ISD1112SR Nuvoton Technology Corporation of America, ISD1112SR Datasheet - Page 7

• Manufacturer Part Number: ISD1112SR
• Description: IC VOICE REC/PLAY 12-SEC 28-SOIC
• Manufacturer: Nuvoton Technology Corporation of America
• Series: ISD1100r

Specifications of ISD1112SR

• Interface: Pushbutton
• Filter Pass Band: 2.2kHz
• Duration: 12 Sec
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PLAYE
PLAYL
PIN NAME
ANA OUT
MIC REF
ANA IN
AGC
[2][3]
[2][3]
PIN NO.
18
19
20
21
23
24
Microphone Reference: The MIC REF input is the inverting
input to the microphone preamplifier. This provides a noise-
canceling or common-mode rejection input to the device when
connected to a differential microphone.
Automatic Gain Control (AGC): The AGC input dynamically
adjusts the gain of the preamplifier to compensate for the wide
range of microphone input levels. The AGC allows the full
range of sound, from whispers to loud sounds, to be recorded
with minimal distortion. The “attack” time is determined by the
time constant of a 5 KΩ internal resistance and an external
capacitor (C6 of Figure 5 in Section 11) connected from the
AGC pin to V
constant of an external resistor (R5) and an external capacitor
(C6) connected in parallel between the AGC pin and V
Nominal values of 470 KΩ and 4.7 µF give satisfactory results
in most cases. Tying this to ground gives maximum gain,
while tying it to V
amplifier.
Analog Input: The ANA IN transfers an input signal to the
chip for recording. For microphone usage, this ANA IN pin
should be connected via an external capacitor to the ANA
OUT pin. This capacitor value, together with the 3 KΩ input
impedance of ANA IN, is selected to give additional cutoff at
the low-frequency end of the voice passband. If the desired
input is derived from a source other than a microphone, the
signal can be capacitively coupled into the ANA IN pin directly.
Analog Output: This pin provides the preamplifier output to
the user. The voltage gain of the preamplifier is determined by
the voltage level at the AGC pin.
Playback, Level-Activated: When this input signal is held
LOW, a playback cycle is initiated, and playback continues
until PLAYL is pulled HIGH, or an EOM marker is detected.
The device automatically powers down and enters into
standby mode upon completion of a playback cycle. This pin
has an internal pull-up resistor.
Playback, Edge-Activated: When a LOW-going transition is
detected on this pin, a playback cycle begins. Taking PLAYE
HIGH during a playback cycle will not terminate the current
cycle. Playback continues until an EOM is encountered. Upon
completion of a playback cycle, the device automatically
powers down and enters into standby mode. This pin has an
internal pull-up device.
- 7 -
SSA
. The “release” time is determined by the time
CCA
gives minimum gain for the AGC
FUNCTION
Publication Release Date: April 21, 2005
ISD1100 SERIES
Revision 1.1
SSA
pin.