that1200 THAT Corporation, that1200 Datasheet

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that1200

Manufacturer Part Number
that1200
Description
Ingenius High-cmrr Balanced Input Line Receiver Ics
Manufacturer
THAT Corporation
Datasheet
600033 Rev 00
T H A T
·
·
·
·
·
receivers
conventional balanced input stages: poor common
mode rejection in real-world applications. While
conventional input stages measure well in the lab
and perform well on paper, they fail to live up to
their CMRR specs when fed from even slightly
unbalanced source impedances — a common
situation in almost any pro sound environment.
This is because conventional stages have low
common-mode input impedance, which interacts
with imbalances in source impedance to unbalance
common-mode signals, making them indistin-
guishable from desired, balanced signals.
High CMRR: typ. 90 dB at 60 Hz
Extremely high common-mode input
impedance
Transformer-like performance in an IC
Excellent audio performance
Several gains: 0 dB, -3 dB, & -6 dB
·
·
·
·
·
The THAT 1200-series InGenius balanced line
IN-
IN+
Maintains balance under real-world
conditions
Wide bandwidth: typ. > 22 MHz
High slew rate: typ. 12 V/us
Low distortion: typ. 0.0005 % THD
Low noise: typ. -107 dBu
Figure 1. THAT1200-series equivalent circuit diagram
THAT1200
THAT1203
THAT1206
Protected under U.S. Patent Numbers, 5,568,561 and 6,160,451. Additional patents pending.
Part no.
R6
R9
overcome
R7
R8
FEATURES
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
C o r p o r a t i o n
CM IN
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
R6 , R9
+1
+1
7 Ù
7 Ù
OA1
0
k
k
a
OA2
R10
24K
24K
R11
InGenius is a registered trademark of THAT Corporation.
Cb
serious
+1
R7 , R8
OA4
24 kÙ
17 Ù
17 Ù
R1
R3
k
k
limitation
CM OUT
R1 , R3
6 kÙ
6 Ù
7 Ù
k
k
OA3
-
+
24K
Description
R2
R4
R5
of
R2 , R4
6 kÙ
6 Ù
5 Ù
k
k
Vcc
Vee
Vout
REF
Transformers, the patented InGenius input
stage uses
common-mode input impedance into the meg-
ohm range without the noise penalty from the
obvious solution of using high-valued resistors.
Like transformers, InGenius line receivers
maintain their high CMRR over a wide range of
source impedance imbalances — even when fed
from single-ended sources. But unlike trans-
formers, these wide bandwidth solid state de-
vices offer dc-coupling, low distortion, and
transparent sound in a small package at rea-
sonable cost.
·
·
·
·
·
Balanced Input Line Receiver ICs
Developed by Bill Whitlock of Jensen
Balanced Audio Line Receivers
Instrumentation Amplifiers
Differential Amplifiers
Transformer Front-End Replacements
ADC Front-Ends
THAT 1200, 1203, 1206
APPLICATIONS
clever bootstrapping to raise its
Pin Name
Table 1. 1200-series pin assignments
-3 dB
-6 dB
Gain
0 dB
CM Out
CM In
Vout
Vee
Vcc
Ref
In+
In-
Table 2. Ordering information
InGenius High-CMRR
Plastic DIP
1200P
1203P
1206P
DIP Pin
1
2
3
4
5
6
7
8
Plastic SO
1200S
1203S
1206S
SO Pin
1
2
3
4
5
6
7
8

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that1200 Summary of contents

Page 1

... THAT1203 7 Ù k THAT1206 Figure 1. THAT1200-series equivalent circuit diagram Protected under U.S. Patent Numbers, 5,568,561 and 6,160,451. Additional patents pending. THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com 600033 Rev 00 Description serious ...

Page 2

... IEC kHz 600Ω unmatched source impedances kHz At 60 Hz, with THAT1200 THAT1203 THAT1206 5. Per IEC Standard 60268-3 for testing CMRR of balanced = -15V inputs Defined with respect to the differential gain. = 25° °C/W PDIP Pkg 104 ° ...

Page 3

... In- CMout Vcc 5 CMin Out Ref 6 3 Vee R4 In THAT120x C3 C2 300p 100n Vee Figure 2. THAT1200-series test circuit Page 3 Min Typ Max Units — 0.0005 — % — -106 — dBu — -105 — dBu — -107 — dBu ±10 — ...

Page 4

... lead to less than perfect CMRR. 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 High CMRR-Balanced Input Line Receiver IC Theory of Operation The Impact of Driving Source Impedance ...

Page 5

... Instrumentation Amplifiers Some designers prefer the more elaborate ap- proach of an instrumentation amplifier, as shown in Figure 6. In this circuit possible to raise the in- THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com In- Ri1 will cause the ...

Page 6

... IN IN Figure 8. THAT1200-series equivalent circuit diagram Common Mode Bootstrapping in an Instrumentation Amplifier = InGenius The genius behind Bill Whitlock's invention was to recognize that in an instrumentation amplifier possible bootstrap the common-mode signal to in- crease common-mode input impedance. This is the concept behind the InGenius patents ...

Page 7

... Common-Mode to Differential-Mode Conversion in Shielded Twisted-pair Cables (Shield-Current-Induced Noise), by Jim Brown & Bill Whitlock, AES 114th Convention, Preprint 5747, February 2003 THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com noise for relatively high-voltage applications like this ...

Page 8

... NPO C1 b 100pF NPO C2 cost. For the b Figure 10. THAT1200 application with and R should closely equal the signal at the junction see the same signal - AC and DC - except for offsets The objective provide RF bypassing from pins 2 2 and C to chassis ground ...

Page 9

... R2 100R Figure 11. THAT1200 application with recommended RFI protection. The one drawback to this circuit is that C will reduce the common-mode input impedance of the 1200 stage kΩ kHz. Of course, this figure drops by a factor of ten for each decade in- crease in frequency ...

Page 10

... C2 470pF R2 100R RFI protection Figure 14. RFI and ESD protection for the 1200 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 High-CMRR Balanced Input Line Receiver ICs Vcc 220uF D5 12V ...

Page 11

... When a THAT 1200-series IC is installed, capaci- tor C is connected between CM b nection is made between V THAT 1240-series is used, capacitor C and a jumper connects the V LIFE SUPPORT POLICY Page 11 load only for THAT1200-series Vcc + CM out or N/C Cb Vcc Vout Sense Short only for THAT1240-series ...

Page 12

... Figure 17. -S (SO) version package outline drawing 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 High-CMRR Balanced Input Line Receiver ICs The surface-mount package has been qualified using reflow temperatures as high as 260°C for 10 seconds ...

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