Phoenix Audio Technologies, 16 Goodyear Suite 120, Irvine, CA 92618; Tel (818) 937-4774
Fax (818) 859-1054
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(I
2
C)
Pulled Up
– 5K
VIn Low<1.0V
Vin High>2.3V
0V
– 4.5V
7
I/O
SCL(I
2
C)
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)
