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參數(shù)資料
| 型號： | THAT1243 |
| 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)： | 4/8頁 |
| 文件大?。?/td> | 111K |
| 代理商： | THAT1243 |
Application Notes
The THAT 1240, 1243, and 1246 are precision
differential amplifiers with gains of zero, -3 and -6 dB
respectively, and are primarily intended as balanced
line receivers for pro audio. However, their topology
lends itself to other applications as well.
Figures 3 and 4 show the THAT 1240 and
THAT 1246 configured as zero and -6 dB line receiv-
ers respectively. These devices can be used to retrofit
circuits currently using the SSM 2141, INA134,
SSM2143, or INA137.
While the THAT 1240 and
THAT 1246 are form, fit and functionally compatible
with their competitors’ equivalent versions, their slew
rate and bandwidth are superior.
Like other amplifiers of this type, all of THAT
Corporation’s line receivers can accept common
mode voltages that exceed the power supply rails.
Consider Figure
2. Assume that the circuit is con-
figured as shown, but with no differential excitation.
In+ and In- are shorted together, as are Vout and
Sense. Ref is tied to ground.
a
and
b
will be held at
the same voltage by feedback.
The maximum voltage allowed at the internal
node
a
is V
CC
minus 2V, while the minimum voltage is
V
EE
plus 2V. The voltage at
a
can be calculated
a
V
PK CM
[
]
R4
R3 R4
Isolating V
PK-CM
, we see that
V
a
PK CM
R
R
4
R
[
]
4
3
Thus, the maximum input in dBu would be
V
IN
dbu
Vcc
V
R
R
4
R
max
.
log
(
)
[
]
20
2
2
4
3
0775
With ±18V supplies, the THAT 1240 can tolerate
a maximum common mode input of 29.3 dBu. Un-
der the same conditions, the THAT1243 can tolerate
30.0 dBu and the THAT 1246 can tolerate 32.9 dBu.
These numbers are slightly higher than the datasheet
specifications, since they’re calculated with a slightly
higher supply voltage. Also note that high levels of
common mode input compromise the maximum dif-
ferential mode signal that can be handled
ICs.
by these
Figure 5 shows a THAT 1240 configured as a pre-
cision summing amplifier. This circuit uses both the
In+ and Ref pins as inputs. Refering to Figure 2, it
can be shown by superposition that the voltage at
a
will be
a
In
(
R
R
4
R
R
R
4
R
R
)[
]
[
]
4
3
3
3
ef
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 4
Balanced Line Receiver ICs
Preliminary Information
Vout
6
In+
3
In-
2
U1
1240
Hi
Lo
Hi - Lo
Sense
Ref
1
5
Figure 3. Zero dB line receiver
Vout
6
In+
3
In-
2
U1
1246
Hi
Lo
( Hi - Lo ) * 0.5
Sense
Ref
1
5
Figure 4. -6 dB line receiver
Vout
6
In+
3
In-
2
U1
1240
In+
Ref
(In+)+ Ref
Sense
Ref
1
5
Figure 5. Precision summing circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| THAT1246S08-U | 制造商:THAT CORPORATION 功能描述:LINE RECEIVER BALANCED 1246 SO-8 制造商:THAT CORPORATION 功能描述:LINE RECEIVER, BALANCED, 1246, SO-8 制造商:THAT CORPORATION 功能描述:LINE RECEIVER, BALANCED, 1246, SO-8; Device Type:Differential; Supply Voltage Min:6V; Supply Voltage Max:36V; Driver Case Style:SOIC; No. of Pins:8; Operating Temperature Min:0C; Operating Temperature Max:85C; Bandwidth:8.6MHz; ;RoHS Compliant: Yes |
| THAT140 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Quad Low-Noise NPN / PNP Transistor Array |
| THAT1420 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Balanced Line Drivers |
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