10 Gbit/s
Receiver, CDR and
DeMUX
GD16584/GD16588
(FEC)
Preliminary
General Description
GD16584 and GD16588 are Receiver
chips for use in STM-64/192 and Optical
Transport Networking (OTN) systems.
The component is available in two ver-
sions:
u
GD16584 for 9.5328 Gbit/s.
u
GD16588 for 10.66 Gbit/s for OTN or
Forward Error Correction (FEC).
Except the different operating bit rates
the two versions are functional identical.
The receiver is a Clock and Data Reco-
very IC with:
u
a low noise VCO
u
a Bang-Bang Phase Detector
u
a 1:16 De-multiplexer
u
a Lock Detect
u
a Phase and Frequency Detector.
Clock and data are regenerated by using
a
Phase Locked Loop
(PLL) with an ex-
ternal passive loop filter.
The VCO frequency is controlled by one
of the two Phase Detectors in order to
ensure capture and lock to the line data
rate. The Lock Detector circuit monitors
the VCO frequency and determines when
the VCO is within the lock range. When
the frequency deviates more than
VCO
VCTL
Timing Control
Features
500 ppm from the reference clock, it
automatically switches the phase and fre-
quency detector into the PLL loop. In the
auto lock mode the locking range is
selectable between 500 or 2000 ppm.
When the VCO frequency is within the
lock range, the Bang-Bang Phase Detec-
tor takes over. It controls the phase of
the VCO until the sampling point of data
is in the middle of the bit period, where
the eye opening is largest. A
±40
mV
Decision Threshold Control
(DTC) is pro-
vided at the 10 Gbit/s input.
The 10 Gbit/s input data is sampled and
de-multiplexed by the 1:16 DeMUX. The
parallel output interface is synchronised
with the 622 MHz output clock. The clock
and data outputs are LVDS compatible.
The device operates from a dual -5.2 V
and +3.3 V power supply. The power dis-
sipation is 3.3 W, typical.
The device is manufactured in a Silicon
Bipolar process and packaged in an 132
balls 13 × 13 mm Ceramic Ball Grid
Array (CBGA).
CKOUT
CKOUTN
l
Complete Clock and Data Recovery
IC with auto acquisition.
1:16 DeMUX with differential
622 Mbit/s data outputs
622 MHz Clock output.
LVDS compatible clock and data
outputs.
OIF99.102.5 compliant timing.
155 or 622 MHz Reference Clock.
Input Decision Threshold Control
(DTC):
±40
mV.
Low noise VCO with ±5 % tuning
range.
Dual supply operation: -5.2 V and
+3.3 V.
Power dissipation: 3.3 W (typ).
Silicon Bipolar technology.
132 balls Ceramic BGA 13 × 13 mm
package.
Available in two versions:
– GD16584 for 10 Gbit/s
– GD16588 for 10.66 Gbit/s
l
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DO0
DON0
DI
DIN
DTC
DTCN
Decision
Threshold
Control
Bang
Bang
Phase
Detector
1:16
Demultiplexer
Parallel
Output
Data
DO15
DON15
Applications
l
U
REFCK
REFCKN
Phase
Frequency
Detector
1/4
D
PCTL
(PHIGH)
(PLOW)
l
Telecommunication systems:
– SDH STM-64
– SONET OC-192.
– Optical Transport Networking
(OTN)
– FEC applications
Fibre optic test equipment.
Submarine systems.
Lock
Detect
l
LOCK
RESET
TCK
SEL3
SEL1
SEL2
VCC
VDD
VDDA
VDDO
VEE
VEEA
Data Sheet Rev.: 08
Functional Details
The application of GD16584 is as re-
ceiver in SDH STM-64 and SONET
OC-192 optical communication systems.
It integrates:
u
a Voltage Controlled Oscillator (VCO)
u
a Bang Bang Phase Detector
u
a Lock Detect Circuit
u
a 1:16 DeMUX
u
a Phase and Frequency Detector
(PFD).
Loop Filter
A passive loop filter is used for the CMU
consisting of a resistor and a capacitor
driven from the PCTL pin. The PCTL pin
outputs the phase information from the
Bang-Bang Phase Detector. The phase
information is very high frequency pulses
(200 ps pulse width) either charging or
discharging the external capacitor.
The values of the external components
determines the characterisctics of the
PLL, e.g. bandwidth and transfer func-
tions. For recommended loop filter val-
ues, please refer to
Figure 1.
The PCB lay-out of the external loop filter
and the connecting lines between PCTL
and VCTL are
critical
for jitter perfor-
mance of the device. The external com-
ponents and the artwork should be
placed very close to the pins of the
device.
If the PHIGH and PLOW outputs are not
used they must be shorted VDD (0 V),
please refer to
Figure 1.
and DIN) whereby the DC bias voltage at
the input is adjustable by
±40
mV. Opti-
mizing the input decision threshold im-
proves the system input sensitivity by
1-2 dB typical.
