GENNUM GN2014A

GN2014A XFP Tx Signal Conditioner with VCSEL Driver
Features
Applications
•
•
•
•
•
•
•
•
•
•
•
•
•
•
XFP Datacom Compliant Transmit Signal Conditioner
Integrated VCSEL driver with Cross Point Adjust
functionality to optimize optical performance
Single 3.3V supply
Power dissipation: 300mW (typical, assuming 700mVppd
data output amplitude)
Multi-rate operation: 9.95Gb/s – 11.3Gb/s
No reference clock required
Laser shut down option
Automatic input offset correction
On chip 100Ω differential I/O termination
Loss of Lock indicator
Loopback differential output
CDR Bypass Option
Bit Inversion capability
Transmit path signal conditioner for XFP and SFP+
transceiver modules
General Description
The GN2014A is a transmit path signal conditioner with
integrated VCSEL driver designed to offer power and cost
savings relative to external laser driver solutions. The
GN2014A provides integrated modulation and eye shaping
capability while maintaining pin compatibility with
previous generation parts.
RTEn
LBEn
POLInv
LBOP
DC OFFSET
CORRECTION
CIRCUIT
LBO
BUF
0
EQIP
EQIN
LBON
S
SDOP
MUX
D
EQUALIZER
PHASE
DETECTOR
LOS CIRCUIT
(Note 1)
CHARGE PUMP/
LOOP FILTER
VCO
CLK
Q
SDO
BUF
INVERTER
SDON
1
LOCK
DETECTOR
LOS
LDDisable
LBWCtrl
LOL
LF
SWNGSel
Note 1: The LOS Threshold is set by defualt to 100mVppd.
CPA
CPAPol
Figure A: GN2014A Block Diagram
LINE CARD
LINE CARD
XFP MODULE
10Gb/s
GN2014A
SERDES/
ASIC
10Gb/s
GN2003S
TIA
GN1052
XFP MODULE
LASER
DIODE
PHOTO
DIODE
PHOTO
DIODE
LASER
DIODE
TIA
GN1052
10Gb/s
GN2003S
SERDES/
ASIC
10Gb/s
GN2014A
Figure B: Typical Usage
GN2014A XFP Tx Signal Conditioner with VCSEL Driver
Data Sheet
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May 2010
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Contents
Features.................................................................................................................................................................1
Applications.........................................................................................................................................................1
General Description ..........................................................................................................................................1
1. Pin Configuration and Descriptions........................................................................................................3
2. Electrical Characteristics ............................................................................................................................5
2.1 DC Electrical Characteristics ........................................................................................................6
2.2 AC Electrical Characteristics ........................................................................................................7
3. Detailed Description.....................................................................................................................................8
3.1 Typical Electrical Application Schematic .................................................................................8
3.2 VCO Supply Recommendations ..................................................................................................9
3.3 Control Interface ...............................................................................................................................9
3.3.1 GN2014A Laser Driver Power Down.......................................................................... 11
3.4 GN2014A Data Output Driver Swing Control ...................................................................... 11
3.5 GN2014A Cross Point Adjust ..................................................................................................... 13
4. Packaging and Ordering Information.................................................................................................. 15
4.1 Package Dimensions ..................................................................................................................... 15
4.2 Ordering Information ................................................................................................................... 17
