T H A T
Corporation
FEATURES
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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
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THAT Analog Engine
®
IC Dynamics Processor
THAT
4301, 4301A
APPLICATIONS
Compressors
Limiters
Gates
Expanders
De-Essers
Duckers
Noise Reduction Systems
Wide-Range Level Meters
Description
THAT 4301 Dynamics Processor, dubbed
“THAT Analog Engine,” combines in a single IC
all the active circuitry needed to construct a
wide range of dynamics processors. The 4301
includes
a
high-performance,
exponen-
tially-controlled
VCA,
a
log-responding
RMS-level sensor and three general- purpose
opamps.
The VCA provides two opposing-polarity, volt-
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
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.
The combination of exponential VCA gain con-
trol and logarithmic detector response — “deci-
bel-linear”
response
—
simplifies
the
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 the VCA and the detector, while
minimizing the external parts count.
18
11
17
14
13
12
19
-
+
OA1
VCC
IN
EC-
SYM
VCA
OUT
EC+
-
+
OA3
15
20
THAT4301
1
IN
IT
2
RMS
+
OUT
CT
5
4
16
OA2
GND VEE
9
10
8
6
-
7
Figure 1. Block Diagram (pin numbers are for DIP only)
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com
Page 2
Rev. 04/10/02
SPECIFICATIONS
1 , 2
Absolute Maximum Ratings (T
A
= 25°C)
Positive Supply Voltage (V
CC
)
Negative Supply Voltage (V
EE
)
Supply Current (I
CC
)
+18 V
-18 V
20 mA
Power Dissipation (P
D
) (T
A
= 75°C)
Operating Temperature Range (T
OP
)
Storage Temperature Range (T
ST
)
700 mW
0 to +70°C
-40 to +125°C
Overall Electrical Characteristics
Parameter
Positive Supply Voltage
Negative Supply Voltage
Positive Supply Current
Negative Supply Current
Thermal Resistance
Symbol
V
CC
V
EE
I
CC
I
EE
q
J-C
SO-Package
Conditions
Min
+7
-7
—
—
—
Typ
—
—
12
-12
140
Max
+15
-15
18
-18
—
Units
V
V
mA
mA
°C/W
VCA Electrical Characteristics
3
4301
Parameter
Input Bias Current
Input Offset Voltage
Input Signal Current
Gain at 0V Control
Gain-Control Constant
E
C+
/Gain (dB)
E
C-
/Gain (dB)
Gain-Control TempCo
Gain-Control Linearity
Off Isolation
Output Offset Voltage Change
DE
C
/
DT
CHIP
Symbol
I
B(VCA)
V
OFF(VCA In)
I
IN(VCA)
or I
OUT(VCA)
G
0
E
C+
= E
C–
= 0.000V
T
A
= 25°C (T
CHIP
@
55°C)
-60 dB < gain < +40dB
E
C+
& SYM
E
C-
Ref T
CHIP
= 27°C
-60 to +40 dB gain
6.4
-6.4
—
—
6.5
-6.5
+0.33
0.5
115
6.6
-6.6
—
2
—
6.4
-6.4
—
—
110
6.5
-6.5
+0.33
0.5
115
6.6
-6.6
—
2
—
mV/dB
mV/dB
%/°C
%
dB
Conditions
No Signal
No Signal
Min
—
—
—
-0.4
Typ
30
±4
175
0.0
Max
400
±15
750
+0.4
Min
—
—
—
-0.4
4301A
Typ
30
±4
175
0.0
Max
400
±15
750
+0.4
Units
pA
mV
mArms
dB
E
C+
=SYM=-375mV, E
C-
=+375mV 110
DV
OFF(OUT)
R
out
= 20kW
0 dB gain
+15 dB gain
+30 dB gain
—
—
—
—
20 Hz-20 kHz
R
out
= 20kW
0 dB gain
+15 dB gain
—
—
1
2
5
20
3
10
25
—
—
—
—
—
1
2
5
20
3
10
25
—
mV
mV
mV
mA
Gain Cell Idling Current
Output Noise
I
IDLE
e
n(OUT)
-96
-85
-94
-83
—
—
-96
-85
-94
-83
dBV
dBV
Total Harmonic Distortion
THD
V
IN
= 0 dBV, 1 kHz
0 dB gain
—
0.003 0.007
—
0.003 0.007
%
1. All specifications subject to change without notice.
2. Unless otherwise noted, T
A
=25°C, V
CC
= +15V, V
EE
= -15V; VCA
SYM
adjusted for min THD @ 1 V, 1 kHz, 0 dB gain.
