參數(shù)資料
型號(hào)： ADA4841-1YRZ
廠商： ANALOG DEVICES INC
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
中文描述： OP-AMP, 300 uV OFFSET-MAX, PDSO8
封裝： ROHS COMPLIANT, MS-012AA, SOIC-8
文件頁(yè)數(shù)： 17/20頁(yè)
文件大?。?/td> 442K
代理商： ADA4841-1YRZ
ADA4841-1/ADA4841-2
APPLICATIONS
TYPICAL PERFORMANCE VALUES
To reduce design time and eliminate uncertainty Table 6
provides a convenient reference for typical gains, component
values, and performance parameters.
Rev. C | Page 17 of 20
16-BIT ADC DRIVER
The combination of low noise, low power, and high speed
make the ADA4841-1/ADA4841-2 the perfect driver solution
for low power, 16-bit ADCs, such as the
AD7685
. Figure 49
shows a typical 16-bit single-supply application.
There are different challenges to a single-supply, high resolution
design, and the ADA4841-1/ADA4841-2 address these nicely.
In a single-supply system, a main challenge is using the
amplifier in buffer mode with the lowest output noise and
preserving linearity compatible with the ADC.
Rail-to-rail input amplifiers are usually higher noise than the
ADA4841-1/ADA4841-2 and cannot be used in this mode
because of the nonlinear region around the crossover point of
their input stages. The ADA4841-1/ADA4841-2, which have no
crossover region but have a wide linear input range from 100 mV
below ground to 1 V below positive rail, solve this problem, as
shown in Figure 49. The amplifier, when configured as a
follower, has a linear signal range from 0.25 V above the minus
supply voltage (limited by the amplifier’s output stage) to 1 V
below the positive supply (limited by the amplifier input stage).
A 0 V to +4.096 V signal range can be accommodated with a
positive supply as low as +5.2 V and a negative power supply of
0.25 V. The 5.2 V supply also allows the use of a small, low
dropout, low temperature drift
ADR364
reference voltage. If
ground is used as the amplifier negative supply, then note that at
the low end of the input range close to ground, the ADA4841-1/
ADA4841-2 exhibit substantial nonlinearity, as any rail-to-rail
output amplifier. The ADA4841-1/ADA4841-2 drive a one-
pole, low-pass filter. This filter limits the already very low noise
contribution from the amplifier to the
AD7685
.
AD7685
REF
GND
VDD
IN–
IN+
VIO
SDI
SCK
SDO
CNV
100nF
10
μ
F
ADR364
33
Ω
2.7nF
–0.25V
0V TO 4.096V
ADA4841
100nF
+5.2V
100nF
0
Figure 49. ADC Driver Schematic
RECONSTRUCTION FILTER
The ADA4841-1/ADA4841-2 can also be used as a reconstruction
filter at the output of DACs for suppression of the sampling
frequency. The filter shown in Figure 50 is a two-pole, 500 kHz
Sallen-Key LPF with a fixed gain of G = +1.6.
U1
C2
1320pF
R3
840
Ω
INPUT
+5V
10
μ
F
0.1
μ
F
–5V
10
μ
F
0.1
μ
F
OUTPUT
0
C1
1320pF
R2
249
Ω
R1
249
Ω
R4
499
Ω
Figure 50. Two-Pole 500 kHz Reconstruction Filter Schematic
Setting the resistors and capacitors equal to each other greatly
simplifies the design equations for the Sallen-Key filter. The
corner frequency, or 3 dB frequency, can be described by
the equation
1
1
2
1
R
C
f
C
π
=
The quality factor, or Q
,
is shown in the equation
1
K
Q
=
3
For minimum peaking, set Q equal to 0.707.
The gain, or
K,
of the amplifier is
R4
K
1
+
=
R3
Resistor values are kept low for minimal noise contribution,
offset voltage, and optimal frequency response.
相關(guān)PDF資料
PDF描述
ADA4841-1YRZ-R7 Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
ADA4841-1YRZ-RL Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
ADA4841-2YRMZ Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
ADA4841-2YRMZ-R7 Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
ADA4841-2YRMZ-RL Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADA4841-1YRZ-R7 功能描述:IC OPAMP VF R-R LP LN 60MA 8SOIC RoHS:是 類(lèi)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(lèi)型:RF/IF 差分 電路數(shù):1 輸出類(lèi)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(lèi)型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤(pán)，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(yè)面:551 (CN2011-ZH PDF) 其它名稱(chēng):ADL5561ACPZ-R7CT
ADA4841-1YRZ-R7 制造商:Analog Devices 功能描述:IC OP-AMP 80MHZ 13V/S SOIC-8
ADA4841-1YRZ-RL 功能描述:IC OPAMP VF R-R LP LN 60MA 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類(lèi)型:通用 電路數(shù):2 輸出類(lèi)型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件
ADA4841-2 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Power, Low Noise and Distortion ail-to-Rail Output Amplifiers
ADA4841-2YCPZ-R2 功能描述:IC OPAMP VF R-R LP 60MA 8LFCSP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類(lèi)型:電壓反饋 電路數(shù):4 輸出類(lèi)型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR)
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