Revision History .............................................................................................................................................. 17
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24
23
22
21
20
19
LBEn
LOL
VCOVee
VCOVcc
LF
LBWCtrl
1. Pin Configuration and Descriptions
1
POLInv
LBSDOP
18
2
RTEn
LBSDON
17
3
EQVcc
SDOP
16
GN2014A
SDOVee
14
6
EQInN
SDOVcc
13
CPA
EQInP
LDDisable
5
CPAPol
15
SWNGSel
SDON
PDVee
EQVee
PDVcc
4
7
8
9
10
11
12
Figure 1-1: GN2014A Pin Configuration
Table 1-1: Pin Descriptions
Pin#
Pin Symbol
Description
1
POLInv
SDO Output Polarity Inversion Control Input
2
RTEn
Retimer Enable Control Input
3
EQVcc
Equalizer Power Supply
4
EQVee
Equalizer Ground
5
EQInP
Serial Data Input (Positive)
6
EQInN
Serial Data Input (Negative)
7
PDVcc
CDR Power Supply
8
PDVee
CDR Ground
9
SWNGSel
Serial Data Output Amplitude Select Control Input
10
CPAPol
Cross Point Adjust Polarity
11
LDDisable
Laser Driver Power Down
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Table 1-1: Pin Descriptions (Continued)
Pin#
Pin Symbol
Description
12
CPA
Cross Point Adjust
13
SDOVcc
SDO Output Buffer Power Supply
14
SDOVee
SDO Output Buffer Ground
15
SDON
Serial Data Output (Negative)
16
SDOP
Serial Data Output (Positive)
17
LBSDON
Loop Back Serial Data Output (Negative)
18
LBSDOP
Loop Back Serial Data Output (Positive)
19
LBWCtrl
PLL Loop Bandwidth Control Input
20
LF
PLL Loop Filter Capacitor
21
VCOVcc
VCO Power Supply
22
VCOVee
VCO Ground
23
LOL
Loss of Lock Monitor Output
24
LBEn
Loop Back Enable Control Input
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2. Electrical Characteristics
Table 2-1: Absolute Maximum Ratings
Parameter
Value
Supply Voltage, VCC
-0.3V to 3.6V
Input Voltage Range
-0.3 to VCC+0.3
ESD Protection (including high-speed I/Os)
2kV (HBM)
Operating Temperature Range, TC
-40°C to 95°C
Reflow Profile (Tmax)
255°C + 5°C (3 sec)
Storage Temperature
-40°C to 100°C
NOTE: Stress above those listed under Absolute Maximum Ratings may cause permanent
damage to the device. This is a stress rating only and functional operation of the device at
these or any other conditions above those listed in the operational sections of this
specification is not applied. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
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Data Sheet
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2.1 DC Electrical Characteristics
Table 2-2: DC Electrical Characteristics
VCC = +2.8V to +3.47V, TC = -40°C to 95°C. Typical values are at VCC = +3.3V and TA = 25°C, unless otherwise specified.
Note: mVppd refers to mV peak-to-peak differential value.
Parameter
Symbol
Min
Typ
Max
Units
VCC
-15%
3.3
+5%
V
–
–
–
300
485
mW
–
VIN
120
–
1000
mVppd
–
80
100
120
Ω
Output Amplitude
–
300
(3mA
mod
current)
–
1500
(15mA
mod
current)
mVppd
Output Termination
–
80
100
120
Ω
Output with LDDisable =
HIGH
–
–
–
100
μAppd
Swing Select Input Current
–
0
–
150
μA
Required for 0 – 1400mVppd
output range
CPA Input Current
–
–
–
250
μA
Required for up to 25%
change
V0LB
160
195
300
mVppd
–
80
100
120
Ω
IOLB
–
3.9
–
mA
–
Supply Voltage
Power Consumption
Note
CML Input Specifications
Input Amplitude
Input Termination
Note 1, Note 2
Differential
CML SDO Output Specifications
Controlled using Voltage to
SwingSel, LDDisable = LOW
Differential
–
CML LBSDO Output Specifications
Output Amplitude
Output Termination
Output Buffer Switching
Current
AC coupled with the LBSDI
from GN2003S
Differential
Control Logic Input Specifications
Input Low Voltage
VIL
0
–
0.8
V
–
Input High Voltage
VIH
2.0
–
VCC
V
–
Input Low Current
IIL
–
-100
–
μA
VIL = 0V
Input High Current
IIH
–
100
–
μA
VIH = +3.3V, VCC = 3.3V
Notes:
1. XFP MSA Revision 4.0 (Table 17).
2. If input signal is below 100mV threshold, LOL may trigger.
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Data Sheet
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2.2 AC Electrical Characteristics
Table 2-3: AC Electrical Characteristics
VCC = +2.8V to +3.47V, TC = -40°C to 95°C. Typical values are at VCC = +3.3V and TA = 25°C, unless otherwise specified.
Note: mVppd refers to mV peak-to-peak differential value.
