ISD1700A Datasheet, PDF (8/31 Pages) Winbond – Multi-Message Single-Chip Voice Record&Playback Devices

ISD1700A SERIES
5 PIN DESCRIPTION
PIN NAME PDIP
PIN NO.
FUNCTIONS
V_CCD
LED
RESET
NC
TE1
TE2
TE3
V_SSA
AnaIn
MIC+
MIC-
V_SSP2
SP-
V_CCP
SP+
1
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.
2
LED: This output turns on a LED during a record cycle and blinks LED
during playback, forward and erase operations.
3
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].
4
NC: No Connect.
5
Test pin #1: Connect to V_CCD.
6
Test pin #2: Connect to V_CCD.
7
Test pin #3: Connect to V_CCD.
8
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.
9
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.
10
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.
11
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.
12
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.
13
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.
14
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.
15
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.
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