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參數(shù)資料
| 型號： | LT1227CS8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEO CURRNT FEEDBK AMP 8SOIC |
| 標準包裝： | 100 |
| 應用： | 電流反饋 |
| 電路數(shù)： | 1 |
| -3db帶寬： | 140MHz |
| 轉(zhuǎn)換速率： | 1100 V/µs |
| 電流 - 電源： | 10mA |
| 電流 - 輸出 / 通道： | 60mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 30 V，±2 V ~ 15 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1318 (CN2011-ZH PDF) |
10
LT1227
U
S
A
O
PPLICATI
TYPICAL
MUX Amplifier
The shutdown function can be effectively used to con-
struct a MUX amplifier. A two-channel version is shown,
but more inputs could be added with suitable logic. By
configuring each amplifier as a unity-gain follower, there
is no loading by the feedback network when the amplifier
is off. The open drains of the 74C906 buffers are used to
interface the 5V logic to the shutdown pin. Feedthrough
from the unselected input to the output is –70dB at
10MHz. The differential voltage between MUX inputs VIN1
and VIN2 appears across the inputs of the shutdown
device, this voltage should be less than
±5V to avoid
turning on the clamp diodes discussed previously. If the
inputs are sinusoidal having a zero DC level, this implies
that the amplitude of each input should be less than
5VP-P. The output impedance of the off amplifier remains
high until the output level exceeds approximately 6VP-P at
10MHz, this sets the maximum usable output level. Switch-
ing time between inputs is about 4
s without an external
pullup. Adding a 10k pullup resistor from each shutdown
pin to V+ will reduce the switching time to 2
s but will
increase the positive supply current in shutdown by 1.5mA.
MUX Amplifier
INPUT
SELECT
VOUT
MUX Input Crosstalk vs Frequency
FREQUENCY (MHz)
1
–90
INPUT
CROSSTALK
(dB)
–80
–70
–60
–50
–40
10
100
LT1227 TA05
5V
74HC04
5V
74C906
–
+
LT1227
1227 TA04
INPUT
SELECT
VOUT
S/D
–
+
LT1227
15V
–15V
1.5k
5V
74C906
VIN1
15V
–15V
VIN2
1.5k
S/D
VOUT
VIN
= 1
MUX Output
TA03
VIN1 = 1VP-P, VIN2 = 0V
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