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参数资料
| 型号： | AD8531ART |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 运动控制电子 |
| 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, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 11/16页 |
| 文件大小： | 417K |
| 代理商： | AD8531ART |
AD8531/AD8532/AD8534
REV. D
–11–
A High Output Current, Buffered Reference/Regulator
Many applications require stable voltage outputs relatively close
in potential to an unregulated input source. This “low drop-
out” type of reference/regulator is readily implemented with a
rail-to-rail output op amp, and is particularly useful when using
a higher current device such as the AD8531/AD8532/AD8534.
A typical example is the 3.3 V or 4.5 V reference voltage devel-
oped from a 5 V system source. Generating these voltages
requires a three terminal reference, such as the REF196 (3.3 V)
or the REF194 (4.5 V), both which feature low power, with
sourcing outputs of 30 mA or less. Figure 38 shows how such a
reference can be outfitted with an AD8531/AD8532/AD8534
buffer for higher currents and/or voltage levels, plus sink and
source load capability.
C2
0.1 F
R2
10k 1%
V
OUT1
=
3.3V @ 100mA
R5
0.2
C5
100 F/16V
TANTALUM
R1
10k
1%
C1
0.1 F
V
S
5V
V
OUT2
=
3.3V
C4
1 F
6
2
3
4
V
OUT
COMMON
C3
0.1 F
V
C
ON/OFF
CONTROL
INPUT CMOS HI
(OR OPEN) = ON
LO = OFF
V
S
COMMON
R3
(SeeText)
R4
3.3k
U2
AD8531
U1
REF196
Figure 38. A High Output Current Reference/Regulator
The low dropout performance of this circuit is provided by
stage U2, an AD8531 connected as a follower/buffer for the basic
reference voltage produced by U1. The low voltage saturation
characteristic of the AD8531/AD8532/AD8534 allows up to
100 mA of load current in the illustrated use, as a 5 V to 3.3 V
converter with good dc accuracy. In fact, the dc output voltage
change for a 100 mA load current delta measured less than
1 mV. This corresponds to an equivalent output impedance of
< 0.01
W
. In this application, the stable 3.3 V from U1 is applied
to U2 through a noise filter, R1–C1. U2 replicates the U1
voltage within a few millivolts, but at a higher current output at
V
OUT1
, with the ability to both sink and source output current(s)
—unlike most IC references. R2 and C2 in the feedback path of
U2 provide additional noise filtering.
Transient performance of the reference/regulator for a 100 mA
step change in load current is also quite good and is largely
determined by the R5–C5 output network. With values as
shown, the transient is about 20 mV peak and settles to within
2 mV in less than 10
m
s for either polarity. Although room exists
for optimizing the transient response, any changes to the R5–C5
network should be verified by experiment to preclude the possi-
bility of excessive ringing with some capacitor types.
To scale V
OUT2
to another (higher) output level, the optional
resistor R3 (shown dotted) is added, causing, the new V
OUT1
to
become:
V
OUT
1
=
V
OUT
2
￥
1
+
R
2
R
3
ê
ˉ
The circuit can either be used as shown, as a 5 V to 3.3 V
reference/regulator, or with ON/OFF control. By driving Pin 3
of U1 with a logic control signal as noted, the output is switched
ON/OFF. Note that when ON/OFF control is used, resistor R4
must be used with U1 to speed ON-OFF switching.
A Single-Supply, Balanced Line Driver
The circuit in Figure 39 is a unique line driver circuit topology
used in professional audio applications and has been modified
for automotive and multimedia audio applications. On a single
5 V supply, the line driver exhibits less than 0.7% distortion into
a 600
W
load from 20 Hz to 15 kHz (not shown) with an input
signal level of 4 V p-p. In fact, the output drive capability of the
AD8531/AD8532/AD8534 maintains this level for loads as
small as 32
W
. For input signals less than 1 V p-p, the THD is
less than 0.1%, regardless of load. The design is a transformer-
less, balanced transmission system where output common-mode
rejection of noise is of paramount importance. As with the
transformer-based system, either output can be shorted to
ground for unbalanced line driver applications without changing
the circuit gain of 1. Other circuit gains can be set according to
the equation in the diagram. This allows the design to be easily
configured for inverting, noninverting or differential operation.
R
L
600
C1
22 F
A2
7
6
5
3
1
2
A1
5V
R1
10k
R2
10k
R11
10k
R7
10k
6
7
5
A1
12V
5V
R8
100k
R9
100k
C2
1 F
R12
10k
R14
50
A2
1
2
3
R3
10k
R6
10k
R13
10k
C3
47 F
V
O1
V
O2
C4
47 F
A1, A2 = 1/2 AD8532
GAIN =R2
SET: R7, R10, R11 = R2
SET: R6, R12, R13 = R3
V
IN
R10
10k
R5
50
Figure 39. A Single-Supply, Balanced Line Driver for
Multimedia and Automotive Applications
相关PDF资料 |
PDF描述 |
|---|---|
| AD8531 | Low Cost, 250 mA Output Single-Supply Amplifiers(低成本,250mA输出,单电源放大器) |
| AD8532 | Low Cost, 250 mA Output Single-Supply Amplifiers(低成本,250mA输出,单电源双放大器) |
| AD8534 | Low Cost, 250 mA Output Single-Supply Amplifiers(低成本,250mA输出,单电源四放大器) |
| AD8538_07 | Low Power, Precision, Auto-Zero Op Amps |
| AD8539 | Low Power, Precision, Auto-Zero Op Amps |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:160 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:10 V/µs 增益带宽积:9MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:250µV 电流 - 电源:730µA 电流 - 输出 / 通道:28mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:管件 |
| AD8531ARTZ-REEL7 | 功能描述:IC OPAMP GP R-R CMOS SOT23-5 RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 特色产品:CMOS Operational Amplifier 标准包装:2,500 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:1000µV 电流 - 电源:900µA 电流 - 输出 / 通道:1mA 电压 - 电源，单路/双路(±):5 V ~ 14.5 V，±2.5 V ~ 7.25 V 工作温度:-40°C ~ 105°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.173"，4.40mm 宽） 供应商设备封装:8-SOP 包装:带卷 (TR) 产品目录页面:1372 (CN2011-ZH PDF) 其它名称:BD7562SF-E2TR |
| AD8531ARTZ-REEL7 | 制造商:Analog Devices 功能描述:IC OP-AMP 3MHZ 5V/S SOT-23-5 |
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