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參數(shù)資料
| 型號： | AD7564BRS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | CLB Strip Light 200mm Red CE RoHS; Mounting Style: Horizontal/Vertical Mount; Functions: Continuous light; Light Type: LED; Rated Voltage: 24V DC; Style: Strip Light; Color: Red; Diameter: 200mm long; Applicable Model: CLB |
| 中文描述： | QUAD, SERIAL INPUT LOADING, 0.55 us SETTLING TIME, 12-BIT DAC, PDSO28 |
| 封裝： | SSOP-28 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 392K |
| 代理商： | AD7564BRS |
–15–
REV. A
3
AD7564
APPLICATIONS
Programmable State Variable Filter
The AD7564 with its multiplying capability and fast settling
time is ideal for many types of signal conditioning applications.
The circuit of Figure 25 shows its use in a state variable filter
design. This type of filter has three outputs: low pass, high pass
and bandpass. The particular version shown in Figure 25 uses
the AD7564 to control the critical parameters f
O
, Q and A
O
. In-
stead of several fixed resistors, the circuit uses the DAC equiva-
lent resistances as circuit elements.
Thus, R1 in Figure 25 is controlled by the 12-bit digital word
loaded to DAC A of the AD7564. This is also the case with R2,
R3 and R4. The fixed resistor R5 is the feedback resistor, R
FB
B.
DAC Equivalent Resistance, R
EQ
=
(R
LADDER
×
4
096)/N
where:
R
LADDER
is the DAC ladder resistance
N
is the DAC Digital Code in Decimal (0 < N < 4096)
In the circuit of Figure 25:
C1 = C2, R7 = R8, R3 = R4 (i.e., the same code is loaded to
each DAC).
Resonant Frequency
,
f
O
= 1/(2
π
R
3
C
1)
Quality Factor
,
Q
= (
R
6/
R
8)
×
(
R
2/
R
5)
Bandpass Gain
,
A
O
= –
R
2/
R
1
Using the values shown in Figure 25, the Q range is 0.3 to 5 and
the f
O
range is 0 to 12 kHz.
R8
30k
HIGH
PASS
OUTPUT
C1 1000pF
C2 1000pF
LOW
PASS
OUTPUT
A2
A3
A4
A1
C3 10pF
BAND
PASS
OUTPUT
R6
10k
V
IN
V
REF
A
I
OUT1
A
I
OUT1
B
R
FB
B
V
REF
C
I
OUT1
C
V
REF
D
I
OUT1
D
V
REF
B
AD7564
I
OUT2
A
I
OUT2
B
I
OUT2
C
I
OUT2
D
DAC B
(R2)
DAC C
(R3)
DAC D
(R4)
R7
30k
R5
DAC A
(R1)
AGND
NOTES
1. A1, A2, A3, A4, : 1/4 X AD713.
2. DIGITAL INPUT CONNECTIONS ARE OMITTED.
3. C3 IS A COMPENSATION CAPACITOR TO ELIMINATE Q AND GAIN VARIATIONS
CAUSED BY AMPLIFIER GAIN AND BANDWIDTH LIMITATIONS.
Figure 25. Programmable 2nd Order State Variable Filter
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