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參數(shù)資料
| 型號： | LT1002 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 444322401 |
| 中文描述： | 雙路，精密運算放大器匹配 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 344K |
| 代理商： | LT1002 |
10
LT1002
APPLICATIO
S I
FOR
ATIO
U
Advantages of Matched Dual Op Amps
In many applica-
tions the performance of a system depends on the match-
ing between two operational amplifiers rather than the
individual characteristics of the two op amps. Two or three
op amp instrumentation amplifiers, tracking voltage refer-
ences and low drift active filters are some of the circuits
requiring matching between two op amps.
W
U
U
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 LT1002.
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 non-inverting input currents
(I
B+
). The difference between these two currents (I
OS+
) is
the offset current of the instrumentation amplifier. The
difference between the inverting input currents (I
OS–
) will
cause errors flowing through R1, R2, and R3. Common-
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
= +1.0
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 LT1002, by specifying and guaranteeing all of
these matching parameters, can significantly improve the
performance of matching dependent circuits.
1002 TA07
R1
10k
1%
R4
100
1%
R6
10k
1%
R5
100
1%
INPUT
OUTPUT
–
+
Gain = 1000
–
+
A
1
/
2
LT1002
–
+
B
1
/
2
LT1002
LT1037
–
INPUT
+
R2
10k
1%
R7
R9
9.76k
1%
R3
R8
2.1k
1%
C1
100pF
R10
100k
200
200
Three Op Amp Instrumentation Amplifier
Trim R8 for gain
Trim R9 for DC common mode rejection
Trim R10 for AC common mode rejection
Typical performance of the instrumentation amplifier:
Input offset voltage = 25
μ
V
Input bias current = 0.7nA
Input resistance = 200 G
Input offset current = 0.6nA
Input noise = 0.5
μ
V p-p
Power bandwidth (V
0
=
±
10V) = 80kHz
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1002A | Dual, Matched Precision Operational Amplifier |
| LT1002AC | Dual, Matched Precision Operational Amplifier |
| LT1002ACJ | Dual, Matched Precision Operational Amplifier |
| LT1002ACN | Dual, Matched Precision Operational Amplifier |
| LT1002AM | Dual, Matched Precision Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1002A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual, Matched Precision Operational Amplifier |
| LT1002AC | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual, Matched Precision Operational Amplifier |
| LT1002ACJ | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual, Matched Precision Operational Amplifier |
| LT1002ACN | 功能描述:IC PREC OPAMP DUAL MATCHED 14DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設(shè)備封裝:8-TSSOP 包裝:管件 |
| LT1002ACN#PBF | 功能描述:IC PREC OPAMP DUAL MATCHED 14DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設(shè)備封裝:8-TSSOP 包裝:管件 |
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