THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA

Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com

T H A T

C o r p o r a t i o n

THAT Analog Engine

IC Dynamics Processor

THAT 4301, 4301A

FEATURES

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

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

high-performance,

exponen-

tially-controlled

VCA,

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.

OUT

OA1

VCC

THAT4301

EC-

EC+

OUT

SYM

VCA

OA3

OA2

GND VEE

RMS

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

= 25°C)

Positive Supply Voltage (V

)

+18 V

Negative Supply Voltage (V

)

-18 V

Supply Current (I

)

20 mA

Power Dissipation (P

) (T

= 75°C)

700

Operating Temperature Range (T

)

0 to +70°C

Storage Temperature Range (T

)

-40 to +125°C

Overall Electrical Characteristics

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Positive Supply Voltage

+15

Negative Supply Voltage

-7

-15

Positive Supply Current

Negative Supply Current

-12

-18

Thermal Resistance

J-C

SO-Package

140

°C/W

VCA Electrical Characteristics

4301

4301A

Parameter

Symbol

Conditions

Min

Typ

Max

Min

Typ

Max

Units

Input Bias Current

B(VCA)

No Signal

400

Input Offset Voltage

OFF(VCA In)

No Signal

±4

±15

±4

±15

Input Signal Current

IN(VCA)

or I

OUT(VCA)

175

750

175

750

mArms

Gain at 0V Control

C+

= E

= 0.000V

-0.4

0.0

+0.4

-0.4

0.0

+0.4

Gain-Control Constant

= 25°C (T

CHIP

@ 55°C)

-60 dB < gain < +40dB

C+

/Gain (dB)

C+

& SYM

6.4

6.5

6.6

6.4

6.5

6.6

mV/dB

C-

/Gain (dB)

C-

-6.4

-6.5

-6.6

-6.4

-6.5

-6.6

mV/dB

Gain-Control TempCo

CHIP

Ref T

CHIP

= 27°C

+0.33

%/°C

Gain-Control Linearity

-60 to +40 dB gain

0.5

Off Isolation

C+

=SYM=-375mV, E

C-

=+375mV 110

115

110

115

Output Offset Voltage Change

OFF(OUT)

out

= 20k

0 dB gain

+15 dB gain

+30 dB gain

Gain Cell Idling Current

IDLE

Output Noise

n(OUT)

20 Hz-20 kHz

out

= 20k

0 dB gain

-96

-94

-96

-94

dBV

+15 dB gain

-85

-83

-85

-83

dBV

Total Harmonic Distortion

THD

= 0 dBV, 1 kHz

0 dB gain

0.003 0.007

1. All specifications subject to change without notice.
2. Unless otherwise noted, T

=25°C, V

= +15V, V

= -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

(Cont'd.)

4301

4301A

Parameter

Symbol

Conditions

Min

Typ

Max

Min

Typ

Max

Units

Total Harmonic Distortion (cont'd.) THD

= +10 dBV, 1 kHz

0 dB gain

0.03

0.07

0.03

0.07

15 dB gain

0.035 0.09

OUT

= +10 dBV, 1 kHz

+15 dB gain

0.035 0.09

= +19.5 dBV, 1 kHz

0 dB gain

0.05

0.09

Symmetry Control Voltage

SYM

minimum THD

-2.5

+2.5

-2.5

+2.5

RMS Detector Electrical Characteristics

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Input Bias Current

B (RMS)

No Signal

400

Input Offset Voltage

OFF(RMS In)

No Signal

±4

±15

Input Signal Current

IN(RMS)

175

750

Input Current for 0 V Output

in0

= 7.5

8.5

Output Scale Factor

/ 20log(

in0

)

31.6nA< I

< 1mA

= 25°C (T

CHIP

»55°C)

6.4

6.5

6.6

mV/dB

Scale Factor Match (RMS to VCA)

-20 dB < VCA Gain < +20 dB

mA<I

in (DET)

