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| 型号： | ADA4841-2YRZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/21页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF R-R DUAL LP LN 8SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 电压反馈 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 13 V/µs |
| -3db带宽： | 80MHz |
| 电流 - 输入偏压： | 3µA |
| 电压 - 输入偏移： | 40µV |
| 电流 - 电源： | 1.2mA |
| 电流 - 输出 / 通道： | 60mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 12 V，±1.35 V ~ 6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
ADA4841-1/ADA4841-2
Rev. E | Page 17 of 20
APPLICATIONS INFORMATION
TYPICAL PERFORMANCE VALUES
To reduce design time and eliminate uncertainty Table 6
provides a convenient reference for typical gains, component
values, and performance parameters.
16-BIT ADC DRIVER
The combination of low noise, low power, and high speed
make the ADA4841-1/ADA4841-2 the perfect driver solution
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 50. 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.
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 49 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
μF
0.1
μF
–5V
10
μF
0.1
μF
OUTPUT
05
61
4-
04
4
C1
1320pF
R2
249
Ω
R1
249
Ω
R4
499
Ω
Figure 49. 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
2
1
C
R
fC
π
=
The quality factor, or Q, is shown in the equation
K
Q
=
3
1
For minimum peaking, set Q equal to 0.707.
The gain, or K, of the amplifier is
1
+
=
R3
R4
K
Resistor values are kept low for minimal noise contribution,
offset voltage, and optimal frequency response.
AD7685
REF
GND
VDD
IN–
IN+
VIO
SDI
SCK
SDO
CNV
100nF
10
μF
ADR364
33
Ω
2.7nF
–0.25V
0V TO 4.096V
ADA4841
100nF
+5.2V
100nF
05
61
4-
0
60
Figure 50. ADC Driver Schematic
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4841-2YRZ-RL | 功能描述:IC OPAMP VF R-R DUAL LP LN 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 放大器类型:电流检测 电路数:1 输出类型:- 转换速率:- 增益带宽积:125kHz -3db带宽:- 电流 - 输入偏压:- 电压 - 输入偏移:100µV 电流 - 电源:1.1µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:4-WFBGA，CSPBGA 供应商设备封装:4-UCSP（2x2） 包装:剪切带 (CT) 其它名称:MAX9634WERS+TCT |
| ADA4841-X | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 8-Channel, 250 kSPS PulSAR ADC |
| ADA4850-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Speed, Rail-to-Rail Output Op Amps with Ultralow Power-Down |
| ADA4850-1_07 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Speed, Rail-to-Rail Output Op Amps with Ultralow Power-Down |
| ADA4850-1YCPZ-R2 | 功能描述:IC OPAMP VF R-R 118MA 8LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
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