The input impedance into DTC and
DTCN is 1.5 kW and when not used they
should be de-coupled to 0 V by 100 nF.
The select inputs (SEL1-3, RESET and
TCK) are low speed inputs that can be
connected directly to the supply rails (0 /
-5.2 V).
The 10 Gbit/s inputs
(DI and DIN) are
not ESD protected
and extra precau-
tions are needed when handling these in-
puts. (Internal 50
W
resistors provide
some ESD hardness making the input
low impendance.)
VCO
The VCO is an LC-type differential oscil-
lator, voltage controlled by pin VCTL and
with a tuning range of approximately
±5 %.
For GD16584, with the VCTL voltage at
approximately -3.5 V, the VCO fre-
quency is fixed at 9.953 GHz and by
changing the voltage from 0 to -5.2 V the
frequency is controlled from 8.9 GHz to
10.2 GHz. The modulation bandwidth of
VCTL is 90 MHz.
Bit Order
The serial data stream is demultiplexed
with the first received bit on DO0, the
second on DO1 and with last received bit
in a 16 bit frame on DO15. The naming is
opposite to the OIF99.102.5 recommen-
dation.
For OIF interfaces the data pins should
be connected as shown in the following
table.
Note:
The clock output is inverted in
order to refer the data cross-
ing to the rising edge of
CKOUTN
OIF:
RXDATA15_P/N
(MSB)
RXDATA14_P/N
RXDATA13_P/N
RXDATA12_P/N
RXDATA11_P/N
RXDATA10_P/N
RXDATA9_P/N
RXDATA8_P/N
RXDATA7_P/N
RXDATA6_P/N
RXDATA5_P/N
RXDATA4_P/N
RXDATA3_P/N
RXDATA2_P/N
RXDATA1_P/N
PFD
The PFD ensures predictable locking
conditions for the device. It is used dur-
ing acquisition and pulls the VCO into the
locking range where the Bang-Bang
Phase Detector acquires lock to the in-
coming bit-stream. The PFD is made with
digital set/reset cells giving it a true
phase and frequency characteristic. The
reference clock input (REFCK/REFCKN)
to the PFD is differential and selectable
between 155 MHz or 622 MHz by SEL3.
The reference clock is a CML input with
50
W
internal termination resistors to 0 V.
The reference clock is typically an X-tal
oscillator type as shown in
Figure 1.
The
reference clock input should be used dif-
ferential for best performance. If the ref-
erence clock is DC coupled the input
voltage swing is 0 V (high) and -0.4 V
(low).
Lock Detect Circuit
The lock detect circuit continuously moni-
tors the difference between the reference
clock and the VCO clock. If they differ by
more than 500 ppm (or 2000 ppm), it
switches the PFD into the PLL, to pull it
back into the locking range. The status of
the lock circuit is given by output pin
(LOCK). Manual or automatic lock is se-
lected by SEL1. In auto lock mode, the
lock range ±500 or ±2000 ppm is se-
lected by SEL2. The LOCK output is an
open collector output, and should be ter-
minated with an external resistor. The
maximum termination voltage is +3.5 V.
Output Pin:
DO0/DON0
DO1/DON1
DO2/DON2
DO3/DON3
DO4/DON4
DO5/DON5
DO6/DON6
DO7/DON7
DO8/DON8
DO9/DON9
DO10/DON10
DO11/DON11
DO12/DON12
DO13/DON13
DO14/DON14
The Inputs
The input amplifier pin (DI/DIN) is de-
signed as a gain buffer stage with high
sensitivity and internal 50
W
resistors ter-
minated to 0 V. After retiming, the data is
de-multiplexed down to 16 bit/s by
demultiplexer.
It is recommended to use the 10 Gbit/s
inputs differentially for best input
sensitivity.
The input voltage decision threshold is
adjustable by pin DTC and DTCN when
connected to a potentiometer. Adjusting
the resistor value of the meter controls
the current into DTC and DTCN. This DC
current is mirrored to the input pin (DI
Bang-Bang Phase Detector
The Bang-Bang phase detector is de-
signed as a true digital type producing a
binary output. It samples the incoming
data prior to, in the vicinity of and after
any potential bit transition.
When a transition has occurred, these
three samples tell whether the VCO clock
leads or lags the data. The binary output
is filtered through the (low pass) loop fil-
ter, performing an integration of all poten-
tial bit transitions. Hence the PLL is
controlled by the bit transition point.
Data Sheet Rev.: 08
GD16584/GD16588
Page 2 of 13
Output Pin:
DO15/DON15
CKOUT
CKOUTN
OIF:
RXDATA0_P/N
(LSB)
RXCLK_N
RXCLK_P
Thermal Condition
The device dissipates 3.3 W from a dual
voltage supply (–5.2 V and +3.3 V). The
power consumption from the -5.2 V sup-
ply is approximately 2.9 W and 0.4 W
from the +3.3 V supply.
