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PDF THAT1430 Data sheet ( Hoja de datos )

Número de pieza THAT1430
Descripción (THAT1420 / THAT1430) Balanced Line Drivers
Fabricantes That 
Logotipo That Logotipo



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T H AT Corporation
FEATURES
· OutSmartsÔ technology tames
clipping behavior into single-ended
loads
· Pin-compatible with SSM2142
· Balanced, floating output delivers
transformer-like behavior
· Stable when driving long cables
and capacitive loads
· THAT 1430 delivers low output
offset voltage using single capacitor
OutSmartsä Balanced Line Drivers
THAT 1420, 1430
APPLICATIONS
· Differential Line Driver
· Audio Mix Consoles
· Distribution Amplifiers
· Audio Equalizers
· Dynamic Range Processors
· Digital Effects Processors
· Telecommunications Systems
· Instrumentation
· Hi-Fi Equipment
Description
The THAT 1420 and 1430 are a new genera-
tion of audio differential line drivers with im-
proved performance over conventional
cross-coupled monolithic designs. Both models
exhibit low noise and distortion, high slew rate,
stability under difficult loads, wide output swing,
and have outputs which are short-circuit pro-
tected.
In addition both models incorporate patented
OutSmartsÔ technology, a dual feedback-loop de-
sign that prevents the excessive ground currents
typical of cross-coupled output stages (CCOS)
when clipping into single-ended loads1.
To overcome this problem, the THAT 1420
and 1430 use two individual negative-feedback
loops to separately control the differential output
voltage and common mode output currents, mak-
ing the design inherently more stable and less
sensitive to component tolerances than the CCOS.
Most importantly, the dual-feedback design pre-
vents the loss of common-mode feedback that
plagues the CCOS designs, avoiding the excessive
ground currents and overly-distorted output
waveform that can result when driving sin-
gle-ended loads.
Where minimum output offset voltage with
minimum parts count is desired, the THAT 1430
further improves over existing designs. In con-
ventional CCOS circuits, two relatively high-value
electrolytic capacitors are required to reduce the
offset voltage. By contrast, the THAT 1430 topol-
ogy requires only a resistor and a single film or
ceramic capacitor to achieve the same effect at
lower parts count and price.
Vcc
In+
Gnd
Vee
10k
5k Din+
Cin+
10k
Dout-
Cin- AD & AC
5k Din-
Dout+
10k
10k
THAT 1420
50
Out-
Sens+
10k 20k
10p
CEXT
10k
50
20k
Sens-
Out+
CEXT
Figure 1. THAT 1420 Equivalent Circuit Diagram
DIP Pin
Number
SO Pin
Number
1420 Pin
Name
1430 Pin
Name
1 3 Out- Out-
2
4
Sens-
Cap2
3 5 Gnd Gnd
4 6 In In
5 11 Vee Vee
6 12 Vcc Vcc
7
13
Sens+
Cap1
8
14
Out+
Out+
Table 1. THAT 1420/1430 pin assignments
1. See Gary Hebert’s paper, An Improved Balanced, Floating Output Driver IC, presented at the 108th AES Convention, Feb. 2000
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 page




THAT1430 pdf
Rev. 4/24/01
Preliminary Information
Page 5
VCC
C4
100n
In
6
7
4
Vcc
In Sens+
8
Out+
3 GnVd5eSe2ensO-UTu1HtA1-T1420
C5
100n
VEE
VCC
C6
100n
27
In-
Vcc 6 Out
Out
Ref
3 Vee
In+
1 U2
4 THAT1243 or equiv.
C7
VEE 100n
Figure 4. Basic THAT 1420 applications circuit
Applications
Circuit implementations using the THAT
1420/1430 are relatively straightforward. A quiet,
solid ground reference, stiff voltage supplies, and ad-
equate supply bypassing are all that is required to
achieve excellent performance out of both ICs. Both
devices are stable into any capacitive load, and the
maximum capacitance is limited only by slew rate
and frequency response considerations.
For the purposes of the frequency response calcu-
lation, the line driver’s 50W sense resistors can be
lumped into a single 100W resistor. The correct ca-
ble capacitance to use is the sum of the
inter-conductor capacitance and the two conduc-
tor-to-shield capacitances. Unfortunately, some man-
ufacturers only specify the inter-conductor
capacitance and the capacitance of one conductor to
the other while connected to the shield, and some ex-
traction may be required.
As an example, one manufacturer supplies a
shielded, twisted pair with 30pF/ft of inter-conductor
capacitance and 25pF/ft of conductor to shield capac-
4. Copyright ã 1991 Rane Corporation
itance. The corner frequency of the THAT 1420/1430
driving 500 ft of this cable will be
fC
=
1
2´p ´100500 (30 pF
ft+ 25 pF
ft+ 25 pF
ft)
» 40kHz
One must also consider the slew rate limitations
posed by excessive cable and other capacitances. We
know that
i
=
C
dV
dt
and that
dV
dt
=
VPeak
´ 2p
´
f
Rane Corporation has published a document titled
RaneNote 1264, which specifies some of the require-
ments for a balanced line driver, including a)
stablility into reactive loads, b) output voltage swing
of at least ±11 volts peak (+20dBu), and c) reliabil-
ity. This document also suggests a reasonable rule
by which to calculate the output current require-
ments at 20kHz. The author concludes that the ac-
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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