Parameter
Symbol
Min
Typ
Max
Units
Input Data Rate
–
9.95
–
11.3
Gb/s
NRZ
Input Sinusoidal Jitter
Tolerance
–
2.4
12.7
–
UIpp
f = 120kHz, Note 1
–
0.07
0.6
–
UIpp
f = 4MHz
–
0.07
0.45
–
UIpp
f = 80MHz
Equalization Gain
–
6
–
–
dB
Jitter Transfer Bandwidth
Setting Range
–
1
–
8
MHz
Jitter Peaking
–
–
–
0.03
dB
Total Output Jitter
–
–
0.1
0.15
UIpp
tr, tf
–
–
30
ps
20% - 80%
–
–
10
20
ms
–
SDO Output Rise/Fall Time
Lock Time
Note
Note 2
PRBS 231-1 Data (Note 3)
All Frequencies
(with 8MHz LBW)
–
Notes:
1. At jitter frequencies <120kHz the GN2014A jitter tolerance performance exceeds the XFI module transmitter input telecom sinusoidal jitter
tolerance specifications (XFP MSA Revision 4.0, Figure 16).
2. At 5.35GHz (dielectric loss)
3. 8MHz bandwidth can be obtained using the loop filter components R1, R2. The values for these components should be selected at module
level.
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Data Sheet
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3. Detailed Description
3.1 Typical Electrical Application Schematic
R5 (Note 1)
VCC
3.9
C12
4.7μ
C2
220n
C1
100n
Loss of Lock
Loopback Enable
From/To Controller
R1 (Note 3)
open
R2 (Note 3)
68.1k
R (Note 5)
R (Note 5) 1k
Polarity Inversion
19
LBWCtrl
20
LF
21
VCOVee
VCOVcc
SDOVcc
7
PDVcc
100n
CPA
EQInN
12
EQInN
SDON
SDOVee
LDDisable
6
SDOP
EQInP
11
100n
C10
EQVee
CPAPol
5
10
4
U1
GN2014A
EQVcc
8
C7
EQInP
LBSDON
RTEn
SWINGSel
3
C5
10n
LBSDOP
POLInv
PDVee
2
9
1
VCC
22
23
LBEn
1k
LOL
24
1k
Retimer Enable R (Note 5)
18
LBSDOP
17
LBSDON
To GN2003S
(Note 2)
16
C6
SDOP
100n
15
C9
14
C8
10n
13
SDON
100n
VCC
Notes:
1. All passive components are surface mount components with the 0402 footprint size.
C11
Output Swing Select
Cross Point Adjust Polarity
From/To Controller
R3
11k
Laser Driver Disable (Note 4)
Cross Point Adjust
2. AC coupling between Loop Back I/Os is recommended for new designs.
VCC
C12
100n
10n
3. Value of this component should be optomized according to design requirements.
R (Note 5)
1k
R4
4. Laser Driver Disable may be connected directly to ground.
R (Note 5)
1k
DAC
10k
C13
100n
5. This resistor should be populated only if any of the following conditions apply:
w This particular input is controlled by a separate supply source
w This particular input is controlled by the device powered using a separate
source and its output is capable of sourcing current >40mA
Figure 3-1: GN2014A Typical Electrical Application Schematic
The application schematic for the GN2014A is highly related to the GN2004S.
GN2014A XFP Tx Signal Conditioner with VCSEL Driver
Data Sheet
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3.2 VCO Supply Recommendations
When the Host Board Power Supply output is used to power the GN2014A device,
additional filtering for the VCOVcc supply input is recommended.
This filtering is required to improve power line noise rejection.
Typically, a 1st order RC filter provides sufficient supply noise attenuation (i.e. R5, C1
and C12 in Figure 3-1).
The capacitor C1 = 100nF
The capacitor C12 = 4.7μF
The maximum value of the resistor R5 can be calculated using the following
information:
•
Minimum operational voltage (after regulation and including supply noise) at the
VCOVcc supply input (pin 21): VCOVcc (min) = 2.74Vdc
•
Maximum operational current into the VCOVcc supply input:
IVCOVcc (max) = 14.9mA
Example 3-1: Calculating Resistor Values
Vcc = 2.8Vdc.
