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PDF THAT1243 Data sheet ( Hoja de datos )

Número de pieza THAT1243
Descripción (THAT1240 / THAT1243 / THAT1246) Balanced Line Receiver ICs
Fabricantes ETC 
Logotipo ETC Logotipo



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T H AT Corporation
FEATURES
· High CMRR: typically 90dB at 60Hz
· Wide bandwidth and high slew rate
· Low distortion and low noise
· Available in 0 dB, -3 dB, and -6 dB
versions
· Pin compatible with SSM2143 and
INA137
Balanced Line Receiver ICs
THAT 1240, 1243, 1246
APPLICATIONS
· Balanced Audio Line Receivers
· Summing Amplifiers
· Differential Amplifiers
· Current Shunt Monitors
· Ground Loop Eliminator
Description
The THAT 124x series of precision differential
amplifiers are designed primarily for use as audio
balanced line receivers. Gains of 0 db, -3 dB, and
-6 dB are available to suit various applications re-
quirements.
The THAT 1246 is drop-in compatible with
the Burr-Brown INA137 and Analog Devices
SSM2143, while the THAT 1240 is drop-in com-
patible with the SSM2140.
All devices exhibit 90 dB of typical com-
mon-mode rejection, slew rates of 12 V/ms, a
20MHz bandwidth, and 0.0006% THD. Both sur-
face-mount and DIP packages are available.
The THAT 124x family are laser-trimmed to
obtain the precision resistor matching needed for
high CMR performance. Fashioned in THAT Cor-
poration's proprietary dielectric isolation (DI)
process, the THAT 124x series provides the sonic
benefit of discrete designs, with the compact size,
reliability, matching, and thermal tracking of a
fully integrated solution.
Vcc
In- Sense
Vout
In+ Ref
Vee NC
Figure 1. THAT1240-series equivalent circuit diagram
Pin Name
Ref
In-
In+
Vee
Sense
Vout
Vcc
NC
DIP Pin
1
2
3
4
5
6
7
8
SO Pin
1
2
3
4
5
6
7
8
Table 1. 1240 Series pin assignments
Gain Plastic DIP Plastic SO
0 dB
1240P
1240S
-3 dB
1243P
1243S
-6 dB
1246P
1246S
Table 2. Ordering information
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com

1 page




THAT1243 pdf
Rev. 04/29/02
Preliminary Information
Page 5
In Hi
+24 dBu In
In Lo
2
In-
5
Sense
6
Vout
3 Ref
In+ U1
R8
2k10
1 THAT
1246
+24 dBu
C4
6n8
AIN- to ADC
R9 Zero dBu Out
249R
2
In-
5
Sense
6
Vout
3 Ref
In+
1
U2
THAT
1246
R19
2k10
U3A 3 1/2 Vref of ADC
1
2
AIN+ to ADC
4570
Figure 6. Circuit for audio ADCs with balanced inputs
Since R3=R4 in the THAT 1240, this equation
can be simplified to
a
=
( In +) + Ref
2
The output voltage would then be
Vout = a ´(1 + RR12)
Since R2=R1, combining equations results in
Vout = (In+) + Ref
Figure 6 shows a convenient method of driving a
typical audio ADC with balanced inputs. This circuit
accepts +24 dBu in, and using a pair of
THAT 1246s, the signal level between their respective
outputs is +24 dBu. An attenuator network brings
the signal down another 24 dB while attenuating the
noise of the line receivers as well.
The output noise of a THAT 1246 is -109 dBu,
and since there are two of them, the total noise level
going into the resistive pad will be -106 dBu. The
pad reduces the noise level to -130 dBu at the input
to the ADC. The noise density resulting from the line
receivers will therefore be
-3dB
In Lo 2
In-
5
Sense
6
Vout
In Hi 3
Ref
In+ 1 U1
1243
-3dB
C3
U3
2180B
2 VCC
C2
R2
1
EC+ 4
SYM
7
V+
8
IN OUT
22u 20k0
V-
GND
EC- 6
5
3 R4
5k1
Control Voltage
VEE
22p
R3
14k0
21
3
U4A
4570
+6dB
C1
VCC
100n
6
4 InVccCap27Out+8
3 Gnd
Out-
Cap1
Vee 2
5
1
VEE
U2
THAT1430
R1
1M0
Out Hi
Out Lo
Figure 7. Automated gain control of a balanced signal
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com

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