Pre-trimmed Low-voltage Low-power
Analog Engine® Dynamics Processor IC
THAT
4320
FEATURES
• Pre-trimmed VCA & RMS detector
• Wide supply voltage range: 4.5V~16V
• Low supply current: 3.7mA typ. (5V)
• Four opamps
• One low-noise opamp (<5nV/rt-Hz)
• On board PTAT reference
• Wide dynamic range: 120dB as
compander
APPLICATIONS
• Companding noise reduction
• Wireless microphones
• Wireless instrument packs
• Wireless in-ear monitors
• Battery operated dynamics processors
• Compressors
• Limiters
• AGCs
• De-essers
Description
The THAT4320 is a single-chip Analog Engine®
optimized for low-voltage, low-power operation. Incor-
porating a high-performance voltage- controlled ampli-
fier (VCA), RMS-level sensor, and four opamps, the
surface mount part is aimed at battery-operated audio
applications such as wireless microphones, wireless
instruments and in-ear monitors. The 4320 operates
from a single supply voltage down to +4.5Vdc, drawing
only 3.7mA.
This IC also works at supply voltages up to 16Vdc,
making it useful in line-operated products as well. The
VCA is pre-trimmed at wafer stage to deliver low distor-
tion without further adjustment. And, one opamp is
quiet enough to be used as a microphone preamp.
The part was developed specifically for use as a
companding noise reduction system, drawing from
THAT’s long history and experience with dbx®
technology for noise reduction. However, with 22 active
pins, the part is extremely flexible and can be configured
for a wide range of applications including single and
multi-band companders, compressors, limiters, AGCs,
de-essers, etc.
What really sets the 4320 apart is the transparent
sound of its Blackmer® VCA coupled with its accurate
true-RMS level detector. The IC is useful in battery-
powered mixers, compressor/limiters, ENG devices and
other portable audio products. The part is highly
integrated and requires minimal external support
circuitry: it even contains an on-board PTAT (propor-
tional to absolute temperature) voltage
reference to
generate thermally compensated control voltages for
thresholds and gain settings.
27 26
25
23
21
20
18
17
16
OUT
IN
V
EE
VCA
EC-
OA3
V
CC
EC+
28
THAT
4320
RMS
IN
CT
OUT
15
13
V
CC
/2 Buffer
1
14
V
PTAT
V
REF
GND
2
3
4
6
7
8
9
11
Figure 1. THAT4320 equivalent block diagram (QSOP-28 pin assignments shown)
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Email: info@thatcorp.com; Web: www.thatcorp.com
Copyright © 2015, THAT Corporation; Document 600045 Rev 08
Document 600045 Rev 08
Page 2 of 16
THAT4320 Pre-trimmed Low-voltage Low-power
Analog Engine® Dynamics Processor IC
SPECIFICATIONS
Absolute Maximum Ratings
1
Positive Supply Voltage (V
CC
)
Supply Current (I
CC
)
Operating Temperature Range (T
OP
)
Junction Temperature (T
J
)
Output Short-Circuit Duration
+18V
30mA
-40 to +85 ºC
-40 to +125 ºC
30 sec
Power Dissipation (P
