Phoenix Audio Technologies MT103E-HD User manual

Phoenix Audio Technologies, 16 Goodyear Suite 120, Irvine, CA 92618; Tel [phone]
Fax [phone]
www.phnxaudio.com
The MT103E-HD is a DSP based, dual microphone, stereo echo cancelling daughter board.
Features
The MT103E-HD is a dual microphone, single output, stereo, 16KHz Noise Canceling / Echo Canceling solution
The MT103E-HD utilizes your own microphone and own loudspeaker. It provides both analog and digital
outputs
Both the microphone(s) and the far-end inputs are connected through a 0.1” pitch header. User can design the
board to mount on its motherboard with mating connector, or connect to the MT103 through wires
Controllable input level and phantom power supply via free downloadable utility
Analog output through a 0.1” pitch header. User can design the board to mount on its motherboard with
mating connector, or connect to the MT103 through wires. digital output through USB connection
Phoenix’s proprietary echo canceling, noise canceling, and AGC algorithms with no gating, to prevent the loss
of critical information
MT103E-HD Dual Microphone 16KHz Echo Canceling
System

Phoenix Audio Technologies, 16 Goodyear Suite 120, Irvine, CA 92618; Tel [phone]
Fax [phone]
www.phnxaudio.com
Specifications
32KHz sampling frequency; 100Hz-16KHz bandwidth
Two levels of Echo Canceling aggressiveness and three levels of Echo Canceling speed
Controllable tail length –up to 220 ms.
Residual noise suppressed to the environment noise level to prevent pumping noise
Eight preset color filters for both the output and the speaker signal
Low latency (10msec)
Microphone inputs connected to pins 1 and 2 of J1. The following microphone settings are available using the
setup software:
oMic level (280mV peak-to-peak)
oLine level (2V peak-to-peak)
oadd 6dB boost
oOptional 2.8V power supply (phantom) , via 1Kohm resistor
*Units are preset to Mic level without 6dB boost; Phantom On
Note: user can use a single microphone connected to either pin 1 or pin 2 of J1
oFar-end inputs connected to pin 3 and pin 4 of J1. The input setting is Line level (2V peak-to-peak)
Notes:
1) Far-End input will be received through the USB channel if it’s active
2) Only one far-end signal is required; the two inputs will support stereo loudspeaker systems
System Output connected to the pin11 of J1. The following output settings are available using the setup
software:
oLine level: 2V peak-to-peak
oMic level: 200mV peak-to-peak
*Units are preset to Line level
Note: Output will be transmitted through the USB channel if it’s active
Speakers –(Far-end out signal) is connected to pin 13 and pin 14 of J1. The output setting is Line level: 2V
peak-to-peak

Phoenix Audio Technologies, 16 Goodyear Suite 120, Irvine, CA 92618; Tel [phone]
Fax [phone]
www.phnxaudio.com
How to Connect:
Digital connector (J2)
Reset
Shut Down
Analog connector (J1)
Microphone input
Far end inputs
Analog outputs
Backup Reboot
USB
Power Indicator LED
Power
5V
DGND
Alt Power (J6)

Phoenix Audio Technologies, 16 Goodyear Suite 120, Irvine, CA 92618; Tel [phone]
Fax [phone]
www.phnxaudio.com
Analog Connector (J1) Pin Definition
Pin
Name
Function
Level
Rating
1
IN1
Mic 1 In
Mic/Line
Mic = 140/280 mV ptp
Phantom 1K 2.8V
Line = 2/4V ptp
Input Impedance 24K
AC Coupled
Max Rating 4Vptp
2
IN2
Mic 2 In
Mic/Line
3
IN3
Far End 1 In
Line
Line = 2V ptp
Input Impedance 24K
AC Coupled
Max Rating 4Vptp
4
IN4
Far End 2 In
Line
5
IN5
NA
Max Rating 4Vptp
6
IN6
NA
Max Rating 4Vptp
7
3.3V
OUT
8
AGND
AGND
Input Amp Ground
9
AD0
10 bit A/D converter
AD0
Input level 0V-3V
Maximum Rating 4.5V
10
AGND
AGND
Output Amp Ground
11
OUT1
System Out
Mic/Line
12
OUT2
NA
Line
13
OUT3
SPKL (FarEnd out)
Line
Line = 2V ptp
14
OUT4
SPKR (FarEnd out)
Line
Line = 2V ptp

Phoenix Audio Technologies, 16 Goodyear Suite 120, Irvine, CA 92618; Tel [phone]
Fax [phone]
www.phnxaudio.com
GND connection recommendation
Improper GND connection can generate unwanted ground noise. In most cases we
recommend that you connect both analog grounds (pin 8 and 10) to your motherboard’s
power supply ground –and short the two as close as possible to the source (motherboard).
Digital Connector (J2) Pin Definition
Pin
I/O
Function
Notes
Nominal Rating
Max Rating
1
I
N/A
Pulled Up –100K
VIn Low<0.8V
Vin High>2V
0V –4.5V
2
I
N/A
Pulled Up –100K
3
I
N/A
Pulled Up –100K
4
I
N/A
Pulled Up –100K
5
I
N/A
Pulled Up –100K
6
O
SDA(I2C)
Pulled Up –5K
VIn Low<1.0V
Vin High>2.3V
0V –4.5V
7
I/O
SCL(I2C)
Pulled Up –5K
VIn Low<1.0V
Vin High>2.3V
8
I
Shut Down
Active High,
Pulled Down
VIn Low<0.7V
Vin High>2.0V
0V –5.0V
9
O
N/A
Vout Low <0.4
Vout High >2.5
I Out
Max 4mA
10
O
N/A
11
O
N/A
12
I
Reset
Active Low, Pulled
up 100K
VIn Low<0.7V
Vin High>2.0V
Alternative Power Connector (J6) Pin Definition
Pin
Function
Notes
Nominal Rating
Max Rating
1
Power GND
2
Vout
Connected to pin 4
4.75V-5.25V;
100 mAmp
0-7V
3
Vout Via 4.7Ohm
4
Vout
Connected to pin 2
4.75V-5.25V
100 mAmp
0-7V
5
NC
6
NC
Note: Pins 2 or 4 can be used as VIN to power the MT103, but the supply must be through
a Diode (0.5A)

Phoenix Audio Technologies, 16 Goodyear Suite 120, Irvine, CA 92618; Tel [phone]
Fax [phone]
www.phnxaudio.com
Modifying System Parameters Through the SDK
As mentioned in the Specification section, some of the MT103E-HD parameters can be controlled, modified, and
stored on the unit using a software setup utility which we refer to as the SDK.
The SDK is a graphic software utility, available for Windows operating systems that can be downloaded for free from
our website. The SDK communicates with the MT103E-HD through a standard USB link.
Once the settings have been modified using the SDK, the user can save the new settings onto the device (by clicking
Save). The parameters that can be modified with the SDK include:
Input level (mic / line / 6dB boost)
Phantom power supply (yes / no)
Output level (mic / line)
These parameters can be controlled by “double clicking” the specific icon (for example the input amplifier) or
through the software’s menu.
For additional information please refer to our website at www.phnxaudio.com.

Phoenix Audio Technologies, 16 Goodyear Suite 120, Irvine, CA 92618; Tel [phone]
Fax [phone]
www.phnxaudio.com
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