Audio Preamplifier
Digital Controller IC
THAT
5173
FEATURES
•
•
•
•
•
•
•
•
•
•
Wide gain range: 0 to 60dB in 3dB steps
Wide supply range: ±5V to ±17V
Wide output swing: +27dBu (±17V sup.)
Wide input swing: +27dBu (±17V sup.)
Low THD+N: <0.001% @ 1kHz,
up to 42dB gain
Integrated differential servo minimizes
output offset
Zero-crossing detector minimizes
switching noise
Daisy Chainable SPI interface
Four general-purpose digital outputs
Small 5mm x 5mm QFN24 package
APPLICATIONS
•
Digitally controlled microphone
preamplifiers
•
Digitally controlled instrumentation
amplifiers
•
Digitally controlled differential
amplifiers
•
Audio mixing Consoles
•
PC audio breakout boxes
•
Audio distribution systems
•
Digital audio snakes
•
Portable audio recorders
Description
The THAT5173 is a digital gain controller for
low-noise, analog, differential, current-feedback
audio preamplifiers such as the THAT 1580 and
1583. When used in conjunction with an
appropriate analog gain block, the 5173 supports
digitally controlled gain from 0dB to 60dB in 3dB
steps, while preserving low noise and distortion. It
operates from ±5V to ±17V analog supplies,
supporting input signal levels as high as +27 dBu
(at 0dB gain and ±17V supplies) in combination
with the 1580 or 1583 -- without an input pad. The
5173 includes a differential servo and zero-crossing
detector to minimize dc offsets and glitches (zipper
noise) during gain adjustments.
The 5173 is controlled via an industry
standard serial-peripheral interface (SPI) port. Four
General Purpose Outputs (GPOs) can be controlled
via this interface. The GPOs may be used to control
auxiliary functions such as input selectors, filters,
mutes, LEDs, relays, etc.
The 5173 was designed to mate perfectly with
the THAT 1580 and 1583 Differential Audio
Preamplifier ICs. Together, these combinations
provide a high performance solution for digitally-
controllable
audio
preamplifier
applications.
However, the 5173 may also be used to control a
discrete preamplifier.
Fabricated in a high-voltage CMOS process, the
5173 integrates an astonishing amount of circuitry
within a very small package. It comes in a small
(5x5 mm) 24-pin QFN package, making it suitable
for small portable devices.
TRC
DGnd
RST
BSY
Vdd
IN2
AGnd
Rg2
SCAP1
SOUT2
Figure 1. THAT 5173 Block Diagram
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478-9200; Fax +1 508 478-0990; Web:
www.thatcorp.com
Copyright © 2017, THAT Corporation; Document 600166 Rev 04
SOUT1
SCAP2
DOUT
DIN
SCLK
CS
GPO3
GPO2
GPO1
GPO0
Rg1
IN1
THAT 5173
Audio Preamplifier Digital Controller IC
Page 2 of 20
Document 600166 Rev 04
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Thermal
Pad
Pin Name
SCAP2
RG1
IN1
IN2
RG2
RST’
CS’
SCLK
DIN
TRC
VDD
DGND
DOUT
BSY
GPO0
GPO1
GPO2
GPO3
VEE
VCC
AGND
SOUT1
SOUT2
SCAP1
PAD
Pin Description
DC Servo Capacitor Input 2
Attenuator Network Output 1 [Connects to preamplifier feedback 1 (RG1)]
Attenuator Network Input 1 [Connects to preamplifier Output 1]
Attenuator Network Input 2 [Connects to preamplifier Output 2]
Attenuator Network Output 2 [Connects to preamplifier feedback Input 2 (RG2)]
Reset Input (Active Low)
Chip Select Input (Active Low)
Serial Clock Input
Serial Data Input
R/C Timeout or External Clock Input
Logic Positive Power Supply
Logic Ground Reference
Serial Data Output
Busy Output (Active High)
General Purpose Output 0
General Purpose Output 1
General Purpose Output 2
General Purpose Output 3
Negative Analog Supply Voltage
Positive Analog Supply Voltage
Analog Ground Reference
DC Servo Output 1
DC Servo Output 2
DC Servo Capacitor Input 1
Connected internally to V
EE
. Solder to PCB (optionally connect to V
EE
) for optimal
performance.
Table 1. Pin Assignments
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478-9200; Fax +1 508 478-0990; Web:
www.thatcorp.com
Copyright © 2017, THAT Corporation; All rights reserved.
THAT 5173
Audio Preamplifier Digital Controller IC
Page 3 of 20
Document 600166 Rev 04
SPECIFICATIONS
1
Absolute Maximum Ratings
2,3
Total Analog Supply Voltage (V
CC
-V
EE
)
Positive Analog Supply Voltage (V
CC
-A
GND
)
Negative Analog Supply Voltage (V
EE
-A
GND
)
Digital Supply Voltage (V
DD
-V
DGND
)
Analog and Digital Ground Difference (D
GND
-A
GND
)
Maximum Analog Voltage at IN1, IN2 (V
iAMAX
)
Maximum Current Through V
DD
, D
GND
36 V
18 V
-18 V
4.5 V
±0.3 V
V
CC
100 mA
Minimum Analog Voltage at IN1, IN2 (V
iAMIN
)
Maximum Digital Input Voltage (V
IDMax
)
Minimum Digital Input Voltage (V
IDMin
)
Storage Temperature Range (T
STG
)
Operating Temperature Range (T
OP
)
Junction Temperature (T
JMAX
)
V
EE
V
DD
+ 0.3 V
D
GND
- 0.3 V
-40 to +125 ºC
-40 to +85 ºC
+125 ºC
Elec trical Characteristics
2,4
Parameter
Power Supply
Analog Supply Voltage
Digital Supply Voltage
Analog Supply Current
Digital Supply Current
V
CC
; -V
EE
V
DD
I
CC
; -I
EE
I
DD
Referenced to A
GND
Referenced to D
GND
No Signal
No Signal
4.75
3.0
—
—
—
—
7.6
2
17
3.6
10
11
V
V
mA
µA
Symbol
Conditions
Min.
