1.2 GS2975A Pin Descriptions
Table 1-1: Pin Descriptions
Pin Number
Name
Type
Description
1, 3
2
DDI0, DDI0
DDI0_VTT
Input
Serial digital differential input 0.
Passive
Center tap of two 50Ω on-chip termination resistors between DDI0 and
DDI0.
4, 8, 12,16, 32,
43, 49
GND
Passive
Recommended connect to GND.
Serial digital differential input 1.
5, 7
6
DDI1,DDI1
DDI1_VTT
Input
Passive
Center tap of two 50Ω on-chip termination resistors between DDI1 and
DDI1.
9, 11
10
DDI2, DDI2
DDI2_VTT
Input
Serial digital differential input 2.
Passive
Center tap of two 50Ω on-chip termination resistors between DDI2 and
DDI2.
13, 15
14
DDI3, DDI3
DDI3_VTT
Input
Serial digital differential input 3.
Passive
Center tap of two 50Ω on-chip termination resistors between DDI3 and
DDI3.
17, 18
DDI_SEL[1:0]
Logic Input
Serial digital input select.
DDI_SEL1
DDI_SEL0
INPUT SELECTED
DDI0
0
0
1
1
0
1
0
1
DDI1
DDI2
DDI3
19
20
21
BYPASS
Logic Input
Logic Input
Logic Input
Bypass the reclocker stage.
When BYPASS is HIGH, it overwrites the AUTOBYPASS setting.
AUTOBYPASS
AUTO/MAN
Automatically bypasses the reclocker stage when the PLL is not locked
This pin is ignored when BYPASS is HIGH.
Auto/Manual select.
When set HIGH, the standard is automatically detected from the input data
rate. When set LOW, the user must program the input standard using the
SS[2:0] pins.
22
23
VCC_VCO
VEE_VCO
Power
Power
Most positive power supply connection for the internal VCO section.
Connect to 3.3V.
Most negative power supply connection for the internal VCO section.
Connect to GND.
GS2975A HD-LINX® III Multi-Rate SDI Automatic
Reclocker with Dual Differential Outputs
Data Sheet
5 of 27
41487 - 4
April 2009
GENNUM [ GENNUM CORPORATION ]
