that4301 THAT Corporation, that4301 Datasheet

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that4301

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

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Doc. 600069 Rev. 02
T H A T
19
20
1
·
·
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·
·
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·
“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
DIP & Surface-Mount Packages
+
-
OA1
THAT4301
Figure 1. Block Diagram (pin numbers are for DIP only)
IN
IT
2
RMS
18
a
FEATURES
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
VCC
high-performance,
11
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com
CT
OUT
C o r p o r a t i o n
5
VCA,
17
4
IN
EC-
GND VEE
a
9
VCA
log-responding
10
SYM
14
EC+
OUT
exponen-
8
13
Description
6
+
+
-
OA3
OA2
-
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.
12
7
The combination of exponential VCA gain con-
·
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·
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15
16
Compressors
Limiters
Gates
Expanders
De-Essers
Duckers
Noise Reduction Systems
Wide-Range Level Meters
the
APPLICATIONS
VCA
response
Compliant
Compliant
IC Dynamics Processor
Model
4301A
4301A
RoHS
RoHS
4301
4301
THAT Analog Engine
Table 1. Ordering Information
and
THAT 4301, 4301A
the
4301AP20-I
4301P20-I
4301AP20
DIP Pkg
20 pin
---
simplifies
detector,
30 pin DMP
4301M30-I
(SO) Pkg
4301M30
while
---
---
the
®

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that4301 Summary of contents

Page 1

... VCC - 19 OA1 + 20 THAT4301 RMS IN 1 OUT Figure 1. Block Diagram (pin numbers are for DIP only) THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Doc. 600069 Rev. 02 Tel: +1 (508) 478-9200 ...

Page 2

... All specifications subject to change without notice. 2. Unless otherwise noted, T =25° Test circuit is the VCA section only from Figure 2. THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com SPECIFICATIONS +18 V Power Dissipation (P ...

Page 3

... Output Temp. Coefficient o Output Current I OUT 4. Except as noted, test circuit is the RMS-Detector section only from Figure 2. THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com (Cont’d.) 3 4301 Conditions Min Typ ...

Page 4

... R5 50K VCA SYM -15V R1 R4 300K R3 20K0 1% 51 SYM - VCA OA1 OUT IN + EC+ EC- THAT4301 VCC VEE RMS IN OUT Ct It GND R7 C4 2M00 1% 10uF -15V Figure 2. VCA and RMS detector test circuit Document 600069 Rev 02 5 OA2 OA3 Typ Max Min ...

Page 5

... Max. M 4.7 Max. N 0.51 Min. 0.02 Min. O 2.8 Min. 0.11 Min. P 0.25 +0.15 -0.05 0.01 +0.006 -0.002 Figure 3. Plastic dual in-line package outline THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com SO Pin Pin Name VCA In 5 OA1 Out 6 OA1 -In 7 ...

Page 6

... 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 vs. Level THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com Representative Data Figure 6. VCA 1kHz THD+Noise vs. Input, -15 dB Gain Figure 8. VCA 1kHz THD+Noise vs. Input Gain Figure 10. RMS Output vs. Input Level, 1 kHz & ...

Page 7

... Positive Control In C1 Signal In 47uF - OA1 + THAT4301 VCC VEE IN It Figure 13. Driving the VCA via the Positive Control Port While the 4301’s VCA circuitry is very similar to that of the THAT 2150 Series VCAs, there are several important differences, as follows: in Figure 2) ...

Page 8

... However, a 15% mismatch will not significantly increase ripple-induced distortion in dynamics processors over that caused by signal THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com ripple alone. 2) The time constant of the 4301’s RMS detector is ...

Page 9

... R9 THRESHOLD 10K0 1% CCW R11 CR2 C9 22p R12 383K 1% 10K R10 CR1 CW 2M00 1% - 4k99 1% OA1 + +15 C7 100n THAT4301 VCC C8 100n VEE C3 RMS IN OUT - 10K0 1% 47uF R7 C6 2M00 C4 1% 10uF R14 22uF 1K43 1% -15 CW R13 10K CCW Figure 14 ...

Page 10

... RMS detector output drive the output of OA tive. This forward biases CR , closing the feedback 2 THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com loop such that the junction the threshold detector) sits at -(R the circuit of Figure 14, this is –2 RMS ...

Page 11

... The threshold of compression may be varied over a ±30 dB range from about –46 dBV to +14 dBV. The compression ratio THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com may be varied from 1:1 (no compression) to ¥:1. ...

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 Document 600069 Rev 02 Notes ...

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