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PDF THAT1286 Data sheet ( Hoja de datos )
| Número de pieza | THAT1286 | |
| Descripción | (THAT128x) Dual Balanced Line Receiver ICs | |
| Fabricantes | THAT Corporation | |
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FEATURES
• High CMRR: typ. 90 dB at 60Hz
• Self-contained
• Excellent audio performance
– Wide bandwidth: typ. >7.6 MHz
– High slew rate: typ. 15 V/μs
– Low distortion: typ. 0.0006% THD
– Low noise: typ. -104.5 dBu
• Low current: typ. 3 mA (per amplifier)
• Several gains: 0 dB, ±3 dB, ±6 dB
• Industry Standard Pinout
Dual Balanced
Line Receiver ICs
THAT 1280, 1283, 1286
APPLICATIONS
• Balanced Audio Line Receivers
• Instrumentation Amplifiers
• Differential Amplifiers
• Precision Summers
• Current Shunt Monitors
Description
The THAT 1280 series of precision differen-
tial amplifiers was designed primarily for use as
balanced line receivers for audio applications.
Gains of 0 dB, ±3 dB, and ±6 dB are available to
suit various applications requirements.
These devices are laser-trimmed in wafer
form to obtain the precision resistor matching
needed for high CMR performance and precise
gain. Manufactured in THAT Corporation’s
proprietary complementary dielectric isolation
(DI) process, the 1280 series provides the sonic
benefits of discrete designs with the simplicity,
reliability, matching, and small size of a fully
integrated solution.
All three versions of the part typically exhibit
90 dB of common-mode rejection. With 15 V/μs
slew rate, 7.6 MHz or higher bandwidth, and
0.0006% THD, these devices are sonically trans-
parent. Moreover, current consumption is
typically a low 6 mA (3 mA per amplifier).
The 1280 series is available in a 14-pin SOIC
package. The 1280 is pin-compatible with the TI
INA2134, and the 1286 is pin-compatible with
the TI INA2137 and the ADI AD8273.
Ref A Out A Sns A Vcc Sns B Out B Ref B
14 13 12 11 10
9
8
R4
R2
R2 R4
R3
R1
R1 R3
12 34567
NC In- A In+ A Vee In+ B In- B NC
Part No.
THAT1280
THAT1283
THAT1286
Gain
0 dB
-3 dB
-6 dB
R1 & R3
R2 & R4
Figure 1. Equivalent circuit
Pin Name
N/C
IN- A
IN+ A
VEE
IN+ B
IN- B
N/C
REF B
OUT B
SENSE B
VCC
SENSE A
OUT A
REF A
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Table 1. Pin assignments
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2007, THAT Corporation Document 600114 Rev 01
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
THAT 1280 Series
Dual Balanced Line Receiver ICs
Page 5 of 10
Document 600114 Rev 01
in absolute value of any individual resistor, RF
bypassing through the addition of R-C networks at
the inputs (series resistor followed by a capacitor to
ground at each input) is not recommended. The
added resistors can interact with the internal ones in
unexpected ways. If some impedance for the
RF-bypass capacitor to work against is deemed
necessary, THAT recommends the use of a ferrite
bead or balun instead.
If it is necessary to ac-couple the inputs of the
1280-series parts, the coupling capacitors should be
sized to present negligible impedance at any frequen-
cies of interest for common mode rejection. Regard-
less of the type of coupling capacitor chosen,
variations in the values of the two capacitors,
working against the 1280-series input impedance
(itself subject to potential imbalances in absolute
value, even when trimmed for perfect ratio match),
can unbalance common mode input signals. This can
convert common-mode to balanced signals which will
not be rejected by the CMRR of the devices. For this
reason, THAT recommends dc-coupling the inputs of
the 1280-series devices.
Input Voltage Limitations
When configured, respectively, for -3 dB and
-6 dB gain, the 1283 and 1286 devices are capable of
accepting input signals above the power supply rails.
This is because the internal opamp’s inputs connect
to the outside world only through the on-chip resis-
tors R1 through R4 at nodes a and b as shown in
Figure 2. Consider the following analysis.
Differential Input Signals
For differential signals (vIN(DIFF)), the limitation to
signal handling will be output clipping. The outputs
of all the devices typically clip at within 2V of the
supply rails. Therefore, maximum differential input
signal levels are directly related to the gain and
supply rails and can be calculated in dBu as follows:
Vin(diff) = 20 log
or
VCC−VEE
2
−2V
2
0.775
− Gain
Vin(diff) = 20 log(VCC − VEE − 4V) − Gain − 6.8dB
For example, If VCC=15V, VEE=-15V, and
Gain = -3 dB, then
Vin(diff) = 20 log[15V − (−15V) − 4V] − (−3dB) − 6.8dB
= 24.5 dBu
Common-Mode Input Signals
For common-mode input signals, there is essen-
tially no output signal. The limitation on common-
mode handling is the point at which the inputs are
overloaded. So, we must consider the inputs of the
opamp.
For common-mode signals (VIN(CM)), the common-mode
input current splits to flow through both R1/R2 and through
R3/R4. Because vb is constrained to follow Va, we will
consider only the voltage at node a.
The voltage at a can be calculated as:
V = V R4
a IN(CM) R3+R4
Solving for vIN(CM),
V = VIN(CM)
R3+R4
a R4
For the 1280, (R3 + R4) /R4 = 2. For the 1283,
(R3 + R4) /R4 = 2.4. For the 1286, (R3 + R4) /R4 = 3.
Furthermore, the same constraints apply to va as in
the differential analysis.
Following the same reasoning as above, the
maximum common-mode input signal for the 1280 is
(2VCC - 4) V, and the minimum is (2VEE + 4) V. For
the 1283, these figures are (2.4VCC - 4.8) V, and
(2.4VEE + 4.8) V. For the 1286, these figures are
(3VCC - 6) V, and (3VEE + 6) V.
Therefore, for common-mode signals and ±15 V
rails, the 1280 will accept up to ~26 V in either
direction. As an ac signal, this is 52 V peak-peak,
18.4 V rms, or +27.5 dBu. With the same supply
rails, the 1283 will accept up to ~31 V in either
direction. As an ac signal, this is 62 V peak-peak,
21.9 V rms, or +29 dBu. With the same supply rails,
the 1286 will accept up to ~39 V in either direction.
As an ac signal, this is 78 V peak-peak, 27.6 V rms,
or +31 dBu.
Of course, in the real world, differential and
common-mode signals combine. The maximum
signal that can be accommodated will depend on the
superposition of both differential and common-mode
limitations.
Output Considerations
The 1280-series devices are typically capable of
supplying 42 mA into a short circuit. While they will
survive a short, power dissipation will rise dramati-
cally if the output is shorted. Junction temperature
must be kept under 125 ºC to maintain the devices’
specifications.
These devices are stable with up to 300 pF of
load capacitance over the entire rated temperature
range, and even more at room temperature.
Power Supply Considerations
The 1280-series parts are not particularly sensi-
tive to the power supply, but they do contain wide
bandwidth opamps. Accordingly, small local bypass
capacitors should be located within a few inches of
the supply pins on these parts, as shown in Figure 4.
Selecting a Gain Variation
The three different parts offer different gain
structures to suit different applications. The 1286 is
customarily configured for -6 dB gain, but by revers-
ing the resistor connections, it can also be configured
for +6 dB. The 1283 is most often configured for
-3 dB gain, but can also be configured for +3 dB.
The choice of input gain is determined by the input
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2007, THAT Corporation
Datasheet pdf - http://www.DataSheet4U.net/
5 Page | ||
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