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TVB1440 Datasheet(PDF) 16 Page - Texas Instruments

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No. de pieza TVB1440
Descripción Electrónicos  4-Channel Video Re-Driver with Equalization
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TVB1440 Datasheet(HTML) 16 Page - Texas Instruments

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Frequency (GHz)
0
1
2
3
4
5
6
7
8
9
10
-35
-30
-25
-20
-15
-10
-5
0
m1
m2
I2C_BUS1
I2C Switch
(TCA9546A)
TVB1440
I2C Address 0x58/59
SOC
TVB1440
I2C Address 0x5C/5D
TVB1440
I2C Address 0x58/59
TVB1440
I2C Address 0x5C/5D
TVB1440
I2C Address 0x58/59
TVB1440
I2C Address 0x5C/5D
I2C_BUS2
I2C_BUS3
SCL
SDA
TCA9546A I2C address options:
7'b1110XYZ where X = A2, Y= A1, Z = A0
TVB1440
I2C Address 0x58/59
TVB1440
I2C Address 0x5C/5D
I2C_BUS4
ECCN: 3E991
TVB1440
SLASE51A – NOVEMBER 2014 – REVISED NOVEMBER 2014
www.ti.com
9.1.1.2.4
TVB1440 Configuration
The TVB1440 must be configured by the SOC using I2C. Because of the limited number of I2C address available
on the TVB1440, an I2C switch needs to be incorporated in order to configure each of the TVB1440. Figure 11
shows an example implement using the Texas Instruments TCA9546A 4-channel I2C switch.
Figure 11. Example I2C Switch Implementation
9.1.1.2.5
Receiver Equalization Setting
The TVB1440 has a receiver equalizer that is adjustable from 0dB to 15 dB at 5 Gbps. The common approach to
determine the proper equalizer setting is to measure the insertion loss of the channel at the input of the TVB1440
at the Nyquist frequency of the data rate (1.875 GHz for 3.75 Gbps and 2.5 GHz for 5 Gbps). For example, if the
input channel is 20 inches of trace with 4 mil width over FR4, the insertion loss at 3.75 Gbps would be -7.3 dB
and at 5 Gbps would be -9.1 dB. The register EQ_LEVEL_LANEx, where X = 0, 1, 2, or 3 should be
programmed to 3’b100 for a 3.75 Gbps data rate and should be programmed to 3’b101. The actual setting may
need to be adjusted based on the additional channel parasitics from package, vias, and connectors.
m1 frequency = 1.876 GHz
IL = –7.346
m2 frequency = 2.500 GHz
IL = –9.185
Figure 12. Insertion Loss of 20 Inch FR4 Trace With 4-mil Width
16
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Product Folder Links: TVB1440


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