参数资料
型号: LT1800CS8
厂商: LINEAR TECHNOLOGY CORP
元件分类: 运动控制电子
英文描述: 80MHz, 25V/ms Low Power Rail-to-Rail Input and Output Precision Op Amp
中文描述: OP-AMP, 4000 uV OFFSET-MAX, 70 MHz BAND WIDTH, PDSO8
封装: 0.150 INCH, PLASTIC, SO-8
文件页数: 11/16页
文件大小: 266K
代理商: LT1800CS8
11
LT1800
1800f
TYPICAL PERFOR U
APPLICATIOU
Circuit Description
The LT1800 has an input and output signal range that
covers from the negative power supply to the positive
power supply. Figure 1 depicts a simplified schematic of
the amplifier. The input stage is comprised of two differ-
ential amplifiers, a PNP stage Q1/Q2 and an NPN stage Q3/
Q4 that are active over the different ranges of common
mode input voltage. The PNP differential pair is active
between the negative supply to approximately 1.2V below
W
U
U
±
5V Small-Signal Response
50mV/DIV
V
S
=
±
5V
A
V
= 1
R
L
= 1k
50ns/DIV
1800 G36
0V
Output Overdriven Recovery
V
IN
1V/DIV
V
S
= 5V, 0V
A
V
= 2
R
L
= 1k
100ns/DIV
1800 G37
0V
0V
V
2V/DIV
Q4
Q18
Q17
Q16
Q6
Q3
Q7
Q10
Q1
Q13
Q15
OUT
Q2
Q11
Q12
Q9
Q5
V
BIAS
I
1
D2
D1
D5
D4
D3
D6
D7
D8
ESDD2
ESDD1
+IN
–IN
V
ESDD3
ESDD4
V
+
V
+
V
Q8
R2
R1
R3
R4
R5
Q14
1800 F01
+
I
2
+
I
3
C2
C
C
V
+
C1
BUFFER
AND
OUTPUT BIAS
V
+
V
Q19
Figure 1. LT1800 Simplified Schematic Diagram
the positive supply. As the input voltage moves closer
toward the positive supply, the transistor Q5 will steer the
tail current I
1
to the current mirror Q6/Q7, activating the
NPN differential pair and the PNP pair becomes inactive
for the rest of the input common mode range up to the
positive supply. Also at the input stage, devices Q17 to
Q19 act to cancel the bias current of the PNP input pair.
When Q1-Q2 are active, the current in Q16 is controlled to
be the same as the current in Q1-Q2, thus the base current
±
5V Large-Signal Response
2V/DIV
V
S
=
±
5V
A
V
= 1
R
L
= 1k
200ns/DIV
1800 G35
0V
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