D
) at T
A
=85 ºC
400mW
Input Voltage
Supply Voltage
-40 to +125 ºC
Storage Temperature Range (T
ST
)
Lead Temperature Range (Soldering, 10 sec)
300 ºC
Electrical Characteristics
2
Parameter
Power Supply
Positive Supply Voltage
Negative Supply Voltage (OA
1
)
Resistive Divider Voltage
Supply Current
V
CC
V
EE
V
PIN13
I
CC
Referenced to GND
OA
1
only
When overridden by split supply
No Signal
V
CC
=+5 V
V
CC
=+15 V
I
EE
Voltage Controlled Amplifier (VCA)
Max. I/O Signal Current
i
IN(VCA)
+ i
OUT(VCA)
V
CC
= +5 V
V
CC
= +15 V
Gain at 0V Control
3
Gain-Control Constant
Gain-Control Tempco
G
0
E
C+
/Gain (dB)
∆E
C
/∆T
CHIP
0V at +IN of OA
2
-60 dB < gain < +40 dB
Ref T
CHIP
=27ºC
R
OUT
= 20 kΩ
0 dB gain
+15 dB gain
+30 dB gain
Output Noise
e
N(OUT)
0 dB gain
22Hz~22kHz, R
IN
=R
OUT
=20 kΩ
Total Harmonic Distortion
3
RMS Level Detector
Output Voltage at Reference i
IN
e
O(0)
i
IN
= 7.5 µA RMS
i
IN
= 200 nA RMS
i
IN
= 1 mA RMS
-8
0
1
1
+8
3
3
mV
dB
dB
THD
V
IN
= -5dBV, 1kHz, 0V at +IN of OA
2
-
-98
0.05
-95
0.1
dBV
%
-
-
-
1
3
10
15
30
50
mV
mV
mV
-1.5
-
-
500
1
0
6.0
+0.33
+1.5
-
-
µA
peak
mA
peak
dB
mV/dB
%/ºC
V
CC
=+5V, V
EE
=-5 V
3.7
5
0.6
6
10
-
mA
mA
mA
+4.5
V
CC
-16
V
CC
- 8
-
0
V
CC
/ 2
+16
0
GND + 8
V
V
V
Symbol
Conditions
Min
Typ
Max
Units
Output Offset Voltage Change
4
∆
V
OFF(OUT)
Output Error at Input Extremes e
O(RMS)error
1. If the devices are subjected to stress above the Absolute Maximum Ratings, permanent damage may result. Sustained operation at or
near the Absolute Maximum Ratings conditions is not recommended. In particular, like all semiconductor devices, device reliability
declines as operating temperature increases.
2. Unless otherwise noted, T
A
=25ºC, V
CC
=+5V, V
EE
=0 V. Test circuit is as shown in Figure 2.
3. Assumes OA
2
is configured for unity gain, & includes offset voltage of OA
2
.
4. Reference is to output offset with -80 dB VCA gain.
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Email: info@thatcorp.com; Web: www.thatcorp.com
Copyright © 2015, THAT Corporation
Document 600045 Rev 08
Page 3 of 16
THAT4320 Pre-trimmed Low-voltage Low-power
Analog Engine® Dynamics Processor IC
Electrical Characteristics (con’t)
2
Parameter
Scale Factor Match to VCA
Symbol
Conditions
-20 dB < VCA gain < +20 dB
1 µA< i
IN(RMS)
< 100 µ A
Rectifier Balance
Timing Current
Filtering Time Constant
Output Tempco
Load Resistance
Capacitive Load
Operational Amplifier OA
15
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Common Mode Range
V
OS
I
B
I
OS
V
ICR+
V
ICR-
Equivalent Input Noise Voltage
Equivalent Input Noise Current
Gain Bandwidth Product
Slew Rate
Open Loop Gain
Output Short Circuit Current
e
N(IN)
i
N(IN)
GBW
SR
A
VOL
I
SC+
I
SC-
Output Voltage Range
V
O+
V
O-
Capacitive Load
Power Supply Rejection Ratio
C
L
PSRR
+5 V < V
CC
-V
EE
< +15V
-
105
f = 1 kHz
f = 1 kHz
