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参数资料
| 型号： | AD823AARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP JFET RR 17MHZ DL 8MSOP |
| 标准包装： | 1,000 |
| 放大器类型： | J-FET |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 35 V/µs |
| -3db带宽： | 19MHz |
| 电流 - 输入偏压： | 1.3pA |
| 电压 - 输入偏移： | 700µV |
| 电流 - 电源： | 6.3mA |
| 电流 - 输出 / 通道： | 44mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 36 V，±1.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
AD823A
Data Sheet
Rev. B | Page 18 of 20
Table 8. RMS Noise Contributions of Photodiode Preamp
Contributor
Expression
(μV)1
RF
2
π
N
F
f
R
4kT
55.17
VNOISE
N
F
D
F
M
S
NOISE
f
C
2C
C
V
2
π
138.5
RSS Total
149.1
1 RMS noise with RF = 50 kΩ, CS = 5 pF, CF = 1.2 pF, CM = 1.3 pF, and CD = 0.6 pF.
ACTIVE FILTER
The AD823A is an ideal candidate for an active filter because of
its low input bias current and its low input capacitance. Low
input bias current reduces dc error in the signal path while low
input capacitance improves the accuracy of the active filter.
As a general rule of thumb, the bandwidth of the amplifier should
be at least 10 times bigger than the cutoff frequency of the filter
implemented. Therefore, the AD823A is capable of implementing
active filters of up to 1.7 MHz.
0
94
39
-146
AD823A
RT
49.9
R2
1.12k
R1
1.12k
C1
200pF
+VS
–VS
VOUT
VIN
C2
100pF
Figure 46. Two-Pole Sallen-Key Active Filter
Figure 46 shows an example of a second-order Butterworth
filter, which is implemented by the Sallen-Key topology. This
structure can be duplicated to produce higher-order filters.
3
–36
–33
–30
–27
–24
–21
–18
–15
–12
–9
–6
–3
0
100
1k
10k
100k
10M
1M
M
AG
NI
T
UD
E
(
d
B)
FREQUENCY (Hz)
09
43
9-
14
7
Figure 47. Two-Pole Butterworth Active Filter Response
Figure 47 shows the two-pole Butterworth active filter’s response.
Note that it has a maximally flat pass band, a 3 dB bandwidth
of 1 MHz, and a 12 dB/octave roll-off in the stop band.
The cutoff frequency (fc) and the Q factor of the Butterworth
filter can be calculated by:
2
1
2
1
2
1
C
R
f
c
(7)
2
1
2
1
2
1
C
R
C
R
Q
(8)
Therefore, one can easily adjust the cutoff frequency by
appropriately factoring the resistor and capacitor values. For
example, a 100 kHz filter can be implemented by increasing the
values of R1 and R2 by 10 times. Note that the Q factor remains
the same in this case.
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