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參數(shù)資料
| 型號(hào)： | OP213 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Noise, Low Drift Single-Supply Operational Amplifiers(低噪聲,低漂移,單電源運(yùn)算放大器) |
| 中文描述： | 低噪聲，低漂移單電源運(yùn)算放大器（低噪聲，低漂移，單電源運(yùn)算放大器） |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 438K |
| 代理商： | OP213 |
OP113/OP213/OP413
REV. B
–7–
R6 should be adjusted for a zero-volt output with the thermo-
couple measuring tip immersed in a zero-degree ice bath. When
calibrating, be sure to adjust R6 initially to cause the output to
swing in the positive direction first. T hen back off in the nega-
tive direction until the output just stops changing.
An Ultralow Noise, Single Supply Instrumentation Amplifier
Extremely low noise instrumentation amplifiers can be built
using the OP113 family. Such an amplifier that operates off a
single supply is shown in Figure 5. Resistors R1–R5 should be
of high precision and low drift type to maximize CMRR perfor-
mance. Although the two inputs are capable of operating to zero
volt, the gain of –100 configuration will limit the amplifier input
common mode to not less than 0.33 V.
1/2
OP-213
R1*
10k
R2*
2k
R3*
2k
R4*
10k
R
G
*
(200
+ 12.7
)
V
OUT
V
IN
1/2
OP-213
+5V TO +36V
*ALL RESISTORS ±0.1%, ±25PPM/
°
C
GAIN =
+ 6
20k
R
G
Figure 5. Ultralow Noise, Single Supply Instrumentation
Amplifier
Supply Splitter Circuit
T he OP113 family has excellent frequency response characteris-
tic that makes it an ideal pseudo-ground reference generator as
shown in Figure 6. T he 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. T he cir-
cuit easily supplies 25 mA load current with good settling
characteristics.
8
1
4
3
2
1/2 OP-113
R3
2.5k
C1
0.1μF
R4
100
C2
1μF
R1
5k
R2
5k
V
S
+ = +5V
→
+12V
V
S
+
2
OUTPUT
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. T otal noise measures 3
μ
V p-p.
8
1
4
3
2
1/2
OP-113
C2
10μF
10k
OUTPUT
+2.500V
+5V
3μVp-p NOISE
10μF
10k
6
2
4
IN
OUT
GND
REF-43
+5V
Figure 7. Low Noise Voltage Reference
+5 V Only Stereo DAC for Multimedia
T he OP113 family’s low noise and single supply capability are
ideally suited for stereo DAC audio reproduction or sound syn-
thesis applications such as multimedia systems. Figure 8 shows
an 18-bit stereo DAC output setup that is powered from a single
+5 volt supply. T he 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.
8
1
4
3
2
1/2 OP-213
7.68k
9.76k
330pF
100pF
7.68k
7
5
6
1/2 OP-213
7.68k
9.76k
330pF
100pF
7.68k
47k
LEFT
CHANNEL
OUTPUT
47k
RIGHT
CHANNEL
OUTPUT
220μF
220μF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AD1868
V
L
LL
DL
CK
DR
LR
DGND
VBR
VBL
VOL
AGND
VOR
V
S
+5V SUPPLY
18-BIT
SERIAL
REG.
18-BIT
SERIAL
REG.
V
REF
V
REF
18-BIT
DAC
18-BIT
DAC
Figure 8. +5 V Only 18-Bit Stereo DAC
Low Voltage Headphone Amplifiers
Figure 9 shows a stereo headphone output amplifier for the
AD1849 16-bit SoundPort Stereo Codec device. T he pseudo-
reference voltage is derived from the common-mode voltage
generated internally by the AD1849, thus providing a conve-
nient bias for the headphone output amplifiers.
SoundPort is a registered trademark of Analog Devices, Inc.
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