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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)
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
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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| AD713JNZ | 功能描述:IC OPAMP BIFET QUAD PREC 14DIP RoHS:是 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):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°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:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD713JR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
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