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AD8606ARMZ-R7 数据表(PDF) 19 Page - Analog Devices

部件名 AD8606ARMZ-R7
功能描述  Precision, Low Noise, CMOS, Rail-to-Rail, Input/Output Operational Amplifiers
PDF  24 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8606ARMZ-R7 数据表(HTML) 19 Page - Analog Devices

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Data Sheet
AD8605/AD8606/AD8608
Rev. N | Page 19 of 24
I-V CONVERSION APPLICATIONS
PHOTODIODE PREAMPLIFIER APPLICATIONS
The low offset voltage and input current of the AD8605 make
it an excellent choice for photodiode applications. In addition,
the low voltage and current noise make the amplifier ideal for
application circuits with high sensitivity.
RD
ID
CD
50pF
AD8605
VOUT
PHOTODIODE
VOS
RF
10MΩ
CF
10pF
Figure 52. Equivalent Circuit for Photodiode Preamp
The input bias current of the amplifier contributes an error
term that is proportional to the value of RF.
The offset voltage causes a dark current induced by the shunt
resistance of the Diode RD. These error terms are combined at
the output of the amplifier. The error voltage is written as
B
F
D
F
OS
O
I
R
R
R
V
E
+


+
=
1
Typically, RF is smaller than RD, thus RF/RD can be ignored.
At room temperature, the AD8605 has an input bias current of
0.2 pA and an offset voltage of 100 µV. Typical values of RD are
in the range of 1 GΩ.
For the circuit shown in Figure 52, the output error voltage is
approximately 100 µV at room temperature, increasing to about
1 mV at 85°C.
The maximum achievable signal bandwidth is
F
F
t
MAX
C
R
f
f
π
2
=
where ft is the unity gain frequency of the amplifier.
AUDIO AND PDA APPLICATIONS
The low distortion and wide dynamic range of the AD860x
make it a great choice for audio and PDA applications,
including microphone amplification and line output buffering.
Figure 53 shows a typical application circuit for headphone/
line-out amplification.
R1 and R2 are used to bias the input voltage at half the supply,
which maximizes the signal bandwidth range. C1 and C2 are
used to ac couple the input signal. C1, R1, and R2 form a high-
pass filter whose corner frequency is 1/[2π(R1||R2)C1].
The high output current of the AD8606 allows it to drive heavy
resistive loads.
The circuit in Figure 53 is tested to drive a 16 Ω headphone. The
THD + N is maintained at approximately −60 dB throughout the
audio range.
5V
4
2
3
8
1
HEADPHONES
5V
4
6
5
8
7
C1
1µF
V1
500mV
1/2
AD8606
C3
100µF
1/2
AD8606
C4
100µF
C2
1µF
V2
500mV
R1
20kΩ
R2
20kΩ
R7
20kΩ
R8
20kΩ
R4
20Ω
R3
1kΩ
R6
20Ω
R5
1kΩ
Figure 53. Single-Supply Headphone/Speaker Amplifier



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