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TC1030EQR 数据表(PDF) 5 Page - Microchip Technology |
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TC1030EQR 数据表(HTML) 5 Page - Microchip Technology |
5 / 14 page © 2002 Microchip Technology Inc. DS21341B-page 5 TC1030 3.0 DETAILED DESCRIPTION The TC1030 is one of a series of very low power, linear building block products targeted at low voltage, single supply applications. The TC1030 minimum operating voltage is 1.8V, and maximum supply current is only 32 µA (fully enabled). It combines four op amps in a single package. Microchip’s op amps are internally compensated to be unity-gain stable and have a typical gain bandwidth product of 90kHz with typical slew rates of 35V/msec. 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. Two shutdown mode pins are incorporated for easy adaptation to system power management schemes. In this state, the shutdown pins allow the user to power on one, two, three, or all four op amps (see Table 4-1). Pin SHDNB can be used to disable op amp B and pin SHDNC/D to disableopampsC andD. Opamp Ais always powered on regardless of the states of the shutdown pins. When both shutdown pins are low, the total quiescent current of the TC1030 is only 6 µA, typical. Input offset voltage is 500 µV max at 25°C with an input bias current of less than 100pA. This makes the TC1030 extremely suitable for precision, low power applications. 4.0 TYPICAL APPLICATIONS The TC1030 lends itself to a wide variety of applications, particularly in battery-powered systems. It typically finds application in power management, process 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 that is 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 3dB 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 a 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. TABLE 4-1: TC1030 SHUTDOWN POWER CONTROL LOGIC SHDNC/D SHDNB OP AMPS ENABLED OP AMPS DISABLED MAX. DEVICE SUPPLY CURRENT VIL VIL AB,C,D 10 µA VIL VIH A,B C,D 16 µA VIH VIL A,C,D B 24 µA VIH VIH A,B,C,D None 32 µA |
类似零件编号 - TC1030EQR |
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类似说明 - TC1030EQR |
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