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參數(shù)資料
| 型號(hào)： | AD8529AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 8 MHz Rail-to-Rail Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, 1100 uV OFFSET-MAX, 8 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 123K |
| 代理商： | AD8529AR |
AD8519/AD8529
–9–
REV. A
500mV
50
m
s
V
=
6
2.5V
AVCC = 1
T
A
= +25
8
C
C
L
= 100pF
Figure 19. Large Signal Transient Response
APPLICATIONS INFORMATION
Maximum Power Dissipation
The maximum power that can be safely dissipated by the AD8519/
AD8529 is limited by the associated rise in junction temperature.
The maximum safe junction temperature is +150
°
C for these
plastic packages. If this maximum is momentarily exceeded, proper
circuit operation will be restored as soon as the die temperature is
reduced. Operating the product in the “overheated” condition for
an extended period can result in permanent damage to the device.
Precision Full-Wave Rectifier
Slew Rate is probably the most underestimated parameter when
designing a precision rectifier. Yet without a good slew rate
large glitches will be generated during the period when both
diodes are off.
Let’s examine the operation of the basic circuit before consider-
ing slew rate further, U1 is set up to have two states of opera-
tion. D1 and D2 diodes switch the output between the two
states. State one is as an inverter with a gain of 1 and state two
is a simple unity gain buffer where the output is equal to the
value of the virtual ground. The virtual ground is the potential
present at the noninverting node of the U1. State one is active
when V
IN
is larger than the virtual ground. D2 is on in this
condition. If V
IN
drops below virtual ground, D2 turns off and
D1 turns on. This causes the output of U1 to simply buffer the
virtual ground and this configuration is state two. So, the func-
tion of U1, which results from these two states of operation, is a
half-wave inverter. The U2 function takes the inverted half-wave
at a gain of two and sums it into the original V
IN
wave, which
outputs a rectified full-wave.
V
V
V
OUT
IN
IN
=
<
2
0
1
AD8519
D1
1N914
R6
5k
V
R1
10k
V
V
IN
R4
10k
V
R2
10k
V
D2
1N914
R3
4.99k
V
R5
10k
V
V
OUT
R7
3.32k
V
AD8519
U2
U1
VIRTUAL GROUND =
V
CC
2
NODE A
Figure 20. Precision Full-Wave Rectifier
This type of rectifier can be very precise if the following electri-
cal parameters are adhered to: First, all passive components
should be of tight tolerance, 1% resistors and 5% capacitors.
Second, if the application circuit requires high impedance (i.e.,
direct sensor interface), then an FET amplifier is probably a
better choice than the AD8519. Third, an amp such as the
AD8519, which has a great slew rate specification, will yield the
best result, because the circuit involves switching. Switching
glitches are caused when D1 and D2 are both momentarily off.
This condition occurs every time the input signal is equal to the
virtual ground potential. When this condition occurs the U1
stage is taken out of the V
OUT
equation and V
OUT
is equal to
V
IN
3
R5
3
(R4
i
R1+R2+R3). Please note: node A should be
V
IN
inverted or virtual ground, but in this condition node A is a
simply tracking V
IN
. Given a sine wave input centered around
virtual ground glitches are generated at the sharp negative peaks
of the rectified sine wave. If the glitches are hard to notice on an
oscilloscope, then raise the frequency of the sine wave till they
become apparent. The size of the glitches are proportional to
the input frequency, the diode turn-on potential (+0.2 V or
+0.65 V) and the slew rate of the op amp.
R6 and R7 are both necessary to limit the amount of bias cur-
rent related voltage offset. Unfortunately, there is no “perfect”
value for R6 because the impedance at the inverting node is
altered as D1 and D2 switch. Therefore, there will also be some
unresolved bias current related offset. To minimize this offset,
use lower value resistors or choose an FET amplifier if the opti-
mized offset is still intolerable.
The AD8519 offers a unique combination of speed vs. power
ratio at +2.7 V single supply, small size (SOT-23), and low
noise that make it an ideal choice for most high volume and
high precision rectifier circuits.
10
3
Microphone Preamp, Meets PC99 Specifications
This circuit, while lacking a unique topology, is anything but
featureless when an AD8519 is used as the op amp. This preamp
gives 20 dB gain over a frequency range of 20 Hz to 20 kHz and is
fully PC99 compliant in all parameters including THD+N, dy-
namic range, frequency range, amplitude range, crosstalk, etc.
Not only does this preamp comply with the PC99 spec it far sur-
passes it. In fact, this preamp has a V
OUT
noise of around
100 dB, which is suitable for most professional 20-bit audio
systems. Referred to input noise is 120 dB. At 120 dB THD+N
in unity gain the AD8519 is suitable for all 24-bit professional
audio systems available today. In other words, the AD8519 will
not be the limiting performance factor in your audio system de-
spite its small size and low cost.
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| AD8529ARM | 8 MHz Rail-to-Rail Operational Amplifiers |
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| AD8529 | 8 MHz Rail-to-Rail Operational Amplifiers(滿幅度運(yùn)放) |
| AD8522AN | +5 Volt, Serial Input, Dual 12-Bit DAC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8529ARM | 制造商:Analog Devices 功能描述: |
| AD8529ARM-REEL | 功能描述:IC OPAMP GP R-R 8MHZ DUAL 8MSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
| AD8529ARMZ | 制造商:Analog Devices 功能描述:- Tape and Reel |
| AD8529ARMZ-REEL | 功能描述:IC OPAMP GP R-R 8MHZ DUAL 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
| AD8529AR-REEL | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R O/P |
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