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參數(shù)資料
| 型號： | LT1189CS8#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP VID DIFF CURR FDBK 8SOIC |
| 標準包裝： | 2,500 |
| 應(yīng)用： | 差分 |
| 電路數(shù)： | 1 |
| -3db帶寬： | 35MHz |
| 轉(zhuǎn)換速率： | 220 V/µs |
| 電流 - 電源： | 13mA |
| 電流 - 輸出 / 通道： | 20mA |
| 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： | 帶卷 (TR) |
9
LT1189
Instrumentation Amplifier Rejects High Voltage
Instrumentation amplifiers are often used to process
slowly varying outputs from transducers. With the LT1189
it is easy to make an instrumentation amplifier that can
respond to rapidly varying signals. Attenuation resistors
in front of the LT1189 allow very large common-mode
signals to be rejected while maintaining good frequency
response. The input common-mode and differential-mode
signals are reduced by 100:1, while the closed-loop gain
is set to be 100, thereby maintaining unity-gain input to
output. The unique topology allows for frequency re-
sponse boost by adding 150pF to pin 8 as shown.
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
3.5MHz Instrumentation Amplifier Rejects 120VP-P
LT1189 AI03
–
+
100*
VCM
120VP-P
VIN
10k*
100
150pF
REF
FB
4
7
5V
–5V
LT1189
6
2
1
3
8
* 0.1% RESISTORS
WORST CASE CMRR = 48dB
10k
Output of Instrumentation Amplifier with 1MHz Square Wave
Riding on 120VP-P at the Input
LT1189 AI04
High Voltage Instrumentation Amplifier Response
Operating with Low Closed-Loop Gain
The LT1189 has been optimized for closed-loop gains of
10 or greater. The amplifier can be operated at much lower
closed-loop gains with the aid of a capacitor CFB across
the feedback resistor, (feedback zero). This capacitor
lowers the closed-loop 3dB bandwidth. The bandwidth
cannot be made arbitrarily low because CFB is a short at
high frequency and the amplifier will appear configured
unity-gain. As an approximate guideline, make BW
× AVCL
= 200MHz. This expression expands to:
A
RC
MHz
VCL
FB
2
200
π
()( )
=
or:
C
A
MHz
R
FB
VCL
FB
= ()( )( )
200
2
π
The effect of the feedback zero on the transient and
frequency response is shown for AV = 4.
FREQUENCY (Hz)
VOLTAGE
GAIN
(dB)
20
LT1189 AI05
100M
10M
1M
100k
0
–20
–60
–40
COMMON-MODE RESPONSE
DIFFERENTIAL-MODE RESPONSE
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