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| 型號： | AD8542AR-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/20頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R CMOS 1MHZ 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.92 V/µs |
| 增益帶寬積： | 1MHz |
| 電流 - 輸入偏壓： | 4pA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 45µA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | AD8542AR-REEL7DKR |
AD8541/AD8542/AD8544
Rev. G | Page 14 of 20
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 36 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 37. 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.
1/2 AD8542
5
6
7
8
3
2
4
1
1/2 AD8542
5.0V
U1
VOUT
U2
R2
2.5k
R1
97.5k
2.5VREF
C
26.7nF
C
26.7nF
2.5VREF
R/2
50k
R
100k
R
100k
2C
53.6F
f0 =
1
2πRC
1
R1
R1 + R2
4 1 –
0
093
5-
03
5
VIN
Figure 36. 60 Hz Twin-T Notch Filter, Q = 10
C
2C
R/2
RR
7
3
2
4
6
AD8541
5.0V
C
VOUT
2.5VREF
VIN
009
35
-0
36
U1
Figure 37. 60 Hz Twin-T Notch Filter, Q = ∞ (Ideal)
Figure 38 is an example of the AD8544 in a notch filter circuit. The
frequency dependent negative resistance (FDNR) notch filter has
fewer critical matching requirements than the twin-T notch, where
as the Q of the FDNR is directly proportional to a single resistor R1.
Although matching component values is still important, it is also
much easier and/or less expensive to accomplish in the FDNR
circuit. For example, the twin-T notch uses three capacitors
with two unique values, whereas the FDNR 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
10
8
9
2
1
3
1/4 AD8544
12
14
13
5
7
U3
U1
U4
U2
C2
1F
C1
1F
R1
Q ADJUST
200
R
2.61k
R
2.61k
R
2.61k
R
2.61k
VOUT
2.5VREF
NC
f =
1
2π LC1
L = R2C2
00
93
5-
0
37
VIN
Figure 38. FDNR 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 39 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
VOUT
2.5VREF
VIN
R2
1M
2.5VDC
00
935
-0
38
Figure 39. AD854x Comparator Application—Overload Detector
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| AD8542ARU | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R I/O 5.5V 8-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述:DUAL, LOW PWR RAIL/RAIL OP AMP - Bulk |
| AD8542ARU-REEL | 功能描述:IC OPAMP GP R-R CMOS 1MHZ 8TSSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
| AD8542ARUZ | 功能描述:IC OPAMP GP R-R CMOS 1MHZ 8TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| AD8542ARUZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:General-Purpose CMOS Rail-to-Rail Amplifiers |
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