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參數(shù)資料
| 型號(hào)： | LT1399IS#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CURRNT FEEDBK AMP TRPL 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 3 |
| 轉(zhuǎn)換速率： | 800 V/µs |
| -3db帶寬： | 300MHz |
| 電流 - 輸入偏壓： | 10µA |
| 電壓 - 輸入偏移： | 1500µV |
| 電流 - 電源： | 4.6mA |
| 電流 - 輸出 / 通道： | 80mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 12 V，±2 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SO |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | LT1399ISTR |
11
LT1398/LT1399/LT1399HV
sn13989 13989fas
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
The enable/disable times are very fast when driven from
standard 5V CMOS logic. Each amplifier enables in about
30ns (50% point to 50% point) while operating on
±5V
supplies (Figure 2). Likewise, the disable time is approxi-
mately 40ns (50% point to 50% point) (Figure 3).
Differential Input Signal Swing
To avoid any breakdown condition on the input transis-
tors, the differential input swing must be limited to
±5V. In
normal operation, the differential voltage between the
input pins is small, so the
±5V limit is not an issue. In the
disabled mode however, the differential swing can be the
same as the input swing, and there is a risk of device
breakdown if input voltage range has not been properly
considered.
3-Input Video MUX Cable Driver
The application on the first page of this data sheet shows
a low cost, 3-input video MUX cable driver. The scope
photo below (Figure 4) displays the cable output of a
30MHz square wave driving 150
. In this circuit the
active amplifier is loaded by the sum of RF and RG of each
disabled amplifier. Resistor values have been chosen to
keep the total back termination at 75
while maintaining
a gain of 1 at the 75
load. The switching time between
any two channels is approximately 32ns when both
enable pins are driven.
When building the board, care was taken to minimize
trace lengths at the inverting input. The ground plane was
also pulled away from RF and RG on both sides of the
board to minimize stray capacitance.
Figure 5. 3-Input Video MUX Switching Response (AV = 2)
VS = ±5V
20ns/DIV
VINA = VINB = 2VP-P
at 3.58MHz
1398/99 F05
EN A
EN B
OUTPUT
Using the LT1399 to Drive LCD Displays
Driving the current crop of XGA and UXGA LCD displays
can be a difficult problem because they require drive
voltages of up to 12V, are usually a capacitive load of over
300pF, and require fast settling. The LT1399HV is par-
ticularly well suited for driving these LCD displays be-
cause it is capable of swinging more than
±6V on ±7.5V
supplies, and it can drive large capacitive loads with a
small series resistor at the output, minimizing settling
time. As seen in Figures 6 and 7, at a gain of +3 with a
16.9
output series resistor and a 330pF load, the
LT1399HV is capable of settling to 0.1% in 30ns for a 6V
step. Similarly, a 12V output step settles in 70ns.
Figure 6. LT1399/LT1399HV Large-Signal Pulse Response
VIN
VOUT
VS = ±5V
20ns/DIV
RF = 324
RG = 162
RS = 16.9
CL = 330pF
1398/99 AI06
Figure 4. Square Wave Response
OUTPUT
200mV/DIV
5ns/DIV
1398/99 F04
RL = 150
RF = RG = 324
f = 10MHz
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