參數(shù)資料
型號(hào)： ISD MicroTAD-16M
廠商： WINBOND ELECTRONICS CORP
英文描述： Single-Chip Voice Record/Playback Device（Single-chip Durations of 16 minutes)(單片的錄音/錄音重放器(單片信息存儲(chǔ)持續(xù)時(shí)間16分鐘）)
中文描述： 單芯片語(yǔ)音記錄/播放設(shè)備（單芯片的持續(xù)時(shí)間16分鐘）（單片的錄音/錄音重放器（單片信息存儲(chǔ)持續(xù)時(shí)間16分鐘））
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 650K
代理商： ISD MICROTAD-16M
ISD MicroTAD-16M
4
Voice Solutions in Silicon
ROW ADDRESS CLOCK (RAC)
This is an open drain output pin that provides a
signal with a 400 ms period at the 4 KHz sampling
frequency. (This represents a single row of memo-
ry and there are 2400 rows of memory in the ISD
MicroTAD-16M devices.) This signal stays HIGH for
350 ms and stays LOW for 50 ms when it reaches
the end of a row.
The RAC pin stays HIGH for 218.76
LOW for 31.26
μ
sec in Message Cueing mode
(see page 5 for a more detailed description of
Message Cueing). Refer to the AC Parameters
table for RAC timing information on other sam-
ple rate products.
μ
sec and stays
When a record command is first initiated, the
RAC pin remains HIGH for an extra T
This is due to the need to load sample and hold
circuits internal to the device. This pin can be
used for message management techniques.
RACLO
period.
EXTERNAL CLOCK INPUT (XCLK)
The external clock input for the ISD MicroTAD-
16M product has an internal pull-down device.
These products are configured at the factory
with an internal sampling clock frequency cen-
tered to ±1 percent of specification. The fre-
quency is then maintained to a variation over
the entire commercial temperature and oper-
ating voltage ranges as defined by the min-
imum/maximum limits in the applicable AC
Parameters table. The internal clock has a toler-
ance, over the extended temperature, industrial
temperature and voltage ranges as defined by
the minimum/maximum limits in the applicable
AC Parameters table. A regulated power supply
is recommended for industrial temperature
range parts. If greater precision is required, the
device can be clocked through the XCLK pin in
Table 1.
This recommended clock rate should not be var-
ied because the antialiasing and smoothing filters
are fixed. Thus, aliasing problems can occur if the
sample rate differs from the one recommended.
The duty cycle on the input clock is not critical,
as the clock is immediately divided by two inter-
nally.
If the XCLK is not used, this input should be
connected to ground.
AUTOMUTE FEATURE (AM CAP)
This pin is used in controlling the AutoMute fea-
ture. The AutoMute feature attenuates the signal
when it drops below an internally set threshold.
This helps to eliminate noise (with 6 dB of attenu-
ation) when there is no signal (i.e., during periods
of silence). A 1
μ
F capacitor to ground should be
connected to the AM CAP pin. This capacitor
becomes a part of an internal peak detector
which senses the signal amplitude (peak). This
peak level is compared to an internally set
threshold to determine the AutoMute trip point.
For large signals the AutoMute attenuation is set
to 0 dB while 6 dB of attenuation occurs for
silence. The 1
μ
F capacitor also affects the rate
at which the AutoMute feature changes with the
signal amplitude (or the attack time). The Auto-
mute feature can be disabled by connecting
the AM CAP pin to V
CCA
.
T
RAC
ROW (400 ms)
RAC
50 ms
T
RACLO
Table 1:
External Clock Input Clocking
Table
Part Number
Sample Rate
Required Clock
ISD MicroTAD-16M
4.0 KHz
512 KHz
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