MT9126AS Zarlink Semiconductor, MT9126AS Datasheet - Page 4

• Manufacturer Part Number: MT9126AS
• Description: Description = Quad Adpcm (G.726) Transcoder ;; Package Type = Pdip ;; No. Of Pins = 28
• Manufacturer: Zarlink Semiconductor

MT9126
Pin Description
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).
8-92
Pin #
19
20
21
22
23
24
25
26
27
28
ADPCMo
ADPCMi
Name
MS1
MS2
MS3
MS4
MS5
MS6
EN2
V
DD
Mode Selects 1, 2 and 3 (Inputs). Mode selects for all four encoders.
MS3
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 6 (Inputs). Mode selects for all four decoders.
MS6
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.
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
MS2
MS5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
MS1
MS4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
MODE
32 kbit/s ADPCM
24 kbit/s ADPCM
16 kbit/s ADPCM
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
MODE
32 kbit/s ADPCM
24 kbit/s ADPCM
16 kbit/s ADPCM
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
Description
in EN1/ENB1 when SEL=0
in EN1/ENB1 when SEL=0
in EN2/ENB2 when SEL=1
in EN2/ENB2 when SEL=1
Data Sheet