GS2985 Datasheet, PDF (9/45 Pages) Gennum Corporation – Uses standard 27MHz crystal

Table 1-1: GS2985 Pin Descriptions
Pin Number
56
Name
SCK/EQ2_EN
Type
Input/Logic
Input
57
SDO/EQ1_EN
Input/Logic
Input
58
SDI/EQ0_EN
Input/Logic
Input
60
VEE_CP
Power
61
VCC_CP
Power
62
LF+
Passive
63
CP_CAP
Power
−
Center Pad
−
Description
In host mode (HIF set LOW):
Burst-mode clock input for SPI serial host interface.
In non-host mode (HIF set HIGH):
Trace equalization on/off pin for Serial Digital Differential Input 2.
Active-high input.
In host mode (HIF set LOW):
Serial digital data output for SPI serial host interface. Active-high output.
In non-host mode (HIF set HIGH):
Trace equalization on/off pin for Serial Digital Differential Input 1.
Active-high input.
In host mode (HIF set LOW):
Serial digital data input for SPI serial host interface. Active-high input.
In non-host mode (HIF set HIGH):
Trace equalization on/off pin for Serial Digital Differential Input 0.
Active-high input.
Most negative power supply connection for the internal
charge pump. Connect to GND.
Most positive power supply connection for the internal charge pump.
Connect to 3.3V or 2.5V
Loop Filter capacitor connection. (CLF = 47nF). Connect as shown in Typical
Application Circuit on page 41.
External capacitor for internal LDO regulator supplying the charge pump
circuit.
Ground pad on bottom of package. Connect to GND.
GS2985 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
36663 - 5
July 2012
9 of 45
Proprietary & Confidential