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ISD1700A データシート(PDF) 8 Page - Winbond

部品番号 ISD1700A
部品情報  Multi-Message Single-Chip Voice Record&Playback Devices
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メーカー  WINBOND [Winbond]
ホームページ  http://www.winbond.com
Logo WINBOND - Winbond

ISD1700A データシート(HTML) 8 Page - Winbond

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ISD1700A SERIES
- 8 -
5 PIN DESCRIPTION
PIN NAME
PDIP
PIN NO.
FUNCTIONS
VCCD
1
Digital Power Supply: It is important to have a separate path for each
power signal including VCCD, VCCA and VCCP to minimize the noise
coupling. Decoupling capacitors should be as close to the device as
possible.
LED
2
LED: This output turns on a LED during a record cycle and blinks LED
during playback, forward and erase operations.
RESET
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].
NC
4
NC: No Connect.
TE1
5
Test pin #1: Connect to VCCD.
TE2
6
Test pin #2: Connect to VCCD.
TE3
7
Test pin #3: Connect to VCCD.
VSSA
8
Analog Ground: It is important to have a separate path for each ground
signal including VSSA, VSSD, VSSP1 and VSSP2 to minimize the noise
coupling.
AnaIn
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.
MIC+
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.
MIC-
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.
VSSP2
12
Ground for Negative PWM Speaker Driver: It is important to have a
separate path for each ground signal including VSSA, VSSD, VSSP1 and VSSP2
to minimize the noise coupling.
SP-
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.
VCCP
14
Power Supply for PWM Speaker Driver: It is important to have a
separate path for each power signal including VCCD, VCCA and VCCP to
minimize the noise coupling. Decoupling capacitors to VSSP1 and VSSP2
should be as close to the device as possible. The VCCP supply and VSSP
ground pins have large transient currents and need low impedance
returns to the system supply and ground, respectively.
SP+
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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