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參數資料
| 型號： | AD8631 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers |
| 中文描述： | 1.8伏，5兆赫軌到軌低功耗運算放大器 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 157K |
| 代理商： | AD8631 |
AD8631/AD8632
–9–
REV. 0
The rail-to-rail feature of the AD8631 can be observed over the
supply voltage range, 1.8 V to 5 V. Traces are shown offset for
clarity.
INPUT BIAS CONSIDERATION
The input bias current (I
B
) is a non-ideal, real-life parameter that
affects all op amps. I
B
can generate a somewhat significant offset
voltage. This offset voltage is created by I
B
when flowing through
the negative feedback resistor R
F
. If I
B
is 250 nA (worst case), and
R
F
is 100 k
, the corresponding generated offset voltage is 25 mV
(V
OS
= I
B
R
F
).
Obviously the lower the R
F
the lower the generated voltage offset.
Using a compensation resistor, R
B
, as shown in Figure 21, can
minimize this effect. With the input bias current minimized we
still need to be aware of the input offset current (I
OS
) which will
generate a slight offset error. Figure 21 shows three different
configurations to minimize I
B
-induced offset errors.
NONINVERTING CONFIGURATION
AD8631
R
S
V
I
V
OUT
R
F
= R
S
UNITY GAIN BUFFER
V
OUT
R
F
R
I
R
B
= R
I
R
F
V
I
V
OUT
R
B
= R
I
R
F
V
I
R
F
R
I
AD8631
INVERTING CONFIGURATION
AD8631
Figure 21. Input Bias Cancellation Circuits
Q14
IN
V
EE
V
CC
V
OUT
Q1
Q3
R5
R6
I2
R1
IN
R2
R4
R3
I1
R7
R8
D2
ESD
D7
D8
Q2
Q4
D1
ESD
D3
ESD
D4
ESD
Q5
Q6
Q7
C1
Q8
Q11
Q9
I4
I3
I5
Q13
I7
I6
C3
R10
R9
R11
Q15
Q17
D6
R12
Q18
I8
C2
R14
Q19
Q20
C4
D9
V
CC
D16
R13
V
EE
Q10
Figure 19. Simplified Schematic
Table I. Typical Battery Life Voltage Range
Nominal
Voltage (V)
End-of-Voltage
Discharge (V)
Battery
Lead-Acid
Lithium
NiMH
NiCd
Carbon-Zinc
2
2.6–3.6
1.2
1.2
1.5
1.8
1.7–2.4
1
1
1.1
RAIL-TO-RAIL INPUT AND OUTPUT
The AD8631 features an extraordinary rail-to-rail input and
output with supply voltages as low as 1.8 V. With the amplifier’s
supply set to 1.8 V, the input can be set to 1.8 V p-p, allowing the
output to swing to both rails without clipping. Figure 20 shows a
scope picture of both input and output taken at unity gain, with a
frequency of 1 kHz, at V
S
= 1.8 V and V
IN
= 1.8 V p-p.
TIME
–
200 s/Div
V
S
= 1.8V
V
IN
= 1.8V p-p
V
IN
V
OUT
Figure 20. Rail-to-Rail Input Output
相關PDF資料 |
PDF描述 |
|---|---|
| AD8631ART | 1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers |
| AD8632 | 1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers |
| AD8632AR | 1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers |
| AD8632ARM | 1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers |
| AD8638 | 16V Auto-Zero, Rail-to-Rail Output, Precision Amplifiers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD86310001RTR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD8631ART | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers |
| AD8631ART-R2 | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 6V 5-Pin SOT-23 T/R 制造商:Analog Devices 功能描述:IC OP-AMP SINGLE R/R |
| AD8631ART-REEL7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD8631ARTZ-REEL7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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