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參數(shù)資料
| 型號： | SSM2019BRWZRL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/10頁 |
| 文件大小： | 0K |
| 描述： | IC PREAMP AUDIO MONO AB 16SOIC |
| 標準包裝： | 1,000 |
| 類型： | AB 類 |
| 輸出類型： | 1-通道（單聲道） |
| 電源電壓： | 10 V ~ 36 V，±5 V ~ 18 V |
| 特點： | 差分輸入 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 16-SOIC W |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 包裝： | 帶卷 (TR) |
REV.
–8–
PRINTED
IN
U.S.A.
SSM2019
BUS SUMMING AMPLIFIER
In addition to its use as a microphone preamplifier, the SSM2019
can be used as a very low noise summing amplifier. Such a circuit
is particularly useful when many medium impedance outputs
are summed together to produce a high effective noise gain.
The principle of the summing amplifier is to ground the SSM2019
inputs. Under these conditions, Pins 1 and 8 are ac virtual grounds
sitting about 0.55 V below ground. To remove the 0.55 V offset,
the circuit of Figure 5 is recommended.
A2 forms a “servo” amplifier feeding the SSM2019 inputs. This
places Pins l and 8 at a true dc virtual ground. R4 in conjunction
with C2 removes the voltage noise of A2, and in fact just about
any operational amplifier will work well here since it is removed
from the signal path. If the dc offset at Pins l and 8 is not too
critical, then the servo loop can be replaced by the diode biasing
scheme of Figure 5. If ac coupling is used throughout, then Pins 2
and 3 may be directly grounded.
–
IN
VOUT
SSM2019
R4
5.1k
R3
33k
C1
0.33 F
R2
6.2k
C2
200 F
+
IN
A2
R5
10k
V
IN4148
TO PINS
2 AND 3
Figure 5. Bus Summing Amplifier
A
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