+VS VIN R3 10k" />
參數(shù)資料
型號: AD713JNZ
廠商: Analog Devices Inc
文件頁數(shù): 7/20頁
文件大?。?/td> 0K
描述: IC OPAMP BIFET QUAD PREC 14DIP
標準包裝: 25
放大器類型: J-FET
電路數(shù): 4
轉(zhuǎn)換速率: 20 V/µs
-3db帶寬: 4MHz
電流 - 輸入偏壓: 55pA
電壓 - 輸入偏移: 300µV
電流 - 電源: 10mA
電流 - 輸出 / 通道: 25mA
電壓 - 電源,單路/雙路(±): 9 V ~ 36 V,±4.5 V ~ 18 V
工作溫度: 0°C ~ 70°C
安裝類型: 通孔
封裝/外殼: 14-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 14-PDIP
包裝: 管件
產(chǎn)品目錄頁面: 766 (CN2011-ZH PDF)
AD713
Rev. F | Page 15 of 20
1/4
AD713
A1
+VS
VIN
R3
10k
R4
30k
C1
1000pF
C3
33pF
HIGH
PASS
OUTPUT
R5
30k
+
1F
4
2
3
1
1/4
AD713
A2
6
5
7
1/4
AD713
A3
9
10
8
AD7528
VDD
DAC B1
RF
18
19
20
2
1
5
6
16
15
17
14
7
DB0 TO
DB7
DATA 1
DAC A/
DACB
WR
CS
DAC A1
RS
AD7528
VDD
20
18
2
1
5
6
16
15
17
14
7
DB0 TO
DB7
DATA 2
DAC A/
DAC B
WR
CS
DAC A2
R1
4
C2
1000pF
1/4
AD713
A4
13
12
14
DAC B2
R2
–VS
BAND PASS
OUTPUT
LOW PASS
OUTPUT
1F
11
+
CIRCUIT EQUATIONS
C1 = C2, R1 = R2, R4 = R5
fC =
1
2π R1 C1
AO = –
RF
RS
256 × (DAC LADDER RESISTANCE)
DAC DIGITAL CODE
DAC EQUIVALENT RESISTANCE EQUALS
Q =
×
R3
R4
RF
RFBB1
0082
4-
046
Figure 44. A Programmable State Variable Filter Circuit
GIC AND FDNR FILTER APPLICATIONS
The closely matched and uniform ac characteristics of the AD713
make it ideal for use in generalized impedance converter (GIC)/
gyrator and frequency dependent negative resistor (FDNR)
filter applications. Figure 47 and Figure 48 show the AD713
used in two typical active filters. The first shows a single AD713
simulating two coupled inductors configured as a one-third
octave band-pass filter. A single section of this filter meets
ANSI Class II specifications and handles a 7.07 V rms signal
with <0.002% THD (20 Hz to 20 kHz).
Figure 48 shows a seven-pole antialiasing filter for a 2× over-
sampling (88.2 kHz) digital audio application. This filter has
<0.05 dB pass-band ripple and 19.8 μs ± 0.3 μs delay, at dc to
20 kHz, and handles a 5 V rms signal (VS = ±15 V) with no
overload at any internal nodes.
The filter of Figure 47 can be scaled for any center frequency by
using the following formula:
RC
f
C
π
2
11
.
1
=
where all resistors and capacitors scale equally. Resistors R3 to
R8 should not be greater than 2 kΩ in value to prevent parasitic
oscillations caused by the amplifier’s input capacitance.
If this is not practical, add small lead capacitances (10 pF to
20 pF) across R5 and R6. Figure 45 and Figure 46 show the
output amplitude vs. frequency of these filters.
0
–10
–20
–30
–40
–50
–60
–70
0
1020
30
40
5060
70
80
90
100
FREQUENCY (MHz)
O
UT
P
UT
A
M
P
L
IT
UD
E
(
d
Bm)
0
0824
-048
O
UT
P
UT
A
M
P
L
IT
UD
E
(
d
Bm)
0
–1
–2
–3
–4
–5
16 18 20
FREQUENCY (MHz)
22 24
Figure 45. Output Amplitude vs. Frequency of 1/3 Octave Filter
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
10k
100k
1M
FREQUENCY (MHz)
R
E
L
A
T
IVE
O
U
T
PU
T
A
M
PL
IT
U
D
E
(d
B
)
00
824-
049
3
2
1
0
–1
200
500 1k
2k
s
d
B
5k
10k 20k
200
500 1k
2k
5k
10k 20k
18
19
20
21
22
OUTPUT AMPLITUDE
GROUP DELAY
Figure 46. Relative Output Amplitude vs. Frequency of Antialiasing Filter
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