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參數(shù)資料
| 型號： | LT1114AMJ |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Dual/Quad Low Power Precision, Picoamp Input Op Amps |
| 中文描述： | QUAD OP-AMP, 120 uV OFFSET-MAX, 0.75 MHz BAND WIDTH, CDIP14 |
| 封裝： | 0.300 INCH, CERDIP-14 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 369K |
| 代理商： | LT1114AMJ |
10
LT1112/LT1114
U
S
A
O
PPLICATI
IU
U
800mV of the supplies. The effect of input and output
overdrive on the other amplifiers in the LT1112 or
LT1114 packages is negligible, as each amplifier is
biased independently.
Advantages of Matched Dual and Quad Op Amps
In many applications the performance of a system de-
pends on the matching between two operational amplifi-
ers rather than the individual characteristics of the two op
amps. Two or three op amp instrumentation amplifiers,
tracking voltage references and low drift active filters are
some of the circuits requiring matching between two op
amps.
The well-known triple op amp configuration illustrates
these concepts. Output offset is a function of the differ-
ence between the offsets of the two halves of the LT1112.
This error cancellation principle holds for a considerable
number of input referred parameters in addition to offset
voltage and its drift with temperature. Input bias current
will be the average of the two noninverting input currents
(I
B+
). The difference between these two currents (
I
B+
) is
the offset current of the instrumentation amplifier. Com-
mon-mode and power supply rejections will be dependent
only on the match between the two amplifiers (assuming
perfect resistor matching).
The concepts of common-mode and power supply rejec-
tion ratio match (
CMRR and
PSRR) are best demon-
strated with a numerical example:
Assume CMRR
A
= +1
μ
V/V or 120dB,
and CMRR
B
= +0.75
μ
V/V or 122.5dB,
then
CMRR = 0.25
μ
V/V or 132dB;
if CMRR
B
= –0.75
μ
V/V which is still 122.5dB,
then
CMRR = 1.75
μ
V/V or 115dB.
Clearly the LT1112/LT1114, by specifying and guarantee-
ing all of these matching parameters, can significantly
improve the performance of matching-dependent
circuits.
Typical performance of the instrumentation amplifier:
Input offset voltage = 35
μ
V
Offset voltage drift = 0.3
μ
V/
°
C
Input bias current = 80pA
Input offset current = 100pA
Input resistance = 800G
Input noise = 0.42
μ
V
P-P
Three Op Amp Instrumentation Amplifier
When the instrumentation amplifier is used with high
impedance sources, the LT1114 is recommended be-
cause its CMRR vs frequency performance is better than
the LT1112’s. For example, with two matched 1M
source
resistors, CMRR at 100Hz is 100dB with the LT1114, 76dB
with the LT1112.
This difference is explained by the fact that capacitance
between adjacent pins on an IC package is about 0.25pF
(including package, socket and PC board trace capaci-
tances).
On the dual op amp package, positive input A is next to the
V
–
pin (AC ground), while positive input B has no AC
ground pin adjacent to it, resulting in a 0.25pF input
capacitance mismatch. At 100Hz, 0.25pF represents a
6.4
×
10
9
input impedance mismatch, which is only 76dB
higher than the 1M
source resistors.
On the quad package, all four inputs are adjacent to a
power supply terminal–therefore, there is no mismatch.
1/2 LT1112
OR
1/4 LT1114
D
+
1/2 LT1112
OR
1/4 LT1114
A
IN
–
IN
+
R1
10k
1%
R3
2.1k
1%
R8
200
R2
10k
1%
R4
100
0.5%
R5
100
0.5%
C1
33pF
R10
1M
R6
10k
0.5%
R7
9.88k
0.5%
R9
200
OUTPUT
LT1097 OR
1/4LT1114
B OR C
+
GAIN = 1000
TRIM R8 FOR GAIN
TRIM R9 FOR DC
COMMON-MODE REJECTION
TRIM R10 FOR AC
COMMON-MODE REJECTION
LT1112/14 AI02
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1114C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual/Quad Low Power Precision, Picoamp Input Op Amps |
| LT1114CJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| LT1114CN | 功能描述:IC PREC OP-AMP LOWPWR QUAD 14DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1114CN#PBF | 功能描述:IC PREC OP-AMP LOWPWR QUAD 14DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| LT1114CNPBF | 制造商:Linear Technology 功能描述:Quad precision op amp,LT1114CN8 DIP14 |
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