Micro Networks
An Integrated Circuit Systems Company
M831 Series
Preliminary Specifications
M831 Series
9.953 Gbit OC-192 Clock & Data Recovery Receiver Module
DESCRIPTION
The M831 Series is specifically designed to
regenerate the spectral component from an in-
coming NRZ data stream and output a low-jitter
clock and retimed complementary data.
The module utilizes a phase-lock loop architecture
incorporating a high-stability, low noise SAW VCO
to provide extremely low jitter clock and data
outputs. The incoming data is frequency doubled to
recover the clock component. The clock signal is
then filtered by a microwave band pass filter to
remove wide band noise and spurious signals. This
signal is further filtered using the wide band SAW
VCO based PLL to minimize the noise close to the
carrier. The low jitter clock is then used to retime
the data and serves as the module’s clock output.
The module provides user controlled clock phase
shifter and output data crossover adjustments to
optimize system performance.
PLL lock-in range and loop transfer characteristics
are optimized for minimal jitter in accordance with
ITU and Bellcore standards for SONET/SDH
systems.
FEATURES
Superior SAW VCO-based PLL jitter
performance
9.5 ps peak-to-peak jitter
0.9 Vp-p complementary data outputs
1 UI externally adjustable clock phase
200 mVp-p input sensitivity
Optional adjustable bias at data input to
decision circuit
Externally adjustable decision threshold
APPLICATIONS
ABSOLUTE MAX RATINGS
Operating Temp. Range (Case) ............................. 0°C to +70°C
Storage Temp. Range (Ambient) ..................... -40°C to +125°C
Power Supply Voltage
Vcc: ...................................................... +5.25Vdc
Vee: ...................................................... -5.25Vdc
Ref Voltage ..................................................... +0.3V to -1.6V
Phase Shift Control .............................................. -1.0V to +18V
ISO 9001
Registered
SONET OC-192 and SDH STM
Receiver Clock and Data Recovery
Applications
Micro Networks
324 Clark Street
Worcester, MA 01606
tel: 508-852-5400
fax: 508-852-8456
www.micronetworks.com
Micro Networks
An Integrated Circuit Systems Company
SPECIFICATIONS
M831 Series
Preliminary Specifications
Specifications @ Vcc = +5.0 Volts, Vee = -5.0 Volts, Data in = 2
31
-1 PRBS NRZ,
Mark ratio = 1:2, and Ta = +25
°
C unless otherwise specified
PARAMETER
Min.
Typ
Max
Units
Condition
Data Rate
Data Input Level (mVp-p)
Data Input Return Loss
Data Output Voltage (p-p)
Data Output Jitter
Data Output Duty Cycle Distortion
Data Output Rise Time (20% to 80%)
Data Output Fall Time (20% to 80%)
Data Output Return Loss
P
LL
Loop BW
Decision Threshold Control
Decision Threshold Control
Voltage Range
Clock Output Level
Clock Phase Control
Clock Phase Control Voltage
Clock SSB Phase Noise
@100Hz Offset
@1kHz Offset
@10kHz Offset
Clock Jitter
Spurious Output
Harmonic Output
Supply Voltage
Vcc
Vee
Supply Current
Icc
Iee
+4.75
-5.25
-0.75
800
1
0
10
10
750
200
9.9532
600
10
900
9.5
2.5
25
25
12
2
90
12
1100
10.5
5
35
35
Gb/sec
mVp–p
dB
mVp–p
psec p–p
%
psec
psec
dB
MHz
%
NRZ
Single-ended, 50Ω, AC coupled
50MHz to 7GHz
Data & Data
2
7
–1 PRBS NRZ
50Ω, AC coupled
50Ω, AC coupled
50MHz to 7GHz
Relative to max Data Input Voltage
Ref -0.2 to -0.75V
-0.2
1200
1400
+15
-70
-85
-90
9
-50
-30
+5.0
-5.0
450
300
+5.25
-4.75
600
550
10
V
mVp-p
UI
V
dBc/Hz
dBc/Hz
dBc/Hz
psec p–p
dBc
dBc
V
V
mA
mA
Internal load of 45Ω to -0.45V
50Ω, AC coupled
10kΩ, minimum load impedance
2
31
–1 PRBS NRZ
2
7
–1 PRBS NRZ
Micro Networks
324 Clark Street
Worcester, MA 01606
tel: 508-852-5400
fax: 508-852-8456
www.micronetworks.com
Micro Networks
An Integrated Circuit Systems Company
BLOCK DIAGRAM
M831 Series
Preliminary Specifications
The MNC clock and data recovery module has a SAW
VCO based phase-lock loop architecture. The
1.244GHz fundamental VCO is implemented as a
transmission oscillator. The oscillator loop includes
the SAW resonator that has a linear phase with
frequency characteristic, a linear voltage controlled
phase shifter, loop amplifier, and power divider to
couple signal from the loop. The oscillator is
frequency doubled to 2.488GHz and band pass
filtered. The 2.488GHz is then multiplied by four to the
final frequency of 9.953GHz. The output of the VCO is
power divided to provide an input to the phase
detector and a clock signal.
