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| 型號(hào)： | ISDMICROTAD-16M |
| 文件頁數(shù)： | 5/26頁 |
| 文件大?。?/td> | 1522K |
| 代理商： | ISDMICROTAD-16M |
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ISD MicroTAD-16M
3
ISD
NON-INVERTING ANALOG INPUT (ANA IN+)
This pin is the non-inverting analog input that trans-
fers the signal to the device for recording. The an-
alog input amplifier can be driven single ended or
differentially. In the single-ended input mode, a
32 mVp-p (peak-to-peak) maximum signal should
be capacitively connected to this pin for optimal
signal quality. This capacitor value, together with
the 3 K
input impedance of ANA IN+ , is selected
to give cutoff at the low frequency end of the
voice passband. In the differential-input mode,
the maximum input signal at ANA IN+ should be
16 mVp-p for optimal signal quality. The circuit
connections for the two modes are shown in Fig-
ure 2 on page 2.
INVERTING ANALOG INPUT (ANA IN–)
This pin is the inverting analog input that transfers
the signal to the device for recording in the differ-
ential-input mode. In this differential-input mode,
a 16 mVp-p maximum input signal at ANA IN–
should be capacitively coupled to this pin for op-
timal signal quality as shown in the ISD MicroTAD-
16M ANA IN Modes, Figure 2. This capacitor value
should be equal to the coupling capacitor used
on the ANA IN+ pin. The input impedance at ANA IN–
is nominally 56 K
. In the single-ended mode, ANA
IN– should be capacitively coupled to V
SSA
through a capacitor equal to that used on the
ANA IN+ input.
AUDIO OUTPUT (AUD OUT)
This pin provides the audio output to the user.
It is capable of driving a 5 K
impedance. It is
recommended that this pin be AC coupled.
NOTE
The AUDOUT pin is always at 1.2 volts when
the device is powered up. When in play-
back, the output buffer connected to this
pin can drive a load as small as 5 K
.
When in record, a resistor connects AUD-
OUT to the internal 1.2 volt analog ground
supply.
This
resistor
850 K
. This relatively high impedance
allows this pin to be connected to an
audio bus without loading it down.
is
approximately
SLAVE SELECT (SS)
This input, when LOW, will select the ISD MicroTAD-
16M device.
MASTER OUT SLAVE IN (MOSI)
This is the serial input to the ISD MicroTAD-16M de-
vice. The master microcontroller places data on
the MOSI line one half-cycle before the rising
clock edge to be clocked in by the ISD MicroTAD-
16M device.
MASTER IN SLAVE OUT (MISO)
This is the serial output of the ISD MicroTAD-16M
device. This output goes into a high-impedance
state if the device is not selected.
SERIAL CLOCK (SCLK)
This is the clock input to the ISD MicroTAD-16M. It is
generated by the master device (microcontroller)
and is used to synchronize data transfers in and
out of the device through the MISO and MOSI
lines. Data is latched into the ISD MicroTAD-16M
on the rising edge of SCLK and shifted out of the
device on the falling edge of SCLK.
INTERRUPT (INT)
The ISD MicroTAD-16M interrupt pin goes LOW and
stays LOW when an Overflow (OVF) or End of Mes-
sage (EOM) marker is detected. This is an open
drain output pin. Each operation that ends in an
EOM or Overflow will generate an interrupt includ-
ing the message cueing cycles. The interrupt will
be cleared the next time an SPI cycle is initiated.
The interrupt status can be read by an RINT instruc-
tion.
Overflow Flag (OVF)
—The Overflow flag indi-
cates that the end of the ISD MicroTAD-16M’s an-
alog memory has been reached during a record
or playback operation.
End of Message (EOM)
—The End-of-Message
flag is set only during playback operation when an
EOM is found. There are eight EOM flag position
options per row.
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