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參數(shù)資料
| 型號： | THAT4311 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Low-voltage, Low-power Analog Engine?? Dynamics Processor |
| 中文描述： | 低電壓，低功耗模擬引擎？？動態(tài)處理器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 230K |
| 代理商： | THAT4311 |
most out of the 4311, it is useful to know the major
differences among these opamps.
OA3, being internally connected to the output of
the VCA. is intended for current-to-voltage conver-
sion.
Its input noise performance, at 7 5
complements that of the VCA, adding negligible noise
at unity gain. Its output section is capable of driving
/
nV
Hz
,
1mA into a 2k
OA1 is the quietest opamp of the three, and with
its typical input referred noise of 65
opamp of choice for input stages. Its output section
load.
/
nV
Hz
, is the
is nominally capable of driving 3mA into a 5k
OA2 is best suited for control voltage processing,
though is does have anti-paralleled diodes that can
load.
be used to fashion it into a clipper. (However in most
applications where a clipper is needed, it’s preferable
to place it around OA3). OA2’s input noise is compa-
rable to OA3 and its output drive is comparably to
OA1.
The Reference Voltage - In Brief
THAT Corporation’s log/anti-log VCAs and RMS`
detectors require a reference voltage between the pos-
itive and negative power supplies, and to supply this,
the THAT 4311 provides an on-chip, 2V reference
about which the VCA, the RMS detector, and OA2 are
biased. This reference is a buffered band-gap refer-
ence that is amplified to 2V. Pins are provided for fil-
ter capacitors at both the input and the output of the
buffer, which are labeled CAP and VREF respectively.
Application Information
As noted previously, the THAT 4311 was origi-
nally designed for noise reduction systems, hence the
emphasis on those parameters in the specifications.
Its low power consumption, integration, and similar-
ity to the THAT 4301, however, extend its utility to a
variety of other products and applications. The cir-
cuit of Fig 19, shows a typical application for the
THAT 4311. This simple compressor/limiter design
features adjustable hard-knee threshold, compres-
sion ratio, and static gain. The applications discus-
sion in this data sheet will center on this circuit for
the purpose of illustrating important design issues.
Signal Path
As mentioned in the section on theory, the VCA
input pin is a virtual ground with negative feedback
provided internally. An input resistor (R1, 20k ) is
required to convert the AC input voltage to a current
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Rev. 08/30/01
Preliminary Information
Page 9
IN
17
12
OUT
VCA
EC-
EC+
SYM
OA3
Vref
U1A
THAT4311
Iset
THAT 4311
2
TC
5
IN
1
OUT
4
RMS
U1B
3
7
OA2
Vref
C6
6
U1C
THAT4311
18
19
20
OA1
U1D
THAT4311
Cap
8
Vee
THAT 4311
10
Vref9
Vcc
11
Vref
U1E
R1
20k
R2
20k
R3
51R
R4
33k
R5
20k
R15
10k
R6
28k7
R7
267k
R8
4k99
R9
10k
R10
82k
R12
20k
R13
10k
R11
51k
R17
82k
R16
4k99
R14
1k43
R18
50k
C1
+
47u
C2
47p
C3
+
47u
C4
10u
C5
100n
C7
100n
C8
10u
C9
22u
Vref
Vref
Vref
+5
+5
+5
+5
10u
In
Out
Vin0=-10dBu
CR1
1N4148
CR2
1N4148
Gain
Threshold
Compression
Ratio
15
14
13
16
+
+
+
+
Fig 19. Simple compressor / limiter using the THAT 4311
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