OP113_07 Datasheet, PDF (16/24 Pages) Analog Devices – Low Noise, Low Drift Single-Supply Operational Amplifiers

OP113/OP213/OP413
V_S+ = 5V 12V
R3
2.5kΩ
C1
0.1µF
R1
5kΩ
8
2–
R4
1/2
OP213 ¹
3+
4
100Ω
+
C2
1µF
V_S+
OUTPUT
2
R2
5kΩ
Figure 46. False Ground Generator
LOW NOISE VOLTAGE REFERENCE
Few reference devices combine low noise and high output drive
capabilities. Figure 47 shows the OPx13 family used as a two-
pole active filter that band limits the noise of the 2.5 V reference.
Total noise measures 3 μV p-p.
5V
2
IN
OUT 6
REF43
GND
4
–
10µF
+
10kΩ
10kΩ
5V
8
2–
1/2
OP213
3+
+
4
C2
10µF
1
OUTPUT
2.5V
3µV p-p NOISE
Figure 47. Low Noise Voltage Reference
5 V ONLY STEREO DAC FOR MULTIMEDIA
The OPx13 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 48
shows an 18-bit stereo DAC output setup that is powered from a
single 5 V supply. The low noise preserves the 18-bit dynamic
range of the AD1868. For DACs that operate on dual supplies,
the OPx13 family can also be powered from the same supplies.
5V SUPPLY
AD1868
1 V_{L 18-BIT}
LL ^DAC
2
–
+
3
18-BIT
DL SERIAL
REG.
4
CK
V_REF
V_BL
16
15
14
V_OL
13
DR
5
18-BIT
LR SERIAL
6
REG.
AGND 12
V_REF
11
7 ^DGND
18-BIT
DAC
8
V_BR
+ _VOR
–
10
V_S 9
7.68kΩ 9.76kΩ
+
330pF
7.68kΩ 9.76kΩ
+
330pF
3+ ⁸
1/2
OP213
2– ₄
220µF
LEFT
1 _+–
CHANNEL
OUTPUT
47kΩ
100pF
7.68kΩ
7.68kΩ
100pF
6–
1/2
OP213
5+
220µF _RIGHT
7 _+–
CHANNEL
OUTPUT
47kΩ
Figure 48. 5 V Only 18-Bit Stereo DAC
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