ISL59311IRZ Intersil, ISL59311IRZ Datasheet - Page 10

• Manufacturer Part Number: ISL59311IRZ
• Description: IC VIDEO AMP TRI DIFF 32-QFN
• Manufacturer: Intersil

Specifications of ISL59311IRZ

• Applications: Differential
• Output Type: Differential
• Number Of Circuits: 3
• -3db Bandwidth: 650MHz
• Slew Rate: 1500 V/µs
• Current - Supply: 7mA
• Current - Output / Channel: 60mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical Performance Curves
Operational Description and Application
Information
Introduction
The ISL59311 is designed to differentially drive composite
RGB video signals onto twisted pair lines, while
simultaneously encoding horizontal and vertical sync signals
as common mode output. The entire video signal plus sync
can therefore be transmitted on 3 twisted pairs of wire. When
utilizing CAT5 cable, the 4th available twisted pair can be
used for transmission of audio, data or control information.
The distribution of composite video over standard CAT5
cable enables enormous cost and labor savings compared
with traditional coaxial cable, when considering both the
relative low price and ease of pulling CAT5 cable.
The digital block of the chip is a data transceiver which is
intended to drive one twisted pair line. The maximum
baudrate for this block is 50Mbps.
Functional Description
The ISL59311 provides three fully differential high-speed
amplifiers, suitable for driving high-resolution composite
video signals onto twisted pair or standard coaxial cable.
The input common-mode range extends to the negative rail,
allowing simple ground-referenced input termination to be
used with a single supply. The amplifiers provide a fixed gain
of +2 to compensate for standard video cable termination
schemes. Horizontal and Vertical sync signals (H
V
encode the sync information as three discrete signals of
different voltage levels. Generally, in differential amplifiers an
external V
of the differential output; in the case of the ISL59311 the
V
receives a signal from the Logic Encoding Block with
encoded H
SYNC
REF
FIGURE 17. PACKAGE POWER DISSIPATION vs AMBIENT
of each of the three internal amplifier channels
) are passed to an internal Logic Encoding Block to
2.5
1.5
0.5
3
2
1
0
REF
0
SYNC
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD - QFN EXPOSED
DIEPAD SOLDERED TO PCB PER JESD51-5
2.857W
TEMPERATURE
pin is used to control the common mode level
25
AMBIENT TEMPERATURE (°C)
and V
50
SYNC
75
10
information. The final output
85
100
125
(Continued)
150
SYNC
and
ISL59311
consists of three fully differential video signals, with sync
encoded on the common mode of each of the three RGB
differential signals. H
separated from the differential output signals, decoded and
transmitted along with the RGB video signals to the video
monitor.
Sync Transmission
The ISL59311 encodes H
common mode output of the differential video signals; Red,
Green and Blue respectively. Data Sheet Table 1 shows the
common mode levels for the different SYNC input
combinations. Note that the sum of the common mode
voltages results in a fixed average DC level with no AC
content. This dramatically reduces EMI radiation into any
common mode signal along the twisted pairs of CAT5 cable.
Extract Common Mode Sync and Decode H
and V
H
Mode sync output voltages. The relationships between
H
Table 1. The common mode levels are easily separated from
the differential outputs of the ISL59311 using this simple
resistor network at the cable receiver input of each
differential channel; see Figure 20.
FIGURE 18. PACKAGE POWER DISSIPATION vs AMBIENT
SYNC
SYNC
HSYNC
High
High
Low
Low
SYNC
, V
and V
SYNC
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
VSYNC
TABLE 1. SYNC SIGNAL ENCODING
0
TEMPERATURE
High
High
Low
Low
SYNC
0
JEDEC JESD51-3 AND SEMI G42-88
(SINGLE LAYER) TEST BOARD
758mW
and the 3 common mode levels are given by
25
can be regenerated from the Common
AMBIENT TEMPERATURE (°C)
SYNC
COMMON
MODE A
(RED)
SYNC
3.0
2.5
2.0
2.5
50
and V
and V
75
SYNC
85
COMMON
(GREEN)
MODE B
100
SYNC
2.0
3.0
3.0
2.0
can easily be
125
signals on the
COMMON
150
MODE C
(BLUE)
April 25, 2007
SYNC
2.5
2.0
2.5
3.0
FN6372.3