ISD1600 SERIES
PIN NAME
AGC
SOIC / PDIP
PIN NO.
12
FUNCTIONS
Automatic Gain Control:
The AGC dynamically adjusts the
gain of the preamplifier to compensate the wide range of
microphone input levels. The AGC allows the full range of
signal to be recorded with minimal distortion. Nominal
values of 4.7 µF give satisfactory results in most cases.
Connecting this pin to ground provides maximum gain to the
preamplifier circuitry. Conversely, connecting this pin to
power supply provides minimum gain to the preamplifier
circuitry.
AUD
13
AUD:
The AUD provides a single-ended current output to
drive an external amplifier. During standby or recording, this
pin is tri-stated.
Oscillator Resistor:
This enables the user to vary the
record and/or playback duration of the device. A resistor
connected between the R
OSC
pin and V
SS
determines the
sample frequency for the ISD1600 device. Please refer to
the Duration Section in Section 7.1.
LED
: This output is LOW during a record cycle and blinks
during playback cycle. It can be used to drive an LED to
indicate either a record or playback cycle is in progress.
R
OSC
14
LED
16
Note:
[1]
The REC and Play signal are internally debounced on the falling edge to prevent a false re-triggering
from a push-button switch.
[2]
The internal pull-up resistors are 600kΩ (typical).
-7-
Publication Release Date: November 4, 2004
Revision 1
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