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參數資料
| 型號： | AD8544AR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | General-Purpose CMOS Rail-to-Rail Amplifiers |
| 中文描述： | QUAD OP-AMP, 7000 uV OFFSET-MAX, 0.98 MHz BAND WIDTH, PDSO14 |
| 封裝： | MS-012AB, SOIC-14 |
| 文件頁數： | 13/20頁 |
| 文件大小： | 305K |
| 代理商： | AD8544AR-REEL |
AD8541/AD8542/AD8544
APPLICATIONS
NOTCH FILTER
The AD854x have very high open-loop gain (especially with a
supply voltage below 4 V), which makes it useful for active
filters of all types. For example, Figure 35 illustrates the AD8542
in the classic twin-T notch filter design. The twin-T notch is
desired for simplicity, low output impedance, and minimal use
of op amps. In fact, this notch filter can be designed with only
one op amp if Q adjustment is not required. Simply remove U2
as illustrated in Figure 36. However, a major drawback to this
circuit topology is ensuring that all the Rs and Cs closely match.
The components must closely match or notch frequency offset
and drift causes the circuit to no longer attenuate at the ideal
notch frequency. To achieve desired performance, 1% or better
component tolerances or special component screens are usually
required. One method to desensitize the circuit-to-component
mismatch is to increase R2 with respect to R1, which lowers Q.
A lower Q increases attenuation over a wider frequency range
but reduces attenuation at the peak notch frequency.
Rev. E | Page 13 of 20
1/2 AD8542
5
6
7
8
3
2
4
1
1/2 AD8542
5.0V
U1
V
OUT
U2
R2
2.5k
R1
97.5k
2.5V
REF
C
26.7nF
C
26.7nF
2.5V
REF
R/2
50k
R
100k
R
100k
C2
53.6μF
f
0
=
f
0
=
1
2
π
RC
1
R1
R1 + R2
4 1 –
0
Figure 35. 60 Hz Twin-T Notch Filter, Q = 10
C
2C
R/2
R
R
7
3
2
4
6
AD8541
5.0V
C
V
OUT
2.5V
REF
V
IN
0
Figure 36. 60 Hz Twin-T Notch Filter, Q = ∞ (Ideal)
Figure 37 is an example of the AD8544 in a notch filter circuit.
The frequency dependent negative resistance (FNDR) notch
filter has fewer critical matching requirements than the twin-T
notch and for the FNDR Q is directly proportional to a single
resistor R1. While matching component values is still
important, it is also much easier and/or less expensive to
accomplish in the FNDR circuit. For example, the twin-T notch
uses three capacitors with two unique values, whereas the
FNDR circuit uses only two capacitors, which may be of the
same value. U3 is simply a buffer that is added to lower the
output impedance of the circuit.
4
1/4 AD8544
11
6
1/4 AD8544
14
U4
1/4 AD8544
10
8
9
2
1
3
1/4 AD8544
12
13
5
7
U3
U1
U2
C2
1μF
C1
1μF
R1
Q ADJUST
200
R
2.61k
R
2.61k
R
2.61k
R
2.61k
V
OUT
2.5V
REF
2.5V
REF
2.5V
REF
NC
f =
1
2
π
LC1
L = R
2
C2
0
Figure 37. FNDR 60 Hz Notch Filter with Output Buffer
COMPARATOR FUNCTION
A comparator function is a common application for a spare op
amp in a quad package. Figure 38 illustrates of the AD8544 as
a comparator in a standard overload detection application.
Unlike many op amps, the AD854x family can double as
comparators because this op amp family has a rail-to-rail
differential input range, rail-to-rail output, and a great speed
vs. power ratio. R2 is used to introduce hysteresis. The AD854x,
when used as comparators, have 5 μs propagation delay at 5 V
and 5 μs overload recovery time.
1/4 AD8541
R1
1k
V
OUT
2.5V
REF
V
IN
R2
1M
2.5V
DC
0
Figure 38. AD854x Comparator Application—Overload Detector
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