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1203 Schematic ( PDF Datasheet ) - THAT

Teilenummer 1203
Beschreibung InGenius High-CMRR Balanced Input Line Receiver
Hersteller THAT
Logo THAT Logo 




Gesamt 10 Seiten
1203 Datasheet, Funktion
T H AT Corporation
FEATURES
· High common-mode rejection
(typical 90 dB at 60 Hz) maintained
under real-world conditions
· Excellent solution for hum and
groundloop suppression
· Transformer-like noise rejection in
an 8-pin IC, at fraction of
transformer cost and size
InGeniusâ High-CMRR
Balanced Input Line Receiver
THAT 1200, 1203, 1206
APPLICATIONS
· Balanced input stages
· Summing amplifiers
· Transformer front-end
replacements
· ADC front-ends
Description
The THAT 1200 series of InGenius balanced
line receivers are designed to overcome a serious
limitation of conventional balanced input stages
— notoriously poor common mode rejection in
real world applications. While conventional input
stages may exhibit good rejection characteristics
in the lab and on paper, they perform poorly
when fed from even slightly unbalanced source
impedances — a common situation in almost any
pro sound environment.
Developed by Bill Whitlock of Jensen Trans-
formers, the patented InGenius input stage uses a
unique bootstrap circuit to raise its common-
mode input impedance into the megohm range,
but without the noise penalty that comes from
high-valued resistors. InGenius line receivers
maintain their high CMRR over a wide range of
source impedance imbalances — even when fed
from single-ended sources.
IN-
Ra
Rb
IN+
OA1
+1
Rc
OA2 Rd
+1
R1
OA4
+1
R3
R2
OA3
-
+
R4
R5
Vcc
Vee
Vout
REF
Pin Name
Ref
In-
In+
Vee
CM In
Vout
Vcc
CM Out
DIP Pin
1
2
3
4
5
6
7
8
SO Pin
3
4
5
6
11
12
13
14
Table 1. 1200-series pin assignments
CM IN
CM OUT
Cb
Figure 1. THAT1200-series equivalent circuit diagram
Gain
Plastic DIP Plastic SO
0 dB
1200P
1200S
-3 dB
1203P
1203S
-6 dB
1206P
1206S
Table 2. Ordering information
Protected under U.S. Patent No. 5,568,561 and other patents pending.
InGeniusâ is a trademark of THAT Corporation.
600033 Rev 0A
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com






1203 Datasheet, Funktion
Page 6
InGenius Balanced Line Receiver
Preliminary Information
THAT1206
or THAT1246 Vcc
Ref
Gnd
CM out or N/C
+
Cb
In- In-
In+ In+
Vcc
Vout
Connect
for
Vee CM in or Sense THAT1246
Vee
Figure 5. Dual PCB layout for THAT 1206 and THAT 1246
DIP version
Dual Layout Option
The THAT 1246 is a conventional balanced
line-receiver that is pin-for-pin compatible with the
Analog Devices SSM2143 and Burr-Brown INA137.
Though the THAT 1200 series is not pin-compatible
with the THAT 1246, the PCB layouts shown in Fig-
ures 5 and 6 provide manufacturers with the option
to stuff a PCB with any of these input stages. Note
that these figures are not to scale. The interconnects
should be as short as practicable constrained only by
component size and relevant manufacturing consid-
erations.
When a THAT 1200 series IC is installed, capaci-
tor Cb is connected between CM In and CM Out.
When the THAT 1246 (or SSM2143 or INA137) is
used, capacitor Cb is removed, and a jumper con-
nects the Vout and Sense pins.
Input Protection
Figure 7 shows the internal overvoltage protection
circuitry at the IN+, IN-, and CM IN pins. The values
of R and R’ vary with actual part number as shown in
Table 3.
While the internal protection circuitry shown is
adequate to keep the combination of signal and com-
mon mode voltages from driving the internal inputs
beyond the power supply rails, the circuitry does not
provide adequate protection against most ESD inci-
dents. Since these ICs will very often connect directly
to the outside world, it is mandatory that additional,
external protection from ESD be provided. Any un-
protected InGenius input will fail when subjected to
ESD if this protection circuitry is omitted. Addi-
THAT1206 Vcc
Gnd
THAT1246
Ref N/C
In- In- Vcc
In+ In+ Vout
Vee Vee Sense
CM Out
Vcc
Vout
CM in
Connect
for
THAT1246
+
Cb
Vee
Figure 6. Dual PCB layout for THAT 1206 and THAT 1246
Surface mount versions
tionally, proper ESD handling precautions must be
observed until the IC is properly affixed to the PCB.
Vcc
R
IN+
Vee
Vcc
R
IN-
R'
CM IN
R'
Vee
Figure 7. Internal input protection circuitry (see text)
Part No.
R
R’
THAT 1200
500W
23.5kW
THAT 1203
7kW
17kW
THAT 1206
7kW
17kW
Table 3. Input resistance values
Diodes D1-D6 in figures 3 and 4 show our recom-
mended approach to protecting the 1200 series from
ESD damage. This arrangement of 1N4148s and
12V Zener diodes permits the maximum allowable
input signal to reach the IC's input pins, but directs
high-energy ESD impulses to the rails. So long as the
supply rails are adequately decoupled, most ESD
events will be diminished to harmless levels.
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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