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參數(shù)資料
| 型號： | LT1996CDD |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision, 100uA Gain Selectable Amplifier |
| 中文描述： | OP-AMP, 250 uV OFFSET-MAX, 0.56 MHz BAND WIDTH, PDSO10 |
| 封裝： | 3 X 3 MM, PLASTIC, MO-229(WEED2), DFN-10 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 352K |
| 代理商： | LT1996CDD |
LT1996
10
1996f
Consider Figure 1. This shows the LT1996 configured as
a gain of 117 difference amplifier on a single supply with
Figure 3. Calculating Additional Voltage Range of
Inverting Inputs
These two voltages represent the high and low extremes
of the common mode input range, if the other limits have
not already been exceeded (1 and 3, above). In most cases,
the inverting inputs M9 through M81 can be taken further
than these two extremes because doing this does not
move the op amp input common mode. To calculate the
limit on this additional range, see Figure 3. Note that, with
Figure 1. Difference Amplifier Cannot Produce 0V on a Single
Supply. Provide a Negative Supply, or Raise Pin 5, or Provide
400
μ
V of V
DM
the output REF connected to ground. This is a great circuit,
but it does not support V
DM
= 0V at any common mode
because the output clips into ground while trying to
produce 0V
OUT
. It can be fixed simply by declaring the
valid input differential range not to extend below +0.4mV,
or by elevating the REF pin above 40mV, or by providing
a negative supply.
Calculating Input Voltage Range
Figure 2 shows the LT1996 in the generalized case of a
difference amplifier, with the inputs shorted for the com-
mon mode calculation. The values of R
F
and R
G
are
dictated by how the P inputs and REF pin are connected.
By superposition we can write:
V
INT
= V
EXT
(R
F
/(R
F
+ R
G
)) + V
REF
(R
G
/(R
F
+ R
G
))
Or, solving for V
EXT
:
V
EXT
= V
INT
(1 + R
G
/R
F
) – V
REF
R
G
/R
F
But valid V
INT
voltages are limited to V
CC
– 1.2V and V
EE
+
1V, so:
MAX V
EXT
= (V
CC
– 1.2) (1 + R
G
/R
F
) – V
REF
R
G
/R
F
and:
MIN V
EXT
= (V
EE
+ 1) (1 + R
G
/R
F
) – V
REF
R
G
/R
F
Figure 2. Calculating CM Input Voltage Range
V
MORE
= 0, the op amp output is at V
REF
. From the max
V
EXT
(the high cm limit), as V
MORE
goes positive, the op
amp output will go more negative from V
REF
by the amount
V
MORE
R
F
/R
G
, so:
V
OUT
= V
REF
– V
MORE
R
F
/R
G
Or:
V
MORE
= (V
REF
– V
OUT
) R
G
/R
F
The most negative that V
OUT
can go is V
EE
+ 0.04V, so:
Max V
MORE
= (V
REF
– V
EE
– 0.04V) R
G
/R
F
(should be positive)
The situation where this function is negative, and therefore
problematic, when V
REF
= 0 and V
EE
= 0, has already been
dealt with in Figure 1. The strength of the equation is
demonstrated in that it provides the three solutions
APPLICATIU
W
U
U
4pF
4pF
–
+
1996 F01
450k/81
450k/27
450k/9
450k/81
450k/27
450k/9
450k
450k
REF
5V
V
2.5V
V
DM
0V
+
–
8
7
6
5
4
9
10
1
2
3
LT1996
V
OUT
= 117 V
DM
–
+
V
REF
R
F
R
F
R
G
R
G
1996 F02
V
EXT
V
INT
V
CC
V
EE
–
+
V
REF
R
F
R
F
R
G
R
G
1996 F03
V
MAX OR MIN
V
INT
V
MORE
V
CC
V
EE
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| LT1996CDD#PBF | 功能描述:IC AMP PREC GAIN 10-DFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 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(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
| LT1996CDD#TRPBF | 功能描述:IC AMP PREC GAIN 10-DFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
| LT1996CMS | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Precision, 100uA Gain Selectable Amplifier |
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