3. 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
THAT 4301 Dynamics Processor IC
Page 3
SPECIFICATIONS
1 , 2
(Cont’d.)
VCA Electrical Characteristics
3
(Cont’d.)
Parameter
Symbol
Conditions
V
IN
= +10 dBV, 1 kHz
0 dB gain
–15 dB gain
V
OUT
= +10 dBV, 1 kHz
+15 dB gain
V
IN
= +19.5 dBV, 1 kHz
0 dB gain
Symmetry Control Voltage
V
SYM
minimum THD
—
—
-2.5
0.035 0.09
—
0
—
+2.5
—
—
-2.5
0.035 0.09
0.05
0
0.09
+2.5
%
%
mV
—
—
0.03
0.07
—
—
0.03
0.07
%
%
0.035 0.09
0.035 0.09
Min
4301
Typ
Max
Min
4301A
Typ Max
Units
Total Harmonic Distortion (cont’d.) THD
RMS Detector Electrical Characteristics
4
Parameter
Input Bias Current
Input Offset Voltage
Input Signal Current
Input Current for 0 V Output
Output Scale Factor
Symbol
I
B (RMS)
V
OFF(RMS In)
I
IN(RMS)
I
in0
E
O
/ 20log(I
in
/I
in0
)
I
T
= 7.5mA
31.6nA< I
IN
< 1mA
T
A
= 25°C (T
CHIP
»55°C)
Scale Factor Match (RMS to VCA)
-20 dB < VCA Gain < +20 dB
1mA<I
in
(DET)
<100mA
Output Linearity
f
IN
= 1kHz
1mA <
I
in
< 100mA
100nA <
I
in
< 316mA
31.6nA <
I
in
< 1mA
Rectifier Balance
f
IN
= 100 Hz,
t
= .001 s
1mA<
I
in
< 100mA
Crest Factor
1ms pulse repetition rate
0.2 dB error
0.5 dB error
1.0 dB error
Maximum Frequency for 2 dB Additional Error
I
in
³
10mA
I
in
³
3mA
I
in
³
300nA
Timing Current Set Range
Voltage at I
T
Pin
Timing Current Accuracy
Filtering Time Constant
Output Temp. Coefficient
Output Current
I
CT
/I
T
t
DE
o
/
DT
CHIP
I
OUT
I
T
I
T
= 7.5mA
I
T
= 7.5mA
T
CHIP
= 55°C
Re: T
CHIP
= 27°C
–300mV < V
OUT
< +300mV
—
±90
—
—
—
—
—
—
1.5
-10
0.90
3.5
5
10
100
45
7
7.5
+20
1.1
—
—
—
—
—
—
15
+50
1.30
s
—
—
%/°C
mA
kHz
kHz
kHz
mA
mV
–20
—
20
%
—
—
—
0.1
0.5
1.5
—
—
—
dB
dB
dB
.985
1
1.015
6.4
6.5
6.6
mV/dB
Conditions
No Signal
No Signal
Min
—
—
—
6
Typ
30
±4
175
8.5
Max
400
±15
750
12
Units
pA
mV
mA
mA
(
0.026
)
C
T
I
T
0.33
±100
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
Page 4
Rev. 04/10/02
Specifications
1 , 2
(Cont’d)
Opamp Electrical Characteristics
5
OA1
Parameter
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Voltage Range
Symbol
V
OS
I
B
I
OS
I
VR
R
S
<10k
VS=±7V to
±15V
(@50kHz)
R
L
=10k
R
L
=2k
Output Voltage Swing
V
O
@R
L
=5kW
V
O
@R
L
=2kW
Short Circuit Output Current
Slew Rate
Total Harmonic Distortion
SR
THD
—
—
—
Conditions
Min
—
—
—
Typ Max
±0.5
150
15
±6
500
50
Min
—
—
—
OA2
Typ Max
±0.5
150
15
±6
500
50
Min
—
—
OA3
Typ Max
±0.5
150
N/A
N/A
N/A
—
—
—
—
—
—
—
—
—
—
—
—
100
5
125
120
±14
±13
12
2
—
—
—
—
—
—
—
—
V
V
mA
V/ms
MHz
±6
500
Units
mV
nA
nA
V
—
±13.5
—
—
—
—
—
100
100
5
115
N/A
±13
N/A
4
2
—
—
—
—
—
—
—
—
±13.5
—
—
—
—
—
100
100
5
110
N/A
—
±13
N/A
—
—
4
2
—
—
—
—
Common Mode Rej. Ratio CMRR
Power Supply Rej. Ratio
Gain Bandwidth Product
Open Loop Gain
PSRR
GBW
A
VO
1kHz, A
V
=1, R
L
=10kW — 0.0007 0.003 — 0.0007 0.003 — 0.0007 0.003 %
1kHz, A
V
=–1, R
L
= 2kW
N/A
—
—
6.5
0.3
10
—
—
—
N/A
7.5
0.3
12
—
— 0.0007 0.003 %
—
—
7.5
0.3
12
—
nV
pA
Hz
Hz
Input Noise Voltage Density
Input Noise Current Density
e
n
i
n
f
O
=1kHz
f
O
=1kHz
5. Test circuit for opamps is a unity-gain follower configuration, with load resistor R
L
as specified.
