THAT1206 THAT Corporation, THAT1206 Datasheet

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THAT1206

Manufacturer Part Number
THAT1206
Description
(THAT1200 / THAT1203 / THAT1206) Ingenius High-cmrr Balanced Input Line Receiver
Manufacturer
THAT Corporation
Datasheet
600033 Rev 0A
IN-
IN+
T H A T
·
·
·
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.
The THAT 1200 series of InGenius balanced
Rb
Ra
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
Figure 1. THAT1200-series equivalent circuit diagram
CM IN
FEATURES
OA2
OA1
+1
+1
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com
C o r p o r a t i o n
Rd
Rc
Protected under U.S. Patent No. 5,568,561 and other patents pending.
Cb
OA4
+1
R3
R1
InGenius â is a trademark of THAT Corporation.
CM OUT
-
OA3
+
Description
R2
R4
R5
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.
Vcc
Vee
Vout
REF
·
·
·
·
Developed by Bill Whitlock of Jensen Trans-
Balanced input stages
Summing amplifiers
Transformer front-end
replacements
ADC front-ends
Balanced Input Line Receiver
THAT 1200, 1203, 1206
APPLICATIONS
Pin Name
-3 dB
-6 dB
Gain
0 dB
CM Out
Table 1. 1200-series pin assignments
CM In
Vout
Vee
Vcc
Ref
In+
In-
InGenius
Table 2. Ordering information
Plastic DIP
1200P
1203P
1206P
DIP Pin
â
1
2
3
4
5
6
7
8
High-CMRR
Plastic SO
1200S
1203S
1206S
SO Pin
11
12
13
14
3
4
5
6

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THAT1206 Summary of contents

Page 1

... Rb OA2 IN Figure 1. THAT1200-series equivalent circuit diagram Protected under U.S. Patent No. 5,568,561 and other patents pending. 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 · · · · Description Developed by Bill Whitlock of Jensen Trans- ...

Page 2

... IN-DIFF Z IN-CM 1. All specifications are subject to change without notice. 2. Unless otherwise noted, T =25° dBu = 0.775Vrms. 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 SPECIFICATIONS A +18 V Power Dissipation (P -18 V Operating Temperature Range (T ...

Page 3

... THAT1206 kW 300 THAT1200 THAT1203 THAT1206 At CM output Lcm Lcm Lcm kHz max differential input THAT1200 THAT1203 THAT1206 Page 3 Min Typ Max Units 70 90 — — dB — 85 — ±10V CM — 70 — ...

Page 4

... Referring to Figure 3, electrolytic capacitor Cb provides the feedback path for the boostrap circuit. The capacitor value is chosen to be high enough to present a sufficiently small impedance to signals at THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com Conditions = 0 W ...

Page 5

... Cb. In that case, choose the XLR 100pF NPO C1 100pF NPO C2 Figure 4. THAT1200P showing simplified RFI protection scheme THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com Vcc D1 (see text) 12V 4k7 C4 100pF ...

Page 6

... ESD be provided. Any un- protected InGenius input will fail when subjected to ESD if this protection circuitry is omitted. THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com THAT1206 THAT1246 + Gnd Ref Cb ...

Page 7

... High resistance carries with it a high noise pen- alty, making this straightforward impractical for quality audio devices. THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com +Vin Ri1 Ri2 -Vin Figure 8. Basic differential amplifier ...

Page 8

... Hence no common-mode current flows in resistors Ra and Rb. Since, ideally, no current flows, the input imped- ance to common mode signals is infinite. THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com InGenius Balanced Line Receiver + In ...

Page 9

... This, of course, results in a cost penalty that is somewhat exacer- bated by the price premium for high-value resistors. THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com Second, this design requires at least two IC pack- ages — ...

Page 10

... Figure 13. -P (DIP) version package outline drawing Information furnished by THAT Corporation is believed to be accurate and reliable. However no responsibil- ity is assumed by THAT Corporation for its use nor for any infringements of patents or other rights of third par- ties which may result from its use. ...

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