THAT4301S THAT-Corporation, THAT4301S Datasheet

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THAT4301S

Manufacturer Part Number
THAT4301S
Description
IC dynamic processor
Manufacturer
THAT-Corporation
Datasheet
1.THAT4301S.pdf (12 pages)

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T H A T
·
·
·
·
·
·
·
“THAT Analog Engine,” combines in a single IC
all the active circuitry needed to construct a
wide range of dynamics processors. The 4301
includes
tially-controlled
RMS-level sensor and three general- purpose
opamps.
age-sensitive control ports. Dynamic range ex-
ceeds 115 dB, and THD is typically 0.003% at 0
dB gain. In the 4301A, the VCA is selected for
low THD at extremely high levels. The RMS de-
tector provides accurate rms-to-dc conversion
over an 80 dB dynamic range for signals with
THAT 4301 Dynamics Processor, dubbed
The VCA provides two opposing-polarity, volt-
High-Performance Voltage
Controlled Amplifier
High-Performance RMS-Level
Detector
Three General-Purpose Opamps
Wide Dynamic Range: >115 dB
Low THD: <0.03%
Low Cost: $4.39 (‘000s)
DIP & Surface-Mount Packages
a
FEATURES
19
20
1
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
high-performance,
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
VCA,
+
-
OA1
THAT4301
IN
IT
2
Figure 1. Block Diagram (pin numbers are for DIP only)
a
RMS
18
log-responding
VCC
11
CT
OUT
5
exponen-
17
Description
4
IN
EC-
GND VEE
9
VCA
10
SYM
crest factors up to 10. One opamp is dedicated
as a current-to-voltage converter for the VCA,
while the other two may be used for the signal
path or control voltage processing.
trol and logarithmic detector response — “deci-
bel-linear”
mathematics of designing the control paths of
dynamics processors. This makes it easy to de-
sign audio compressors, limiters, gates, ex-
panders, de-essers, duckers, noise reduction
systems and the like. The high level of integra-
tion ensures excellent temperature tracking be-
tween
minimizing the external parts count.
14
EC+
The combination of exponential VCA gain con-
OUT
·
·
·
·
·
·
·
·
8
13
Compressors
Limiters
Gates
Expanders
De-Essers
Duckers
Noise Reduction Systems
Wide-Range Level Meters
the
6
+
+
APPLICATIONS
-
VCA
OA3
OA2
-
response
IC Dynamics Processor
THAT Analog Engine
and
THAT 4301, 4301A
12
7
—
the
simplifies
detector,
15
16
while
the
®

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THAT4301S Summary of contents

Page 1

FEATURES · High-Performance Voltage Controlled Amplifier · High-Performance RMS-Level Detector · Three General-Purpose Opamps · Wide Dynamic Range: >115 dB · Low THD: <0.03% · ...

Page 2

Page 2 Absolute Maximum Ratings (T Positive Supply Voltage ( Negative Supply Voltage ( Supply Current ( Overall Electrical Characteristics Parameter Symbol Positive Supply Voltage V Negative Supply Voltage V Positive Supply Current I ...

Page 3

THAT 4301 Dynamics Processor IC SPECIFICATIONS VCA Electrical Characteristics Parameter Symbol Total Harmonic Distortion (cont’d.) THD Symmetry Control Voltage V SYM RMS Detector Electrical Characteristics Parameter Symbol Input Bias Current I B (RMS) Input Offset Voltage V OFF(RMS In) Input ...

Page 4

Page 4 Specifications Opamp Electrical Characteristics Parameter Symbol Input Offset Voltage V OS Input Bias Current I B Input Offset Current I OS Input Voltage Range I VR Common Mode Rej. Ratio CMRR VS=±7V to ±15V Power Supply Rej. Ratio ...

Page 5

THAT 4301 Dynamics Processor IC Pin Name DIP P in RMS Time No Connection 3 RMS Out Time OA2 -In 6 OA2 Out 7 OA2 +In 8 ...

Page 6

Page 6 Figure 5. VCA Gain vs. Control Voltage (Ec-) at 25°C Figure 7. VCA 1kHz THD+Noise vs. Input, +15 dB Gain Figure 9. VCA THD vs. Frequency Gain, 1Vrms Input Figure 11. Departure from Ideal Detector Law ...

Page 7

THAT 4301 Dynamics Processor IC THAT 4301 Dynamics Processor combines THAT Corporation’s proven Voltage-Controlled Amplifier (VCA) and RMS-Level Detector designs with three general-purpose opamps to produce an Analog En- gine useful in a variety of dynamics processor appli- cations. For ...

Page 8

Page 8 value of the input signal current. Some ac component (at twice the input frequency) remains superimposed on the dc output. The ac signal is attenuated by a log-domain filter, which constitutes a single-pole rolloff with cutoff determined by ...

Page 9

THAT 4301 Dynamics Processor IC The circuit of Figure 14, Page 9, shows a typical application for THAT 4301. This simple compres- sor/limiter design features adjustable hard-knee threshold, compression ratio, and static gain applications discussion in this data sheet will ...

Page 10

Page 10 choice with this circuit) and observe THD at the sig- nal output. Set the trim for minimum THD. RMS-Level Detector The RMS detector’s input is similar to that of the VCA. An input resistor ( kW) ...

Page 11

THAT 4301 Dynamics Processor IC The GAIN control ( used to provide static 18 gain or attenuation in the signal path. This control adds up to ±130 mV offset to the output ...

Page 12

Page 12 THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com Notes Rev. 04/10/02 ...

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