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| 型號： | AD8295ACPZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 17/28頁 |
| 文件大小： | 0K |
| 描述： | IC AMP INST 1MHZ TRPL LN 16LFCSP |
| 產(chǎn)品培訓模塊： | Top Five Instrumentation Amplifier Problems |
| 標準包裝： | 1 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 3 |
| 轉(zhuǎn)換速率： | 2 V/µs |
| 增益帶寬積： | 1MHz |
| -3db帶寬： | 1.2MHz |
| 電流 - 輸入偏壓： | 500pA |
| 電壓 - 輸入偏移： | 120µV |
| 電流 - 電源： | 2mA |
| 電流 - 輸出 / 通道： | 18mA |
| 電壓 - 電源，單路/雙路(±)： | 4.6 V ~ 36 V，±2.3 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VQFN，CSP |
| 供應商設備封裝： | 16-LFCSP（4x4） |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 771 (CN2011-ZH PDF) |
| 其它名稱： | AD8295ACPZ-R7DKR |
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AD8295
Rev. A | Page 24 of 2
8
TWO-POLE SALLEN-KEY FILTER
Figure 69 shows the in-amp output section of the AD8295 being
low-pass filtered using a two-pole Sallen-Key filter. The filter
section consists of Op Amp A2, External Resistors R1 and R2,
as well as Capacitors C1 and C2. Resistor R3 compensates for
input offset current errors and is equal to the parallel combination
of R1 and R2. The ratio of capacitance between C1 and C2 sets
the filter quality factor, Q. For most applications, a filter Q of 0.5
to 0.7 provides a good trade-off between performance and sta-
bility. High Q, nonpolarized capacitors, such as NPO ceramic,
should be used. The exact pole frequencies are dependent on
the tolerance of the resistors and capacitors used.
A1
OUT
A1
R2
A2
+IN
A2
–IN
–INPUT
+INPUT
RG
+VS
OUT
R1
R2
C2
RG
+IN
0.1F
–VS
REF
1
2
3
4
8
7
6
5
13
14
15
16
A1
IA
A2
R1
20k
R2
20k
A2
OUT
AD8295
A1
+IN
LOW-PASS
FILTERED
OUTPUT
A1
R1
A1
–IN
12
11
10
9
0.1F
R3
C1
07
34
3-
01
2
Figure 69. Two-Pole Sallen-Key Filter
The design equations for a Sallen-Key filter can be greatly
simplified if the resistors and capacitors are made equal.
When C1 = C2 and R1 = R2, Q is 0.5 and the design equation
simplifies to
f = 1/(2πRC)
where R is in ohms and C is in farads.
For example, with R1 = R2 = 10 kΩ, and C1 = C2 = 2.2 nF,
f = 7.2 kHz
When C1 is not equal to C2 and R1 is not equal to R2, the
values of Q and the cutoff frequency are calculated as follows:
)
(
R2
R1
C2
+
C2
C1
R2
R1
Q =
C2
C1
R2
R1
f
π
=
2
1
AC-COUPLED INSTRUMENTATION AMPLIFIER
The circuit in Figure 70 provides a single-pole high-pass filter,
using only one external capacitor.
At low frequencies, Capacitor C1 has a high impedance, thus
operating Op Amp A1 at high gain (G = XC/20 kΩ). Because of
its high gain, Op Amp A1 is able to drive the in-amp reference
pin until it forces the output of the in-amp to 0 V. Therefore, no
signal appears at the circuit output.
At higher frequencies, the gain of Op Amp A1 drops and the
op amp is no longer able to maintain the in-amp output at 0 V.
Therefore, at frequencies above the RC filter bandwidth, the
in-amp operates in a normal manner, and the signal appears at
the output.
The 3 dB corner frequency is set by Internal Resistor R1 and
External Capacitor C1 as follows:
f = 1/((2π × 20 kΩ) × C1)
The precision of R1 (better than 0.2%) means that the filter
bandwidth depends mainly on the tolerance of Capacitor C1.
At low frequencies, Op Amp A1 drives the appropriate voltage
on the reference pin to null out the original signal. Voltage
supplies should be chosen so that Op Amp A1 has enough
output headroom to produce the nulling voltage.
A1 OUT
A1 R2
A2 +IN
A2 –IN
+VS
–VS
OUT
REF
1
2
3
4
8
6
5
13
14
15
16
A1
IA
A2
R1
20k
R2
20k
A2 OUT
OUTPUT
AD8295
A1 +IN
A1 R1
A1 –IN
12
11
10
9
07
34
3-
0
15
7
C1
–IN
–INPUT
RG
+IN
+INPUT
Figure 70. AC-Coupled Connection
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| AD8295ACPZ-RL | 功能描述:IC AMP INST 1MHZ TRPL LN 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| AD8295ACPZ-WP | 功能描述:IC AMP INST 1MHZ TRPL LN 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝: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） 供應商設備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| AD8295BCPZ-R7 | 功能描述:IC AMP INST 1MHZ TRPL LN 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-PDIP 包裝:管件 |
| AD8295BCPZ-RL | 功能描述:IC IN AMP PREC FE +/-18V 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-PDIP 包裝:管件 |
| AD8295BCPZ-WP | 功能描述:IC IN AMP PREC FE +/-18V 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝: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） 供應商設備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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