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OP113EP View Datasheet(PDF) - Analog Devices

Part Name
Description
Manufacturer
OP113EP Datasheet PDF : 16 Pages
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OP113/OP213/OP413
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.
R1
5k
R2
5k
VS+ = +5V +12V
R3
2.5k
C1
0.1F
8
2
1/2 OP113 1
3
4
R4
100
+
C2
1F
VS+ OUTPUT
2
Figure 6. False Ground Generator
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.
+5V
2
IN
OUT 6
REF43
GND
4
10F
+
10k
10k
+5V
8
2
1/2 OP113 1
OUTPUT
+2.500V
3
+
C2
10F
4
3V p-p NOISE
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.
+5V SUPPLY
AD1868
1 VL 18-BIT
LL DAC
2
VBL
16
15
3
18-BIT
DL SERIAL
REG.
4 CK
DR
5
18-BIT
LR SERIAL
6
REG.
7 DGND
18-BIT
DAC
8
VBR
14
VOL
VREF
13
AGND 12
VREF
11
VOR
10
VS 9
7.68k9.76k
330pF
7.68k9.76k
330pF
8
220F
LEFT
1/2 OP213 1
+–
CHANNEL
OUTPUT
47k
100pF
7.68k
7.68k
100pF
6
220F RIGHT
1/2 OP213 7 + –
CHANNEL
OUTPUT
5
47k
Figure 8. +5 V Only 18-Bit Stereo DAC
SoundPort is a registered trademark of Analog Devices, Inc.
REV. C
–7–
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