LT1195CS8 Linear Technology, LT1195CS8 Datasheet - Page 10

• Manufacturer Part Number: LT1195CS8
• Description: IC OP-AMP LOW-PWR HI-SPEED 8SOIC
• Manufacturer: Linear Technology

Specifications of LT1195CS8

• Applications: General Purpose
• Number Of Circuits: 1
• Slew Rate: 165 V/µs
• Current - Supply: 12mA
• Current - Output / Channel: 20mA
• Voltage - Supply, Single/dual (±): 4.75 V ~ 16 V, ±2.38 V ~ 8 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
LT1195
Send Color Video Over Twisted-Pair
With an LT1195 it is possible to send and receive color
composite video signals more than 1000 feet on a low cost
twisted-pair. A bidirectional “video bus” consists of the
LT1195 op amp and the LT1187 video difference amplifier.
A pair of LT1195s at TRANSMIT 1, is used to generate
differential signals to drive the line which is back-termi-
nated in its characteristic impedance. The LT1187
twisted-pair receiver, converts signals from differential to
single-ended. Topology of the LT1187 provides for cable
compensation at the amplifier’s feedback node as shown.
In this case, 1000 feet of twisted-pair is compensated with
1000pF and 50Ω to boost the 3dB bandwidth of the
system from 750kHz to 4MHz. This bandwidth is adequate
to pass a 3.58MHz chrome subcarrier and the 4.5MHz
sound subcarrier. Attenuation in the cable can be compen-
sated by lowering the gain set resistor R
2, another pair of LT1195s serve the dual function to
provide cable termination via low output impedance and
generate differential signals for TRANSMIT 2. Cable termi-
nation is made up of 15Ω and 33Ω attentuators to reduce
the differential input signal to the LT1187. Maximum input
signal for the LT1187 is 760mV
10
Response Through 1000 Feet of Twisted-Pair
1.5MHz Square Wave Input and Unequalized
U
U
P-P
.
W
G
. At TRANSMIT
1195 A108
U
Response Through 1000 Feet of Twisted-Pair
Vector Plot of Standard Color Burst Through
1.5MHz Square Wave Input and Equalized
Multiburst Pattern Passed Through
1000 Feet of Twisted-Pair
1000 Feet of Twisted-Pair
1195 A111
1195 A110
1195 A109
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