, which would most often occur in the event of a loss of valid data. The NOREF
output flags when the reference input to the VSC8122 either is removed, or goes severely out of tolerance.
VSC8122 Block Diagram
FILTO+/- FILTI+/-
FSEL[1:0]
DI+
DI-
Ph/Freq.
Detector
Loop
Filter
VCO
Divider
CO+
CO-
REFCK1 +/-
REFCK0 +/-
Divider
Data
Retiming
Lock
Detect
DO+
DO-
LOL
NOREF
REF_INPUTSEL
REF_SEL[1:0]
G52228-0, Rev 4.1
01/05/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected]
Internet: www.vitesse.com
Page 1
1 page  
Data Sheet
VSC8122
VITESSE
SEMICONDUCTOR CORPORATION
Multi-Rate SONET/SDH
Clock and Data Recovery IC
Table 2: Reference Frequency
Reference Frequency
19.44MHz (19.53MHz)
38.88MHz (39.06MHz)
77.76MHz (78.13MHz)
155.52MHz (156.25MHz)
REF_SEL0
0
1
0
1
REF_SEL1
0
0
1
1
Loop Filter
The Phase-Lock Loop (PLL) on the VSC8122 employs two external capacitors. The PLL design is fully
differential, therefore the loop filter must also be fully differential. One capacitor should be connected between
FILTAO and FILTAI, with the other connected between FILTAON and FILTAIN. Recommended capacitors are
low-inductance 1.0µF (0603 or 0805) ceramic SMT X7R devices, 6.3 WVDC or greater, with tolerance of 10%
or better.
AC Characteristics (Over recommended operating conditions)
Table 3: AC Characteristics
Parameters
Description
Min Typ Max Units
Conditions
tpd
tr,tf
tr,tf
Jittergen
Jittertol
LBW
Jitterpeak
Center of output data eye from
rising edge of CO+
-75
—
+75
ps
DO± rise and fall times
— — 150 ps 20% to 80% into 50Ω load.
CO± rise and fall times
— — 135 ps 20% to 80% into 50Ω load.
Jitter Generation (12kHz-
20MHz)
Measured at the HS data output for
— — 3.6 ps - rms jitter in the 12kHz - 20MHz band.
Assume 1.2ps rms input data jitter.
Jitter Tolerance
— — — — Exceeds SONET/SDH mask
Loop Bandwidth
— — 2.0 MHz -3dB point of jitter transfer curve
Jitter Peaking
— — 0.1 dB
G52228-0, Rev 4.1
01/05/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Internet: www.vitesse.com
Page 5
5 Page 
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC8122
Multi-Rate SONET/SDH
Clock and Data Recovery IC
Package Information
64-pin PQFP Package Drawing
F
G
64
1
49
48
16
17
IH
L
33
10o TYP
32
Item
A
D
E
F
G
H
I
J
K
10
mm
2.45
2.00
0.22
13.20
10.00
13.20
10.00
0.88
0.50
Tol.
MAX
+0.10
±.05
±.25
±.10
±.25
±.10
±.15
BASIC
A
100 TYP
0.30 RAD. TYP.
K
D
A
0.20 RAD. TYP.
STANDOFF
0.25 MAX.
0.17 MAX.
0 o - 8o
0.25
J
0.102 MAX. LEAD
COPLANARITY
E
NOTES:
Drawing not to scale.
Heat spreader up on 10mm package only.
All units in mm unless otherwise noted.
Heat spreader is not electrically connected.
Package #: 101-XXX-X
Issue #: 1
Package #: 101-XXX-X
Issue #: 1
G52228-0, Rev 4.1
01/05/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Internet: www.vitesse.com
Page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet VSC8122.PDF ] | |
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