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OP113 Fiches technique(PDF) 7 Page - Analog Devices

No de pièce OP113
Description  Low Noise, Low Drift Single-Supply Operational Amplifiers
PDF  16 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

OP113 Fiches technique(HTML) 7 Page - Analog Devices

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OP113/OP213/OP413
REV. C
–7–
Supply Splitter Circuit
The OP113 family has excellent frequency response characteris-
tic that makes it an ideal pseudo-ground reference generator as
shown in Figure 6. The OP113 family serves as a voltage fol-
lower buffer. In addition, it drives a large capacitor that serves
as a charge reservoir to minimize transient load changes, as well
as a low impedance output device at high frequencies. The
circuit easily supplies 25 mA load current with good settling
characteristics.
8
1
4
3
2
1/2 OP113
R3
2.5k
C1
0.1 F
R4
100
C2
1 F
R1
5k
R2
5k
VS+ = +5V
+12V
VS+
2
OUTPUT
+
Figure 6. False Ground Generator
SoundPort is a registered trademark of Analog Devices, Inc.
Low Noise Voltage Reference
Few reference devices combine low noise and high output drive
capabilities. Figure 7 shows the OP113 family used as a two-
pole active filter that band limits the noise of the 2.500 V refer-
ence. Total noise measures 3
µV p-p.
8
1
4
3
2
1/2 OP113
10 F
C2
10 F
+5V
–
+
OUTPUT
+2.500V
3 V p-p NOISE
+
10k
10k
6
2
+5V
IN
OUT
4
GND
REF43
Figure 7. Low Noise Voltage Reference
+5 V Only Stereo DAC for Multimedia
The OP113 family’s low noise and single supply capability are
ideally suited for stereo DAC audio reproduction or sound
synthesis applications such as multimedia systems. Figure 8
shows an 18-bit stereo DAC output setup that is powered from a
single +5 volt supply. The low noise preserves the 18-bit dynamic
range of the AD1868. For DACs that operate on dual supplies,
the OP113 family can also be powered from the same supplies.
18-BIT
DAC
18-BIT
SERIAL
REG.
18-BIT
SERIAL
REG.
18-BIT
DAC
VREF
VREF
AGND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VL
LL
DL
CK
DR
LR
DGND
VBR
VS
VOR
VOL
VBL
AD1868
8
1
1/2 OP213
LEFT
CHANNEL
OUTPUT
47k
220 F
+ –
100pF
7.68k
7.68k
1/2 OP213
7.68k
7.68k
330pF
9.76k
330pF
9.76k
6
5
7
100pF
RIGHT
CHANNEL
OUTPUT
47k
220 F
+ –
+5V SUPPLY
Figure 8. +5 V Only 18-Bit Stereo DAC



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