The input data is power divided to provide inputs to
the decision circuit and the clock recovery circuitry.
The input to the clock recovery circuit is amplified and
applied to an analog frequency doubler to extract a
clock spectral component from NRZ data input
stream. The 9.953GHz doubler output is band pass
filtered and amplified.
One VCO output and the clock extracted from the
input data serve as inputs to a microwave phase
detector. The phase detector output is applied to an
integrator circuit. The integrator output controls the
phase shifter in the SAW VCO, completing the phase-
locked loop. The phase-locked loop causes the low
noise VCO output to be phase locked to the clock
signal extracted from the NRZ input data, providing a
low jitter clock signal.
The clock signal is applied to a phase shifter that
allows the timing between the input data and clock to
be adjusted for optimum performance. The phase
shifter output is amplified and band pass filtered to
provide a low jitter and low spurious clock. The clock
is power divided to provide the clock output of the
module and the clock input to the decision circuit.
The decision circuit is a high speed D flip-flop. In
addition to the clock and data inputs, a user
adjustable decision threshold voltage is available. This
voltage is used to optimize the retimed data. The CDR
threshold and phase shifter do not require adjustment
over the temperature and input data level ranges.
The clock output of the CDR is a low spurious
sinusoidal signal and the complementary data outputs
are AC coupled ECL signals. DC coupled ECL
compatible data outputs are available.
Micro Networks
324 Clark Street
Worcester, MA 01606
tel: 508-852-5400
fax: 508-852-8456
www.micronetworks.com
Micro Networks
An Integrated Circuit Systems Company
DATA OUTPUT EYE DIAGRAM
M831 Series
Preliminary Specifications
Data Output Eye Diagram
CLOCK SPECTRUM
Narrow Band Clock Spectrum
Wide Band Clock Output Spectrum
Micro Networks
324 Clark Street
Worcester, MA 01606
tel: 508-852-5400
fax: 508-852-8456
www.micronetworks.com
Micro Networks
An Integrated Circuit Systems Company
ORDERING INFORMATION & MECHANICAL DIMENSIONS
Part Number:
Series
No of Inputs
D = single input
Frequency
Temperature Range
K = 0 to 70°C
Package Type
C = case/module
M831X XXXX.XXX X X
Symbol
DATA IN
DATA OUT
DATA OUT
CLK OUT
PHASE ADJ
REF
LOC DEC
+5V
-5V
GND
Name
Data Input
Data Output
(non-inverted)
Data Output
(inverted)
Clock Output
(sinusoidal)
Phase Shift
Adjust
Decision Threshold
Adjustment
Lock Detect
+5V power supply
-5V power supply
Power Supply
Ground Connection
M831 Series
Preliminary Specifications
PIN DESCRIPTIONS
Description
AC coupled 50Ω data input
AC coupled 50Ω data output
AC coupled 50Ω data output
AC coupled 50Ω clock output
User input to phase shift the recovered clock over
a 100ps range. The control voltage range is 0 to 15V.
User input to adjust the decision circuit
threshold. The control range is -0.2V to -.0.75V.
TTL output indicating PLL loss of lock. TTL “1” indicates
lock. TTL “0” indicates loss of lock.
Positive power supply input.
Negative power supply input.
Ground lug to allow connection of power supply
returns to case ground.
Micro Networks makes no assertion or warranty that the circuitry and the uses thereof disclosed herein are
non-infringing on any valid US or foreign patents. Micro Networks assumes no liability as a result of the use
of said specifications and reserves the right to make changes to specifications without notice. Contact your
nearest Micro Networks sales representative office for the latest specifications.
Micro Networks
An Integrated Circuit Systems Company
324 Clark Street Worcester, MA 01606 tel: 508-852-5400 fax: 508-852-8456
European Sales Headquarters Hertogsingel 20 6214 AD Maastricht The Netherlands tel: +31-43-32-70912 fax: +31-43-32-70715
Micro Networks 324 Clark Street Worcester, MA 01606 tel: 508-852-5400 fax: 508-852-8456 www.micronetworks.com
www.micronetworks.com
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