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THAT1420 Datasheet

(THAT1420 / THAT1430) Balanced Line Drivers

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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




That

THAT1420 Datasheet Preview

THAT1420 Datasheet

(THAT1420 / THAT1430) Balanced Line Drivers

No Preview Available !

Page 2
THAT1420/1430 Balanced Line Driver
Preliminary Information
SPECIFICATIONS2
Absolute Maximum Ratings (TA = 25°C)
Positive Supply Voltage (Vcc)
+18 V
Operating Temperature Range (TOP)
Negative Supply Voltage (Vee)
-18 V
Storage Temperature (TST)
Output Short Circuit Duration
Continuous
Junction Temperature (TJ)
Power Dissipation (PD)
TBD mW
Lead Temperature (TLEAD)(Soldering 60 sec)
-40 to +85°C
-40 to +150°C
150°C
300°C
Electrical Characteristics3
Parameter
Input Impedance
Gain
Gain
DC Power Supply
Rejection Ratio
Symbol
ZIN
G1
G2
PSRR
Conditions
RL=600W
Balanced
Single Ended
RL=100kW
Balanced
Single Ended
±4V to ±18V
Min. Typ. Max.
45
4.35
4.4
4.65
4.6
4.95
4.8
5.8 6 6.2
5.8 6 6.2
80 105
Output Common-Mode
Rejection Ratio
Output Signal Balance Ratio
THD+N (Balanced)
THD+N (Single Ended)
Output Noise
Headroom
Slew Rate
Output Common Mode
Voltage Offset
THAT1420
Output Common Mode
Voltage Offset
THAT1430
OCMRR
SBR
THD+N1
THD+N2
SNR
HR
SR
VOCM
VOCM
VOCM
VOCM
f=1kHz, BBC Method
50
f=1kHz, BBC Method
28
20Hz-20kHz
1kHz
VO=10 VRMS, RL=600W, 20Hz-20kHz
Bal. Mode, 20 kHz BW
0.1% THD+N
68
40
0.001
0.0005
0.0018
-104
25
16
RL=600W, w/o Sense capacitors
RL=600W, w/ Sense capacitors
-300
-6
±60
±4
RL=600W, w/o Sense capacitor
RL=600W, w/ Sense capacitor
-400
-20
±80
±10
300
6
400
20
Units
kW
dB
dB
dB
dB
dB
dB
dB
%
%
%
dBV
dBV
V/mS
mV
mV
mV
mV
2. All specifications are subject to change without notice.
3. All measurements taken with VS=±18, T=25°C, unless otherwise noted
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com


Part Number THAT1420
Description (THAT1420 / THAT1430) Balanced Line Drivers
Maker That
Total Page 8 Pages
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