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參數(shù)資料
| 型號： | OP279GS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Rail-to-Rail High Output Current Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, 4000 uV OFFSET-MAX, 5 MHz BAND WIDTH, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 228K |
| 代理商： | OP279GS |
OP179/OP279
–13–
REV. F
V
IN
3
2
1
U1A
OP279
+V
S
4
–V
S
R1
31.6k
V
C1
0.01
m
F
C2
0.01
m
F
R2
31.6k
V
R5
31.6k
V
R6
31.6k
V
R4
49.9
V
HI
LO
500Hz AND UP
DC – 500Hz
6
5
7
C3
0.01
m
F
U1B
OP279
C4
0.02
m
F
R7
15.8k
V
R3
49.9
V
0.1
m
F
0.1
m
F
100
m
F/25V
100
m
F/25V
+V
S
–V
S
TO U1
+5V
–5V
COM
Figure 39. Two-Way Active Crossover Networks
In the filter sections, component values have been selected for
good balance between reasonable physical/electrical size, and
lowest noise and distortion. DC offset errors can be minimized
by using dc compensation in the feedback and bias paths, ac
bypassed with capacitors for low noise. Also, since the network
input is reactive, it should driven from a directly coupled low
impedance source at V
IN
.
Figure 40 shows this filter architecture adapted for single supply
operation from a 5 V dc source, along the lines discussed
previously.
V
IN
3
2
1
U1A
OP279
+V
S
4
R1
31.6k
V
C1
0.01
m
F
C2
0.01
m
F
R2
31.6k
V
R5
31.6k
V
R6
31.6k
V
R4
49.9
V
HI
LO
500Hz
AND UP
DC –
500Hz
6
5
7
C3
0.01
m
F
U1B
OP279
C4
0.02
m
F
R7
15.8k
V
R3
49.9
V
10
m
F
10
m
F
+
100k
V
+V
S
10
m
F
100k
V
100k
V
C
IN
10
m
F
R
IN
100k
V
0.1
m
F
100
m
F/25V
+V
S
TO U1
+5V
COM
+
100k
V
Figure 40. A Single Supply, Two-Way Active Crossover
Bandpass Configurations
The MFB bandpass filter using an OP179/OP279 section is
shown in Figure 38. This filter provides reasonably stable me-
dium Q designs for frequencies of up to a few kHz. For best
predictability and stability, operation should be restricted to
applications where the OP179/OP279 has an open-loop gain in
excess of 2Q
2
at the filter center frequency.
7
6
5
R = R3
0.1
m
F
Z
b
GIVEN:
Q, F, AND A
(PASSBAND GAIN)
ALPHA = 1/Q, H = A
O
/Q
PICK A STD C1 VALUE, THEN:
C2 = C1
R1 = 1/(H*(2*PI*F*C1))
R2 = 1/(((2*Q) –H)*(2*PI*F*C1))
R3 = Q/(PI*F*C1)
EXAMPLE: 60Hz, Q = 10,
A
O
= 10 (OR 1)
A
O
= 1 FOR '( )' VALUES
IN
R2
1.4k
V
(1.33k
V
)
OUT
U1B
OP279
R3
530k
V
C2
0.1
m
F
C1
0.1
m
F
R1
26.4k
V
(264k
V
)
Figure 38. Two-Pole, Bandpass Multiple Feedback Filters
Given the bandpass design parameters for Q, F, and pass band
gain A
O
, the design process is begun by picking a standard value
for C1. Then C2
and resistors R1-R3
are selected as per the
relationships noted. This filter is subject to a wide range of
component values by nature. Practical designs should attempt
to restrict resistances to a 1 k
to 1 M
range, with capacitor
values of 1
μ
F or less. When needed, dc bias current compensa-
tion is provided by Z
b
, where R is equal to R3.
Two-Way Loudspeaker Crossover Networks
Active filters are useful in loudspeaker crossover networks for
reasons of small size, relative freedom from parasitic effects, and
the ease of controlling low/high channel drive, plus the con-
trolled driver damping provided by a dedicated amplifier. Both
Sallen-Key (SK) VCVS and multiple-feedback (MFB) filter
architectures are useful in implementing active crossover net-
works (see Reference 4), and the circuit shown in Figure 39 is
a two-way active crossover which combines the advantages of
both filter topologies. This active crossover exhibits less than
0.01% THD+N at output levels of 1 V rms using general pur-
pose unity gain HP/LP stages. In this two-way example, the LO
signal is a dc-500 Hz LP woofer output, and the HI signal is the
HP (> 500 Hz) tweeter output. U1B forms a MFB LP section
at 500 Hz, while U1A provides a SK HP section, covering fre-
quencies
≥
500 Hz.
This crossover network is a Linkwitz-Riley type
(see Reference
5), with a damping factor or
α
of 2 (also referred to as
“Butterworth squared”). A hallmark of the Linkwitz-Riley type
of filter is the fact that the summed magnitude response is flat
across the pass band. A necessary condition for this to happen
is the relative signal polarity of the HI output must be inverted
with respect to the LOW outputs. If only SK filter sections
were used, this requires that the connections to one speaker be
reversed on installation. Alternately, with one inverting stage
used in the LO channel, this accomplishes the same effect. In
the circuit as shown, stage U1B is the MFB LP filter which
provides the necessary polarity inversion. Like the SK sections,
it is configured for unity gain and an
α
of 2. The cutoff frequency
is 500 Hz, which complements the SK HP section of U4.
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