f = 50 kHz
G = +10, C
L
= 100 pF
R
L
= 10 kΩ
Output to V
CC
/2, V
ID
= +0.4 V
Output to V
CC
/2, V
ID
= -0.4 V
R
L
= 10 kΩ to V
CC
/2, G = +10
-
-
-
4
-
-
-
-
2.3
-
-2.3
1.5
±1
500
± 30
4.3
0.4
4.5
0.9
13
4
95
-6.5
3.7
± 3.5
1200
± 120
-
0.6
6
-
-
-
-
-20
12
-
mV
nA
nA
V
V
nV/√Hz
pA/√Hz
MHz
V/μs
dB
mA
mA
V
V
pF
dB
I
T
τ
∆E
O
/∆T
CHIP
R
L
C
L
Ref T
CHIP
= 27 ºC
-250mV < V
OUTRMS
< +250mV, re:Vref
-
2
150
±7.5mA DC
IN
-
.95
1
±1
7.5
3467 X C
TIME
+0.33
-
-
1.05
-
dB
µA
s
%/ºC
kΩ
pF
Min
Typ
Max
Units
V
CC
-0.9 V
CC
-0.75
V
EE
+0.75 V
EE
+0.95
150
-
Operational Amplifier OA
2
(Control Voltage Buffer)
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Common Mode Range
Equivalent Input Noise Voltage
Equivalent Input Noise Current
Gain Bandwidth Product
Slew Rate
V
OS
I
B
I
OS
V
ICR
e
N(IN)
i
N(IN)
GBW
SR
f = 1 kHz
f = 1 kHz
f = 50 kHz, C
L
= 100 nF, R
L
= 10 kΩ
G = +1
-
-
-
-1
-
-
-
8
0.6
0.012/C
L
I
SC
/C
L
± 1.5
450
± 25
±6
1000
± 100
+1
-
-
-
-
mV
nA
nA
V
nV/√Hz
pA/√Hz
Hz
V/µs
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Email: info@thatcorp.com; Web: www.thatcorp.com
Copyright © 2015, THAT Corporation
Document 600045 Rev 08
Page 4 of 16
THAT4320 Pre-trimmed Low-voltage Low-power
Analog Engine® Dynamics Processor IC
Electrical Characteristics (con’t)
2
Parameter
Open Loop Gain
Symbol
A
VOL
Conditions
R
L
= 10 kΩ
Min
-
Typ
57.5
20*log(.075*RI)
Output Short Circuit Current
I
SC+
I
SC-
Power Supply Rejection Ratio
Capacitive Load
6
PSRR
C
L
Output to V
CC
/2, V
ID
= +0.4 V
Output to V
CC
/2, V
ID
= -0.4 V
+5 V < V
CC
< +15 V
-
-
-
22
-4
2.7
88
-
-
-
Max
Units
dB
dB
mA
mA
dB
nF
Operational Amplifier OA
3
(VCA Current-to-Voltage Converter)
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Common Mode Range
Equivalent Input Noise Voltage
Equivalent Input Noise Current
Gain Bandwidth Product
Slew Rate
Open Loop Gain
Output Short Circuit Current
V
OS
I
B
I
OS
V
ICR
e
N(IN)
i
N(IN)
GBW
SR
A
VOL
I
SC+
I
SC-
Output Voltage Range
V
O+
V
O-
Capacitive Load
Operational Amplifier OA
4
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Common Mode Range
V
OS
I
B
I
OS
V
ICR+
V
ICR-
Equivalent Input Noise Voltage
Equivalent Input Noise Current
Gain Bandwidth Product
Slew Rate
Open Loop Gain
e
N(IN)
i
N(IN)
GBW
SR
A
VOL
f = 1 kHz
f = 1 kHz
f = 50 kHz
G = +10, C
L
= 100 pF
R
L
= 10 kΩ
-
-
-
4
-
-
-
-
2.0
-
± 1.5
200
± 10
4.3
0.4
10.5
0.3
7.3
3.2
92
±5
500
± 50
-
0.6
14
-
-
-
-
mV
nA
nA
V
V
nV/√Hz
pA/√Hz
MHz
V/μs
dB
C
L
R
L
= 10 kΩ to V
CC
/2, Rf = 20 kΩ, 0 dB VCA gain
I
in(VCA)
= +100
μA
I
in(VCA)
= -100
μA
4.1
4.25
0.75
-
0.9
150
V
V
pF
f = 1 kHz
f = 1 kHz
f = 50 kHz
C
L
= 100 pF
R
L
= 10 kΩ
Output to V
CC
/2
-
-
-
-
-
-
± 1.5
200
mV
nA
Only one input is accessible
Not meaningful
10.5
0.3
7.3
3.2
92
-3.5
2.5
-
-
-
-
-
-
-
nV/√Hz
pA/√Hz
MHz
V/μs
dB
mA
mA
5. OA
1
is stable for closed-loop gains of 2 or greater.
