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參數(shù)資料
| 型號： | THAT1240 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Balanced Line Receiver ICs |
| 中文描述： | 平衡線接收器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 111K |
| 代理商： | THAT1240 |
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com
Page 6
Balanced Line Receiver ICs
Preliminary Information
e
n line receiver
kHz
nV
Hz
dBu
20
10
0775
,
20
130
173
.
(
)
The noise of the 249
We can assume that the noise contribution of R8 and
R19 will be negligible, and therefore, the total noise
density going into the input of the ADC will be
resistor is 2.05 nV/ Hz.
e
n total
nV
Hz
nV
Hz
nV
Hz
1 73
)
(2 06
)
.
2 68
2
2
The noise floor can then be calculated to be
Noise
dB
dBu
kHz
nV
Hz
0775
.
20
126 2
268
.
20
log
.
u
Figure 7 shows an excellent method for control-
ling gain in a balanced system.
temptation in these systems to keep the signal bal-
anced and use two VCAs to independently control the
There is often a
gain on each half of the balanced signal.
nately, this can results in common mode to differen-
tial mode conversion (degradation of CMRR) when
there are even slight differences in gain between the
VCAs. A better approach is to convert the signal to
single-ended, alter the gain, and then convert back to
balanced.
Unfortu-
In Figure 7 we use a THAT 1243 -3 dB line re-
ceiver to do the balanced to single-ended conversion.
The VCA section also has a static gain of -3 dB due to
the ratio of R2 and R3.
24 dBu, since the THAT 1243 output stage is capable
of 21 dBu without distortion. Reducing R3 to 14 k
results in a 3 dB reduction in VCA output noise.
This arrangement results in 3 dB greater dynamic
range compared to the case where a -6 dB line re-
ceiver and a VCA with zero dB static gain are used.
After the VCA, the signal is restored to 24 dBu by the
THAT 1430.
This circuit can accept
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THAT1243 | Balanced Line Receiver ICs |
| THAT1246 | Balanced Line Receiver ICs |
| THAT1420 | Balanced Line Drivers |
| THAT1430 | Balanced Line Drivers |
| THAT1510 | Low Noise, High Performance Microphone Preamplifier IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THAT1240P08-U | 制造商:THAT CORPORATION 功能描述:LINE RECEIVER BALANCED 1240 DIP8 制造商:THAT CORPORATION 功能描述:LINE RECEIVER, BALANCED, 1240, DIP8 制造商:THAT CORPORATION 功能描述:LINE RECEIVER, BALANCED, 1240, DIP8; Device Type:Differential; Supply Voltage Min:6V; Supply Voltage Max:36V; Driver Case Style:DIP; No. of Pins:8; Operating Temperature Min:0C; Operating Temperature Max:85C; Bandwidth:8.6MHz; Base;RoHS Compliant: Yes |
| THAT1240S08-U | 制造商:THAT CORPORATION 功能描述:LINE RECEIVER BALANCED 1240 SO-8 |
| THAT1243 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Balanced Line Receiver ICs |
| THAT1246 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Balanced Line Receiver ICs |
| THAT1246P08-U | 制造商:THAT CORPORATION 功能描述:LINE RECEIVER BALANCED 1246 DIP8 制造商:THAT CORPORATION 功能描述:LINE RECEIVER, BALANCED, 1246, DIP8 制造商:THAT CORPORATION 功能描述:LINE RECEIVER, BALANCED, 1246, DIP8; Device Type:Differential; Supply Voltage Min:6V; Supply Voltage Max:36V; Driver Case Style:DIP; No. of Pins:8; Operating Temperature Min:0C; Operating Temperature Max:85C; Bandwidth:8.6MHz; Base;RoHS Compliant: Yes |
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