R5 (max) = (Vcc - VCOVcc (min)) / IVCOVcc (max) = 60mV / 14.9mA = 4Ω
The closest lower standard resistor value, which can be used for R5 is 3.9Ω.
When an external LDO voltage regulator is used to power the GN2014A device, R5 =
3.3 Control Interface
The GN2014A control interface consists of five inputs that determine the mode in which
the device is operating:
•
Polarity Inversion (POLInv)
•
Loop Back Enable (LBEn)
•
Retimer Enable (RTEn)
•
Cross Point Adjust Polarity (CPAPol)
Table 3-1 describes the conditions at these inputs to enable or disable a particular mode.
Figure 3-2 shows a simplified equivalent circuit common for all control inputs.
GN2014A XFP Tx Signal Conditioner with VCSEL Driver
Data Sheet
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V cc
Vcc
Iref
C P A P ol
1.5k
POLInv or
1 .5 k
V re f
Vref
LBEn or
RTEn
Figure 3-2: GN2014A Control Input Equivalent Circuits
When left unconnected, the POLInv, LBEn and RTEn input level defaults to logic HIGH
and the CPAPol input defaults to logic LOW (see Figure 7-1).
Note: Since the GN2014A device is specified to operate at VCC values down to 2.8V,
special care must be taken when driving control inputs from a controller that uses
separate supply line. Under no condition should the controller's VOH exceed GN2014A's
VCC + 0.3V.
Table 3-1: Operational Modes
Pin#
Pin Symbol
1
POLInv
Description
Serial Data Output Polarity Inversion Control Input
0 → Inverted Polarity (SDOP/LBSDOP = EQInN and
SDON/LBSDON = EQInP)
1 → Normal Polarity (SDOP/LBSDOP = EQInP and
SDON/LBSDON = EQInN)
2
RTEn
Retimer Enable Control Input
0 → CDR Bypassed
1 → CDR In Path
10
CPAPol
Cross Point Adjust Polarity Control Input
0 → Negative Cross Point Adjust
1 → Positive Cross Point Adjust
24
LBEn
Loop Back Enable Control Input
0 → Loop Back Disabled (Data available only on
SDOP/SDON)
1 → Loop Back Enabled (Data available on SDOP/SDON
and LBSDOP/LBSDON)
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Data Sheet
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3.3.1 GN2014A Laser Driver Power Down
LDDisable is a digital control pin which is used to shut down laser modulation when set
to HIGH (default level). When set to LOW, the driver operates normally.
Table 3-2: Control Logic Input Specifications
Pin #
Pin Symbol
11
LDDisable
Description
Laser Driver Power Down
1 → Laser Driver power down (Default)
0 → Laser Driver enabled
3.4 GN2014A Data Output Driver Swing Control
The GN2014A Data Output amplitude is controlled using the SWNGSel control pin.
The SWNGSel control application circuit is shown in Figure 3-3.
Output voltage from a DAC, applied to the SWNGSel control input via external resistor
R3, is used to control the Data Output amplitude of the GN2014.
Table 3-3 shows expected GN2014A Data Output amplitude for a given SWNGSel
voltage.
Note: The DAC should be able to source up to150μA of current.
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Data Sheet
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Digital to Analog
Converter
0V to 3.0V
C 12
R3
100nF
See Table 3-3 for more details
11k
9
SWNGSel
10k
To Current Mirror
Q1
Q2
1k
1k
GN2014A
Figure 3-3: GN2014A SWNGSel Control Application Circuit
Table 3-3: GN2014A Output Amplitude vs. Swing Select Voltage
Swing Select Voltage at
DAC
(assumes 11kΩ resistor in
series)
GN2014A Output
(Typical, LDDisable LOW)
0-0.8
Soft turn on
1.2V
150mVpp single ended
3mA modulation current
1.8V
350mVpp single ended
7mA modulation current
2.3V
500mVpp single ended
10mA modulation current
2.8V (Recommended Max)
750m Vpp single ended
15mA modulation current
3.3V (Reliability Max)
Not Recommended
18mA modulation max
current
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Data Sheet
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3.5 GN2014A Cross Point Adjust
The GN2014A cross point adjust is used to pre-distort the output signal to optimize
optical performance. This is accomplished using two control pins:
1. CPAPol (Pin 10) — Controls direction of crosspoint change, digital pin
2. CPA (Pin 12) — Controls magnitude of crosspoint change, analog control
With CPA voltage set to nominal 0.8V, the output waveform will have a cross point at the
50% level, as indicated in Figure 3-4.
