GN2014A Datasheet, PDF (8/18 Pages) Gennum Corporation – XFP Tx Signal Conditioner with VCSEL Driver

3. Detailed Description
3.1 Typical Electrical Application Schematic
R5 (Note 1)
VCC
3.9
4.7μ
Loss of Lock
Loopback Enable
From/To Controller
Polarity Inversion
R (Note 5)
R (Note 5) 1k
1k
Retimer Enable ^{R (Note 5)}
1k
C12
C1
C2
220n
100n
R1 (Note 3)
open
R2 (Note 3)
68.1k
EQInP
EQInN
C7
100n
C10
100n
VCC
C5
10n
1
POLInv
2
RTEn
3 _EQVcc
4
EQVee
5
EQInP
6
EQInN
U1
GN2014A
18
LBSDOP
17
LBSDON
16
SDOP
15
SDON
14
SDOVee
13
SDOVcc
LBSDOP _{To GN2003S}
LBSDON (Note 2)
C8
10n
VCC
C6
100n
C9
100n
SDOP
SDON
From/To Controller
Output Swing Select
R3
11k
Cross Point Adjust Polarity
Laser Driver Disable (Note 4)
Cross Point Adjust
DAC
C11
VCC
C12
100n
10n
R (Note 5)
1k
R (Note 5)
R4
1k
10k
C13
100n
Notes:
1. All passive components are surface mount components with the 0402 footprint size.
2. AC coupling between Loop Back I/Os is recommended for new designs.
3. Value of this component should be optomized according to design requirements.
4. Laser Driver Disable may be connected directly to ground.
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
39260 - 8
May 2010
8 of 18
Proprietary & Confidential