参数资料
型号: AD8614ART-REEL7
厂商: Analog Devices Inc
文件页数: 4/16页
文件大小: 0K
描述: IC OPAMP GP R-R 5.5MHZ SOT23-5
标准包装: 1
放大器类型: 通用
电路数: 1
输出类型: 满摆幅
转换速率: 7.5 V/µs
增益带宽积: 5.5MHz
电流 - 输入偏压: 80nA
电压 - 输入偏移: 1000µV
电流 - 电源: 800µA
电流 - 输出 / 通道: 70mA
电压 - 电源,单路/双路(±): 5 V ~ 18 V
工作温度: -20°C ~ 85°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
供应商设备封装: SOT-23-5
包装: 剪切带 (CT)
其它名称: AD8614ART-REEL7CT
AD8614/AD8644
Rev. B | Page 12 of 16
If gain is required from the output amplifier, four additional
resistors should be added as shown in Figure 31.
U1-A
4
5V
1
10
2
3
5
AVDD1
AVDD2
LINE_OUT_L
AD1881A
(AC'97)
LINE_OUT_R
AVSS1
7
8
6
9
U1-B
U1 = AD8644
VREF
38
35
27
36
26
25
+
AV
= +6dB WITH VALUES SHOWN
R6
R5
=
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY.
R6
20k
R5
10k
C1
100F
R3
20
R1
2k
R4
20
R2
2k
C2
100F
R5
10k
R6
20k
0
64
85-
03
1
Figure 31. A PC-99-Compliant Headphone/Speaker Amplifier with Gain
The gain of the AD8644 can be set as
5
6
R
A
V =
Input coupling capacitors are not required for either circuit as
the reference voltage is supplied from the AD1881A.
The resistors R4 and R5 help protect the AD8644 output in case
the output jack or headphone wires are accidentally shorted to
ground. The output coupling capacitors C1 and C2 block dc
current from the headphones and create a high-pass filter with a
corner frequency of
()
L
R
R4
C1
f
+
π
=
2
1
dB
3
where RL is the resistance of the headphones.
The remaining two amplifiers can be used as low voltage
microphone preamplifiers. A single AD8614 can be used as a
standalone microphone preamplifier. Figure 32 shows this
implementation.
10k
21
MIC1
1k
2.2k
5V
MIC 1
MIC 2
22
MIC2
27
+
VREF
AD1881A
(AC'97)
AV = 20dB
2.2k
10k
1F
1k
1F
06
485
-032
Figure 32. Microphone Preamplifier
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