1293Q16-U THAT Corporation, 1293Q16-U Datasheet - Page 7

• Manufacturer Part Number: 1293Q16-U
• Description: Difference Amplifiers Dual Bal. Line Receiver -3 db
• Manufacturer: THAT Corporation

Specifications of 1293Q16-U

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

THAT 1290 Series
Low Cost Dual Balanced Line Receivers
thought of as precision differential amplifiers with
gains of zero, -3 and -6 dB respectively. These
devices are primarily intended as balanced line
receivers for audio applications.
topology lends itself to other applications as well.
Basic Balanced Receiver Applications
1293 and 1296 configured as zero, -3 dB, and -6 dB
line receivers. Figures 8 and 9, respectively, show
the 1293 and 1296 configured as +3 dB and +6 dB
line receivers. The higher gains are achieved by
swapping the positions of the resistors within each
pair in regard to signal input vs. output.
Precision Summing Application
sion summing amplifier. This circuit uses both the
In+ and Ref pins as inputs.
matching between the resistor pairs, the output
voltage is precisely equal to the sum of the two input
voltages.
In-
In+
In-
In+
The THAT 1290, 1293, and 1296 are usually
Figures 5, 6, and 7, respectively, show the 1290,
Figure 10 shows a 1290 configured as a preci-
2/6
3/5
2/6
3/5
In+
In-
In-
In+
Figure 5. Zero dB line receiver
Figure 6. -3 dB line receiver
10.5k
10.5k
9k
9k
13
13
4
4
V
V
V
V
CC
EE
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
CC
EE
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
7.5k
7.5k
9k
9k
Because of the good
Sense
Sense
U1
1290
Vout
U1
1293
Vout
Ref
Ref
However, their
14/12
15/11
16/10
14/12
15/11
16/10
Copyright © 2008, THAT Corporation
Output
Output
Applications
Page 7 of 10
Instrumentation Amplifier Application
as an instrumentation amplifier. The two opamps
preceding the 1290 buffer the input signal before
passing it on to the 1290. The OP270 shown was
chosen for its combination of good ac and dc
performance.
provide gain equal to 1+(9.98 kΩ / R
signals, but unity gain for common-mode signals.
The 1290 then rejects the common mode signal while
passing on the differential portion.
opamps buffer the input of the 1290, raising the
circuit’s input impedance to both differential and
common-mode signals.
common-mode rejection less sensitive to variations
in the source impedance driving the stage.
THAT’s InGenius
to increase common-mode input impedance. This
even further improves common-mode rejection in
real-world applications. See the THAT 1200-series
datasheet for more information.
In+
In-
In+
In-
Figure 11 shows one half of a 1290 configured
As noted in the Theory of Operation section,
3/5
2/6
In-
In+
2/6
3/5
Figure 8. +3 dB line receiver
Figure 7. -6 dB line receiver
In-
In+
12k
12k
In this configuration, the opamps
®
10.5k
10.5k
input stages use patented circuitry
13
4
V
V
13
CC
EE
4
V
V
CC
EE
This makes the circuit’s
Document 600121 Rev 01
6k
6k
7.5k
7.5k
Sense
U1
1296
Vout
Sense
U1
1293
Vout
Ref
Ref
g
) for differential
15/11
14/12
15/11
16/10
16/10
14/12
As well, the
Output
Out