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GD16522-48BA Datasheet

  • GD16522-48BA

  • CLOCK/DATA RECOVERY|BIPOLAR|QFP|48PIN|PLASTIC

  • 12頁

  • ETC

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an Intel company
2.5 Gbit/s
Clock and Data
Recovery
GD16522
General Description
The GD16522 is a high performance
monolithic integrated multi-rate
Clock
and Data Recovery
(CDR) device appli-
cable for optical communication systems
including:
u
SDH STM-16 / 4 / 1
u
SONET OC-48 / 12 / 3
u
Gigabit Ethernet
The GD16522 features:
u
Limiting input amplifier.
u
Analogue peak level detection circuit.
u
Digital Loss Of Signal (LOS) monitor
circuit with four selectable threshold
settings.
u
Consecutive Identical Binary Digit
alarm output.
The device also features an additional
high-speed data input for serial loop-back
diagnostic tests.
The CDR contains all circuits needed for
reliable acquisition and lock of the VCO
phase to the incoming data-stream.
The electrical input sensitivity is better
than 8 mV (BER <10
-10
).
The device exceeds all ITU-T and
Bellcore IEEE jitter requirements when
used with the recommended loop filter
(jitter tolerance, -transfer and -genera-
tion).
The output clock (2.488 GHz when
STM-16 data input is selected) is main-
tained within 500 ppm tolerance of the
reference frequency in the absence of
data.
The GD16522 is available in 48 lead
7 脳 7 mm TQFP power enhanced plastic
package.
VCTL
BRS0
BRS1
SELTCK
VCC
VCCL
VCCO
VCCP
VCCV
Features
l
Exceeds ITU-T and Bellcore require-
ments of Jitter Transfer, Generation
and Tolerance.
Integrated Limiting Amplifier.
Digital LOS monitor and alarm output.
Bit Consecutive Detect Output.
Multi-rate data input.
Differential CML data input with inter-
nal 50
W
load termination.
Control inputs are LVTTL.
Reference clock selectable:
鈥?155.52 MHz
鈥?38.88 MHz
Single supply operation: +3.3 V.
High-speed serial loop-back input.
Output signal shutdown input.
Available in 48 pin TQFP package
(7 脳 7 mm).
l
l
l
l
l
l
l
l
l
DEC_ADJ SD_SEL
TCK
l
l
MON
MON_REF
SDIP
DIREF
SDIN
DIREFN
Peak
Detect
VCO
Divider
MUX
Limiting
Amplifier
B.B
Phase
Detector
SCOP
SCON
SDOP
SDON
Applications
l
SDOWN_G
SDOWN_L
SLBIP
SLBIN
SBER0
SBER1
1/4
Amplifier
BEF
Lock
Detect
Continuous
Bit
Detector
Clock and Data Recovery for optical
communication systems including:
鈥?SDH STM-16 / 4 / 1
鈥?SONET OC-48 / 12 / 3
鈥?Gigabit Ethernet
BC_DET
LOCK_DET
LOS_DET
RCIP
RCIN
MUX
Phase
Frequency
Detect
MUX
PCTL
VEE
VEEL
VEEP
VEEV
REF_SEL
CDR_SEL
Data Sheet Rev.: 21

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