MT9162AS datasheet(4/17 Pages) MITEL

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MT9162

Advance Information

7-164

Table 2: Bit Clock Rate Selection

TxMute pin is high. When either of these pins are low

their respective paths function normally. The -Zero

entry of Table 1 is used for the quiet code deﬁnition.

SSI Mode

The SSI BUS consists of input and output serial data

streams named Din and Dout respectively, a Clock

input signal (CLOCKin), and a framing strobe input

(STB). A 4.096 MHz master clock is also required for

SSI operation if the bit clock is less than 512 kHz.

The timing requirements for SSI are shown in

Figures 5 & 6.

In SSI mode the MT9162 supports only B-Channel

operation. Hence, in SSI mode transmit and receive

B-Channel data are always in the channel deﬁned by

the STB input.

The data strobe input STB determines the 8-bit

timeslot used by the device for both transmit and

receive data. This is an active high signal with an 8

kHz repetition rate.

SSI operation is separated into two categories based

upon the data rate of the available bit clock. If the bit

clock is 512 kHz or greater then it is used directly by

the internal MT9162 functions allowing synchronous

operation. If the available bit clock is 128 kHz or 256

kHz, then a 4096 kHz master clock is required to

derive clocks for the internal MT9162 functions.

Applications where Bit Clock (BCL) is below 512 kHz

are designated as asynchronous. The MT9162 will

re-align its internal clocks to allow operation when

the external master and bit clocks are asynchronous.

Control pins CSL2, CSL1 and CSL0 are used to

program the bit rates.

CSL2

CSL1

CSL0

External

Clock Bit

Rate (kHz)

CLOCKin

(kHz)

128

4096

256

4096

512

1536

2048

4096

Figure 3 - Audio Gain Partitioning

Serial

Port

Filter/Codec and Analog Interface

PCM

Receive

Filter Gain

0 dB

Receiver

Driver

-2.05 dB

Aout +

Aout-

20k

Ω

Internal To Device

External To Device

AIN+

AIN-

Transmit

Gain

8.42 dB

Transmit Gain

-0.37 dB

Transmit Filter

Gain

0 to +7 dB

(1 dB steps)

PCM

Analog

Input

Din

Dout

Transmit Filter

Gain

0dB

Decoder

Encoder

2.05 dB

-2.05 dB

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