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參數資料
| 型號： | AD8531AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Cost, 250 mA Output Single-Supply Amplifiers |
| 中文描述： | OP-AMP, 30000 uV OFFSET-MAX, 2.2 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數： | 12/16頁 |
| 文件大小： | 417K |
| 代理商： | AD8531AR |
AD8531/AD8532/AD8534
REV. D
–12–
A Single-Supply Headphone Amplifier
Because of its speed and large output drive, the AD8531/AD8532/
AD8534 makes an excellent headphone driver, as illustrated in
Figure 40. 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 head-
phone, the amplifier inputs are biased to V+/2, which in this
case is 2.5 V. The 100 k
W
resistor to the positive supply is
equally split into two 50 k
W
resistors, with their common point
bypassed by 10
m
F to prevent power supply noise from contami-
nating the audio signal.
The audio signal is then ac-coupled to each input through a
10
m
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 270
m
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
W
to 600
W
. An additional
16
W
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
W
load, the circuit exhibits less than
0.3% THD+N at output drive levels of 4 V p-p.
1/2
AD8532
16
50k
270 F
LEFT
HEADPHONE
10 F
50k
50k
100k
10 F
LEFT
INPUT
1/2
AD8532
16
50k
270 F
RIGHT
HEADPHONE
10 F
50k
50k
100k
10 F
RIGHT
INPUT
V
V 5V
1 F/0.1 F
V 5V
Figure 40. A Single-Supply, Stereo Headphone Driver
A Single-Supply, Two-Way Loudspeaker Crossover Network
Active filters are useful in loudspeaker crossover networks for
reasons of small size, relative freedom from parasitic effects, the
ease of controlling low/high channel drive and the controlled driver
damping provided by a dedicated amplifier. Both Sallen-Key
(SK) and multiple-feedback (MFB) filter architectures are use-
ful in implementing active crossover networks. The circuit
shown in Figure 41 is a single-supply, two-way active crossover
which combines the advantages of both filter topologies. This
active crossover exhibits less than 0.4% THD+N at output levels
of 1.4 V rms using general purpose 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 an LP section at 500 Hz, while
U1A provides a HP section, covering frequencies
≥
500 Hz.
V
IN
3
2
1
U1A
AD8532
V
S
4
R1
31.6k
C1
0.01 F
C2
0.01 F
R2
31.6k
R5
31.6k
R6
31.6k
R4
49.9
HI
LO
500Hz
AND UP
DC –
500Hz
6
5
7
C3
0.01 F
U1B
AD8532
C4
0.02 F
R7
15.8k
R3
49.9
270 F
+
270 F
+
100k
V
S
10 F
100k
100k
C
IN
10 F
R
IN
100k
0.1 F
100 F/25V
V
S
TO U1
5V
COM
100k
Figure 41. A Single-Supply, Two-Way Active Crossover
The crossover example frequency of 500 Hz can be shifted
lower or higher by frequency scaling of either resistors or
capacitors. In configuring the circuit for other frequencies,
complementary LP/HP action must be maintained between
sections, and component values within the sections must be in
the same ratio. Table II provides a design aid to adaptation,
with suggested standard component values for other frequencies.
Table II. RC Component Selection for Various
Crossover Frequencies
Crossover
Frequency (Hz)
100
200
319
500
1 k
2 k
5 k
10 k
R1/C1 (U1A)
1
R5/C3 (U1B)
2
160 k
W
/0.01
m
F
80.6 k
W
/0.01
m
F
49.9 k
W
/0.01
m
F
31.6 k
W
/0.01
m
F
16 k
W
/0.01
m
F
8.06 k
W
/0.01
m
F
3.16 k
W
/0.01
m
F
1.6 k
W
/0.01
m
F
NOTES
Applicable for filter
a
= 2.
1
For Sallen-Key stage U1A: R1 = R2, and C1 = C2, etc.
2
For Multiple Feedback stage U1B: R6 = R5, R7 = R5/2, and
C4 = 2C3.
For additional information on the active filters and active cross-
over networks, please consult the data sheet for the OP279, a
dual rail-to-rail high-output current operational amplifier.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8531AR-REEL | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 6V 8-Pin SOIC N T/R |
| AD8531ART | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, 250 mA Output Single-Supply Amplifiers |
| AD8531ART-REEL | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 6V 5-Pin SOT-23 T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE 250MA RAIL TO RAIL OP AMP - Tape and Reel |
| AD8531ART-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 6V 5-Pin SOT-23 T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE 250MA RAIL TO RAIL OP AMP - Tape and Reel |
| AD8531ARTZ-REEL | 功能描述:IC OPAMP GP R-R CMOS SOT23-5 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:160 系列:- 放大器類型:通用 電路數:4 輸出類型:滿擺幅 轉換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC N 包裝:管件 |
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