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LT1187IN8 Datasheet(PDF) 10 Page - Linear Technology |
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LT1187IN8 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  LT1187 10 1187fa LT1187 in Unity Gain (A) STANDARD INPUTS, PINS 2 TO 3, VIN = 1.0VP-P (B) EXTENDED INPUTS, PINS 2 TO 2, VIN = 1.0VP-P (C) EXTENDED INPUTS, PINS 1 TO 2, VIN = 2.0VP-P LT1187 • AI06 APPLICATIONS INFORMATION Using the Shutdown Feature The LT1187 has a unique feature that allows the amplifier to be shutdown for conserving power, or for multiplexing several amplifiers onto a common cable. The amplifier will shut down by taking Pin 5 to V–. In shutdown, the amplifier dissipates 15mW while maintaining a true high impedance output state of 20k in parallel with the feedback resistors. For MUX applications, the amplifiers may be configured inverting, noninverting or differential. When the output is loaded with as little 1k from the amplifier’s feedback resistors, the amplifier shuts off in 600ns. This shutoff can be under the control of HC CMOS operating between 0V and –5V. The ability to maintain shutoff is shown on the curve Shutdown Supply Current vs Temperature in the Typical Performance Characteristics section. At very high elevated temperature it is important to hold the shutdown pin close to the negative supply to keep the supply current from increasing. Send Color Video Over Twisted-Pair With an LT1187 it is possible to send and receive color composite video signals more than 1000 feet on a low cost twisted-pair. A bi-directional “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 dif- ferential signals to drive the line which is back-terminated 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 50 Ω to boost the 3dB bandwidth of the system from 750kHz to 4MHz. This bandwidth is adequate to pass a 3.58MHz chroma subcarrier and the 4.5MHz sound sub- carrier. Attenuation in the cable can be compensated by lowering the gain set resistor RG. At Transmit 2, another pair of LT1195s serve the dual function to provide cable termination via low output impedance, and generate dif- ferential signals for Transmit 2. Cable termination is made up of a 15 Ω and 33Ω attenuator to reduce the differential input signal to the LT1187. Maximum input signal for the LT1187 is 760mVP-P. 1MHz Sine Wave Gated Off with Shutdown Pin AV = 2, RFB = RG = 1k LT1187 • AI07 1.5MHz Square Wave Input and Unequalized Response Through 1000 Feet of Twisted-Pair LT1187 • AI08 |
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