ISD1700A SERIES
5 PIN DESCRIPTION
PIN NAME
V
CCD
PDIP
PIN NO.
1
FUNCTIONS
Digital Power Supply:
It is important to have a separate path for each
power signal including V
CCD
, V
CCA
and V
CCP
to minimize the noise
coupling. Decoupling capacitors should be as close to the device as
possible.
LED:
This output turns on a LED during a record cycle and blinks LED
during playback, forward and erase operations.
RESET:
When Low, the device enters into a known state and initializes all
pointers to the default state. This pin has an internal pull-up resistor
[1]
.
NC:
No Connect.
Test pin #1:
Connect to V
CCD
.
Test pin #2:
Connect to V
CCD
.
Test pin #3:
Connect to V
CCD
.
Analog Ground:
It is important to have a separate path for each ground
signal including V
SSA
, V
SSD
, V
SSP1
and V
SSP2
to minimize the noise
coupling.
AnaIn:
Auxiliary analog input to the device for recording or feed-through.
An AC-coupling capacitor (typical 0.1uF) is necessary and the amplitude
of the input signal should not exceed 1.0 Vpp.
MIC+:
Non-inverting input of the differential microphone signal. The input
signal should be AC-coupled to this pin via a series capacitor. The
capacitor value, together with an internal 10 KΩ resistance on this pin,
determines the low-frequency cutoff for the pass band filter.
MIC-:
Inverting input of the differential microphone signal. The input signal
should be AC-coupled to the MIC+ pin. It provides input noise-
cancellation, or common-mode rejection, when the microphone is
connected differentially to the device.
Ground for Negative PWM Speaker Driver:
It is important to have a
separate path for each ground signal including V
SSA
, V
SSD
, V
SSP1
and V
SSP2
to minimize the noise coupling.
SP-:
The negative Class D PWM provides a differential output with SP+
pin to directly drive an 8
Ω
speaker or typical buzzer. During power down
or recording, this pin is tri-stated.
Power Supply for PWM Speaker Driver:
It is important to have a
separate path for each power signal including V
CCD
, V
CCA
and V
CCP
to
minimize the noise coupling. Decoupling capacitors to V
SSP1
and V
SSP2
should be as close to the device as possible. The V
CCP
supply and V
SSP
ground pins have large transient currents and need low impedance
returns to the system supply and ground, respectively.
SP+:
The positive Class D PWM provides a differential output with the
SP- pin to directly drive an 8
Ω
speaker or typical buzzer. During power
down or recording, this pin is tri-stated.
LED
RESET
2
3
4
5
6
7
8
NC
TE1
TE2
TE3
V
SSA
AnaIn
9
MIC+
10
MIC-
11
V
SSP2
12
SP-
V
CCP
13
14
SP+
15
-8-
WINBOND [ WINBOND ]
