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參數(shù)資料
| 型號： | LT1101SW#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PREC INSTRMNT-AMP SNGL 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 47 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 0.1 V/µs |
| 增益帶寬積： | 37kHz |
| 電流 - 輸入偏壓： | 6nA |
| 電壓 - 輸入偏移： | 250µV |
| 電流 - 電源： | 94µA |
| 電壓 - 電源，單路/雙路(±)： | 2.2 V ~ 36 V，±1.1 V ~ 18 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SO |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1323 (CN2011-ZH PDF) |
12
LT1101
1101fa
A simple resistive offset adjust procedure is shown below.
If R = 5 for G = 10, and R = 50 for G = 100, then the
effect of R on gain error is approximately 0.006%.
Unfortunately, about 450A has to flow through R to bias
the reference terminal (Pin 1) and to null out the worst-
case offset voltage. The total current through the resistor
network can exceed 1mA, and the micropower advantage
of the LT1101 is lost.
APPLICATIO S I FOR ATIO
WU
UU
Another offset adjust scheme uses the LT1077 micropower
op amp to drive the reference Pin 1. Gain error and
common mode rejection are unaffected, the total current
increase is 45A. The offset of the LT1077 is trimmed and
amplified to match and cancel the offset voltage of the
LT1101. Output offset null range is ±25mV.
LT1101 AI01
15V
10k
20k
OUT
LT1101
10k
– 15V
3
6
5
8
1
R
4
+
–
+
–
LT1101 AI02
OUT
LT1101
1.2V TO 18V
–1.2V TO –18V
100k
3.3k
5k POT
3
6
7
8
1
4
2
5
1
–
+
LT1077
Gains Between 10 and 100
Gains between 10 and 100 can be achieved by connecting
two equal resistors (= Rx) between Pins 1 and 2 and
Pins 7 and 8.
The nominal value of R is 9.2k. The usefulness of this
method is limited by the fact that R is not controlled to
better than ±10% absolute accuracy in production.
However, on any specific unit, 90R can be measured
between Pins 1 and 2.
Input Protection
Instrumentation amplifiers are often used in harsh
environments where overload conditions can occur. The
LT1101 employs PNP input transistors, consequently the
differential input voltage can be ±30V (with ±15V
supplies, ±36V with ±18V supplies) without an increase in
input bias current. Competitive instrumentation amplifiers
have NPN inputs which are protected by back-to-back
diodes. When the differential input voltage exceeds ±1.3V
on these competitive devices, input current increases to
the milliampere level; more than ±10V differential voltage
can cause permanent damage.
When the LT1101’s inputs are pulled above the positive
supply, the inputs will clamp a diode voltage above the
positive supply. No damage will occur if the input current
is limited to 20mA.
500 resistors in series with the inputs protect the LT1101
when the inputs are pulled as much as 10V below the
negative supply.
Gain = 10 +
Rx
R+ Rx/90
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