THAT5263 2-Channel Digitally-Controlled
Mic Preamp Demonstration Board
THAT
5263-DEMO
FEATURES
•
Demonstrates a complete 2 channel digitally-controlled microphone preamplifier
system based on THAT5263 IC
•
Controls gain of two microphone preamplifiers
•
Balanced main audio input/output on XLR connectors
•
Balanced TRS line input with -20dB pad
•
Switchable phantom power (with external +48V)
•
Supports pro audio signal levels: +26 dBu (input and output, ±15V supplies)
•
Gain adjustable in 3 dB steps from 0 dB to 51 dB
•
Easy to use PC Graphical User Interface software
•
Generous prototyping area
DESCRIPTION
The THAT 5263-DEMO Digitally-Controlled Mic
Preamp Demo Board allows developers to evaluate
the THAT5263 digital gain controller IC with THAT
differential output microphone preamplifiers. A fully-
featured microphone preamplifier is demonstrated
with phantom power switching and fault protection,
mic/line inputs, RFI filtering, and output conditioning.
The board is controlled by a user-friendly PC graph-
ical user interface over USB.
THAT1583
Preamp IC
U4
MIC IN
+48V
Phantom
Power
Phantom
Power
Fault
Protection
+
TP11
U5
Balanced
Output
Driver
LINE OUT
CHANNEL 2
-20 dB
Pad
TP16
U11, U13
RA_CH2 RG1_CH2
GPO_CH1
GPO_CH2
BSY_CH1
DIN
BSY_CH2
RA_CH1 RG1_CH1
IN1_CH1
IN2_CH1
RG2_CH1 RB_CH1
IN1_CH2
IN2_CH2
RG2_CH2 RB_CH2
SCLK
LINE IN
U12
USB
Controller
Module
To
Host
Computer
THAT5263
SPI
Interface
CS
DOUT
SPI
Control
Logic
Daisy
Chain
Headers
U1
LINE IN
-20 dB
Pad
TP1
CHANNEL 1
+48V
Phantom
Power
Phantom
Power
Fault
Protection
+
U2
THAT1580
Preamp IC
U3
MIC IN
Balanced
Output
Driver
LINE OUT
TP6
U10
R27 (0 Ohm)
3.3V
1
1
PP GND
Analog GND
Power Supply Connections
SW1
+48V
Phantom
Power
Control
PPGND
J6
+48V
J5
J8
V+
J9
GND
J10
V-
J7
+5V
5V
3.3V
Voltage
Regulator
Figure 1. THAT5263 Simplified Application Circuit
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2016, THAT Corporation; All rights reserved. Document 600191 Rev 01
THAT 5263-DEMO Datasheet
Page 2 of 16
Document 600191 Rev 01
Overview
The THAT5263 is a digital gain controller for low-
noise, analog, differential, current-feedback audio
preamplifiers.
When used in conjunction with an
appropriate analog gain block (e.g. THAT 1580 or 1583),
the 5263 can digitally control gain from 0dB to 51dB in
3dB steps, while preserving low noise and distortion. It
operates from ±5V to ±17V supplies, supporting input
signal levels as high as +27 dBu (at 0dB gain, ±17 V)
without an input pad.
The THAT5263-DEMO Board demonstrates the
5263 mated with the 1580 and 1583 mic preamplifier
ICs in a typical circuit. An easy to use USB Graphical
User Interface provides total control over all 5263
features. Developers can take advantage of the generous
prototyping area to customize the circuit for their own
application.
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2016, THAT Corporation; All rights reserved.
THAT 5263-DEMO Datasheet
Page 3 of 16
Document 600191 Rev 01
Connections
Power
The USB interface runs on USB bus power, but the
rest of the demo board requires an external power
supply. +/-15 V (maximum +/-17V) supplies the analog
circuitry. +48V phantom power is input (not generated
on the board) and switched on and off via the on-board
Phantom Power switch. Note that the ground return for
+48V phantom power is via the PPGND and connects to
the Analog ground via a zero ohm resistor. connector.
The +5V input is regulated on board to 3.3V and
supplies the digital logic.
USB
A PC must be plugged into the demo board via USB
in order to control parameters in the 5263. Take care
not to hot plug the demo board while the GUI software is
running as this will sometimes crash the Windows
drivers.
General Purpose Outputs (GPOA, GPOB) and
Busy Signal Outputs (BSYA, BSYB)
Each channel of the 5263 provides a GPO in addi-
tion to a digital busy signal (BSY). These pins are
connected to header P12 via small series resistors. The
GPOs are also connected to LEDs D10 and D11. The
LEDs can be enabled/disabled by the on-board DIP
switches SW2-1 and SW2-2. When enabled, these LEDs
can be controlled with the GPO check box on the GUI.
Audio Input
The Neutrik combo connector accepts an XLR or ¼"
TRS cable. The 1/4" TRS signal path includes a 20dB
pad in order to support line levels.
Audio Output
The Output XLR connector provides access to the
balance audio output signal. Please note that the
differential attenuator/ output buffers (U3/U5) add a
small amount of noise and distortion to the signal and it
is therefore recommended that test points TP10 - TP11
be used to measure performance of the mic preamp
circuit in isolation.
