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THAT4311 Datasheet

  • THAT4311

  • Low-voltage, Low-power Analog Engine?? Dynamics Processor

  • 12頁

  • ETC

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T H AT
Corporation
FEATURES
路
High Performance VCA, RMS-Level
Detector, and three 0pamps in one
package
Wide Dynamic Range: >105 dB
Low THD: <0.09%
Low Power: 7 mA typ.
Surface-Mount Package
5 VDC Operation
Low-voltage, Low-power
Analog Engine
廬
Dynamics Processor
THAT
4311
APPLICATIONS
路
路
路
路
路
路
Wireless microphone systems
Wireless in-ear monitors
Compressors and Limiters
Gates
De-Essers
Duckers
路
路
路
路
路
Description
The THAT 4311 Low Power Dynamics Proces-
sor combines in a single IC all the active circuitry
needed to construct a wide range of dynamics
processors. The 4311 includes a high perfor-
mance, voltage controlled amplifier, a log re-
sponding RMS-level sensor and three opamps,
one of which is dedicated to the VCA, while the
other two may be used for the signal path or con-
trol voltage processing.
The exponentially-controlled VCA provides
two opposing-polarity, voltage sensitive control
ports. Dynamic range exceeds 105 dB, and THD
is typically 0.09% at 0dB gain. The RMS detector
provides accurate RMS to DC conversion over an
80 dB dynamic range.
Though originally designed for use in micro-
phone noise reduction systems, the 4311 is a use-
ful building block in a number of analog signal
processing applications. The combination of ex-
ponential VCA gain control and logarithmic detec-
tor response - 鈥渄ecibel-linear鈥?response -
simplifies the mathematics of designing the con-
trol paths of dynamics processors, making it easy
to develop audio compressors, limiters, gates, ex-
panders, de-essers, duckers, and the like. The
high level of integration ensures excellent temper-
ature tracking between the VCA and the detector,
while minimizing the external parts count.
Pin Name
RMS IN
18
17
16
15
14
13
12
11
VCC
19
EC-
EC+
SYM
OUT
DMP20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
IT (I
TIME
)
OA2 -IN
RMS OUT
CT (C
TIME
)
CLIP
OA2 OUT
CAP
OA1
20
IN
VCA
OA3
VREF
VREF
THAT4311
1
IN
IT
VREF
VEE
VCC
OA3 OUT
VCA OUT
SYM
EC+
RMS
CT
OUT
OA2
VEE
2
3
4
5
6
7
8
9
10
EC-
VCA IN
OA1 OUT
OA1 -IN
OA1 +IN
Figure 1. THAT 4311 equivalent block diagram
Table 1. THAT 4311 pin assignments
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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