GN2014A Datasheet, PDF (11/18 Pages) Gennum Corporation – XFP Tx Signal Conditioner with VCSEL Driver

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 #
11
Pin Symbol
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.
GN2014A XFP Tx Signal Conditioner with VCSEL Driver
Data Sheet
39260 - 8
May 2010
11 of 18
Proprietary & Confidential