+15V
R5
50K
SIGNAL
IN
-15V
VCA SYM
C2
R4
300K
47pF
C1
R1
20K0 1%
47uF
R3
51
R2
20K0 1%
SIGNAL
OUT
+15V
C7
-
OA1
IN
EC-
SYM
-
OA3
VCA
OUT
EC+
100n
+
VCC
VEE
+
C8
C3
47uF
100n
-15V
THAT4301
IN
It
RMS
+
OUT
Ct
GND
OA2
R6
10K0 1%
-
C6
22uF
R7
2M00
1%
C4
10uF
RMS
OUT
Ec-
-15V
Figure 2. VCA and RMS detector test circuit
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com
THAT 4301 Dynamics Processor IC
Page 5
Pin Name
RMS In
I
T
(I
Time
)
No Connection
RMS Out
C
T
(C
Time
)
OA2 -In
OA2 Out
OA2 +In
GND
VEE
VCC
OA3 Out
VCA Out
SYM
E
C+
DIP P in
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SO Pin
3
4
5
6
7
9
10
11
12
13
18
19
20
22
23
Pin Name
E
C-
VCA In
OA1 Out
OA1 -In
OA1 +In
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
DIP P in
16
17
18
19
20
SO Pin
24
25
26
27
28
1
2
8
14
15
16
17
21
29
30
Table 1. Pin Connections
E
1
F
B
A
G
Ordering Information
Plastic DIP
Plastic Surface Mount
4301P
4301S
4301PA
Inquire
0-10
H
C
D
J
K
N
L
M
P
I
B
1
C
I
O
D
F
A
E
H
G
J
0-15
ITEM
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
MILLIMETERS
24.8 Max.
24.2 +/-0.2
6.4 +/-0.2
7.62 +/-0.25
2.54 +/-0.15
0.46 +0.15 -0.1
1.0 +/-0.15
1.5 Typ.
0.98 Typ.
1.5
1.75
3.25 +/-0.15
4.7 Max.
0.51 Min.
2.8 Min.
0.25 +0.15 -0.05
INCHES
0.98 Max
0.95 +/-0.008
0.25 +/-0.008
0.30 +/-0.01
0.10 +/-0.006
0.02 +0.006 -0.004
0.04 +/-0.006
0.06 Typ.
0.04 Typ.
0.06
0.07
0.13 +/-0.006
0.19 Max.
0.02 Min.
0.11 Min.
0.01 +0.006 -0.002
ITEM
A
B
C
D
E
F
G
H
I
J
MILLIMETERS
15.4 +/- 0.3
7.5 +/- 0.2
10.3 +/- 0.4
0.4 + 0.1 - 0.05
1.0 Typ.
0.85 MAX.
2.3 +/- 0.15
0.15 +/- 0.1
0.8
0.2 + 0.1 - 0.05
INCHES
0.60 +/- 0.012
0.29 +/- 0.008
0.41 +/- 0.016
0.002 +0.004 -0.002
0.039 Typ.
0.033 Max.
0.09 +/- 0.006
0.006 +/- 0.004
0.031
0.008 +0.004 -0.002
Figure 3. Plastic dual in-line package outline
Figure 4. Plastic surface-mount 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
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