75%
50%
Crossing Point
is at 50% Level
25%
0ps
60ps
120ps
180ps
Time (s)
Figure 3-4: GN2014A Output Signal with CPA voltage set to 0.8V
To increase the cross point to the 75% level, the CPA polarity (pin 10:CPAPol) must be set
HIGH, and the CPA voltage (pin 12:CPA) increased to 3.1V. This results in the output
waveform illustrated in Figure 3-5.
Crosspoint
75%
50%
25%
0ps
60ps
120ps
180ps
Time(s)
Figure 3-5: GN2014A Output Signal when CPA Polarity control input is set
HIGH, CPA = 3.1V
The cross point can be set to an intermediate level between 50% and 75% by setting the
CPA to a voltage between 0.8V and 3.1V.
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Data Sheet
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To decrease the cross point to the 25% level, the CPA polarity (pin 10:CPAPol) must be
set LOW, and the CPA voltage (pin 12:CPA) increased to 3.1V. This results in the output
waveform illustrated in Figure 3-6.
Crosspoint
75%
50%
25%
0ps
60ps
120ps
180ps
Time(s)
Figure 3-6: GN2014A Output Signal when CPA Polarity control input is set
LOW, CPA = 3.1V
The cross point can be set to an intermediate level between 50% and 25% by setting the
CPA to a voltage between 0.8V and 3.1V.
Note: When the CPA Control function is not used, connect CPA (pin 12: CPA) to VCC
using a 200KΩ resistor. The CPAPol pin (pin 10: CPAPol) may be left open.
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Data Sheet
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4. Packaging and Ordering Information
4.1 Package Dimensions
Figure 4-1 shows the GN2014A footprint.
4.0
Package Outline
0.25
Pin1
0.25
2.1
C.L. of package
4.0
3.8
0.5
C.L. of package
2.1
Metal Area for Paddle Ground
0.5
3.8
NOTES:
1. Controlling dimensions in mm.
2. Dimension tolerances are ±0.1
unless otherwise specified.
PAD DETAILS
0.3
0.3
0.6
0.6
Figure 4-1: GN2014A Footprint
GN2014A XFP Tx Signal Conditioner with VCSEL Driver
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Figure 4-2: Package Information
GN2014A XFP Tx Signal Conditioner with VCSEL Driver
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Pin 1
Indicator
GN2014A
XXXXE3
YYWW
GENNUM
GN2014A
XXXX
YYWW
E3
Package Mark
Last 4 digits of work order
Date Code
Pb-free indicator
Figure 4-3: Package Marking
4.2 Ordering Information
Part Number
Package
Case Temperature
GN2014ACNE3
24-pin QFN
-40°C to +95°C
Revision History
Version
ECR
Date
Changes and / or Modifications
3
144211
February 2007
Updated Table 8.1
4
144650
March 2007
Missing information on CPAPol
5
145750
June 2007
Update ESD info, remove reference to Swing
Select Control Input in Section 7
6
148393
November 2007
Close CAR #5632
7
152775
October 2009
Changed Figure 4-2: Package Information.
8
154165
May 2010
Converted document back to Data Sheet.
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DOCUMENT IDENTIFICATION
CAUTION
DATA SHEET
ELECTROSTATIC SENSITIVE DEVICES
The product is in production. Gennum reserves the right to make changes to
the product at any time without notice to improve reliability, function or
design, in order to provide the best product possible.
DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A
STATIC-FREE WORKSTATION
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Gennum Corporation assumes no liability for any errors or omissions in this document, or for the use of the circuits or devices described herein. The sale of
the circuit or device described herein does not imply any patent license, and Gennum makes no representation that the circuit or device is free from patent
infringement.
All other trademarks mentioned are the properties of their respective owners.
GENNUM and the Gennum logo are registered trademarks of Gennum Corporation.
© Copyright 2006 Gennum Corporation. All rights reserved.
www.gennum.com
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