Preliminary Information
Pin Description (Continued)
Pin #
19
20
21
22
23
24
Name
SDi
V
Ref
Di
C2i
Do
F1i
Description
MH89626C
Serial Data in (input):
A TTL compatible digital input. The 8-bit serial input enables the
drivers. See Table 1 and Figure 3b.
Voltage Reference (Input)
+2.5V for the internal codec.
Data in (Input).
A TTL compatible digital input which accepts the 8-bit PCM word from the
incoming PCM bus.
Clock input (input).
A TTl compatible digital input which accepts the 2048 kHz clock.
Data Out (Output)
A three state TTL compatible digital output which drives the 8-bit PCM
word to the outgoing PCM bus.
Synchronization input (Input).
A TTL compatible, active low digital output input enabling
the PCM input, PCM output and digital control input. It is internally sampled on every
positive edge of the clock, C2i and provides frame and channel synchronization. See fig
3a.
Internal Connection
.
Gain setting (Input).
A logic ‘0’ at this input will set the receiving gain to -7.0dB and a logic
‘1’ will set the receiving gain to -3.5dB. If this pin is left open, the receiving gain can be set
by SDi, bit 2.
Internal Connection.
Serial Data (Output).
A TTL compatible output coming from the SDi, bit 7. Bit inverted.
Serial Data (Output).
A TTL compatible output coming from the SDi, bit 6. Bit inverted.
Serial Data (Output).
A TTL compatible output coming from the SDi, bit 5. Bit inverted.
Internal Connection.
Relay Positive Supply Voltage.
Normally +5V. Connects to the relay coil and the relay
supply voltage.
Relay Ground.
Return path for relay supply voltage.
Relay Driver 2 (Output).
Connects to a user provided external relay coil. A logic ‘0’
from the SDi, bit 1 will activate this driver. This relay driver is typically used for system
in-test.
Relay Driver 3 (Output).
Connects to a user provided external relay coil. A logic ‘0’
from the SDi, bit 4 will activate this driver. This relay driver is typically used for system
in-test.
Relay Driver 1 (Output).
Connects to a user provided external relay coil. A logic ‘0’ from
the SDi, bit 0 will activate this driver. This relay driver is typically used for ringing.
25-27
28
IC
GS
29
30
31
32
33
34
35
36
IC
SD7
SD6
SD5
IC
V
RLY
RGND
RD2
37
RD3
38
RD1
2-287
MITEL [ MITEL NETWORKS CORPORATION ]
