GS2975A Datasheet, PDF (5/27 Pages) Gennum Corporation – HD-LINX® III Multi-Rate SDI Automatic Reclocker with Dual Differential Outputs

1.2 GS2975A Pin Descriptions
Table 1-1: Pin Descriptions
Pin Number Name
1, 3
DDI0, DDI0
2
DDI0_VTT
4, 8, 12,16, 32,
43, 49
5, 7
6
GND
DDI1,DDI1
DDI1_VTT
9, 11
10
DDI2, DDI2
DDI2_VTT
13, 15
14
DDI3, DDI3
DDI3_VTT
17, 18
DDI_SEL[1:0]
Type
Input
Passive
Passive
Description
Serial digital differential input 0.
Center tap of two 50Ω on-chip termination resistors between DDI0 and
DDI0.
Recommended connect to GND.
Input
Passive
Input
Passive
Input
Passive
Logic Input
Serial digital differential input 1.
Center tap of two 50Ω on-chip termination resistors between DDI1 and
DDI1.
Serial digital differential input 2.
Center tap of two 50Ω on-chip termination resistors between DDI2 and
DDI2.
Serial digital differential input 3.
Center tap of two 50Ω on-chip termination resistors between DDI3 and
DDI3.
Serial digital input select.
DDI_SEL1
0
0
1
1
DDI_SEL0
0
1
0
1
INPUT SELECTED
DDI0
DDI1
DDI2
DDI3
19
BYPASS
Logic Input
Bypass the reclocker stage.
When BYPASS is HIGH, it overwrites the AUTOBYPASS setting.
20
AUTOBYPASS
Logic Input
Automatically bypasses the reclocker stage when the PLL is not locked
This pin is ignored when BYPASS is HIGH.
21
AUTO/MAN
Logic Input
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
VCC_VCO
Power
Most positive power supply connection for the internal VCO section.
Connect to 3.3V.
23
VEE_VCO
Power
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
41487 - 4
April 2009
5 of 27