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參數(shù)資料
| 型號： | LT1192CS8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OP-AMP VIDEO HISPD SNGL 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 應(yīng)用： | 通用 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 450 V/µs |
| 電流 - 電源： | 32mA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | 4.75 V ~ 16 V，±2.38 V ~ 8 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 管件 |
8
LT1192
FREQUENCY (Hz)
CLOSED
LOOP
VOLTAGE
GAIN
(dB)
24
LT1192 TA07
100M
10M
1M
100k
TA = 25°C
A = +10
V
R
= 910
R = 47
20
16
12
8
4
0
AV = +5
RFB = 910
RG = 100
FB
G
CABLE
2
+
–
5V
7
LT1192
–5V
4
3
6
R
75
75
G
RFB
Cable Driver Voltage Gain vs Frequency
Double Terminated Cable Driver
APPLICATIO S I FOR ATIO
WU
UU
LT1192 TA05
SETTLING TIME TO 1mV, AV = –1
SUPPLY BYPASS CAPACITORS = 0.1
F
VOUT
1V/DIV
VOUT
1mV/DIV
0V
LT1192 TA06
SETTLING TIME TO 1mV, AV = –1
SUPPLY BYPASS CAPACITORS = 0.1
F + 4.7F TANTALUM
VOUT
1V/DIV
VOUT
1mV/DIV
0V
Settling Time Poor Bypass
Settling Time Good Bypass
amplified to 1mV/DIV the settling time to 1mV is 4.132
s
for the 0.1
Fbypass;thetimedropsto140nswithmultiple
bypass capacitors.
Cable Terminations
The LT1192 operational amplifier has been optimized as a
low cost video cable driver. The
±50mAguaranteedoutput
current enables the LT1192 to easily deliver 7.5VP-P into
100
, while operating on ±5V supplies or 2.6VP-P on a
single 5V supply.
When driving a cable it is important to terminate the cable
to avoid unwanted reflections. This can be done in one of
two ways: single termination or double termination. With
single termination, the cable must be terminated at the
receiving end (75
to ground) to absorb unwanted
energy. The best performance can be obtained by double
termination (75
in series with the output of the ampli-
fier, and 75
to ground at the other end of the cable). This
termination is preferred because reflected energy is
absorbed at each end of the cable. When using the double
termination technique it is important to note that the
signal is attenuated by a factor of 2, or 6dB. For a cable
driver with a gain of 5 (op amp gain of 10) the – 3dB
bandwidth is 56MHz with only 0.25dB of peaking.
Using the Shutdown Feature
The LT1192 has a unique feature that allows the amplifier
to be shut down 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 15k
in parallel with the feedback resis-
tors. The amplifiers must be used in a noninverting con-
figuration for MUX applications. In inverting configura-
tions the input signal is fed to the output through the
feedback components. When the output is loaded with as
little as 1k
from the amplifier’s feedback resistors, the
amplifier shuts off in 400ns. This shutoff can be under the
control of HC CMOS operating between 0V and – 5V.
0V
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