ISD1200 SERIES
6. PIN DESCRIPTION
PIN NAME
A0-A7
PIN NO.
1-6, 9, 10
FUNCTION
Address Inputs:
The address inputs have two functions,
depending on the level of the two Most Significant Bits (MSB)
of the address (A6 and A7).
If either or both of the two MSBs are LOW, all inputs are
interpreted as address bits and are used as the start address
for the current record or playback cycle. The address pins are
inputs only and do not output internal address information as
the operation progresses. Address inputs are latched by the
falling edge of
PLAYE
,
PLAYL
, or
REC
.
If both A6 & A7 are HIGH, then the device is in special
operational modes. Please refer to operational modes section
for details.
V
SSA
, V
SSD
12, 13
Ground:
Similar to V
CCA
and V
CCD
, separate analog and digital
ground rails provide independent analog and digital ground
buses internally to minimize noise. These pins should be tied
together as close as possible to the device.
Speaker Outputs:
The differential SP+ and SP- pins are
designed to drive a 16Ω speaker and no coupling capacitor is
required. Conversely, with single-ended connection, a
coupling capacitor is needed between the SP pin and the
speaker. Besides, the output power is about a quarter of that
from differential output. The speaker outputs are in high-
impedance state during recording and at V
SSA
during power
down.
Supply Voltages:
Separate analog and digital power rails
provide power to internal analog and digital circuits
respectively to minimize internal noises. These power buses
are brought out to separate pads and should be tied together
as close to the supply source as possible. It is important that
the power supplies are decoupled as close to the device as
possible.
Microphone:
The microphone input transfers its signal to the
on-chip preamplifier. An on-chip Automatic Gain Control
(AGC) circuit controls the gain of this preamplifier from –15 to
24dB. An external microphone should be AC coupled to this
pin via a series capacitor. The capacitor value, together with
the internal 10 KΩ resistance on this pin, determines the low-
frequency cutoff for the device passband. See Winbond’s
Application Information for additional information on low-
frequency cutoff calculation.
SP+, SP-
14, 15
V
CCA
, V
CCD
16, 28
MIC
17
-6-
WINBOND [ WINBOND ]
