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1200P Datasheet

  • 1200P

  • InGenius High-CMRR Balanced Input Line Receiver

  • 10頁(yè)

  • ETC

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T H AT
Corporation
FEATURES
路
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
路
路
路
路
InGenius
芒
High-CMRR
Balanced Input Line Receiver
THAT
1200, 1203, 1206
APPLICATIONS
Balanced input stages
Summing amplifiers
Transformer front-end
replacements
ADC front-ends
路
路
Description
The THAT 1200 series of
InGenius
balanced
line receivers are designed to overcome a serious
limitation of conventional balanced input stages
鈥?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 鈥?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 鈥?even when fed
from single-ended sources.
Pin Name
DIP Pin
1
2
3
4
5
6
7
8
SO Pin
3
4
5
6
11
12
13
14
OA1
IN-
Ra
+1
Rc
Ref
R1
R2
Vcc
Vee
Vout
In-
In+
Vee
CM In
Vout
Vcc
OA4
+1
OA3
-
+
R4
R5
Rb
IN+
OA2 Rd
+1
R3
CM Out
REF
Table 1. 1200-series pin assignments
Gain
0 dB
Plastic DIP
1200P
1203P
1206P
Plastic SO
1200S
1203S
1206S
CM IN
CM OUT
Cb
-3 dB
-6 dB
Figure 1. THAT1200-series equivalent circuit diagram
Table 2. Ordering information
Protected under U.S. Patent No. 5,568,561 and other patents pending.
InGenius
芒
is a trademark of THAT Corporation.
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
600033 Rev 0A
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com

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