<100

.985

1.015

Output Linearity

= 1kHz

mA < I

< 100

0.1

100nA <

< 316

0.5

31.6nA <

< 1mA

1.5

Rectifier Balance

= 100 Hz,

t = .001 s

mA< I

< 100

Crest Factor

1ms pulse repetition rate

0.2 dB error

3.5

0.5 dB error

1.0 dB error

Maximum Frequency for 2 dB Additional Error

³ 10mA

100

kHz

³ 3mA

kHz

³ 300nA

kHz

Timing Current Set Range

1.5

7.5

Voltage at I

= 7.5

-10

+20

+50

Timing Current Accuracy

= 7.5

0.90

1.1

1.30

Filtering Time Constant

CHIP

= 55

°C

(

)

0 026

Output Temp. Coefficient

CHIP

Re: T

CHIP

= 27

°C

0.33

%/°C

Output Current

OUT

300mV < V

OUT

< +300mV

±90

±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

OA1

OA2

OA3

Parameter

Symbol

Conditions

Min

Typ

Max

Min

Typ

Max

Min

Typ

Max

Units

Input Offset Voltage

±0.5 ±6

±0.5

±6

±0.5 ±6

Input Bias Current

150

500

150

500

150

500

Input Offset Current

N/A

Input Voltage Range

±13.5 --

N/A

Common Mode Rej. Ratio

CMRR

<10k

100

N/A

Power Supply Rej. Ratio

PSRR

VS=

±7V to ±15V

100

Gain Bandwidth Product

GBW

(@50kHz)

MHz

Open Loop Gain

=10k

115

110

125

=2k

N/A

120

Output Voltage Swing

=5k

±13

±14

=2k

N/A

±13

Short Circuit Output Current

Slew Rate

Total Harmonic Distortion

THD

1kHz, A

=1, R

=10k

W -- 0.0007 0.003 -- 0.0007 0.003 -- 0.0007 0.003 %

1kHz, A

=1, R

= 2k

N/A

-- 0.0007 0.003

Input Noise Voltage Density

=1kHz

6.5

7.5

nV Hz

Input Noise Current Density

=1kHz

0.3

pA Hz

50K

47uF

10uF

22uF

300K

47pF

10K0

47uF

2M00

100n

OA2

OA1

VEE

VCC

GND

VCA

VCA SYM

SIGNAL

Ec-

OUT

SIGNAL

OUT

RMS

+15V

-15V

20K0

THAT4301

RMS

SYM

OUT

EC-

EC+

OA3

OUT

Figure 2. VCA and RMS detector test circuit

5. Test circuit for opamps is a unity-gain follower configuration, with load resistor R

as specified.

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

DIP P in

SO Pin

RMS In

Time

)

No Connection

RMS Out

Time

)

OA2 -In

OA2 Out

OA2 +In

GND

VEE

VCC

OA3 Out

VCA Out

SYM

C+

Pin Name

DIP P in

SO Pin

C-

VCA In

OA1 Out

OA1 -In

OA1 +In

No Connection

Table 1. Pin Connections

C
D

ITEM

A
B
C
D
E

G
H

M
N
O

MILLIMETERS

INCHES

24.8 Max.

0.98 Max

24.2 +/-0.2

0.95 +/-0.008

6.4 +/-0.2

0.25 +/-0.008

7.62 +/-0.25

0.30 +/-0.01

2.54 +/-0.15

0.10 +/-0.006

0.46 +0.15 -0.1

0.02 +0.006 -0.004

1.0 +/-0.15

0.04 +/-0.006

1.5 Typ.

0.06 Typ.

0.98 Typ.

0.04 Typ.

1.5

0.06

1.75

0.07

3.25 +/-0.15

0.13 +/-0.006

4.7 Max.

0.19 Max.

0.51 Min.

0.02 Min.

2.8 Min.

0.11 Min.

0.25 +0.15 -0.05

0.01 +0.006 -0.002

0-15

Figure 3. Plastic dual in-line package outline

+ 0.1 - 0.05

Typ.

+/- 0.2

+ 0.1 - 0.05

+/- 0.4

+/- 0.3

0.2

0.8

0.15

2.3

0.85 MAX.

1.0

0.4

10.3

7.5

15.4

MILLIMETERS

ITEM

+/- 0.1

+/- 0.15

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

0-10

Figure 4. Plastic surface-mount package outline

Ordering Information

Plastic DIP

4301P

4301PA

Plastic Surface Mount

4301S

Inquire

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