that4301 THAT Corporation, that4301 Datasheet - Page 11

• Manufacturer Part Number: that4301
• Description: That Analog Engine Ic Dynamics Processor
• Manufacturer: THAT Corporation

THAT 4301 Analog Engine IC Dynamics Processor
gain or attenuation in the signal path. This control
adds up to ±130 mV offset to the output of OA
-V
±20 dB change in gain of the VCA. C
uate the noise of OA
through R
and passive components produce noise which is
passed on to the control port of the VCA, causing
modulation of the signal. By itself, the 4301 VCA pro-
duces very little noise modulation, and its perfor-
mance can be significantly degraded by the use of
noisy components in the control voltage path.
Overall Result
hard-knee compression above threshold with three
essential user-adjustable controls. The threshold of
compression may be varied over a ±30 dB range from
about –46 dBV to +14 dBV. The compression ratio
+
R
The GAIN control (R
The
16
R
17
resulting
16
to -V
used in the control path. All these active
-
R
16
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
compressor
R
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
17
2
, OA
), which is approximately
18
) is used to provide static
1
and the resistors R
circuit
5
is used to atten-
provides
2
(from
8
may be varied from 1:1 (no compression) to ¥:1.
And, static gain may be added up to ±20 dB. Audio
performance is excellent, with THD running below
0.05% at middle frequencies even with 10 dB of com-
pression, and an input dynamic range of over
115 dB.
only scratches the surface of the large body of appli-
cations circuits which may be constructed with THAT
4301.
wide-dynamic-range, log-responding level detector
with a high-quality, exponentially-responding VCA
produces a versatile and powerful analog engine. The
opamps provided in the 4301 enable the designer to
configure these building blocks with few external
components to construct gates, expanders, de-essers,
noise reduction systems and the like.
please contact us at the address below.
Perhaps most important, this example design
For further information, samples and pricing,
The
combination
of
an
accurate,
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