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AD8606ARM-REEL Datasheet(PDF) 16 Page - Analog Devices

Part No. AD8606ARM-REEL
Description  Precision Low noise CMOS Rail-to-Rail Input/Output Operational Amplifiers
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8606ARM-REEL Datasheet(HTML) 16 Page - Analog Devices

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AD8605/AD8606/AD8608
Rev. D | Page 16 of 20
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
10M
CF
10pF
Figure 51. 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 9, the output error voltage is
approximately 100 µV at room temperature, increasing to about
1 mV at 85°C.
Where ft is the unity gain frequency of the amplifier, the
maximum achievable signal bandwidth is
T
F
t
MAX
C
R
f
f
π
=
2
AUDIO AND PDA APPLICATIONS
The AD8605’s low distortion and wide dynamic range make it a
great choice for audio and PDA applications, including
microphone amplification and line output buffering.
Figure 52 shows a typical application circuit for headphone/line
out amplification.
R1 and R2 are used to bias the input voltage at half the supply.
This maximizes the signal bandwidth range. C1 and C2 are used
to ac couple the input signal. C1 and R2 form a high-pass filter
whose corner frequency is 1/2πR1C1.
The high output current of the AD8605 allows it to drive heavy
resistive loads.
The circuit of Figure 52 was tested to drive a 16 W 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
1
µF
R1
10k
R2
10k
V1
500mV
1/2
AD8606
C3
100
µF
R4
20
R3
1k
1/2
AD8606
C4
100
µF
R6
20
R5
1k
C2
1
µF
V2
500mV
Figure 52. Single-Supply Headphone/Speaker Amplifier


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