MT9126
Pin Description
Pin #
19
20
21
Name
MS1
MS2
MS3
Mode Selects 1, 2 and
MS3 MS2 MS1
0
0
0
0
0
1
0
1
0
0
1
1
1
1
22
23
V
DD
ADPCMi
1
0
0
1
1
1
0
1
0
1
Description
Preliminary Information
3 (Inputs).
Mode selects for all four encoders.
MODE
32 kbit/s ADPCM
24 kbit/s ADPCM
16 kbit/s ADPCM in EN1/ENB1 when SEL=0
in EN2/ENB2 when SEL=1
ADPCM Bypass for 32 kbit/s and 24 kbit/s
ADPCM Bypass for 16 kbit/s
PCM Bypass (64 kbit/s) to PCM1 if SEL=0, PCM2 if SEL=1
Algorithm reset (ITU-T optional reset)
ADPCMo disable
Positive Power Supply.
Nominally 5 volts +/-10%
Serial ADPCM Stream ( Input).
128 kbit/s to 4096 kbit/s serial ADPCM word input
stream. Data bits are clocked in on falling edge of BCLK in SSI mode and clocked in on
the 3/4 bit edge of MCLK in ST-BUS mode.
Serial ADPCM Stream (Output).
128 kbit/s to 4096 kbit/s serial ADPCM word output
stream. Data bits are clocked out by rising edge of BCLK in SSI mode and clocked out by
MCLK divided by two in ST-BUS mode.
Mode Selects 4, 5 and
MS6 MS5 MS4
0
0
0
0
0
1
0
1
0
0
1
1
1
1
1
0
0
1
1
1
0
1
0
1
6 (Inputs).
Mode selects for all four decoders.
MODE
32 kbit/s ADPCM
24 kbit/s ADPCM
16 kbit/s ADPCM in EN1/ENB1 when SEL=0
in EN2/ENB2 when SEL=1
ADPCM Bypass for 32 kbit/s and 24 kbit/s
ADPCM Bypass for 16 kbit/s
PCM Bypass (64 kbit/s) to PCM1 if SEL=0, PCM2 if SEL=1
Algorithm reset (ITU-T optional reset)
PCMo1/2 disable
24
ADPCMo
25
26
27
MS4
MS5
MS6
28
EN2
Enable Strobe 2 (Output).
This 8 bit wide, active high strobe is active during the B2
PCM channel in ST-BUS mode. Forced to high impedance when LINEAR=1.
Notes:
All unused inputs should be connected to logic low or high unless otherwise stated. All outputs should be left open circuit when not used.
All inputs have TTL compatible logic levels except for MCLK which has CMOS compatible logic levels and PWRDN which has Schmitt
trigger compatible logic levels.
All outputs are CMOS with CMOS logic levels (See DC Electrical Characteristics).
8-36
MITEL [ MITEL NETWORKS CORPORATION ]