Typ.
Max.
Units
Resistor Ladder Characteristics (DC)
Gain Range
[-20log (V
IN1
-V
IN2
)/(V
RG1
-V
RG2
)]
Gain Step Size
Gain Error
R
G
Range (Resistance from IN
1
to IN
2
)
R
A
, R
B
Range (Resistance from IN
1
to Rg
1
)
(Resistance from IN
2
to Rg
2
)
Servo Amp Characteristics (DC)
Input Offset Voltage
Power Supply Rejection Ratio
Maximum Output Voltage
Minimum Output Voltage
Maximum Output Current
1
2
3
V
CC
– 1.6 > V
IN1
> V
EE
+ 1.6
V
CC
– 1.6 > V
IN2
> V
EE
+ 1.6
0dB ≤ Gain ≤ 60dB
All gain settings
All gain settings
All gain.settings
0
—
-0.5
13.7
2.0
—
3
±0.2
60
—
0.5
dB
dB
dB
Ω
kΩ
17.1~12.1k open
2.5~8.6
10.3
V
OS
PSRR
V
OMax
V
OMin
I
OMax
Includes bias current effects
V
CC
= -V
EE
; ±5V to ±15V
-1.75
100
V
CC
-4.5
—
0.70
—
115
—
—
1.0
+1.75
—
—
V
EE
+4.5
—
mV
dB
V
V
mA
All specifications subject to change without notice.
Unless otherwise noted, T
A
= 25°C, V
CC
= +15V, V
EE
= -15V, V
DD
= +3.3V.
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only; the
functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
0 dBu = 0.775 Vrms
4
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478-9200; Fax +1 508 478-0990; Web:
www.thatcorp.com
Copyright © 2017, THAT Corporation; All rights reserved.
THAT 5173
Audio Preamplifier Digital Controller IC
Page 4 of 20
Document 600166 Rev 04
Elec trical Characteristics ( con 't)
Parameter
Symbol
Conditions
Min.
1,3,4
Typ.
Max.
Units
Zero-Crossing Detector Characteristics (DC)
Zero-Crossing Detector Threshold
ZCD Timeout
ZCD Timing Capacitor
ZCD Timing Resistor
AC Characteristics
THD+N (Differential signal applied to f = 1 kHz, Gain = 21 dB,
IN
1
, IN
2
, measured at RG
1
, RG
2
) V
IN1
- V
IN2
< = +22 dBu
Maximum Signal Voltage at IN
1
, IN
2
Minimum Signal Voltage at IN
1
, IN
2
Maximum Signal Voltage at RG
1
, RG
2
Minimum Signal Voltage at RG
1
, RG
2
—
0.001
—
%
t
ZTO
C
T
R
T
1k
R
T
= 22MΩ, C
T
= 1 nF
—
—
±12.5
22
1
22M
—
—
2
100M
mV
ms
nF
Ω
—
—
—
—
V
CC
- 2.5
V
EE
+ 2.5
V
CC
- 2.5
V
EE
+ 1.5
—
—
—
—
V
V
V
V
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478-9200; Fax +1 508 478-0990; Web:
www.thatcorp.com
Copyright © 2017, THAT Corporation; All rights reserved.
THAT 5173
Audio Preamplifier Digital Controller IC
Page 5 of 20
Document 600166 Rev 04
Elec trical Characteristics ( con 't)
Parameter
Digital I/O and Switching Characteristics
High-Level Input Voltage
Low-Level Input Voltage
High-Level Output Voltage at Io = 4 mA
Low-Level Output Voltage at Io = - 4 mA
Input Leakage Current
Input Capacitance
SCLK Frequency
SCLK Low Time
SCLK High Time
DIN to SCLK Rising Setup
SCLK Rising to DIN Hold Time
Enabled to SCLK High
Release to CS Active
Enabled to DOUT Active
Release to DOUT Tristate
SCLK Falling to DOUT Valid
High Time Between Transmissions
Release to SCLK Rising
f
SCK
t
SCL
t
SCH
t
DSU
t
DH
t
CSCR
t
SRS
t
CSDA
t
CSDH
t
CFDO
t
CSH
t
CSRCR
V
IH
V
IL
V
OH
V
OL
I
in
0.7 x V
DD
–
0.8 x V
DD
–
–
–
–
40
40
15
15
50
100
100
5
–
25
100
Symbol
Min.
1,3,4
Typ.
Max.
Units
–
–
–
–
2
3.5
–
–
–
–
–
–
–
–
–
–
–
–
–
0.3 x V
DD
–
0.4
–
–
10
–
–
–
–
–
–
–
20
15
–
–
V
V
V
V
µA
pF
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
ns
RST
t
SRS
t
CSH
CS
t
CSCR
SCLK
t
SCH
t
SCL
t
CSRCR
t
DSU
DIN
t
DH
t
CSDH
t
CSDA
DOUT
t
CFDO
Figure 2. SPI Timing
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478-9200; Fax +1 508 478-0990; Web:
www.thatcorp.com
Copyright © 2017, THAT Corporation; All rights reserved.
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