The die is mounted in a cavity on a metal
pad directly connected to the center balls
(E4-9, F4-9, G4-9, and H4-9).
About 80% of the power is transferred
through the balls of the package and
20% through the top lid.
The thermal resistance from the die
(junction) to the back side of the package
through the balls is 10-15
°C/W
depend-
ing on the lay-out of the PCB. The ther-
mal resistance from the die to the top
side through the lid is 40
°C/W
(the fig-
ures are measured values with the pack-
age mounted on the GD90584/585
Evaluation Board and with no air-flow).
The maximum allowed case temperature
(on the top side) is 95
°C
ensuring a die
junction temperature below 125
°C,
please refer to “Maximum Ratings” on
page 9.
It is important to have a good thermal
connection from the center balls of the
package via the PCB to the ambient en-
vironment to ensure the case tempera-
ture in the range from 0 to 70 °C.
The Outputs
The data and clock outputs are LVDS
compatible outputs with internal bias re-
sistors (500
W)
to VCC (+3.3 V)
Refer to item “LVDS Compatible Inter-
face” on
page 6.
Timing to System ASIC
The timing between GD16584 and the
system ASIC at 622 Mbit/s is controlled
by the 622 MHz output clock synchro-
nized with the output data. The clock is
used as the input clock to the ASIC,
clocking the input data into 16 parallel
registers. The timing relation between the
clock and data is given by the AC
Characteristics.
For a OIF99.102.5 complaint timing the
output clock should be inverted by using:
u
CKOUTN
as the
positive
output clock
(RXCLK_P), and
u
CKOUT
as the
negative
output clock
(RXCLK_N)
External Circuit
The external circuits needed to make the
device work as a complete clock and
data recovery with automatic acquisition
are:
u
A passive loop filter
u
An X-tal oscillator or reference clock
(155 MHz or 622 MHz)
u
De-coupling capacitors
10.66 Gbit/s Application
A version of the transmitter with a bit rate
of 10.66 Gbit/s for forward error correc-
tion application is available. The part
number is GD16588.
The functionality and the pin-out are
identically to GD16584.
The center frequency of the VCO
(10.66 GHz) is the only difference to
GD16584.
Package
The device is packaged in an 132 balls
Ceramic BGA (13 × 13 mm). For the
package outline, please refer to
the figure on
page 12.
The following pin pairs are individually
shorted inside the package and mainly
used as power pins:
C3/D3, C4/D4, C5/D5, C8/D8, C9/D9,
C10/D10, J3/K3, J4/K4, J5/K5, J8/K8,
J9/K9, and J10/K10.
Data Sheet Rev.: 08
GD16584/GD16588
Page 3 of 13
Applications
1
+3.3V
0V
VDD/VDDA/VDDO
TCK
RESET
VCC
0V
-5.2V
1
0
0V
-5.2V
0V
-5.2V
50
W
MSL
VDD
50
W
MSL
Framer
SEL1
SEL2
SEL3
CKOUT
CKOUTN
DO0..DO15
DON0..DON15
16
16
1
0
10Gbit/s
CML Driver
DI
DIN
GD16584/GD16588
0V
VDD
220
DTC
10k
0V
LOCK
330W
VREF
VDD
+
-
-5.2V
DTCN
REFCK
14
8
7
330
43
100nF
XO-PECL
155/622 MHz
KVG
-5.2V
500W
-5.2V
PLOW
REFCKN
PHIGH
VCTL
PCTL
150W 33nF
100nF
500W
VDDA
-5.2V
-5.2V
VEE/VEEA
-5.2V
Figure 1.
Application Information.
VDD
VEE
VDDO
VEEA
Pin A1
C
Pin A4
C
C
C
C
VDD pins refer to Pin List
C
C
C
C
C
Pin K4 Pin M12
C
C
10
m
F
Pin C2
C
Pin B2
C
VDDA
10
m
F
VCC
VDD
Pin D11 Pin K12
C
C
10
m
F
C is 1000nF parallel with 100pF.
VEE pins refer to the Pin List; VEEA pins C3 and D3
Figure 2.
De-coupling of the Power Supply.
GD16584/GD16588
Page 4 of 13
Data Sheet Rev.: 08
Applications Continued
10 Gbit/s Input Interface
Postamplifier
GD16584/GD16588
0V
0V
50W
0/-0.4V
0/-0.4V
50
W
MSL
DI
DIN
50W
50W
>16mA
-5.2V
Figure 3.
10 Gbit/s Input (DI/DIN), DC Coupled
GD16584/GD16588
0V
-5.2V
50W
50W
Post-
amplifier
50
W
MSL
220W
DI
100nF
220W
-5.2V
-5.2V
DIN
Figure 4.
10 Gbit/s Input (DI/DIN), AC Coupled
Data Sheet Rev.: 08
GD16584/GD16588
Page 5 of 13
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