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參數(shù)資料
| 型號： | OP279GP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 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, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 228K |
| 代理商： | OP279GP |
OP179/OP279
–11–
REV. F
UNITY-GAIN, SALLEN-KEY (VCVS) FILTERS
High Pass Configurations
In Figure 35a is the HP form of a unity-gain 2-pole SK filter
using an OP179/OP279 section. For this filter and its LP coun-
terpart, the gain in the passband is inherently unity, and the
signal phase is noninverting due to the follower hookup. For
simplicity and practicality, capacitors C1-C2
are set equal, and
resistors R2-R1
are adjusted to a ratio “N,” which provides the
filter damping “
α
” as per the design expressions. A HP design
is begun with selection of standard capacitor values for C1 and
C2 and a calculation of N; then R1 and R2 are calculated as per
the figure expressions.
In these examples,
α
(or 1/Q) is set equal to
√
2
, providing a
Butterworth (maximally flat) response characteristic. The filter
corner frequency is normalized to 1 kHz, with resistor values
shown in both rounded and (exact) form. Various other 2-pole
response shapes are also possible with appropriate selection of
α
. For a given response type (
α
), frequency can be easily scaled,
using proportional R or C values.
+V
S
–V
S
U1A
OP279
1
3
2
4
8
IN
R2
22k
V
(22.508k
V
)
R1
11k
V
(11.254k
V
)
C2
0.01
m
F
R = R2
0.1
m
F
Z
f
(HIGH PASS)
C1
0.01
m
F
GIVEN: ALPHA, F
SET C1 = C2 = C
ALPHA = 2/(N^0.5) = 1/Q
N = 4/(ALPHA)^2 = R2/R1
R1 = 1/(2*PI*F*C* (N^0.5))
R2 = N*R1
1kHz BW SHOWN
OUT
7
5
6
R = R1+R2
Z
f
(LOW PASS)
GIVEN: ALPHA, F
SET R1 = R2 = R
ALPHA = 2/(M^0.5) = 1/Q
N = 4/(ALPHA)^2 = C2/C1
PICK C1
C1 = M*C1
R = 1/(2*P1*F*C1* (M^0.5))
1kHz BW SHOWN
IN
R2
11k
V
(11.254k
V
)
C2
0.01
m
F
0.1
m
F
C1
0.02
m
F
OUT
U1B
OP279
R1
11k
V
(11.254k
V
)
a. High Pass
b. Low Pass
Figure 35. 2-Pole Unity-Gain Sallen Key HP/LP Filters
Low Pass Configurations
In the LP SK arrangement of Figure 35b, R and C elements are
interchanged, and the resistors are made equal. Here the C2/C1
ratio “M” is used to set the filter
α
, as noted. This design is begun
with the choice of a standard capacitor value for C1 and a calcu-
lation of M, which forces a value of “M
×
C1” for C2. Then, the
value “R” for R1 and R2 is calculated as per the expression.
For highest performance, the passive components used for tun-
ing active filters deserve attention. Resistors should be 1%, low
TC, metal film types of the RN55 or RN60 style, or similar.
A Single Supply Headphone Amplifier
Because of its high speed and large output drive, the OP179/
OP279 makes for an excellent headphone driver, as illustrated
in Figure 34. Its low supply operation and rail-to-rail inputs
and outputs give a maximum signal swing on a single +5 V
supply. To ensure maximum signal swing available to drive the
headphone, the amplifier inputs are biased to V+/2, which is in
this case 2.5 V. The 100 k
resistor to the positive supply is
equally split into two 50 k
with their common point bypassed
by 10
μ
F to prevent power supply noise from contaminating the
audio signal.
16
V
50k
V
220
m
F
LEFT
HEADPHONE
10
m
F
50k
V
50k
V
100k
V
10
m
F
LEFT
INPUT
+V + 5V
1/2
OP279
16
V
50k
V
220
m
F
RIGHT
HEADPHONE
10
m
F
50k
V
50k
V
100k
V
10
m
F
RIGHT
INPUT
+V
+V + 5V
1/2
OP279
Figure 34. A Single Supply, Stereo Headphone Driver
The audio signal is then ac-coupled to each input through a
10
μ
F capacitor. A large value is needed to ensure that the
20 Hz audio information is not blocked. If the input already has
the proper dc bias, the ac coupling and biasing resistors are not
required. A 220
μ
F capacitor is used at the output to couple the
amplifier to the headphone. This value is much larger than that
used for the input because of the low impedance of the head-
phones, which can range from 32
to 600
. An additional
16
resistor is used in series with the output capacitor to pro-
tect the op amp’s output stage by limiting capacitor discharge
current. When driving a 48
load, the circuit exhibits less than
0.02% THD+N at low output drive levels (not shown). The
OP179/OP279’s high current output stage can drive this heavy
load to 4 V p-p and maintain less than 1% THD+N.
Active Filters
Several active filter topologies are useful with the OP179/OP279.
Among these are two popular architectures, the familiar Sallen-
Key (SK) voltage controlled voltage source (VCVS) and the
multiple feedback (MFB) topologies. These filter types can be
arranged for high pass (HP), low pass (LP), and bandpass (BP)
filters. The SK filter type uses the op amp as a fixed gain voltage
follower at unity or a higher gain, while the MFB structure uses
it as an inverting stage. Discussed here are simplified, 2-pole
forms of these filters, highly useful as system building blocks.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OP279GRU | 制造商:AD 制造商全稱:Analog Devices 功能描述:Rail-to-Rail High Output Current Operational Amplifiers |
| OP279GRU-REEL | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R I/O 制造商:Rochester Electronics LLC 功能描述:RAIL-RAIL HI OUTPUT OPAMP - Tape and Reel |
| OP279GRUZ-REEL | 功能描述:IC OPAMP GP R-R 5MHZ DUAL 8TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品培訓模塊:Differential Circuit Design Techniques for Communication Applications 標準包裝:1 系列:- 放大器類型:RF/IF 差分 電路數(shù):1 輸出類型:差分 轉(zhuǎn)換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤，CSP 供應商設備封裝:16-LFCSP-VQ 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:551 (CN2011-ZH PDF) 其它名稱:ADL5561ACPZ-R7CT |
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