參數(shù)資料
型號: LT1723IMS8
廠商: LINEAR TECHNOLOGY CORP
元件分類: 運(yùn)動(dòng)控制電子
英文描述: Single, Dual, Quad 200MHz Low Noise Precision Op Amps
中文描述: DUAL OP-AMP, 1100 uV OFFSET-MAX, 200 MHz BAND WIDTH, PDSO8
封裝: PLASTIC, MSOP-8
文件頁數(shù): 13/16頁
文件大小: 326K
代理商: LT1723IMS8
LT1722/LT1723/LT1724
13
172234fa
Power dissipation is composed of two parts. The first is
due to the quiescent supply current and the second is due
to on-chip dissipation caused by the load current.
Worst-case instantaneous power dissipation for a given
resistive load in one amplifier occurs at the maximum
supply current and when the output voltage is at half of
either supply voltage (or the maximum swing if less than
half supply voltage).
Therefore P
D(MAX)
in one amplifier is:
P
D(MAX)
= (V
+
– V
)(I
S(MAX)
) + (V
+
/2)
2
/R
L
or
P
D(MAX)
= (V
+
– V
)(I
S(MAX)
) +
(V
+
– V
O(MAX)
)(V
O(MAX)
/R
L
)
Example. Worst-case conditions are: both op amps in the
LT1723IS8 are at T
A
= 85
°
C, V
S
=
±
5V, R
L
= 150
,
V
OUT
= 2.5V.
P
D(MAX)
= 2 [(10V)(5.95mA) + (2.5V)
2
/150
] = 203mW
T
J(MAX)
= 85
°
C + (203mW)(190
°
C/W) = 124
°
C
which is less than the absolute maximum rating at 150
°
C.
APPLICATIU
W
U
U
Circuit Operation
The
LT1722/LT1723/LT1724
circuit topology is a voltage
feedback amplifier. The operation of the circuit can be
understood by referring to the Simplified Schematic. The
first stage is a folded cascode formed by the transistors
Q1 through Q4. A degeneration resistor, R, is used in the
input stage. The current mirror Q5, Q6 is bootstrapped by
Q7. The capacitor, C, assures the bandwidth and the slew
rate performance. The output stage is formed by comple-
mentary emitter followers, Q8 through Q11. The diodes
D1 and D2 protect against input reversed biasing. The
remaining part of the circuit assures optimum voltage and
current biases for all stages.
Low noise, reduced current supply, high speed and DC
accurate parameters are distinctive features of the
LT1722/
LT1723/LT1724
.
SIW
W
Q2
+IN
Q1
D1
D2
R
–IN
R2
Q6
Q7
Q9
Q10
V
S+
V
S–
OUT
1723 SS
Q11
Q8
Q4
C
V
BIAS
I
3
I
4
I
5
I
2
I
1
R1
Q5
Q3
相關(guān)PDF資料
PDF描述
LT1723IS8 Single, Dual, Quad 200MHz Low Noise Precision Op Amps
LT1724CS Single, Dual, Quad 200MHz Low Noise Precision Op Amps
LT1724IS Single, Dual, Quad 200MHz Low Noise Precision Op Amps
LT1722CS5 Single, Dual, Quad 200MHz Low Noise Precision Op Amps
LT1722CS8 Single, Dual, Quad 200MHz Low Noise Precision Op Amps
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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