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| 型号： | ADA4638-1ARZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/25页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP RRO ZERO DRIFT 8SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 零漂移 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 1.5 V/µs |
| 增益带宽积： | 1.5MHz |
| -3db带宽： | 2.5MHz |
| 电流 - 输入偏压： | 45pA |
| 电压 - 输入偏移： | 0.5µV |
| 电流 - 电源： | 850µA |
| 电流 - 输出 / 通道： | 38mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 30 V，±2.25 V ~ 15 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) |
ADA4638-1
Data Sheet
Rev. 0 | Page 18 of 24
1007
2-
158
TIME (2s/DIV)
V
O
L
T
A
GE
(
10
V
/D
IV
)
VSY = ±15V
VOUT
RL =10k
VIN
Figure 58. No Phase Reversal
NOISE CONSIDERATIONS
1/f Noise
1/f noise, also known as pink noise or flicker noise, is inherent
in semiconductor devices and increases as frequency decreases.
At low frequency, 1/f noise is a major noise contributor and
causes a significant output voltage offset when amplified by the
noise gain of the circuit. However, the ADA4638-1 eliminates
the 1/f noise internally, thus making it an excellent choice for dc
or low frequency high precision applications. The 0.1 Hz to
10 Hz voltage noise is only 1.2 μV p-p at ±15 V of supply voltage.
The low frequency 1/f noise appears as a slow varying offset to
the ADA4638-1 and is greatly reduced by the combination of
auto-zeroing and chopping technique. This allows the ADA4638-1
to have a much lower noise at dc and low frequency in comparison
to standard low noise amplifiers that are susceptible to 1/f noise.
ADA4638-1 with no 1/f noise.
COMPARATOR OPERATION
Op amps are designed to operate in a closed-loop configuration
with feedback from its output to its inverting input. Figure 59
shows the ADA4638-1 configured as a voltage follower with an
input voltage, which is kept at midpoint of the power supplies.
A1 and A2 indicate the placement of ammeters to measure supply
currents. ISY+ refers to the current flowing into the positive
supply pin of the op amp, and ISY refers to the current flowing
out of the negative supply pin of the op amp. From Figure 60, as
expected in normal operating condition, the current flowing
into the op amp is equivalent to the current flowing out of the op
amp, where ISY+ = ISY.
ADA4638-1
A1
100k
ISY+
+VSY
VOUT
–VSY
ISY–
A2
10
07
2-
0
59
Figure 59. Voltage Follower
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
0
5
10
15
20
25
30
I SY
PE
R
A
M
PL
IF
IE
R
(
m
A
)
VSY (V)
ISY+
ISY–
100
72
-06
0
Figure 60. Supply Current vs. Supply Voltage (Voltage Follower)
In contrast to op amps, comparators are designed to work in an
open-loop configuration and to drive logic circuits. Although
op amps are different from comparators, occasionally an unused
section of a dual op amp is used as a comparator to save board
space and cost; however, this is not recommended.
a comparator, with resistors RIN1 and RIN2 in series with the
input pins.
ADA4638-1
A3
ITOTAL+
A1
ISY+
RIN1
+VSY
VOUT
–VSY
IINPUT+
RIN2
IINPUT–
A2
ISY–
A4
ITOTAL–
100
72-
06
1
Figure 61. Comparator A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4638-1ARZ-RL | 功能描述:IC OPAMP RRO ZERO DRIFT 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
| ADA-4643 | 制造商:Avago Technologies 功能描述:AMP RF SI 4643 SOT-343-4 3.5V 制造商:Avago Technologies 功能描述:AMP, RF SI, 4643, SOT-343-4, 3.5V |
| ADA-4643-BLK | 制造商:AGILENT 制造商全称:AGILENT 功能描述:Silicon Bipolar Darlington Amplifier |
| ADA-4643-BLKG | 功能描述:射频放大器 DC - 2.5 GHz 17 dB RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel |
| ADA-4643-TR1 | 功能描述:IC AMP DARL BIPOL 2.5GHZ SOT-343 RoHS:否 类别:RF/IF 和 RFID >> RF 放大器 系列:- 标准包装:3,000 系列:- 频率:100MHz ~ 6GHz P1dB:9.14dBm（8.2mW） 增益:15.7dB 噪音数据:1.3dB RF 型:CDMA，TDMA，PCS 电源电压:2.7 V ~ 5 V 电流 - 电源:60mA 测试频率:2GHz 封装/外壳:0505（1412 公制） 包装:带卷 (TR) |
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