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ISD4004-16MX Datasheet(PDF) 7 Page - Winbond |
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ISD4004-16MX Datasheet(HTML) 7 Page - Winbond |
7 / 28 page ISD4004 Series 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 W 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 ISD4004 Series 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 W. 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 W 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 KW. When in record, a resistor connects AUD- OUT to the internal 1.2 volt analog ground supply. This resistor is approximately 850 KW, but will vary somewhat according to the sample rate of the device. This rel- atively high impedance allows this pin to be connected to an audio bus without loading it down. SLAVE SELECT (SS) This input, when LOW, will select the ISD4004 device. MASTER OUT SLAVE IN (MOSI) This is the serial input to the ISD4004 device. The master microcontroller places data on the MOSI line one half-cycle before the rising clock edge to be clocked in by the ISD4004 device. MASTER IN SLAVE OUT (MISO) This is the serial output of the ISD4004 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 ISD4004. It is generat- ed 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 ISD4004 on the rising edge of SCLK and shifted out of the device on the falling edge of SCLK. INTERRUPT (INT) The ISD4004 interrupt pin goes LOW and stays LOW when an Overflow (OVF) or End of Message (EOM) marker is detected. This is an open drain output pin. Each operation that ends in an EOM or Over- flow will generate an interrupt including the mes- sage cueing cycles. The interrupt will be cleared the next time an SPI cycle is initiated. The interrupt status can be read by an RINT instruction. Overflow Flag (OVF)—The Overflow flag indi- cates that the end of the ISD4004’s analog mem- ory 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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