6. Note - OA
2
and the V
CC
/2 buffer require a capacitve load for stability.
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Email: info@thatcorp.com; Web: www.thatcorp.com
Copyright © 2015, THAT Corporation
Document 600045 Rev 08
Page 5 of 16
THAT4320 Pre-trimmed Low-voltage Low-power
Analog Engine® Dynamics Processor IC
Electrical Characteristics (con’t)
2
Parameter
Output Short Circuit Current
Symbol
I
SC+
I
SC-
Output Voltage Range
V
O+
V
O-
Capacitive Load
Power Supply Rejection Ratio
V
CC
/2 Reference Buffer
Reference Voltage
V
REF
No Signal, No load on pin 13,
V
CC
= +5 V, R
L
= 3 kΩ to V
CC
or GND
V
CC
= +15 V
Voltage Divider Impedance
Output Short Circuit Current
R
A
, R
B
I
Osc-
I
Osc+
Output Noise Voltage
Capacitive Load
6
e
N(OUT)
C
L
Output to V
CC
Output to GND
22 Hz ~ 22 kHz, C
FILT
= 22
μF
-
22
2.4
-
-
2.5
V
CC
/2
20
-3
4.5
-120
-117
2.6
-
-
V
V
kΩ
mA
mA
dBV
nF
C
L
PSRR
+5V < V
CC
< +15 V
-
100
Conditions
Output to V
CC
/2, V
ID
= +0.4 V
Output to V
CC
/2, V
ID
= -0.4 V
R
L
= 10 kΩ to V
CC
/2, G = +10
Min
-1.3
1
4.1
Typ
-3.5
2.5
4.25
0.75
Max
-12
8
-
0.9
150
-
Units
mA
mA
V
V
pF
dB
Proportional To Absolute Temperature (PTAT) Voltage Generator
Output Voltage
V
PTAT
R
L
= 10 kΩ, T
CHIP
= 25 ºC
V
PTAT
applied to OA
2
, A
V
= +1
VCA Gain at 1 kHz
Output Tempco
Maximum Sink Current
Capacitive Load
∆(V
PTAT
-V
REF
)/∆T
CHIP
I
SINK(MAX)
C
L
Ref T
CHIP
= 27 ºC
-11
-
800
150
-12
+0.33
-13
-
dB
%/ºC
µA
pF
-
V
REF
- 0.072
-
V
VCA Gain Change Caused by V
PTAT
Performance as a Compander
7
(through an encode-decode cycle)
Dynamic Range
Distortion
Frequency response
THD
-20 dB re: Max Signal
(Max signal level) - (No Signal Output Noise)
f = 1 kHz
20 Hz ~ 20 kHz
120
0.1
± 1.5
dB
%
dB
Package Characteristics
Parameter
Surface Mount Packages
Thermal Resistance
θ
JA
Symbol
Conditions
See page 16 for pinouts and dimensions
Package soldered to board.
Thermal pad not soldered on QFN
8
90
70
ºC/W
QSOP-28 QFN-24
Units
Environmental Regulation Compliance
Soldering Reflow Profile
Moisture Sensitivity Level
Complies with July 21,2011 RoHS 2 Requirements
JEDEC JESD22-A113-D (260 ºC)
Above-referenced JEDEC soldering profile
MSL-1
MSL-1
7. Compressor circuit is as shown in Figure 12, Expander circuit is as shown in Figure 13.
8. For best VCA THD performance, QFN thermal pad should not be soldered to the PCB.
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Email: info@thatcorp.com; Web: www.thatcorp.com
Copyright © 2015, THAT Corporation
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