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參數(shù)資料
| 型號： | OP279 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Rail-to-Rail High Output Current Operational Amplifier(滿幅度高輸出電流運(yùn)放) |
| 中文描述： | 軌到軌高輸出電流運(yùn)算放大器（滿幅度高輸出電流運(yùn)放） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 327K |
| 代理商： | OP279 |
OP279
–11–
REV. D
UNIT Y -GAIN, SALLE N-K E Y (VCVS) FILT E RS
High Pass Configurations
In Figure 35a is the HP form of a unity-gain 2-pole SK filter
using an OP279 section. For this filter and its LP counterpart,
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. T he 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
A Single-Supply Headphone Amplifier
Because of its high speed and large output drive, the 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.
T o insure maximum signal swing available to drive the head-
phone, the amplifier inputs are biased to V+/2, which is in this
case 2.5 V. T he 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
T he 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, then 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. T his value is much larger than
that used for the input because of the low impedance of the
headphones, which can range from 32
to 600
. An addi-
tional 16
resistor is used in series with the output capacitor to
protect the op amp’s output stage by limiting capacitor dis-
charge current. When driving a 48
load, the circuit exhibits
less than 0.02% T HD+N at low output drive levels (not
shown). T he OP279’s high current output stage can drive this
heavy load to 4 V p-p and maintain less than 1% T HD+N.
Active Filters
Several active filter topologies are useful with the OP279.
Among these are two popular architectures, the familiar Sallen-
K ey (SK ) voltage controlled voltage source (VCVS) and the
multiple feedback (MFB) topologies. T hese filter types can be
arranged for high pass (HP), low pass (LP), and bandpass (BP)
filters. T he 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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP2790006SR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OP279GP | 制造商:Analog Devices 功能描述:OP AMP DUAL HIGH O/P RRI/O 279 制造商:Analog Devices Inc. 功能描述:Rail-to-Rail High Output Current Operational Amplifiers |
| 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(xùn)模塊:Differential Circuit Design Techniques for Communication Applications 標(biāo)準(zhǔn)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(yīng)商設(shè)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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