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參數(shù)資料
| 型號： | OP183GSZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 5MHZ LN 50MA 8SOIC |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標準包裝： | 2,500 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 15 V/µs |
| 增益帶寬積： | 5MHz |
| 電流 - 輸入偏壓： | 300nA |
| 電壓 - 輸入偏移： | 10µV |
| 電流 - 電源： | 1.2mA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 36 V，±1.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
OP183
Rev. D | Page 14 of 16
LOW VOLTAGE HEADPHONE AMPLIFIERS
Figure 36 shows a stereo headphone output amplifier for the
AD1849 16-bit SoundPort Stereo Codec device. The
pseudoreference voltage is derived from the common-mode
voltage generated internally by the AD1849, thus providing a
convenient bias for the headphone output amplifiers.
00292-036
OP183
5V
5k
Ω
OPTIONAL
GAIN
1k
Ω
VREF
L VOLUME
CONTROL
16
Ω 220μF
47k
Ω
HEADPHONE
LEFT
5V
R VOLUME
CONTROL
5k
Ω
OPTIONAL
GAIN
1k
Ω
VREF
16
Ω 220μF
47k
Ω
HEADPHONE
RIGHT
AD1849
20
19
21
LOUT1L
LOUT1R
CMOUT
VREF
10
μF
10k
Ω
10k
Ω
10
μF
Figure 36. Headphone Output Amplifier for Multimedia Sound Codec
LOW NOISE MICROPHONE AMPLIFIER FOR
MULTIMEDIA
The OP183 is ideally suited as a low noise microphone preamp
for low voltage audio applications. Figure 37 shows a gain of 100
stereo preamp for the AD1849 16-bit SoundPort Stereo Codec
chip. The common-mode output buffer serves as a phantom
power driver for the microphones.
00292-
037
OP183
5V
10k
Ω
10k
Ω
AD1849
18
19
17
MINL
MINR
CMOUT
1/2
OP219
5V
100
Ω
100
Ω
10k
Ω
10k
Ω
50
Ω
10
μF
50
Ω
10
μF
20
Ω
20
Ω
RIGHT
ELECTRET
CONDENSER
MIC
INPUT
LEFT
ELECTRET
CONDENSER
MIC
INPUT
Figure 37. Low Noise Stereo Microphone Amplifier for
Multimedia Sound Codec
3 V 50 HZ/60 HZ ACTIVE NOTCH FILTER WITH
FALSE GROUND
To process ac signals, it may be easier to use a false-ground bias
rather than the negative supply as a reference ground. This
would reject the power line frequency interference which can
often obscure low frequency physiological signals, such as heart
rates, blood pressures, EEGs, and ECGs.
Figure 38 shows a 50 Hz/60 Hz active notch filter for
eliminating line noise in patient monitoring equipment. It has
several kilohertz bandwidth and is not sensitive to false-ground
perturbations. The simple false-ground circuit shown achieves
good rejection of low frequency interference using standard off-
the-shelf components.
4
5
3
1
2
A1
8
7
6
OP183
4
1
3
A3
R1
2.67k
Ω
3V
C1
1
μF
R3
2.67k
Ω
C2
1
μF
R4
2.67k
Ω
R2
2.67k
Ω
R5
1.33k
Ω
(2.67k
Ω÷ 2)
C3
1
μF
(1
μF × 2)
R8
1k
Ω
R7
1k
Ω
C5
0.015
μF
R12
70
Ω
R11
10k
Ω
0.75V
C6
1
μF
R10
25k
Ω
C4
1
μF
R9
75k
Ω
3V
VIN
R6
10k
Ω
VO
00292-038
A2
OP183
Q = 0.75
NOTE:
FOR 50Hz APPLICATIONS
CHANGE R1–R4 TO 3.1
Ω
AND R5 TO 1.58
Ω (3.16Ω÷ 2).
Figure 38. 3 V Supply 50 Hz/60 Hz Notch Filter with Pseudo Ground
Amplifier A3 biases A1 and A2 to the middle of their input
common-mode range. When operating on a 3 V supply, the
center of the common-mode range of the OP183 is 0.75 V. This
notch filter effectively squelches 60 Hz pickup at a filter Q of
0.75. To reject 50 Hz interference, change the resistors in the
twin-T section (R1 through R5) from 2.67 kΩ to 3.16 kΩ.
The filter section uses OP183 op amps in a twin-T
configuration whose frequency selectivity is very sensitive to
the relative matching of the capacitors and resistors in the twin-
T section. Mylar is the material of choice for the capacitors, and
the relative matching of the capacitors and resistors determines
the filter’s pass-band symmetry. Using 1% resistors and 5%
capacitors produces satisfactory results.
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