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參數(shù)資料
| 型號： | LT1398 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Cost Dual 300MHz Current Feedback Amplifiers with Shutdown(低價雙路300MHz電流反饋放大器（帶關端引腳）) |
| 中文描述： | 低成本雙300MHz的電流反饋放大器，帶有關斷（低價雙路300MHz的電流反饋放大器（帶關端引腳）） |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 234K |
| 代理商： | LT1398 |
10
LT1398/LT1399/LT1399HV
U
S
A
O
PPLICATI
U
U
Power Supplies
The LT1398/LT1399 will operate from single or split
supplies from
±
2V (4V total) to
±
6V (12V total). The
LT1399HV will operate from single or split supplies from
±
2V (4V total) to
±
7.5V (15V total). It is not necessary to
use equal value split supplies, however the offset voltage
and inverting input bias current will change. The offset
voltage changes about 600
μ
V per volt of supply mis-
match. The inverting bias current will typically change
about 2
μ
A per volt of supply mismatch.
Slew Rate
Unlike a traditional voltage feedback op amp, the slew rate
of a current feedback amplifier is not independent of the
amplifier gain configuration. In a current feedback ampli-
fier, both the input stage and the output stage have slew rate
limitations. In the inverting mode, and for gains of 2 or more
in the noninverting mode, the signal amplitude between the
input pins is small and the overall slew rate is that of the
output stage. For gains less than 2 in the noninverting mode,
the overall slew rate is limited by the input stage.
The input slew rate of the LT1398/LT1399/LT1399HV is
approximately 600V/
μ
s and is set by internal currents and
capacitances. The output slew rate is set by the value of the
feedback resistor and internal capacitance. At a gain of 2
with 324
feedback and gain resistors and
±
5V supplies,
the output slew rate is typically 800V/
μ
s. Larger feedback
resistors will reduce the slew rate as will lower supply
voltages.
Enable/Disable
Each amplifier of the LT1398/LT1399/LT1399HV has a
unique high impedance, zero supply current mode which
is controlled by its own EN pin. These amplifiers are
designed to operate with CMOS logic; the amplifiers draw
zero current when these pins are high. To activate each
amplifier, its EN pin is normally pulled to a logic low.
However, supply current will vary as the voltage between
the V
+
supply and EN is varied. As seen in Figure 1, +I
S
does vary with (V
+
– V
EN
), particularly when the voltage
difference is less than 3V. For normal operation, it is
important to keep the EN pin at least 3V below the V
+
supply. If a V
+
of less than 3V is desired, and the amplifier
will remain enabled at all times, then the EN pin should be
tied to the V
–
supply. The enable pin current is approxi-
mately 30
μ
A when activated. If using CMOS open-drain
logic, an external 1k pull-up resistor is recommended to
ensure that the LT1399 remains disabled in spite of any
CMOS drain-leakage currents.
Figure 1. +I
S
vs (V
+
– V
EN
)
V
+
– V
EN
(V)
0
0
+
S
0.5
1.5
2.0
2.5
5.0
3.5
2
4
5
1398/99 F01
1.0
4.0
4.5
3.0
1
3
6
7
T
A
= 25
°
C
V
+
= 5V
V
–
= –5V
V
–
= 0V
Figure 2. Amplifier Enable Time, A
V
= 2
V
S
=
±
5V
V
IN
= 1V
R
F
= 324
R
G
= 324
R
L
= 100
1398/99 F02
OUTPUT
EN
Figure 3. Amplifier Disable Time, A
V
= 2
V
S
=
±
5V
V
IN
= 1V
R
F
= 324
R
G
= 324
R
L
= 100
1398/99 F03
OUTPUT
EN
相關PDF資料 |
PDF描述 |
|---|---|
| LT1399 | Low Cost Triple 300MHz Current Feedback Amplifiers with Shutdown(低價三路300MHz電流反饋放大器（帶關端引腳）) |
| LT1424IN8-5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1424CN8-5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1424CN8-9 | Isolated Flyback Switching Regulator with 9V Output |
| LT1424IS8-5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1398CS | 功能描述:IC CURRNT FEEDBK AMP DUAL 16SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| LT1398CS#PBF | 功能描述:IC CURRNT FEEDBK AMP DUAL 16SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| LT1398CS#TR | 功能描述:IC AMP CURR FEEDBACK DUAL 16SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| LT1398CS#TRPBF | 功能描述:IC CURRNT FEEDBK AMP DUAL 16SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| LT1399 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback |
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