FEDL6722-05
OKI Semiconductor
MSM6722
PIN DESCRIPTIONS
Common to UP/DOWN Mode and BINARY Mode
Pin
24
20
12
18
16
14
15
13
10
11
9
8
Symbol
DV
DD
DGND
AV
DD
AGND
MIN
LIN
MOUT
LOUT
ADIN
FOUT
AOUT
DAO
Type
—
—
—
—
I
O
I
O
O
O
Description
Digital power supply pin. Insert a bypass capacitor of 0.1
mF
or more
between this pin and DGND.
Digital ground pin.
Analog power supply pin. Insert a bypass capacitor of 0.1mF or more
between this pin and AGND.
Analog ground pin.
Inverting input pins for the built-in OP amplifier. The non-inverting
input pin is connected internally to SG.
MOUT and LOUT are output pins of the built-in OP amplifier for MIN
and LIN respectively.
Input pin for the built-in 8-bit AD converter.
Output pin from the built-in LPF. Connect to ADIN Pin.
Output pin from built-in LPF. This pin is used to output speech signals
and to connect the amplifier for driving speaker.
Output pin from built-in 9-bit DA converter.
The IC enters the initial state when this pin is at the "L" level.
At this time, the oscillation stops and the DA converter output (DAO)
and audio output (AOUT) fall to the GND level. Then the IC returns to
21
RESET
I
the initial state. The IC has a built-in power-on-reset circuit.
For normal power-on reset operation, supply the power within 1 msec.
If power cannot be supplied within 1 msec, apply a
RESET
pulse after
the power is switched on.
Select pin for the pitch control or non-pitch control.
6
THR/CHG
I
With a "H" level input, the IC outputs a normal speech signal from the
AOUT pin through the built-in OP amplifier. With a "L" level input, the
IC outputs a pitch controlled speech signal from the AOUT pin.
7
23
22
19
17
TEST
XT
XT
SG
SGC
I
I
O
O
Test pin to be fixed to "L" level.
Crystal oscillator connecting pin. When using the external clock, use
this pin as the input.
Crystal oscillator connecting pin. When using the external clock, this
pin must be left OPEN.
These pins output the reference voltage (signal ground (SG)) of the
analog circuit. The output is approximately 1/2 the AV
DD
level.
4/21
OKI [ OKI ELECTRONIC COMPONETS ]
