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TC1029EPA Datasheet(PDF) 4 Page - Microchip Technology |
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TC1029EPA Datasheet(HTML) 4 Page - Microchip Technology |
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4 / 14 page  TC1029 DS21340B-page 4 © 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1029 is one of a series of very low power, linear building block products for low voltage single supply operations. The TC1029 contains two rail to rail op amps which operate down to 1.8V with a maximum supply current of 16 µA. The amplifier's input range extends beyond both supplies by 200mV and the outputs will swing to within several millivolts of the supplies, depending on the load current being driven. The amplifier design is such that large signal gain, slew rate and bandwidth are largely independent of supply voltage. The low input bias current and offset voltage of the TC1029 make it suitable for precision applications. 4.0 TYPICAL APPLICATIONS The TC1029 lends itself to a wide variety of applications, particularly in battery powered systems. It typically finds application in power management, processor supervisory and interface circuitry. 4.1 Voice Band Receive Filter The majority of spectral energy for human voices is found to be in a 2.7kHz frequency band from 300Hz to 3kHz. To properly recover a voice signal in applications such as radios, cellular phones and voice pagers, a low power bandpass filter matched to the human voice spectrum can be implemented, using Microchip’s CMOS op amps. Figure 4-1 shows a unity gain multi- pole Butterworth filter with ripple less than 0.15dB in the human voice band. The lower 3 dB cut-off frequency is 70Hz (single order response), while the upper cut-off frequency is 3.5kHz (fourth order response). 4.2 Supervisory Audio Tone (SAT) Filter for Cellular Supervisory Audio Tones (SAT) provide a reliable transmission path between cellular subscriber units and base stations. The SAT tone functions much like the current/voltage used in land line telephone systems to indicate that a phone is off the hook. The SAT tone may be one of three frequencies: 5970, 6000 or 6030Hz. A loss of SAT implies that channel conditions are impaired and if SAT is interrupted for more than 5 seconds a cellular call is terminated. Figure 4-2 shows high Q (30) second order SAT detection bandpass filter using Microchip’s CMOS op amp architecture. This circuit nulls all frequencies except the three SAT tones of interest. |
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