Connecting Multiple Demo Boards in Daisy
Chain Mode
Headers P9 and P10 provide easy access to the SPI
signals for linking multiple pairs of 5263 channels.
Please refer to the 5263 Data Sheet for complete details.
Note that the on-board DIP switches SW2-3 and SW2-4
control the Daisy Chain function. These switches must
to set to the OFF position (toward the left side of the
board) in order to insure proper operation in the normal
two channel mode.
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2016, THAT Corporation; All rights reserved.
THAT 5263-DEMO Datasheet
Page 4 of 16
Document 600191 Rev 01
Software Set-up and Operation
Download the latest 5362 Demo Board GUI software
from the THAT Corporation web site
In the .zip file you will find the GUI executable along
with other associated demo board documentation.
Simply un-zip the file and place the MicPre_v1_3.exe in
some convenient location on your PC.
Once the hardware has been set up as described
above, double click the MicPre.exe icon and the GUI
should appear:
indicating that the GUI is successfully talking to the
5263.
If the GUI fails to recognize the demo board (most
likely caused by a missing USB connection) you will see
the following error message:
Figure 3. 5263-DEMO software error message.
If this message appears, you can click OK and the
GUI will open, but there will be no connection to the
demo board. Once the source of the problem has been
resolved (i.e. Turn on the power or connect the missing
USB cable), use the Port=>Reconnect pull down to
establish communications.
The Port=>Reconnect pull down can be used any-
time to reestablish the USB link between the GUI and
demo board.
Select "Update immediately" or "Update on zero
crossings" from the Gain Mode and GPO Mode drop
down menus.
Move the gain slider to adjust gain of the 5263.
Gains are continuously adjusted as you move the slider.
You may also adjust the gain slider by first giving it
scope (clicking it with the mouse) and then pressing the
UP and DOWN arrow keys on your computer keyboard,
or by clicking the up or down arrow buttons next to the
numeric gain text box below the gain slider.
Jumper Options
T-Bias Jumpers, P4, P8
The input circuit provides jumpers (P4, P8) which
enable/disable the "T-Bias" function. With the shunts
installed, T-Bias is disabled and the circuit provides a
2kΩ differential input impedance to the XLR input. With
the shunts removed, T-Bias is enabled and provides a
high common mode impedance (ideal for both mic and
line inputs) but maintains a modest differential
impedance.
Figure 2. 5263-DEMO GUI
Next connect the GUI to the demo board by clicking
on the Port pull down menu at the top and selecting
Reconnect.
The small green LED on the USB module should
blink, indicating that communications have been
established. Try the GPO check boxes on the GUI and
the red LEDs on the demo board should light up,
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2016, THAT Corporation; All rights reserved.
Vcc
U1A
6 RA_CH1
IN1_CH1 5
RA
7 RG1_CH1
1M
8 RG2_CH1
9 RB_CH1
RB
IN2_CH1 10
R
G
+48V
R1
C4
1000u
R3
100R0
R6
2k00
2
THAT 5263-DEMO Datasheet
+48V
C1
47uF/63V
TP1
OUT1
1
SW1
5263 Marketing Demo Board
Analog Section, Channel 1
4
2
5
R2
1M2
3
6
49R9
D1
RED Phantom ON
Q1
+48V
Switched
DSS4320T-7
J1A
P2 Do not install P2 & P3
Open
C3
220p R7
2k00
1
P1
XLR-3CM
TP4
GND
TP3
OUT+
R11
1
3
2
R4
6k81
R5
6k81
Vcc
R10
100R0
D2
S1G
U2
THAT1580
C5
13
3
7
TP2
IN-
5263N24-U
Vcc
R12
2k00
P3
Open
C12
220p
R8
47K
C6
R13
100n
D3
R14 S1G
1k20
P4
OUT1
OUT2
15
R9
470
G2 3 1
13 2 4
3
XLR-F &
TRS combo
49R9
U3A
NJM4580
R15
2k00
C9
R16 33p
4k99
7
6
5
C7
22p
C13
220p
R18
4k99
R22
100R0
TP7
GND
U3B
NJM4580
R21
49R9
C18
22p
TP5
OUT
C10
22p
Vee
C15
220p
Vcc
R20
1k20
D4
S1G
17
47uF/63V 10R00
6
C8
100p
V+
C11
100n
IN1
RG1
Page 5 of 16
C14
220p
C16
R19
T-Bias
RG2 V- V-
2
10
IN2
12
47uF/63V 10R00
R17
10k00
C17
22p
R25
9k09
R24
9k09
R26
100R0
Vee
C21
C24
220p
10u
10u
TP10
IN+
R28
100k
C25
R27
100k
TP9
GND
D5
S1G
C20
100p
C19
100n
Vee
Appendix A. Schematic (1 of 3)
R23
2k49
TP6
OUT2
TP8
VCM
J1B
S
R
T
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2016, THAT Corporation; All rights reserved.
XLR-F &
TRS combo
C26 C27
22p 22p
Document 600191 Rev 01
京公网安备 11010802033920号
EEWORLD
