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ISD1XXXA Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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ISD1XXXA Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
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5 / 20 page  Product Data Sheets ISD1000A Series 1–5 1 Analog Output (ANA OUT) This pin provides the preamplifier output to the user. The voltage gain of the preamplifier is deter- mined by the voltage level at the AGC pin. It has a maximum gain of about 24 dB for small input sig- nal levels. Analog Input (ANA IN) The analog input pin transfers its signal to the chip for recording. For microphone inputs, the ANA OUT pin should be connected via an external capacitor to the ANA IN pin. This capacitor value, together with the 2.7 K Ω 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 fed, capacitively coupled, into the ANA IN pin directly. Optional External Clock Input (XCLK) ISD1000A devices are configured at the factory with an internal sampling clock frequency cen- tered to ±1% of specification. The frequency is maintained to a total variation of ±2.25% toler- ance over the entire commercial temperature and 4.5 to 5.5 voltage ranges. The internal clock has a ±5% tolerance over the industrial temperature range and 4.5 to 5.5 voltage range. A regulated power supply is recommended for industrial-tem- perature-range parts. If greater precision is required, the device can be clocked through the XCLK pin as follows. These recommended clock rates should not be varied because the antialiasing and smoothing fil- ters are fixed, and aliasing problems can occur if the sample rate differs from the one recom- mended. The duty cycle on the input clock is not critical, as the clock is immediately divided by two. IF THE XCLK IS NOT USED , THIS INPUT MUST BE CONNECTED TO GROUND . Speaker Outputs (SP+/SP-) All devices in the ISD1000A Series include an on- chip differential speaker driver, capable of driving 50 milliwatts into 16 Ω from AUX IN (12.2 mW from memory). The speaker outputs are held at VSSA levels during record and power down. It is therefore not possi- ble to parallel speaker outputs of multiple ISD1000A devices or the outputs of other speaker drivers. NOTE Connection of speaker outputs in parallel may cause damage to the device. While a single output may be used alone (includ- ing a coupling capacitor between the SP pin and the speaker), these outputs may be used individ- ually with the output signal taken from either pin. Using the differential outputs results in a 4:1 improvement in output power. NOTE Never ground or drive an output. Auxiliary Input (AUX IN) The Auxiliary Input is multiplexed through to the output amplifier and speaker output pins when CE is HIGH and Playback has ended, or if the device is in overflow. When cascading multiple ISD1000A devices, the AUX IN pin is used to connect a Play- back signal from a following device to the previous output speaker drivers. For noise consid- erations, it is suggested that the Auxiliary Input not be driven when the storage array is active. Address/Mode Inputs (Ax/Mx) The Address/Mode Inputs provide two functions in the ISD1000A Series: 1. Message address (either Part Number Sample Rate Required Clock ISD1016A 8.0 KHz 1024 KHz ISD1020A 6.4 KHz 819.2 KHz 06.DataBook_1000A Dsht Page 5 Friday, September 27, 1996 10:44 AM |
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